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Contents
1. NORMAL RADIO MICROCOMPUTER BACKGROUND FUNCTION ON TO OFF HOOK SWITCH TRANSITION YES ACTIVATE VOICE RECOGNITION ACTIVATE KEYPAD BACKLIGHT AND DISPLAY TIME FOR 6 SECS DEACTIVATE KEYPAD BACKLIGHT AND DISPLAY 838 DEACTIVATE MUTE FUNCTION 840 OFF TO ON HOOK SWITCH TRANSITION 810 TURN OFF VOICE RECOGNITION BACKLIGHT AND DISPLAY 1 8 U S Patent Dec 29 1992 Sheet 8 of 8 5 175 759 TURN OFF VOICE RECOGNITION TERMINATE CALL ON TO OFF HOOK SWITCH TRANSITION IN HANDS FREE ADAPTOR VOICE RECOGNITION ACTIVATED 828 CURRENTLY IN FREE SWITCH TO HANDS FREE MODE 832 YES SWITCH TO HANDSET MODE 5 175 759 1 COMMUNICATIONS DEVICE WITH MOVABLE ELEMENT CONTROL INTERFACE BACKGROUND OF THE INVENTION The present invention is generally related to a porta ble telephone apparatus and more particularly to a cellular portable radiotelephone utilizing a movable housing element to permit the user to answer and termi nate telephone calls and control various radiotelephone functions by opening or closing the movable element This invention is related to that disclosed and claimed in U S patent application Ser No 439 993 filed on Jun 27 1990 in behalf of Metroka et al Telephones having a rotary or pushbutton dial mech anism and other buttons integral to the h2. 3904404 3AV IS MI 5 aoe 5 e in em wm e gut 2 I Hr HI ISSNA 0 wo ik M yy 5 g gt us e RADIO MICROCOMPUTER 5 FIG 5 Sheet 4 of 8 5 175 759 Dec 29 1992 U S Patent 3311 8 cay 097 5 qaoo 2I 333005 30111933 YIMOd 1 3 ary NOILIN9I sna AuLinourg Viva 1081N02 899 957 01007 LINSNVUL SY olany 34 3238 u01VH3N39 Hold ONY ANY an EIE gt 1 209 3SION nee 9S 959 929 829 40193130 508 XNV8 31114 13 YOSSIIONdOYIIN A933N3 N 1 1 N 03 see 819 919 vi9 219 ANON3N 31914831 VOIDIA 029 A98U3N3 038015 U S Patent Dec 29 1992 Sheet 5 of 8 ANY KEY di e 60 INTO LOW MODE YES ENTER SLEEP STATE WAIT FOR INTERRUPT 716 718 1 7 5 175 759 U S Patent Dec 29 1992 Sheet 6 of 8 5 175 759 1 7 READ 5 STATE 722 724 DIFFERENT FROM LAST TIME NO FLIP 730 SEND CLOSED FLIP COMMAND TO RADIO MICROCOMPUTER SEND OPEN FLIP COMMAND TO RADIO MICROCOMPUTER NORMAL SLAVE 732 BACKGROUND FUNCTION U S Patent Dec 29 1992 Sheet 7 of 8 5 175 759
3. a call if the flip element is already open Upon completion of the telephone call the user may hang up the portable telephone go on hook by mov ing the flip element 104 into a stowed position that is rotated about the axis of hinges 112 and 114 so that the flip element 104 rests nearly against keypad 110 This action activates a hookswitch HKS which causes the telephone call to be terminated Depression of the end button or an equivalent operation by the voice recogni tion circuit without closing the flip element may also terminate the call Activation of the hookswitch occurs in the preferred embodiment when the angle between the body 102 and the flip element 104 equals approximately 45 The clos ing of the flip element 104 can best be perceived in FIG 2 The hookswitch in the preferred embodiment is lo cated between the flip element 104 and the body portion 102 and may be seen in the detail of FIG 3 A contact 302 consisting of a conventional conductive spring ma terial is disposed in hinge 114 of flip element 104 and rotates with the flip element 104 A printed circuit board element 304 is disposed in the body portion 102 in a position such that the contact 302 presses against the circuit board element 304 Metallization disposed on printed circuit board element 304 is positioned such that when the flip element 104 is opened to an angle of 45 an electrical connection is completed between the met allization throu
4. functions and an on hook to off hook transition occurs then the voice recognition circuitry is activated the keypad backlighting is activated the display is acti vated The flow continues to determination block 836 A test is made at 836 to determine whether the micro phone mute function is on If it is determined at 836 that the microphone is muted then flow proceeds to block 838 where the microphone is unmuted Thus if the microphone is in the muted state with the movable element 104 closed opening the movable element 104 will unmute the microphone from 838 flow returns to the normal background functions at 802 If it is determined at 836 that the microphone was not muted then flow proceeds to determination block 840 A test is made at 840 to determine whether the portable radiotelephone is currently ringing If it is determined at 840 that the portable rddiotelephone is not ringing indicating that there is no incoming call then the process flow returns to the normal background functions at 802 If it is determined at 840 that the radiotelephone is ringing then the process flow pro ceeds to block 842 where the incoming call is answered Thus if the portable radiotelephone is ringing while the movable flip element 104 is closed and the movable flip element 104 is opened the incoming call is answered From 842 flow returns to the normal background func tions at 802 Thus a portable radiotelephone having the capabilit
