- DRM Software Radio website
Contents
1. Switches to the PAD page CTRL ALT P the multimedia service marked as belonging to the currently selected audio program will be displayed E Navigates back in browsing history ALT LEFT ARROW Eg Navigates forward in browsing history ALT RIGHT ARROW Prints the content of the currently displayed page CTRL P Shows the About dialog indicating the version of the Fraunhofer DRM MultimediaPlayer DRM Software Radio User Manual Version 1 3 Page 24 of 31 An example for the DATA ONLY selection page is shown below It is accessed by clicking on the Home button The actual content of this page depends on the DRM multimedia services which are currently received Each of the listed multimedia services can be selected by clicking on the corresponding hyperlink From there it is possible to navigate further depending on the kind of service selected Ee prin itultimedia Player gy 5 x alge S gt Fraunhofer DRM Multimedia Player Please select a service Slide show bit visuAlity News Service umaing Go to service selection page DRM Software Radio User Manual Version 1 3 Page 25 of 31 VT 7 Software Setup 7 1 Software Installation 1 Insert CD 2 Run Setup_DRMSoftwareRadio_x x x exe and follow the instructions x x x is a placeholder for the actual revision of the software 3 Copy the license key file into the installation directory 4 Run DRMSoftwareRadio exe link is placed on2. This dialog is used to Select the input soundcard for the DRM IF input Select the output soundcard used for the playback of the decoded audio signal Switch the spectral inversion of the input signal on off Disable the Multimedia support stop eee x Input Soundcard Creative Sound Blaster AudioPLI Output Soundcard Creative Sound Blaster AudioPLI Spectral inversion of input signal Disable Multimedia Cancel DRM Software Radio User Manual Version 1 3 Page 15 of 31 Recording After pressing the Record button on the main window a new dialog is displayed where specific information on the reception can be entered e g the frequency the frontend is tuned to the receiver location Also the output directory for the recording can be selected in this dialog If you do not Know your exact position e g from a GPS device you can press the Calculate button to open a further dialog box where your position can be determinated by using an airport nearby as an reference point Frontend Frequency f 425000 Hz Aecever position latitude 4 55279N degree H75 Calculate longitude 17 001 4E degree W E output file Directory g n Below is the dialog for estimating the current receiver position by using an nearby airport as a reference Setup Location i x Select the country in which your receiwer is located Select the airport nearest to you Country Germ
3. and next buttons Prous NeXt allow easy and quick navigation through all the news messages and sub menus contained in the current menu DRM Multimedia Player 2 0 x an e G h NewsService NewsService Journaline O D Online English news British police probe death of activist shot in Gaza Stri Airbus delivers more planes than Boein Iran ups death toll from Bam quake to 41 000 Prodi presses Turkey over Cyprus Germany considering possible role in Iraq a On Mars NASA rover ready for close ups NASA scientists relieved South Korean president names new foreign minister Germany France and Poland seek ways out of European constitution deadlock Shi ites back cleric s call for elections in Iraq Siemens to build Iraqi cell phone network Israel issues veiled threat to resume targeted killing of Palestinians World Social Forum opens in Bombay Bush and Bremer to meet in Washington Japanese troops head for Irag ahead of historic mission DRM Software Radio User Manual Version 1 3 Page 19 of 31 VT RA a g F s Herin Fa an p l a a G _ cprrimminiicaTionsc Qn BE ERSE aaa ri th C ca Se J sdn lt D DRM Multimedia Player Glad e p S A M NewsService Journaline O rnaline a lt previous t up next gt Dw Online The German government wants to extend subsidies for sustainable energy projects in Germany such as wind powered electricity generation Environment
