Antex-electronics SX-5e Manuel d'utilisateur

SX-5e SX-6SX-34 SX-36Digital Audio AdapterUser's ManualSeptember 17, 1999Rev. EANTEX ELECTRONICS CORPORATION1125 W. 190th STREETGARDENA, CALIFO

5SX-35/36 CONNECTOR DESCRIPTIONJP1SX-35/36JP4JP7JP8JP9BALANCEDIN/OUTJP3Pin Assignment1Ground2 Right In -3Left In-4Right Out -5Left Out -6 Right In +7

6LINE I/0 (JP8)Pin 1 Right Line Input +Pin 3 Right Line Input -Pin 5 Left Line Input +Pin 7 Left Line Input -Pin 9 Right Line Output +Pin 11 Right Li

7AUX IN (JP9)Pin 1 Right Aux Input +Pin 3 Right Aux Input -Pin 5 Left Aux Input +Pin 7 Left Aux Input -Pin 9,11,13,15 No connectionPin 2,4,6,8,10,12,1

8SX-34 CONNECTOR DESCRIPTIONJP5LINE INMICSX-34AUXLINE OUTJP6JP7 JP4JP1Figure 3. SX-34 Connections1. SPx Header - JP1JP1 is a 40-pin, dual-row, 2mm sp

93. AUX Header - JP6JP6 is a 5-pin, 0.100" spaced header that provides connec-tions for left and right auxiliary input signals. These are thesame

105. Mono Header - JP4JP4 is a 2-pin, 0.100" spaced header that provides a mono in-put connection. This input is not currently supported.1Ground

11SX-6 CONNECTOR DESCRIPTIONJP1SX-6JP4JP2BALANCEDOUTJP3Pin Assignment1 Ground2nc3nc4 Right Out -5 Left Out -6nc7nc8 Right Out +9 Left Out +DB-9FemaleB

12LINE OUT (JP2)Pin 1,3,5,7 No connectionPin 9 Right Line Out +Pin 11 Right Line Out –Pin 13 Left Line Out +Pin 15 Left Line Out –Pin 2,4,6,8,10,12,14

13SX-5e CONNECTOR DESCRIPTIONThe SX-5e is self-explanatory. The left and right Line Out con-nections are RCA jacks on the card bracket, which are lab

14Antex cards are “active”; transformers are not used. Normally,one should not ground the output of an active driver. However thedrivers used on the

Declaration of ConformityStandards to which Conformity is Declared:EN55022 (Class A) 1994, EN 50082-1 1992This equipment has been verified to comply w

15This is because the input amplifier stages of the card have beenoverloaded. Also, recording from a source with too low a signallevel, such as plugg

16externally, there must be 2 cards installed in the computer, so thatthere is one physical output for each device.COMPRESSION, DATA RATES, AND NETWOR

17a file, but no fading. Some audio editing programs do edit MPEGfiles, but they actually convert the file to PCM16 first, and thenconvert it back ag

18tained for a given output bitrate therefore changes with samplerate.In the Antex software the bitrate is specified on a per-channel ba-sis. Therefor

19DRIVER INSTALLATIONWINDOWS 951. After installing the card, power up the system.2. Open Control Panel-Add New Hardware applet.3. Press “Next”.4. Sele

205. Select “Driver” tab.6. Select antexwav.vxd, click on “Change Driver”.7. Select "Have Disk"8. Point to location of driver files. Click

218. Make sure “Search for a better driver…” is selected.9. Select the location of the new driver.10. Click “Next”. Click “Next”. Click “Next”. Cli

22ANTEX APPLICATION SOFTWARE INSTALLATIONThe Antex Demo, Mixer, and Meter programs are on a separatefloppy disk. The same disk is used for Windows 95

23USING WINDOWS DEMONSTRATION SOFTWAREFigure 5. Antex Demo ProgramThe Antex Demo program allows basic recording and playback of.WAV files in any of t

24Compression:This list box selects specific compression formats for re-cording, and displays the compressed format of the filecurrently playing. Not

TABLE OF CONTENTSINTRODUCTION...1CARD INSTALLATION...