5. 52 When coupled to duplex hands free adaptor DHFA the portable radiotelephone is in the DHFA mode in which inter alia display 416 is not disabled when the portable radio telephone is inactive for a predetermined time Radio microcomputer 404 detects the presence of an external power source by monitoring an external power source signal from hands free vehicular adaptor circuit 450 The external power source signal is converted to a binary signal having a binary state indicating whether or not the external power source is present i e binary zero state external power source present 5 25 30 35 40 45 50 60 65 6 If portable telephone is the DHFA mode audio amplifiers 422 and 426 are disabled and the transmitter TX audio 421 and receiver RX audio 425 are routed to the handsfree circuitry of the handsfree vehicular adaptor circuit 450 for processing and coupling to the hands free microphone 454 and speaker 456 respec tively as shown in FIG 6B The portable cellular radiotelephone receives its power via the external power source connection which is the output of conventional voltage regulator 642 The voltage supplied by vehicle battery 452 is voltage regu lated and controlled by voltage regulator 642 Control circuitry 644 turns the regulator output on and off in response to signals from the vehicle ignition input at port 646 and data bus 415 Data bus 415 is used by the portable radiot
6. S 306 to the radio microprocessor 404 Communication between the slave microprocessor 502 and the radio microprocessor 404 is maintained on a data bus 415 This data bus 415 is coupled to the radio microcomputer 404 as shown in FIG 4 Other functions also share the data bus 415 including the voice recogni tion circuit 432 and the vehicular adaptor circuit 450 Assuming that the portable radiotelephone has been powered up and the flip element has been opened to enable the HKS a keypad 110 pushbutton activation by the portable radiotelephone user results in a communi cation between the slave microprocessor 502 and the radio microcomputer 404 via the bus 415 The slave microprocessor 502 in the preferred embodiment com municates that a closure has occurred between a partic ular row and a particular column corresponding to the key pressed by the user The radio microcomputer 404 may then take the appropriate action such as returning a digit instruction via bus 415 for the slave microproces sor 502 to cause the display 416 to illuminate or other wise display a character Thus the slave microproces sor 502 is commanded by the radio microprocessor 404 or the user in order to complete an assignment Referring now to FIG 6A there is illustrated a block diagram of a voice recognition circuit 432 which may 5 175 759 5 be utilized in the present invention When the voice recognition circuits are activated microphone audio from an ext
7. United States Patent Metroka et al AUT ANTON US005175759A 1 Patent Number 5 175 759 45 Date of Patent Dec 29 1992 54 COMMUNICATIONS DEVICE WITH MOVABLE ELEMENT CONTROL INTERFACE 76 Inventors Michael Metroka 730 Oakview Dr Algonquin Ill 60102 Robert Krolopp 6466 Cape Cod Ct Lisle Ill 60532 21 Appl No 439 983 22 Filed Nov 20 1989 51 Int CL5 anseres H04M 11 00 52 US CT renes 379 58 379 61 379 63 455 89 381 43 58 Field of Search 379 58 63 433 62 379 67 56 61 362 24 364 707 455 90 89 73 D14 138 340 825 44 825 825 36 371 66 381 43 40 110 41 56 References Cited U S PATENT DOCUMENTS D 300 742 4 1989 Soren et al D14 148 D 304 189 10 1989 Nagele et al 014 147 D 305 427 1 1990 Soren et al D14 138 3 476 886 11 1969 Ferrari et al 3 551 607 12 1970 Tommasi et al 3 962 571 6 1976 Brantingham 364 707 4 018 998 4 1977 Wagner 379 370 4 122 304 10 1978 Mallien 379 63 4 124 879 11 1978 Schoemer 362 24 4 471 493 9 1984 Schober 379 61 4 477 807 10 1984 Nakajima et al 340 825 44 4 680 787 6 1987 Marry 379 63 4 737 975 4 1988 Shafer 379 58 4 797 929 1 1989 Gerson et al 381 43 4 845 772 7 1989 Met
8. a Digital Hands Free Adapter for Personal Telephones 1989 Primary Examiner Curtis Kuntz Assistant Examiner William Cumming Attorney Agent or Firm Raymond A Jenski Rolland R Hackbart 57 ABSTRACT A portable radiotelephone with a keypad alphanumeric character display and hands free function is disclosed A movable flip element of the housing covers a keypad and other control buttons when in a closed on hook position and activates the illumination of the keypad enables the display and enables the hands free function when in an open off hook position The duration of keypad illumination and display activation are timed to reduce battery drain and the hands free function may be deactivated with a hookswitch flash 4 Claims 8 Drawing Sheets U S Patent Dec 29 1992 Sheet 1 of 8 5 175 759 Sheet 2 of 8 5 175 759 Dec 29 1992 U S Patent 4311 8 3121H3A oep 3A9311V8 cGy oly 440 NO TWNOIS 80 27 1311041 09 3994 05 Sto 43MOd 1102812 I 3014 0 967 91 4 19510 139350 33104 0304 1 JAVIS 90 115415 NOILINDO034 9 b oranv zev WVY QNY WOX YILNdNODOYIIN 5 olava vor olava cov FOLIA U S Patent Dec 29 1992 Sheet 3 of 8 5 175 759 0 ej gt AY1dSId ovn lt 85885855