4. VT e Service buttons with service labels service information e g language country audio type with without SBR mono stereo and bitrate of the service content DRM text message e Local UTC time display The user can e Select one of the 4 possible services with the 4 buttons on the right e Start the Multimedia Player for streams with multimedia content by pressing the according stream button e Adjust the output volume slider in the lower middle of the screen e Record status data to file Record button 4 services can be transmitted the services can contain audio and or multimedia data content the button with the audio service that is played by the soundcard is displayed in white light grey buttons for possible other audio services are grey with back labels buttons for services with multimedia content are also grey with black labels when clicking on an button with multimedia the multimedia viewer will be opened or if the multimedia viewer is already running the display will be switched to this content If an audio service is also containing multimedia data clicking on this button will also open the multimedia viewer buttons for unused services are grey with a grey label no service the text on the buttons have on the first line the name of the service and on the second line information on the content of this service country Language type audio multimedia data and bitrate Setup dialog
5. 2440 XL 2 4 GHz 512 MB RAM SIS 7012 Wave built in Unbranded PC with AMD Athlon 1 7 GHZ amp Soundblaster Live 5 1 DRM Software Radio User Manual Version 1 3 Page 9 of 31 VT MEDION 2 5GHz from ALDI HOFER in Austria sometimes you need to disable the AGC or sound boost via the settings for the soundcard This depends on the driver you have loaded for the soundcard An external soundcard had to be used with the following PC as the internal one was not suitable Compag Armada E500 Unspecified mainboard with integrated C media sound Sometimes soundcards can seem to work but do not have full duplex ability In this case audio dropouts will occur The following procedure can give an indication of the location of the problem Use the record function to generate a file Here is a file recorded and posted by tido1322 in the forum www drmrx org forum DRMSoftwareRadio MERLIN 00000127 software type and licence number Software Version 2 0 34 software version number Starttime UTC 2004 01 11 15 18 00 derived from users PC internal clock Frequency 6095 kHz user enters this at start of recording Latitude 44 49 N user enters this at start of recording Longitude 0 38 W Label RTL DRM derived from the first correctly decoded SDC data block at the start of the transmission It is recomended that users allow the receiver to lock up to the transmission before recording starts otherwise this field will be N A Bitrate 20 88
6. i D 0 i d l F E 7 x n Mal T oO R fd statu hit Jt 80d B m ETE 100d B Wl Data Setup WZkHz 5kHz WkHz 5kH2 12kH2 P Sune snn gg Inf dB ORM Senyrices Service Mame OW Wertachtal audio Text jJ Type Information Encoding AWC SBR 20 9kbps Country Germany Language No language speci Text message lt lt waiting for text message gt gt Time 00 00 07 680 82 MB 6130 idesihinay 4 E diml b095khz2 way i drm 6O 95k hz waw ee pe pan Oe fee IF unnamed if wary Unnamed Output file Data logging P Enable muttimedia Playlist Upon pressing the Setup button the following window appears Setup DELE SIOL DRM Data logging Wawe device 9 SOuUndMAX Digital Audi Receiver position hier device a OUP d Mi nika E igital A L dio Latitude of a North tixer line Line In Longitude n Input lewel 10 Log file directory Defaut audio codec COPROGRA1 WINRADIC plugin fudi codec 45 PCM PCM Recording directory LOPROGRA 1 WINR ADI Audio Codec param O00 EH rip OB it Mond Codec status Unis tonmat is OF About Help CPU Usage 3 95 DRM Software Radio User Manual Version 1 3 Page 29 of 31 VT Firstly you will need to configure the sound card i e the Wave device Mixer device and Mixer line parameters These parameters are the same as used to set up the conventional demodulator supplied with the G303 receiver and exactly the same settings should be used and the same steps f
7. is shipped as an integrated part of the DRM Software Radio It permits the presentation of multimedia content which is sent in addition to audio services as part of the DRM signal 6 3 1 Available types of multimedia applications The following pages describe the types of multimedia applications can currently be explored by using the Fraunhofer DRM MultimediaPlayer DRM Software Radio User Manual Version 1 3 Page 18 of 31 V7 NewsService Journaline NewsService Journaline provides textual information in a hierarchically structured way It is very easy to navigate to exactly the type of information the user is currently interested in NewsService Journaline is especially optimized for the limited data capacities available in digital broadcast systems It is tailored to the typical hardware infrastructure available in mobile environments like a car radio and can just as well be used with graphic oriented user interfaces like a PC The service always starts with the main welcome page This page typically contains a menu giving the user access to sub menus and or news messages by just clicking on a topic Grayed out menu items have not yet been received The top of the screen contains the navigation area Newsservice der uk045 Deutsche Welle Nachrichten Divi News english t The user can easily return to any higher level menu by just clicking on its name The up button returns to the next higher menu level The previous
