APR9600 user manual
Contents
1. Replay E Record MSEL2 1 E MSEL2 0 APR9600 MSEL1 1 E MSEL1 0 M8 1 m M8 0 Speaker and power supply Microphone Busy LED saara oo usy peaker an Speaker power supply Ground 5V Figure 3 APR9600 module with connector details to record in parallel mode the switch setting should be same as displayed above To record the top switch should be on the right hand side To replay the top switch should be on the left 3 Using the APR9600 module 3 1 Parallel mode recording and replaying Record sound tracks This is an example of recording 8 sound tracks The mode switch should have the following pattern MSEL1 1 switched to left hand side of the mode selection switch MSEL2 1 left hand side M8 1 left hand side RE 0 right hand side The maximum length of the 8 tracks is 7 5 seconds Press M1 continuously and you will see BUZY LED illuminates You can now speak to the microphone Recording will terminate if M1 is released or if the recording time exceeds 7 5 seconds Similarly press M2 to M8 to record other sound tracks Intec Associates Ltd INTEC DATA SHEETS APR9600 sound recording module Replay sound tracks Now make RE 1 switched to Left hand side of the mode selection switch while keep other switches at the same location Toggle M1 to M8 press key and release causes a particular sound track to replay once While the sound is playing press the same key again or press CE key will terminat2. replaying current consumption is 25 mA In idle mode the current drops to 1 uA Table 1 Pin functions of the APR9600 Name Functions Pin Mane Functions Select 1 section of sound or serial 15 mode recording and replaying control low active Select 2 section or fast forward control in serial mode low active 1 M1 SP Speaker negative end Analogue circuit power supply Select 3 section of sound 4 M4 Select 4 section of sound gt M5_ Select 5 section of sound Select 6 section of sound Microphone input electret type microphone AGC AGC control ANA IN Audio input accept a signal of 100 mV p to p Resistor to set clock frequency See Table 3 for details ANA OUT Audio output from the microphone amplifier 8 M7 Select 7 section of sound or IC 22 STROBE During recording and overflow indication replaying it produces a strobe signal 9 M8 Select 8 section of sound or select 23 CE Reset sound track counter to mode see Table 2 zero Stop or Start Stop 1 beep when a key is pressed MSEL2 Mode selection 2 see Table 2 0 do not beep 12 VSSD Digital circuit ground 26 EXTCLK External clock input 13 VSSA Analogue circuit ground 27 RE 0 to record 1 to replay 14 SP Speaker positive end 28 VCCD Digital circuit power supply During sound replaying the IC s control circuit reads analogue data from flash RAMs The signal then passes
3. through a low pass filter a power amplifier and output to an 8 to 16 Ohm speaker There are different sound recording and replaying modes see Table 2 These modes are selected using MSEL1 Pin 24 MSEL2 Pin 25 and M8 Pin 9 M1 to M7 keys have different functions in different modes Intec Associates Ltd INTEC DATA SHEETS APR9600 sound recording module Table 2 Modes and selection of modes MSELI MSEL Function Keys Functions M or M1 M2 to select 1 and 2 Parallel mode 2 sections 30 seconds for each sound tracks CE to stop 1 0 Oor1 M1 to M4 to select a sound Parallel mode 4 sections 15 seconds for each track CE to stop 1 1 1 M1 to M 8 to select a sound Parallel mode 8 sections 7 5 seconds for each track CE to stop M1 to M8 to select a sound track CE to stop Pressing and hold down a key from M1 to M8 to play the selected sound track repeatedly M1 and CE Serial mode allow up to 256 sound tracks to be recorded and played Sound tracks are played from 1 to N in order after M1 is toggled Press CE to play from the 1 sound track Notes e RE 0 to record sound RE 1 to replay sound e Press M1 to M8 once to replay a sound track Press the key again to stop replaying the track e Press and hold M1 to M8 continuously the corresponding track will be replayed repeatedly e During recording M1 to M8 should be pressed while the sound is being re
4. INTEC DATA SHEETS APR9600 sound recording module APR9600 multi section sound recorder replay IC and experimental board APR9600 is a low cost high performance sound record replay IC incorporating flash analogue storage technique Recorded sound is retained even after power supply is removed from the module The replayed sound exhibits high quality with a low noise level Sampling rate for a 60 second recording period is 4 2 kHz that gives a sound record replay bandwidth of 20Hz to 2 1 kHz However by changing an oscillation resistor a sampling rate as high as 8 0 kHz can be achieved This shortens the total length of sound recording to 32 seconds Total sound recording time can be varied from 32 seconds to 60 seconds by changing the value of a single resistor The IC can operate in one of two modes serial mode and parallel mode In serial access mode sound can be recorded in 256 sections In parallel access mode sound can be recorded in 2 4 or 8 sections The IC can be controlled simply using push button keys It is also possible to control the IC using external digital circuitry such as micro controllers and computers The APR9600 has a 28 pin DIP package Supply voltage is between 4 5V to 6 5V During recording and replaying current consumption is 25 mA In idle mode the current drops to 1 WA The APR9600 experimental board is an assembled PCB board consisting of an APR9600 IC an electret microphone support components and necessar