9. ailable portable radiotelephones such as for example the PT Cellular Telephone available from Motorola Inc The MI CROTAC PT Cellular Telephone is described in fur ther detail in operators manual no 68P81150E49 pub lished by and available from Motorola C amp E Parts 1313 East Algonquin Road Schaumburg 60196 In the preferred embodiment two interconnected microcomputer systems are utilized to control the basic functions of the portable radiotelephone the radio mi crocomputer 404 and to control the keypad and display 5 25 30 35 40 45 50 55 60 65 4 functions the slave microcomputer 414 The slave microcomputer 414 is shown in more detail in the sche matic of FIG 5 The slave microcomputer 414 consists of a microprocessor 502 which in the preferred em bodiment is an 68 5 4 microprocessor which also has on board memory The basic function of the slave microprocessor is to provide interface to the user of the portable radiotelephone via keypad 110 display 416 and other buttons indicators and illumination backlighting The slave microprocessor 502 is coupled to a multi segment display 416 which in the preferred embodiment is a conventional LED eight digit display The slave microprocessor 502 is also coupled to a key pad matrix of buttons 110 which enables the portable radiotelephone user to input dial telephone numbers store and recal
10. andset portion have become commonplace in landline subscriber tele phone instruments This integral arrangement offers the telephone user the convenience of bringing the user interface mechanism and control buttons close to the user Radiotelephone operation such as that offered in cellular radiotelephone or in cordless telephone sets provide a mobility to the telephone user which landline telephone does not provide The absence of a cord and the small size of the portable radiotelephone unit ena bles the user to carry the unit essentially whereever the user goes Recent innovations have enabled voice rec ognition circuitry to be used with portable radiotele phones in order to provide the user the ability to dial and control the operation of a portable radiotelephone with the spoken voice Undesired operation of voice recognition circuitry in a radiotelephone setting how ever may turn the equipment on or off cause transmis sion of unwanted signals and prevent use of a radio channel or cause undesired functions to occur Such undesired activation of voice recognition is likely to engage functions which reduce the operating life of the battery which powers the portable radiotelephone Additional drain upon the battery of the radiotele phone is made by the apparatus providing illumination for the dial keypad and number display Previously in order to activate the portable telephone s display back lighting or hands free function t
11. de couplable hands free apparatus to the portable unit and means responsive to said first means for detecting and said second means for detecting for activating the decouplable hands free apparatus 2 A radiotelephone apparatus in accordance with claim 1 further comprising means for deactivating an activated decouplable hands free apparatus when said first means for detecting detects a second occurrence of said on hook signal and a subsequent off hook signal within a predetermined period of time 3 A method of control of a decouplable hands free apparatus in a radiotelephone apparatus including a portable unit with a movable housing element having an extended position and a contracted position the method comprising the steps of producing an off hook signal in the portable unit when the movable housing element is placed in the extended position producing an on hook signal in the portable unit when the movable housing element has been _ placed in the contracted position detecting an occurrence of said on hook signal and a subsequent off hook signal within a predetermined period of time detecting a coupling of the decouplable hands free apparatus to the portable unit and activating the decouplable hands free apparatus in response to said detection of said on hook signal and subsequent off hook signal within a predeter mined period of time and said detection of the coupling of the decouplable hands free apparatus to th
12. e portable unit 4 A method in accordance with claim 3 further com prising the step of deactivating an activated decouplable hands free apparatus in response to detection of a sec ond occurrence of said on hook signal and a subsequent off hook signal within a predetermined period of time