8. kbps derived from the first correctly decoded FAC data block at the start of the transmission Mode B derived from the first correctly decoded SDC data block at the start of the transmission Bandwidth 10 kHz Bandwith of signal derived from the first correctly decoded FAC data block at the start of the transmission Comment TS440 Thinkpad User comment entered at start of recording MINUTE SNR SYNC AUDIO TYPE 0000 26 150 1492 10 0 0001 26 150 1474 10 0 0002 25 150 1399 10 0 0003 24 150 1409 10 0 0004 25 150 1348 10 0 0005 24 149 1242 10 0 0006 24 150 1380 10 0 0007 25 150 1429 10 0 0008 25 150 1422 10 0 0009 25 150 1472 10 0 0010 24 150 1342 10 0 DRM Software Radio User Manual Version 1 3 Page 10 of 31 VT 0011 25 150 1346 10 0 0012 26 150 1348 10 0 0013 26 150 1401 10 0 0014 24 150 1086 10 0 0015 22 150 908 10 0 0016 21 150 790 10 0 0017 19 150 500 10 0 0018 21 149 805 10 0 Here is a guide for the meaning of the figures MINUTE minute of recording SNR average SNR of this minute SYNC number of frames in this minute where FAC CRC was OK AUDIO number of error free audio frames in this minute and separated by number of audio frames per transmission frame TYPE 0 AAC etc audio coding type If we take a look at the AUDIO column we can see how many audio frames are decoded correctly Each audio transmission frame is 400 mS long and Tidos1322 file the 10 part indicates there are 10 audio frames per t
9. registration To enable the functionality of the DRMSoftwareRadio the user needs a personalized key file This file is provided after the purchase of the software The file has to be copied into the installation directory The user is not allowed to distribute this key file 6 2 Graphical user Interface The picture below shows a running DRMSoftwareRadio On the right side you can see the four buttons to select the DRM Service Up to four services may be available in a DRM transmission Bgl DRM Software Radio 1 0 19 Input Spectrum Sere Ge Audio wt Data Sync Level dBFS 7000 4000 DAM SoftwareR adio FhG_ IS_ 4 1 0000004 Uzer name gt lt emall address gt Status 18 5 x Time UTC 09 53 05 local 10 53 05 FG Radio ny English Old fea 450 1100 Pop husic Audio AAC SBP Multimedia DRM Slideshow sh Curent Affairs hduttimedia 7 0 kbps Germany Engli Multimedia Merlin Website Germany English Information Multimedia 7 0 kbps ho Ssenice DAM Smooth Sound hh coding O v technologies Fraunh ofer Institut Integrierte Schaltungen The DRMSoftwareRadio window displays e Input Level as an LED level meter e FFT of the Input Signal as an plot e SNR of the Input Signal e status of the decoder sync data audio decoding state as an green red LED DRM Software Radio User Manual Version 1 3 Page 14 of 31
10. Minister Juergen Trittin today submitted amended draft legislation that aims to lift Germany s usage of alternative sources to 20 percent of all its energy consumed by 2020 The sector had already become Germany s boom branch he said employing 135 000 people In wind power Germany led the world and in solar energy it was second behind Japan Opposition CDU parliamentarian Peter Paziorek questioned the scheme s economic viability saying subsidies should be capped by 2010 The legislation would also span hydro electric generation underground thermal systems and biomass where waste rots to generate gases e MOT Broadcast Website This multimedia service allows the broadcast of complete web sites including HTML pages and images The individual capabilities of a receiver are defined as receiver profiles The Fraunhofer DRM MultimediaPlayer supports the full unrestricted profile This means easy access to all current and future features of the HTML and other internet standards The user can navigate through the received HTML pages as if they were loaded from the Internet ES DRM Multimedia Player OF x 2 A om g Traffic Service 5 July 2001 07 14 pm Highways State Streets AS Nuremberg to Munich between Denkendorf and Lenting car accident 2 lanes blocked 07 08 pm DRM Software Radio User Manual Version 1 3 Page 20 of 31 wz e MOT SlideShow The MOT SlideShow is a very convenient application especially when
