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Discussion Groups | TMS320C6x | FW: DSK 6711 can it detect condenser mic input?
Technical discussions about the TI C6000 DSPs (including the c62x, c64x and c67x DSPs).
FW: DSK 6711 can it detect condenser mic input? - Dillon, Tom - Oct 23 16:02:00 2002
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The use of an electret mic on a PC assumes "phantom" power from the sound card. The DSK does not have a mic pre amp circuit ... So you need to use a powered mic. The powered mic I use from Radio Shack looks like a PC mic and has a spot under the stand to install two AA batteries. -----Original Message-----
hi all I am using DSK 6711 fed with a condenser mic (which u get with the computer). Its unable to detect the input from mic even after the pre-amp gain 0f codec is set to 20 dB. The codec is set using the control reg. 4. The mic works fine (I have checked it with windows sound recorder). Does anybody know whats the problem?
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Re: FW: DSK 6711 can it detect condenser mic input? - Jeff Brower - Oct 23 23:05:00 2002
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Tom- > The use of an electret mic on a PC assumes "phantom" power from the sound card. > The DSK does not have a mic pre amp circuit ... So you need to use a powered mic. > The powered mic I use from Radio Shack looks like a PC mic and has a spot under the > stand to install two AA batteries. Or use one with a wall-wart so when your signal gain is messed up you don't suspect your algorithm when actually it's the batteries. Jeff Brower DSP sw/hw engineer Signalogic > -----Original Message----- > From: [mailto:] > Sent: Wednesday, October 23, 2002 10:46 AM > To: > Subject: [c6x] DSK 6711 can it detect condenser mic input? > > hi all > > I am using DSK 6711 fed with a condenser mic (which u get with the computer). Its > unable to detect the input from mic even after the pre-amp gain 0f codec is set to > 20 dB. > > The codec is set using the control reg. 4. > > The mic works fine (I have checked it with windows sound recorder). > > Does anybody know whats the problem? > plz let me know > > thank u all |
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Re: FW: DSK 6711 can it detect condenser mic input? - Author Unknown - Oct 24 6:02:00 2002
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But AD535 codec has got the pre-amp for the mic input. Which can give upto 20 dB of gain. "Dillon, Tom" <>: > The use of an electret mic on a PC assumes "phantom" power from the > sound > card. The DSK does not have a mic pre amp circuit ... So you need to > use a > powered mic. The powered mic I use from Radio Shack looks like a PC mic > and > has a spot under the stand to install two AA batteries. > > -----Original Message----- > From: [mailto:] > Sent: Wednesday, October 23, 2002 10:46 AM > To: > Subject: [c6x] DSK 6711 can it detect condenser mic input? > hi all > > I am using DSK 6711 fed with a condenser mic (which u get with the > computer). Its unable to detect the input from mic even after the > pre-amp > gain 0f codec is set to 20 dB. > The codec is set using the control reg. 4. > > The mic works fine (I have checked it with windows sound recorder). > > Does anybody know whats the problem? > plz let me know > > thank u all > _____________________________________ > ------------------------------------------------- Sify Mail - now with Anti-virus protection powered by Trend Micro, USA. Know more at http://mail.sify.com Want to get into IIM? Take the Sify Mock CAT now! http://education.sify.com/mockcat |
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Re: FW: DSK 6711 can it detect condenser mic input? - Jeff Brower - Oct 24 13:02:00 2002
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Seshu- > But AD535 codec has got the pre-amp for the mic input. > Which can give upto 20 dB of gain. That's Ok for dynamic mic or other powered-mic, but not enough gain for condenser mic. Something like 40 dB is needed. Jeff Brower DSP sw/hw engineer Signalogic > "Dillon, Tom" <>: > > > The use of an electret mic on a PC assumes "phantom" power from the > > sound > > card. The DSK does not have a mic pre amp circuit ... So you need to > > use a > > powered mic. The powered mic I use from Radio Shack looks like a PC mic > > and > > has a spot under the stand to install two AA batteries. > > > > -----Original Message----- > > From: [mailto:] > > Sent: Wednesday, October 23, 2002 10:46 AM > > To: > > Subject: [c6x] DSK 6711 can it detect condenser mic input? > > > > > > hi all > > > > I am using DSK 6711 fed with a condenser mic (which u get with the > > computer). Its unable to detect the input from mic even after the > > pre-amp > > gain 0f codec is set to 20 dB. > > The codec is set using the control reg. 4. > > > > The mic works fine (I have checked it with windows sound recorder). > > > > Does anybody know whats the problem? > > plz let me know > > > > thank u all |