13. elephone call with the hands free circuit disabled the momentary closure and reopening of the movable flip element results in the activation of the hands free circuit If the portable radiotelephone is not coupled to the hands free vehicular adaptor 450 and is presently in a call with the microphone not muted where the movable element is momentarily closed and then reopened prior to the timer expiring then either the voice recognition circuit is disabled or a hookswitch flash signal is sent From 826 flow returns to the normal background functions at 802 If a determination is made at 823 that the telephone was in the hands free vehicular adaptor then the pro cess flow continues to determination block 828 A test is made at 828 to determine whether the telephone is currently in the hands free speakerphone mode If it is determined at 828 that the telephone is not in the hands free speakerphone mode then the process flow proceeds to block 830 where the mode is set to the hands free mode In the hands free mode the internal microphone 420 and speaker 424 are inactivated and the external microphone 454 and external speaker 456 are active Thus if the portable radiotelephone is in the hands free vehicle adaptor 450 and is presently in a call with the microphone not muted while the movable element is momentarily closed and then re opened prior to the timer expiring but is not in the hands free mode at the time then the
14. elephone to sense if a hands free adaptor 450 is plugged into the portable radiotelephone Re ceiver audio signal 425 from the portable radiotele phone is coupled to amplifier 648 in hands free adaptor 450 to boost the level to drive speaker 456 The output from microphone 454 is connected to the portable ra diotelephone via TX audio connection 421 Illumination for the keypad 110 is provided in the preferred embodiment by a plurality of light emitting diodes LEDs indicated by diodes 536 541 in FIG 5 LEDs 536 541 are conventionally supplied from bat tery via current limiting resistors and switch transistor 543 Switch transistor 543 is coupled to the TCMP port of slave microprocessor 502 and is enabled disabled in accordance with the stored program of slave micro processor 502 The LEDs are physically mounted be hind the keypad 110 shown in FIG 1 and provide a backlighting to the keys to aid the user in selecting keys in dim lighting conditions Although the preferred embodiment has been imple mented employing two microprocessors this should not be a limitation of the invention for it is possible to implement the present invention in a single micro processor should the designer so desire For either a single microprocessor or a multiple microprocessor system the microprocessors may be interrupt driven in order to save battery power Referring now to FIGS 7A and 7B processes fol lowed by the slave microcomputer 502 in realiz
15. ernal microphone 454 is coupled to amplifier 610 where the gain is increased to an appropriate input level for the A D converter 612 The A D converter 612 digitizes the amplified analog input signal from amplifier 610 The digitized signal from A D converter 612 is fed to a filter bank 614 comprised of n bandpass filters whose responses overlap at the 3dB response points The output from each of the filter bank channels is fed to an n channel energy detector 616 where the amplitude of the signal in each bandpass response is detected The detected level from each energy detector at 616 is fed to conventional microprocessor 618 for comparison with a stored energy template from mem ory 620 Upon successful correlation of the microphone input with the stored template microprocessor 618 sends a command on the data bus 415 to the radio mi croprocessor 404 this manner a spoken command such as a telephone number to be dialed or a send or end command may be entered to control radiotele phone operation Synthesized voice replies from the voice recognition circuits are initiated by microproces sor 618 by sending control signals to a random noise generator and pitch generator circuit 622 Signals from these generators fed to an n channel filter bank 624 which comprises n narrow bandpass filters The out put of these filters are added together in a summer block 626 whose output is then fed to a D A conver