11. Software Radio User Manual Version 1 3 Page 4 of 31 VT 3 Contact information and Updates of software Via Website at http www DRMrx org http www DRMswr com This web site will be supported and maintained for a 2 year period from December 2002 to January 2005 Updates and new versions of the software will be downloadable for registered users from this web site After initial purchase of the software future upgrades will be provided free of charge to registered users DRM Software Radio User Manual Version 1 3 Page 5 of 31 VT 4 Overview 4 1 Receiving path The following picture shows the DRM Software Radio system for reception of DRM signals Commercial PC with Frontend FhG Software Radio DRM Signal in the Air Antenna 12 kHz eae ee The DRM Signal is received by an commercial long medium shortwave SW MW LW front end Any front end should be usable which can provide an IF of 12 kHz direct or with a adapter circuit The bandwidth must be greater 10 kHz for normal transmissions and greater 20 kHz for transmissions with channel bundling This signal is then fed into a standard soundcard The soundcard must offer a sampling rate of 48 kHz For output of the audio signal also a soundcard with a sampling rate of 48 KHz is required If one sound card is used for sampling the signal and output of the music the soundcard must provide full duplex operation Most of all newer soundcards provide all the
12. The multimedia application is independent from any audio program It is presented to the user as a stand alone DRM service and can individually be selected lf a DRM Multiplex does not contain any audio services all multimedia services are signaled as stand alone DRM services Please note that the DRM TextMessage Service is the only type of multimedia service which cannot be signaled as Data only All other types of multimedia services can be signaled either as PAD if the broadcaster wants to link the multimedia service to his audio program or as Data only if their content is independent from any audio service 6 3 2 Starting the Fraunhofer DRM MultimediaPlayer The Fraunhofer DRM MultimediaPlayer can be started by directly pressing one of the up to four available DRM service buttons if the selected DRM service carries a multimedia service as PAD or Data only bit express ed Gudio AAD BBR parametric stereo 17 8 kbps Chituttimedian 1 k bit express News BBR parametric stereo 17 8 kbps text 80 bps Multimedia bit visuAlity Germany Multimedia wournaline Germany Ge Wultimedia 4 1 kbps 10 1102 The example above shows a DRM Multiplex carrying a full set of four possible DRM services two audio services blue circles both being linked to a PAD multimedia service red circles and two stand alone multimedia services red circles with Multimedia service label prefix
13. VT DRM Software Radio PC based software for DRM reception User Manual Version 1 3 DRM Software Radio User Manual Version 1 3 Page 1 of 31 VT Content 1 DOCUMENT INFO 3 2 COPYRIGHT INFORMATION 4 3 CONTACT INFORMATION AND UPDATES OF SOFTWARE 5 4 OVERVIEW 6 4 1 Receiving path 6 4 2 Modifications of existing frontends 7 4 3 Block diagram of the Software 8 4 4 Minimum System Requirements 9 4 5 Tested soundcards 9 5 FEATURES OF THE DRM SOFTWARE RADIO 13 6 OPERATION OF THE DRM SOFTWARE RADIO 14 6 1 User registration 14 6 2 Graphical user Interface 14 6 3 Multimedia Error Bookmark not defined 7 SOFTWARE SETUP 26 7 1 Software Installation 26 7 2 Setup FAQ s 26 8 DRM DECODER PLUG IN FOR WINRADIO G303 SOFTWARE DEFINED RECEIVERS 27 8 1 WiNRADiO G303 Software Defined Receivers 27 8 2 DRM Decoder Plug in for WiINRADiO G303 Receiver 28 8 3 Installing WiNRADiO DRM Decoder Plug in 28 8 4 Using WiNRADiO DRM Decoder Plug in 30 DRM Software Radio User Manual Version 1 3 Page 2 of 31 VT 1 Document Info Document DRM Software Radio User Manual Authors Thomas Jaumann Gerd Kilian Thomas Langer Alexander Zink Thomas Fruhwald James Briggs Milan Hudecek Date 2004 02 15 Version 1 3 VT Merlin Communications takes no responsibility for wrong or missing information in this document As the DRMSoftwareRadio is still under development all information given in this document especially the graphical outfit and the available