25Channels:These buttons select mono or stereo recording, and dis-play the number of channels of the current file.VU Meters:The VU meters show the rel

26File:This button selects a filename for recording or playback.Once this button has been pressed the dialog box inFigure 7 will appear. If you hold

27Volume:These controls allow changing the volume of the playbackonly.INSTALLING AND USING MULTIPLE CARDS IN A SYSTEMWhen using more than one card in

28Simultaneous Record and PlaybackMPEG MSADPCM PCM16SX-34 No 22.05 KHz 48 KHzSX-35 No 22.05 KHz 48 KHzSX-36 32 KHz 32 KHz 48 KHzDual Device PlaybackMP

29and right channels of a stereo signal. Also, only one record deviceis shown. The small circles with a letter inside correspond be-tween the Mixer Di

30 “Radio pushbutton” controls G, H, I, and J determine the recordsource. Only one button on at a time is allowed. It may seemstrange that button J

31down if the output signal from the Antex card is too loud. One ex-ception to setting both sliders at maximum is when playing 2 filessimultaneously.

32LKAABCD EG HI JFigure 9. SX-36 Mixer

33Figure 10. SX-36 Block Diagram

34SX-34 MIXER AND BLOCK DIAGRAMThe SX-34 diagrams are the same as the SX-36, with the excep-tion that the SX-34 does not have the Input or Output Trim

SX-34 MIXER AND BLOCK DIAGRAM... 34SX-6 MIXER AND BLOCK DIAGRAM... 36SX-5e MIXER AND BLOCK DIAGRAM...

35Figure 12. SX-34 Block Diagram

36SX-6 MIXER AND BLOCK DIAGRAMOutput Trim Control B determines the level of the output signal onLine Out which corresponds to digital clipping. If th

37MLBKFigure 13. SX-6 Mixer

38Figure 14. SX-6 Block Diagram

39SX-5e MIXER AND BLOCK DIAGRAMDue to the simplicity of the SX-5e, the Antex Mixer does not addcontrol of any features that are not accessible through

40and controlling the volume using the master volume control on theexternal amplifier or mixing board the Antex Card is connected to.One exception to

41Figure 16. SX-5e Block Diagram

42ANTEX METERThe figure below shows a typical Antex Meter window. This canbe opened by running “meter.exe” or double-clicking on the metericon. The

43If you right-click or double-click on the meter window, the followingwindow will pop-up:Figure 18. Antex Meter pull-down menu

44Clicking on “Options” will open the following window:Figure 19. Antex Meter options“Visible Lines” allows you to select which devices have VU meter

FIGURESFigure 1. SX-5e,6,34,35 & SX-36 Jumper Settings... 2Figure 2. SX-35/36 Connections...

45“Meter Update Interval” determines how often the meter programreads the level data from the Antex Card. Note that even if themeter is in peak mode,

46TROUBLESHOOTINGI get an error message when trying to run the Antex Demoprogram.1. Card did not install correctly because of an I/O or interruptconf

47Files I record sound “dull”.1. Use a higher sample rate. Lower sample rates reduce thehigh frequency content, making recordings sound dull.There i

48too hot. To see if this is the problem, does the Line Out sounddistorted when just listening to the record source as a feed-through?Files recorded

49• If using several cards in a system, try just playing one fileon one card. If this solves the problem, your system maynot be fast enough to handl

50APPENDIXConnectors for Male HeadersFor connecting to the auxiliary connectors on the Antex Card,there are 2 types of connectors to use. One type is

51milliwatt into 600 ohms, which is .775 volts RMS. dBV uses 1 voltRMS as the reference.Digital ClippingDigital clipping is the point where the Analo

52SpecificationsUnless otherwise noted, THD+N and Dynamic Range measure-ments are done at 1KHz, A weighting, 48 KHz sample rate.Maximum input and outp

53SX-34:THD+N... .02% maxDynamic Range...

54SX-5e:THD+N...02%Dynamic Range...

1INTRODUCTIONThe Antex SX-5e, SX-6, SX-34 and SX-36 family of cards are ISAbus audio “add-in” cards for the PC. They all incorporate DSP’s(Digital Si

55In essence, digital audio is a technological process whereby ananalog audio signal (produced when sound waves in the air excitea microphone) is firs

56Figure 20. Analog-to-DigitalTo visualize the analog-to-digital conversion process, refer toFigure 20. At the top is one cycle of an analog input s

57Digital-to-analog conversion (used in playback) is the exact oppo-site of the analog-to digital conversion process and is illustrated inFigure 21.In

58The foregoing is a very brief and, of necessity, oversimplified ex-planation of how digital audio works. For the interested reader,the book Princip

2Set the board number with jumpers as shown below. If only oneboard is being used, leave the jumpers off (sets to board numberone). When using more

3I/O ADDRESSES AND INTERRUPTSSX-5e, 6, 34, 35 & 36 I/O addresses and interrupts are softwareselectable. The valid I/O addresses are:180h, 220h,

4balanced connections and shielded coax cable for unbalancedconnections. See the section “Balanced and Unbalanced Sig-nals”.