16. gh the contact 302 to ground In the preferred embodiment the combination of the contact 302 and the printed circuit board element 304 is the hookswitch HKS 306 Referring to FIG 4 there is illustrated an electrical block diagram of a cellular portable radiotelephone embodying the present invention Such a portable ra diotelephone includes a cellular radiotelephone trans ceiver 402 operable in cellular radiotelephone systems internal microphone 420 and switchable amplifier 422 internal speaker 424 and switchable amplifier 426 radio microcomputer 404 with conventional RAM storing pertinent cellular telephone call parameters and con ventional ROM storing control software a power controller 410 including regulators coupled to battery 430 for generating DC voltages for powering other blocks and coupled to on off switch 408 a slave mi crocomputer 414 including conventional ROM with control software for controlling display 416 and keypad 110 a voice recognition circuit 432 and a vehicular adaptor hands free circuit 450 Radio microcomputer 404 slave microcomputer 414 voice recognition circuit 432 and vehicular adaptor hands free circuit 450 are coupled to and communicate with one another by way of a three wire data bus 415 which operates as de scribed in U S Pat Nos 4 369 516 and 4 616 314 incor porated herein by reference The foregoing transceiver and microcomputer blocks may be conventional blocks of commercially av
17. he user would have to press a button which would initiate a function digit etc The user would then have to press a clear button to delete this function or digit Such an operation provides an unwanted opportunity for error and may for exam ple have enabled the user to inadvertently erase the contents of the scratch pad used for dialing a call A user having experienced an undesired operation caused by an inappropriate press of a clear button quickly becomes discouraged from using the otherwise useful illumination feature SUMMARY OF THE INVENTION The present invention overcomes these problems by using the hookswitch in the movable flip element to activate the alphanumeric character display backlight ing and hands free function Accordingly it is one object of the present invention to provide a portable radiotelephone which utilizes a movable flip element to place the portable radiotele phone in an on hook or an off hook condition It is another object of the present invention to pro vide a portable radiotelephone which utilizes a mov 15 20 50 55 60 65 2 able flip element to control the illumination of the key pad It is a further object of the present invention to pro vide a portable radiotelephone which utilizes a movable flip element to control the activation and deactivation of the hands free function It is a further object of the present invention to time the duration of the keypad i
18. in an open position such that a user of the portable unit may listen via earpiece 106 and may speak into the microphone 107 The dial or keypad 110 consists of a plurality of buttons numbered one through zero and in a familiar telephone arrangement as well as addi tional function buttons such as send end clear on off and other buttons associated with memory recall Volume control buttons not shown may adjust the volume of the earpiece and or the ringer An alpha numeric display 115 is disposed above the keypad 110 Operation of such a portable radiotelephone and flip element has been described in U S Pat No 4 845 772 assigned to the assignee of the present invention When the flip element 104 is open as shown in FIG 1 the portable cellular telephone can be in the state of answering or making a telephone call Such a state is commonly known as off hook It should be noted that in a cellular preorigination dialing system an addi tional operator activity is required to place a call upon entering a telephone number to be dialed either via the keypad 110 or by recognition of digits or names by a voice recognition circuit the send button must be de pressed in order to activate the portable unit s transmit ter and to complete the call In the preferred embodi 5 175 759 3 ment the send button may also be electronically acti vated by the voice recognition circuit and can be used to answer
19. ing the present invention are illustrated in flowchart form The process of FIG 7A therefore commences with an interrupt due to a change of state of the hookswitch 306 to enable the microcomputer system at 702 A determi nation is made at 704 whether the flip element is open or closed If the flip element is open then the keypad 110 is read to determine which key has been closed at 706 If a key has been depressed at 708 then the func tion or character designated by the key is acted upon at 710 If a keypad 110 key has not been depressed then no action is taken and the microcomputer system resumes its normal functions of controlling the transceiver the display and other housekeeping chores as shown at 712 If it is determined that the flip element is not open at 704 then any keypad key depression is considered to be spurious and is ignored by progressing directly from the determination block at 704 to the normal housekeep ing functions block at 712 The entire process is re peated for a predetermined period of time until a deter mination is made that the microcomputer system should go into a low power consumption mode as determined at 714 The microcomputer system is put into a sleep state at 716 and only the low power functions await for an interrupt signal at 718 5 175 759 7 If the microcomputer system is implemented as a radio microcomputer and a slave microcomputer the slave microprocessor 502 can send either a fli