14. Wultimedia 4 1 kbps 10 1101 After startup the Fraunhofer DRM MultimediaPlayer will initially either show the current PAD multimedia service if an audio service with attached PAD multimedia service is currently selected or the overview page which allows the user to select one of the signaled Data only services stand alone multimedia services DRM Software Radio User Manual Version 1 3 Page 22 of 31 V7 6 3 3 Using the Fraunhofer DRM MultimediaPlayer The Fraunhofer DRM MultimediaPlayer allows the user to switch between the program associated data PAD tightly belonging to the audio program which is currently played and the stand alone data services which are broadcast on the same frequency If the user wants to access the stand alone data services he gets an overview in form of a list of all data services currently broadcast on the tuned DRM frequency to choose from see graphic below ES DRM Multimedia Player g Oj x B ae amp F Fraunhofer DRM Multimedia Player Please select a service Slide show bit visuAlipy News Service Lear DRM Software Radio User Manual Version 1 3 Page 23 of 31 VT The following features can be accessed by pressing the corresponding buttons e Toggles between full screen and regular view Switches to the DATA ONLY selection page CTRL ALT H all stand alone multimedia services which are broadcast within the current DRM program will be listed for selection
15. and stand alone data application support M Text messages M Slideshow service M Broadcast Website M News Service Journaline decoder gt Audio decoder Vv AAC VI SBR VI HVXC DRM Software Radio User Manual Version 1 3 Page 12 of 31 VT 5 Features of the DRM Software Radio The DRM Software Radio enables you to receive and to listen to DRM transmissions by using a suitable PC see chapter System Requirements and a suitable frontend DRMSoftwareRadio exe includes Channel Decoder The Channel Decoder is the Software inside the DRMSoftwareRadio which does the decoding of the DRM signals The Channel Decoder is part of the DRMSoftwareRadio exe program The Channel decoder is based on technology developed and licenced from the Fraunhofer Institute http Awww iis fhg de meee miss Fraunhofer jit Integrierte Schaltungen MPEG4 AAC SBR Decoder The Audio Decoder decodes the binary data transmitted in a DRM signal and produces audio output It is part of the DRMSoftwareRadio exe program The decoding libraries were provided by Coding Technologies www codingtechnologies de 7 coding O V technologies Graphical user interface Includes user localization based on Airport locations Includes recording of status files Description please see following chapters Multimedia Description see following chapters DRM Software Radio User Manual Version 1 3 Page 13 of 31 VT 6 Operation of the DRM Software Radio 6 1 User
16. any Airport NUREMBERG w Enter the distance and direction from your receiver to the airport Distance je kilometers Bearing SE Lat 49 552794 Lon f 1 001 92E Close DRM Software Radio User Manual Version 1 3 Page 16 of 31 NT About Box The about box provides Version number s copyright information and Web addresses of the evolved project partners About DRM Software Radio x DAM Software Aadio 1 0 19 Copyright S2002 FhG 5 4 All rights reserved This product may not be copied escept to make single copies for archival or backup purposes and may not be decompiled or reverse engineered for other purposes or under other conditions than those stated in amp 69 e German Copyright Act This product i only licensed for private use For receivers available for commercial use please visit our website http Awww iis fhg dedab products dimreceryer Channel decoder and Audio coding technology licensed by Fraunhofer 15 4 Portions of Enhanced MPEG 4 440 56R coding technology licensed by CODING TECHNOLOGIES o9 ze agi Ae G Dr m VT Fraunhofer mia coding O T e 7 m Communications Integrierte Schaltungen technologies DAM fatto ana dim or Merlin Communications http fw merhncommurnications com Fraunhofer 1S http faye fhg de coding technologies http www codingtechnologes com DRM Software Radio User Manual Version 1 3 Page 17 of 31 VT 6 3 Multimedia The Fraunhofer DRM MultimediaPlayer
17. combined with an audio main program In this case the user receives automatically updated visual information while listening to the audio service A typical example is the weather forecast While the radio speaker explains the weather situation for the next days the user of the Fraunhofer DRM MultimediaPlayer can even see the weather map ES DRM Multimedia Player g O x Bl a t MOT SlideShow service Live Audio Encoder Multimedia DataServer DRM Multiplexer TextMessage bit express bit f r bit ein hit service Ready e DRM TextMessages This application type is also Known as Dynamic Labels While the user listens to an audio program he receives the latest news and updates on the screen in textual form immediately when they are broadcast This information may comprise artist title of the current song studio telephone numbers traffic news stock information weather updates or other individual messages from the broadcast station to its listeners DRM Software Radio User Manual Version 1 3 Page 21 of 31 VT Every type of DRM multimedia service can be signaled in two ways within the DRM multiplex e PAD Program Associated Data The multimedia application is tightly linked to an audio program It is only decoded when the associated audio service is currently selected When the user selects this audio service the PAD multimedia application is automatically started e DATA ONLY Non PAD