5. corded Releasing the key terminates recording RI R2 R3 R4 t5V vce 100K 4 RE 0 REC AP RE 1 PLAY ale RI600 z p wie ttt MSELI ei ci ae at dg bare O 1uF ANA OUT Mi sm M2 m2 c2 470K j RI2 M3 m ie M4 MA a MS ome are E 4 70F M6 w M6 a RIO M7 a imap c3 MICIN 4 1K ca E MICREF 5V R6 MLC CE 100x O iuF 2 ait 4 7K RS 1K FP Li ome SP ome STROBE et ae OSCR 8 16 EXTCLK Figure 2 Typical connections of the APR9600 Intec Associates Ltd INTEC DATA SHEETS APR9600 sound recording module 2 APR9600 module The circuit diagram of the module is shown in Figure 2 The module consists of an APR9600 chip an electret microphone support components a mode selection switch RE MSEL1 MSEL2 and M8 and 9 keys M1 to M8 and CE The oscillation resistor is chosen so that the total recording period is 60 seconds with a sampling rate of 4 2 kHz Users can change the value of the ROSC to obtain other sampling frequencies It should be noted that if the sampling rate is increased the length of recording time is decreased Table 3 gives the details An 8 16 Ohm speaker is to be used with the module Users can select different modes using the mode selection switch The module is measured 80mmx55mm Connection points 0 8 C and B can connect to other switches or external digital circuits In this cased on board keys M1 to M8 and CE are by passed Mode selection switch
6. e the current sound track Press other key while a sound is being played causes a new sound track to be played If a key from M1 to M8 is pressed continuously the particular sound track will be played continuously Press CE to stop playing the sound track 3 2 Serial mode recording and replaying Record sound tracks sequentially This is an example of recording sequential sound tracks The mode switch should have the following pattern MSEL1 O switched to right hand side of the mode selection switch MSEL2 0 right hand side M8 1 left hand side RE 0 right hand side Press CE first to reset the sound track counter to zero Press and hold M1 down and you will see BUZY LED illuminates You can now speak to the microphone Recording will terminate if M1 is released or if the recording time exceeds 60 seconds in this case you will run out the memory for your next sound track Press M1 again and again to record 2 3 4 and other consecutive sound tracks Each sound track may have different lengths but the accumulated length of all sound tracks will not exceed 60 seconds Replay sound tracks sequentially Now make RE 1 switched to Left hand side of the mode selection switch while keep other switches at the same location Toggle M1 press key and release causes the 1 sound track to be played once Toggle M1 again and again will play the 2 3 4 and other consecutive sound tracks Press CE to reset the sound track coun
7. istance sampling rate bandwidth and recording period are shown in Table 3 OSCR resistance APR9600 sound recording module Table 3 OSC resistances Sampling rate Bandwidth Recording time Second 5 Application tips Tips for better sound replay quality 1 Use a good quality 8 Ohm speaker with a cavity such as speakers for computer sound systems Do not use a bare speaker which gives you degraded sound 2 For better sound replay quality speak with a distance to the on board microphone and speak clearly Also keep the background noise as low as possible 3 For even better sound replay quality use microphone input or Audio Line In input If Audio Line In is used the amplitude of input signal should be lt 100 mV p p Intec Associates Ltd
8. ter to zero Record sound tracks with forward control This is an example of recording sound tracks with forward control The mode switch should have the following pattern MSEL1 0 switched to right hand side of the mode selection switch MSEL2 0 right hand side M8 0 right hand side RE 0 right hand side Press CE first to reset the sound track counter to zero This mode is rather similar to the above sequential sound recording The only difference is that after M1 is pressed and released the sound track counter does not increment itself to the next sound track location To move to the next sound track M2 should be toggled So if M1 is not toggled again and again without toggling M2 sound will be recorded at the same sound track location Replay sound tracks with forward control Now make RE 1 switched to Left hand side of the mode selection switch while keep other switches at the same location Toggle M1 press key and release causes the 1 sound track to be played once Toggle M1 again and again will still play the 1 sound track Once M2 is toggled the sound track counter is incremented and the next sound can be played Press CE to reset the sound track counter to zero Intec Associates Ltd INTEC DATA SHEETS 4 Sampling rates The sampling rate is determined by the value of the OSC resistor R8 in the circuit diagram It can be adjusted by users to suit their specific requirements The relationships amongst the res
9. y switches to allow users to explore all functions of the APR9600 chip The oscillation resistor is chosen so that the total recording period is 60 seconds with a sampling rate of 4 2 kHz The board measures 80mm by 55mm APRSGO0OG APR9600 Experimental board Intec Associates Ltd INTEC DATA SHEETS 1 APR9600 Pin out of the APR9600 is given in Figure 1 A typical connection of the chip is given in Figure 2 This is the circuit diagram of the module Pin functions of the IC are given in Table 1 During sound recording sound is picked up by the microphone A microphone pre amplifier amplifies the voltage signal from the microphone An AGC circuit is included in the pre amplifier the extent of which is controlled by an external capacitor and resistor If the voltage level of a sound signal is around 100 mV peak to peak the signal can be fed directly into the IC through ANA IN pin pin 20 The sound signal passes through a filter and a sampling and hold circuit The analogue voltage is then written into non volatile flash analogue RAMs APR9600 sound recording module APR9600 vecbD RE ExtClk MSEL2 MSEL1 CE Strobe Ana_out Ana_in AGC MicRef Micin VCCA SP M1L Message M2 Next M3 M4 M5 M6 OSCR M7_END M8_ Option Busy BE VSSD VSSA SP 1 2 3 4 5 6 7 8 Figure 1 Pin out of APR9600 It has a 28 pin DIP package Supply voltage is between 4 5V to 6 5V During recording and
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