20. l either the timer expires or an on hook to off hook tran sition occurs If a determination is made at 822 that an on hook to off hook transition has occurred prior to the timer expiring then flow proceeds to determination block 823 A test is made at 823 of whether the tele phone is coupled to the hands free vehicular adaptor circuit 450 One such vehicular adaptor circuit which may be employed by the present invention is a 51757 available from Motorola Inc If the telephone is not coupled to the vehicular adaptor 450 then flow pro ceeds to a decision block 824 where a determination of whether the voice recognition circuit has been enabled If the voice recognition circuit has been enabled it 5 then disabled at block 825 before the process returns to the normal background functions at 802 If the voice recognition circuit is not enabled at this time then the process proceeds to block 826 where a hookswitch flash signal is sent Thus if the portable radiotelephone is coupled to the hands free vehicular adaptor 450 and is engaged in a telephone call when the hands free circuit of the vehicular adaptor is enabled the momentary closure and reopening of the movable flip element in less than msec deactivates the hands free function and the portable radiotelephone reverts to the use of the internal microphone and speaker Likewise if the porta ble radiotelephone is coupled to the hands free adapter 450 and engaged in a t
21. l telephone number information and perform other radiotelephone functions such as initiate a telephone call In the preferred embodiment one of the keys 508 of the matrix 110 is specially dedicated to the function of turning the power on and off Power on off is accomplished by a momentary switch closure by key 508 to ground which activates on off circuitry Volume increase switch 509 and volume decrease switch 511 are electrically coupled to the slave micro processor 502 as part of the row column matrix Their physical location is away from the keypad 110 to allow for greater user convenience The function which is normally performed by a hook switch HKS in a conventional landline telephone is performed in the portable radiotelephone of the present invention as previously described in relation to FIG 3 The hookswitch is shown schematically as switch 306 in FIG 5 A DC Direct Current circuit is made or bro ken by HKS 306 to ground and applied to microproces sor 502 Furthermore a pulse is generated from any change of state of the HKS 306 by a transistor 510 capacitors 512 and 514 and resistors 516 518 and 519 The output of transistor 510 is taken from the collector and applied to the interrupt request IRQ input and the keypad column inputs of microprocessor 502 having a negative duration of approximately 10 microseconds Microprocessor 502 stores the status of HKS 306 and provides an indication of the change of state of HK
22. llumination and display activation in order to conserve battery power BRIEF DESCRIPTION OF THE DRAWINGS FIG 1 is an isometric drawing of a portable radiotele phone which may employ the present invention FIG 2 is a side view of the portable radiotelephone of FIG 1 depicting operation of the movable flip ele ment FIG 3 is a diagram of the hookswitch switch mecha nism which may be employed in the radiotelephone of FIG 1 FIG 4 is a block diagram of the electronic elements of a portable radiotelephone embodying the present invention FIG 5 is a schematic diagram of the slave microcom puter and associated circuitry employed in the portable radiotelephone of FIG 4 FIGS 6A and 6B are block diagrams of the voice recognition circuitry and vehicular adaptor hands free circuitry employed in the portable radiotelephone of FIG 4 FIGS 7A and 7B are a flowchart depicting the pro cess of hookswitch operation of the slave microproces sor FIGS 8A and 8B are a flowchart depicting a process of interpreting hookswitch operation of the master mi croprocessor DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A portable radiotelephone adapted to be used in a cellular radiotelephone system is shown in FIG 1 This portable unit consists of two readily apparent portions a body portion 102 and a flip element portion 104 The drawing of FIG 1 shows the flip element portion 104 The drawing of FIG 1 shows the flip element 104