18. desktop 7 2 Setup FAQ s Q The software can not see the key even though Know it is in the directory A Some e mail programmes may rename the key for instance a keyfile sent as DRMSoftwareRadio 000001 73 key is renamed to DRMSoftw key when saved to the hard disk In this case the software will not recognise the key due to the invalid name Rename the key with its original name DRM Software Radio User Manual Version 1 3 Page 26 of 31 VT Merlin Communications 8 DRM Decoder plug in for WiINRADiO G303 Software Defined Receivers 8 1 WiNRADiO G303 Software Defined Receivers The WiINRADiO G303 is the first commercially available Software Defined Receiver where the entire demodulator and last intermediate frequency are performed by software running on a personal computer The output of the receiver hardware is 12 KHz intermediate frequency with 15 KHz bandwidth the receiver has excellent sensitivity and phase noise and is therefore suitable for DRM reception without the requirement for any hardware modifications to the receiver www winradio com home drm htm The WiINRADiIO G303i is a PCI card based model covering the frequency range from 9 kHz to 30 MHz F A USB or serial controlled external version WiINRADiO G303e is to be available in the first quarter of 2004 DRM Software Radio User Manual Version 1 3 Page 27 of 31 v7 8 2 DRM Decoder Plug in for WINRADiIO G303 Receiver In co operation wit
19. functions are subject to change without notice Revision Index Revision Changes 9 Draft Initial Version revised by Alexander Zink added chapter user registration revised document info S revised document info revision by VT Merlin Communications icati 0 6 Updated screenshots for version 0 0 16 and GUI description 1 Revision for software general release Sound card info update HVXC support Information on service buttons added Screenshots updated Multimedia section revised Added section 8 0 WiNRADiO change in format to VT Merlin style Section 6 3 Multimedia completely revised DRM Software Radio User Manual Version 1 3 Page 3 of 31 VT 2 Copyright information This product and parts of it may not be copied except to make single copies for archival or backup purposes and may not be decompiled or reverse engineered for other purposes The software is for private use only Parts of this manual are copyright of VT Merlin Communications http www vtplc com merlin Single copies of this manual may be reproduced for private use without permission from VT Merlin Communications Parts of the software are under copyright of Fraunhofer IIS http www lis fhg de Portions of Enhanced MPEG 4 AAC SBR coding technology are licensed by CODING TECHNOLOGIES http www codingtechnologies com Portions related to WINRADIO receivers are copyright of WINRADiO Communications hitp www winradio com DRM
20. h VT Merlin Communications WiINRADiO developed a DRM decoder plug in for the G303 receiver which is now available through the DRM software receiver web site www DRMrx org This plug in replaces the conventional demodulator of the receiver with a DRM one which is based on the Fraunhofer FhG software library O WiNRADIO G303 File Options Plugins Demodulators Digital suite Help step Memory 15 215000 a a Auto s Rr EER FARRAR a re a fe Broadcasting KJ cy KE EZ C ocannin j _ ia aan a at HM ORM Status em Search peange ilemory mon Fear VE tion m B 10k Hz 5k Hz Hik Hz 5kH 10kH2 fi Syne Sipe oa q DORM Services emrige 7 j G n i 1 1 E d B mi D ef Ca Serpwice a ydia 3 _ Mame BECWorld Serwice audio j p 50 Ai OkHe 1 410 50 Type Current Affairs Encoding 44C SER 20 3kbps Country Unknown Language English Text message Newshour Tn depth Took at current events g J Time Not available DA wa W E O A Oo E E E H E E K E gt E il gt IF B140 iL way ITC Local time Unnamed 16 08 30 03 08 30 samenee E Playlist 03 Moy 2003 O4 Moy 2003 b OCR The WiNRADiO DRM decoder plug in contains similar features to the FAG DRM Software Radio including multimedia and logging There is also a facility to record the signal both at audio and IF intermediate frequency level 8 3 Installing WiNRADiO DRM Decoder Plug in Unzip the downloaded DRM decoder