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Re: FW: DSK 6711 can it detect condenser mic input? - Jeff Brower - Oct 24 16:08:00 2002
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Seshu- > but the condenser mic works for mic-in of the EVM6201(whose > codec provides the same pre-amp 20dB gain). What level is the signal from the mic? Can you measure on dig. scope? If you know the level out from the mic, then you know whether the board + codec can do something useful or not. I'm not familiar with the EVMC6201 board; maybe it has amplifier circuitry the DSK does not. > Also the manual of AD535 says that the codec provides a 2.5/1.5v bias output to support the electret/condenser microphones. It also might be possible that the AD535 gain is not being set correctly. Try setting it to 0 dB and verify your input data is changing. Jeff Brower DSP sw/hw engineer Signalogic > Jeff Brower <>: > > > Seshu- > > > > > But AD535 codec has got the pre-amp for the mic input. > > > Which can give upto 20 dB of gain. > > > > Thats Ok for dynamic mic or other powered-mic, but not enough gain for > > condenser > > mic. Something like 40 dB is needed. > > > > Jeff Brower > > DSP sw/hw engineer > > Signalogic > > > > > > > "Dillon, Tom" <>: > > > > > > > The use of an electret mic on a PC assumes "phantom" power from the > > > > sound > > > > card. The DSK does not have a mic pre amp circuit ... So you need > > to > > > > use a > > > > powered mic. The powered mic I use from Radio Shack looks like a PC > > mic > > > > and > > > > has a spot under the stand to install two AA batteries. > > > > > > > > -----Original Message----- > > > > From: [mailto:] > > > > Sent: Wednesday, October 23, 2002 10:46 AM > > > > To: > > > > Subject: [c6x] DSK 6711 can it detect condenser mic input? > > > > > > > > > > > > hi all > > > > > > > > I am using DSK 6711 fed with a condenser mic (which u get with the > > > > computer). Its unable to detect the input from mic even after the > > > > pre-amp > > > > gain 0f codec is set to 20 dB. > > > > The codec is set using the control reg. 4. > > > > > > > > The mic works fine (I have checked it with windows sound recorder). > > > > > > > > Does anybody know whats the problem? > > > > plz let me know > > > > > > > > thank u all |
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Re: FW: DSK 6711 can it detect condenser mic input? - Author Unknown - Oct 24 16:30:00 2002
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but the condenser mic works for mic-in of the EVM6201(whose codec provides the same pre-amp 20dB gain). Also the manual of AD535 says that the codec provides a 2.5/1.5v bias output to support the electret/condenser microphones. seshu Jeff Brower <>: > Seshu- > > > But AD535 codec has got the pre-amp for the mic input. > > Which can give upto 20 dB of gain. > > Thats Ok for dynamic mic or other powered-mic, but not enough gain for > condenser > mic. Something like 40 dB is needed. > > Jeff Brower > DSP sw/hw engineer > Signalogic > > "Dillon, Tom" <>: > > > > > The use of an electret mic on a PC assumes "phantom" power from the > > > sound > > > card. The DSK does not have a mic pre amp circuit ... So you need > to > > > use a > > > powered mic. The powered mic I use from Radio Shack looks like a PC > mic > > > and > > > has a spot under the stand to install two AA batteries. > > > > > > -----Original Message----- > > > From: [mailto:] > > > Sent: Wednesday, October 23, 2002 10:46 AM > > > To: > > > Subject: [c6x] DSK 6711 can it detect condenser mic input? > > > > > > > > > hi all > > > > > > I am using DSK 6711 fed with a condenser mic (which u get with the > > > computer). Its unable to detect the input from mic even after the > > > pre-amp > > > gain 0f codec is set to 20 dB. > > > The codec is set using the control reg. 4. > > > > > > The mic works fine (I have checked it with windows sound recorder). > > > > > > Does anybody know whats the problem? > > > plz let me know > > > > > > thank u all > > _____________________________________ ------------------------------------------------- Sify Mail - now with Anti-virus protection powered by Trend Micro, USA. Know more at http://mail.sify.com Want to get into IIM? Take the Sify Mock CAT now! http://education.sify.com/mockcat |
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RE: FW: DSK 6711 can it detect condenser mic input? - Dillon, Tom - Oct 24 19:15:00 2002
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Seshu, If you look at the Schematic Page 17 for the EVM (Refer to SPRU305 page B-19) you will see the Microphone preamp circuit formed by the TLC2272ACD op amp and the associated passive components. There is no mic pre amp circuit in the C6711 DSK (Refer to DSK Schematic page 14). Hence, you will need a powered mic for use on the C6711 DSK. Regards,
-----Original Message-----
but the condenser mic works for mic-in of the EVM6201(whose
seshu Jeff Brower <j...@signalogic.com>: > Seshu-
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