23. mode is changed from a private call 5 175 759 9 with the radiotelephone s internal microphone and speaker to the hands free speakerphone mode using the external microphone and speaker From 830 flow re turns to the normal background functions at 802 If it is determined at 828 that the portable radiotelephone was in the hands free speakerphone mode then the flow proceeds to block 832 where the mode is changed from the hands free speakerphone mode to a private call using the radiotelephone s internal microphone and speaker Thus if the portable radiotelephone is in the hands free vehicular adaptor 450 and is presently in a call with either microphone not muted while the mov able flip element 104 is momentarily closed and then reopened prior to the timer expiring and the radiotele phone is in the hands free mode at the time then the mode is changed from the hands free speakerphone mode to that of a private call using the radiotelephone s internal microphone 420 and speaker 424 From 832 flow returns to the normal background functions at 802 If it is determined at 804 that an on hook to off hook transition occurred then the flow proceeds to block 834 where the voice recognition circuitry 432 is activated The process then at 835 activates the keypad back lighting illumination and the display 416 for a conven tionally timed period of six seconds Thus if the radio microcomputer 404 is performing normal background
24. nition circuitry is disabled Thus when the movable element 104 is closed while a call is in progress and the micro phone is muted the voice recognition circuitry is dis abled Flow proceeds from block 814 to 802 where flow returns to the normal background functions If it is determined at 812 that the microphone is not muted then flow proceeds to block 816 where a timer of n milliseconds is started This timer runs until it has either expired or the movable flip element is reopened After the counter is started flow proceeds to determination block 818 where a test is made to determine whether the 10 20 25 30 35 40 45 50 55 60 65 8 timer has expired If the timer has expired then the flow proceeds to block 820 where the telephone call is termi nated Thus if the movable element is closed for longer than n milliseconds while a call is in progress and the microphone is not muted then the call is terminated In the preferred embodiment the timer duration n is 1000 milliseconds Flow proceeds from block 820 to 802 where flow returns to the normal background func tions If it is determined at 818 that the timer has not expired then flow proceeds to determination block 822 where a test is made of whether an on hook to off hook transition has occurred If no on hook to off hook tran sition has occurred then flow returns to determination block 818 Flow continues in the 818 822 loop unti
25. p element closed indication or a flip open indication to the radio microcomputer a detection of those indications is nec essary by the radio microcomputer The slave micro processor 502 determines as part of its routine of chores whether the hookswitch has changed state by comparing the current state against the stored state 722 and 724 of FIG 7B If the state is different then a deter mination is made at 726 whether the flip element is open or closed If the flip element is determined to be open then an open flip element command is transmitted to the radio microcomputer at 728 If the determination at 726 yields a closed flip element then a closed flip element command is conveyed to the radio microcom puter at 730 and the slave microprocessor returns to its normal background functions at 732 In either case the radio microcomputer 404 maintains the flip element state in its associated storage and the slave microproces sor 502 as part of its routine of chores checks for a keypad enable or a keypad disable command received from the radio microcomputer 404 Thus if the flip element is determined to be open then the keys of the keypad are read in conventional fashion If the flip element is determined to be closed then the keys of the keypad are ignored The process followed by the radio microcomputer 404 in realizing the present invention in the preferred embodiment is shown in FIGS 8A and 8B The radio microprocessor 404 as pa
26. roka et al 379 61 4 870 686 9 1989 Gerson et al 381 43 4 893 348 1 1990 Andoh 455 89 4 896 36 1 1990 Gerson 381 40 4 897 873 1 1990 Beutler et al 379 433 4 933 963 6 1990 Sato et al 379 58 4 945 570 7 1990 Gerson 381 110 4 959 850 9 1990 Marui 379 58 4 961 212 10 1990 Marui et al 379 67 5 023 911 6 1991 Gerson 381 43 5 033 109 7 1991 Kawano et al 455 90 5 048 117 9 1991 Aisaka et al 455 89 5 054 115 10 1991 Sawa et al 455 89 FOREIGN PATENT DOCUMENTS 9010340 9 1990 PCT Intl Appl 379 58 OTHER PUBLICATIONS Motorola V S P Hands Free Operation Board 68P81048E93 A Jun 15 1983 Motorola 6000X 1984 Systcoms Systcoms Classic Series Telephony Jan 28 1990 Realistic Owner s Manual Duofone ET 415 Cordless Electronic Telephone Cat 43 444 1984 Motorola Inc User s Manual 68P81121E820 Digital Voice Caller Sep 1988 Motorola Inc Manual 68P81115E38 D VSP Hand s Free Optics Model T3754 Series Nov 5 1985 Motorola Inc Manual 68P81117E63 O VSP II Hands Free Option Model No T944 Series Nov 8 1965 Panasonic KX T300 Easa Phone Cordless Phone FCC Transmitter Type Acceptance Filing Exhibits B E F Telecommunications Mar 1990 Motorola Advertise ment Motorola Digital Hands Free Adapter Accessory 1990 Motorol