21. indows XP or Windows 98 e The software can run under Windows NT but is not officially supported Users using Windows NT should install service pack 6A or later e AT compatible PC e 500 MHz Intel Pentium processor or equivalent e 64 MB RAM e 50 MB free disk space e 16 bit SoundBlaster or compatible soundcard that supports full duplex at 48 kHz sampling rate for input and output the input must be without AGC Automatic Gain Control recommended Creative SoundBlaster Live or USB One USB Audio Interface e LAN network driver or dial up network installed e Suitable frontend with 12 kHz IF output output level suitable for soundcard 4 5 Tested soundcards The following soundcards have been reported as suitable to work in full duplex mode The internal soundcards have been tested and work in the following PC s Dell Inspiron 4100 Dell Inspiron 8000 Dell Inspiron 8100 Dell Inspiron 8200 Dell Latitude 800 Dell Latitude 810 Dell Latitude 840 Sony VAIO PCG C1MHP 860Mhz 128MB with Yamaha AC XG soundcard Dell Dimension desktop 4100 800Mhz 512MB with Creative SB Audio PCI 64V Dell 2 GHz Pentium 4 machine with a SoundBlaster live card Fujitsu Siemens T bird Desktop PC with a 933 MHz PIII amp Soundblaster Live Player 5 1 Soundcard Unbranded Pentium 1 8 GHz with a low cost sound Blaster PCI 128 1200MHz AMD Duron on Elitegroup Corp ECS K7VVM main board with intergrated sound card Laptop Gericom Webengine Force
22. laylist Intermediate frequency files have the if wav extension Double click on the file name to hear a playback There is about 5 seconds of silence for the acquisition and synchronisation to take effect 8 4 Using WiINRADiO DRM Decoder Plug in The real time spectrum display is located in the top left part of the decoder window It shows the received signal from the receiver in the frequency domain The center reference frequency marked as 0 corresponds to 12 kHz the intermediate frequency of the receiver For best receiving results finely tune the DRM signal around the zero frequency mark in the spectrum scope window In the picture above you can see the spectrum of a typical correctly tuned DRM signal DRM Software Radio User Manual Version 1 3 Page 30 of 31 ea The indicator panel shows stereo audio levels volume setting the status of the DRM decoding process Sync will appear first followed by Data and Audio and signal SNR signal to noise ratio For uninterrupted audio decoding a SNR level of at least 18 20 dB is required If the level is lower you will hear drop outs or there will be no audio If the sound card and receiver adjustments do not help then you will need to improve your antenna The information window displays the digital data embedded in the transmission The recording window is used to record and play back the received signal in the wav format If the IF button is re
23. leased then recording will be made of the decoded audio for playback on any wav device The type of codec used for the audio recording can be selected under the Setup button Default audio codec If the IF button is down the 12 kHz intermediate frequency recording will be made using 48kbit s PCM 16 bit mono format The IF recordings have an extension if wav and can only be played back through the WINRADiO G303i DRM software or software compatible with the 12 KHz IF input and capable of decoding DRM signals The two check buttons at the bottom can be used to enable data logging the location and data file path can be set up in the Setup window and multimedia The last two buttons at bottom right can be used to delete a file from the playlist and refresh the playlist respectively For detailed operational instructions use the Help button in the DRM decoder panel DRM Software Radio User Manual Version 1 3 Page 31 of 31
24. or trouble shooting Most initial problems associated with setting up this decoder can be attributed to incorrect sound card settings Typical problems include not selecting the Recording input line correctly which will manifest itself by the absence of any signal appearing in the spectrum scope window failing to mute the Playback input line which will result in listening to the disturbing high pitched 12kHz intermediate frequency sound instead of the useful audio signal or failing to enable the Wave output in the sound card Playback window which will result in no audio Some cards most notably Creative Audigy2 do not provide full duplex on the Line Input therefore alternative inputs must be used e g Microphone input in the case of Audigy2 Detailed installation steps are also available under the Help button of the DRM demodulator panel The Default Audio Codec settings in the Setup panel are used only for recording of the decoded audio and have no effect on the actual DRM decoding process To test the operation of the DRM demodulator you might also like to download and install intermediate frequency sample files from the WiNRADiO Web site www winradio com home g303 drm htm to your audio files folder This folder is specified as Recording directory in the Setup window and its default location is C Program files WiNRADiO Audio files A listing of all available wav files will be displayed in the DRM decoder p
25. plug in into a temporary file Then run the unzipped exe file This will install the plug in in the appropriate folder which in most cases will be C Program files WiINRADiO Plugins The software key issued on purchase of a licence needs to be copied to the same folder When the WiINRADiO G303 application is restarted the DRM decoder should then appear under the Demodulators top bar menu If it does not appear check that DRM Software Radio User Manual Version 1 3 Page 28 of 31 ws 1 Your WiNRADiO G303 receiver software version is 1 27 or higher If not please i download the latest application software from the WiNRADIO Web site www winradio com home download htm 2 The DRM decoder plug in is installed in the correct Plugins folder Upon unzipping and running the installer the resulting file will have the extension xrs which stands for Extensible Radio Specification The DRM decoder is in fact an XRS plug in conforming to WiNRADiO expandable radio receiver standard 3 The DRM software key is located in the same folder as the XRS plug in If the installation was successful and the DRM decoder appears in the Demodulators top bar menu then select the DRM decoder from the menu and proceed to configure the Setup panel To enter this panel press the Setup button which is located under the Mute button in the DRM decoder window od B L l m 20 d A Tgi Purr Fi I iad l 4 d oh Lam
26. ransmission frame So this means for this transmission there are 150 transmission frames and 1500 audio frames per minute For minute 0 the average SNR is 26 150 i e maximum FAC frames were received correctly and 1492 audio frames were received correctly This means 8 audio frames were received with errors am a little surprised that all 1500 frames were not received correctly as a SNR of 26 is very good perhaps there was some transient noise 8 corrupted audio frames would not cause any dropout in practice the audio is still OK if 50 60 of audio frames are received OK lf we look at minute 17 in the file then we can see there were only 500 correctly received audio frames so for this minute we certainly would expect to hear audio drop outs as only 33 of the frames were correctly received So if the file indicates few audio drop outs but you are hearing many then most likely there is a problem with the soundcard DRM Software Radio User Manual Version 1 3 Page 11 of 31 VT Features gt Channel decoder M 4 5 and 5 0 kHz M 9 0 and 10 0 kHz M Mode A B C D M 4 and 16 QAM for SDC M 16 and 64 QAM for MSC M MLC with two iterations M All code rates M EEP and UEP M spectral inversion of input signal M Complete FAC and SDC decoding M Display of Service Label and Service Information M Display of Text messages M All implemented features ETSI TS 100 980 V1 1 1 compliant gt Multimedia M Program associated
27. se features e g SoundBlaster Live from Creative Labs Attention must be taken not to use an input with AGC Automatic Gain Control as this disturbs the DRM signal Please pay attention that most of the internal soundcards of newer notebooks have the AGC enabled and offer no way to disable it They also have very often low pass filters which can not be disabled In order to get the system working on such notebooks or also on other PCs with no or no suitable soundcard we suggest the use of an external USB soundcard e g USB One USB Audio Interface DRM Software Radio User Manual Version 1 3 Page 6 of 31 VT 4 2 Modifications of existing frontends If a frontend provides an IF of 455 KHz it can be used for the DRM Software Radio by adding an 455 kHz to 12 KHz adaptor 455kHz to 12kHz Signal at female DRM Signal from frontend adaptor output connector 455 kHz 12 kHz 467 kHz Worked examples of frontend modifications are posted by the general public at http www drmrx org receiver_mods html DRM Software Radio User Manual Version 1 3 Page 7 of 31 VT Merlin Communications 4 3 Block diagram of the Software The following picture gives an overview about the software modules of the DRM Software Radio DRM Software Radio User Manual Version 1 3 Page 8 of 31 VT 4 4 Minimum System Requirements e Windows 2000 or W
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