27. rt of its routine of chores at 802 checks for a on hook to off hook transition at 804 If an on hook to off hook transition has not occurred then flow proceeds to determination block 806 where a test is made to determine if an off hook to on hook transition has occurred If none has occurred then flow returns to the normal background functions at 802 If it is determined that an off hook to on hook transition has occurred at 806 indicating that the movable element 104 is in the closed position then flow proceeds to determi nation block 808 where a test is made to determine if a telephone call is presently in progress If it is deter mined that a call is not presently in progress then flow proceeds to 810 where the voice recognition circuitry is disabled the backlighting is inactivated and the display is inactivated Thus if the movable flip element 104 is closed while a call is not in progress then the voice recognition circuitry the backlighting and the display are inactivated Optionally the display may remain activated for a period of six seconds before being deacti vated by such a off hook to on hook transition From 810 flow returns to the normal background functions at 802 If a determination is made that a call was in progress at 808 then flow proceeds to determination block 812 A test is made at 812 of whether the micro phone mute function is on If the microphone is muted then flow proceeds to 814 where the voice recog
28. ter 628 where the digital signal is converted to an analog signal This analog signal is amplified to an appropriate level with amplifier 630 and sent to the RX audio path 425 which is then sent to the external speaker 456 so that the user will hear the synthesized voice responses The voice recognition circuits may be activated and deacti vated by the radio microprocessor 404 by sending com mands to the voice recognition microprocessor 618 over the data bus 415 Similar voice recognition circuits are further disclosed in U S Pat Nos 4 797 929 4 817 157 and 4 870 686 U S patent application Ser Nos 266 293 Word Spotting in a Speech Recognition System Without Predetermined Endpoint Detection filed on behalf of Gerson on Oct 31 1988 now 0 5 Pat Nos 5 023 911 294 098 Digital Speech Coder Having Improved Vector Excitation Source filed on behalf of Gerson on Jan 6 1989 now U S Pat Nos 4 896 361 and 399 341 Method for Terminating a Telephone Call by Voice Command filed on behalf of Gerson et al on Aug 25 1989 now U S Pat No 4 945 570and International Publication Nos WO 87 07748 and WO 87 07749 Dec 17 1987 Referring to FIG 6B there is shown a block diagram of a hands free vehicular adaptor circuit which may be employed in the present invention The hands free ve hicular adaptor 450 may be a hands free adaptor with regulated power supply which couples the portable radiotelephone to a vehicle battery 4
29. y of enabling and disabling hands free circuitry and en abling and disabling number display and keypad illumi nation in response to the position of a flip element has been shown and described A flip element which covers a keypad and other control buttons when in a closed position also activates a hookswitch While a particular embodiment of the invention has been shown and de scribed it is to be understood that the invention is not to 25 35 40 45 50 55 60 65 10 be taken as limited to the specific embodiment herein and that changes and modifications may be made with out departing from the true spirit of the invention It is contemplated therefore to cover the present invention and any and all such changes and modifications by the appended claims We claim 1 A radiotelephone apparatus having a portable unit with a movable housing element having an extended position and a contracted position and a decouplable hands free apparatus the radiotelephone apparatus comprising means for producing an off hook signal in the porta ble unit when the movable housing element is placed in the extended position and for producing an on hook signal in the portable unit when the movable housing element has been placed in the contracted position first means for detecting an occurrence of said on hook signal and a subsequent off hook signal within a predetermined period of time second means for detecting a coupling of the
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