Dsp Nominal Signal Level For Audio?

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1

Hi i have a question about the minimum and maximum voltage level that my DSP receiver must take. So i have a wireless system with one transmitter consisting of mixers lna l.o sending data to a receiver, that is like the attached image. The dsp reveiver take a signal that is downconverting to 10khz around...

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I have read (don't know if it is right) that the DSP's input is a line in, with impedance typically around 10K?.

Also the nominal signal level at DSP input must be around 1 volt peak to peak. So what is this ? if i give 0.1 volt the DSP will not work? if i give 2 volt what?

i send an jpg data of bandwidth 14Khz.

My DSPtransmitter is TMS 3220 C6416 DSK and the receiver is TMS 3220 C6713 DSK

tHANks

2

Post it at TI's ARM & DSP Microprocessors (DSP) forum?

3

i found the integrated that make the ADC and DAC . is is AIC23 CODEC

http://www.ti.com/lit/ds/symlink/tlv320aic23b.pdf

at page 2-2 i read that: Line Input to ADC Input signal level (0 dB) 1 V RMS

at page 2-1 says about the supplies.it has several supplies..

so to work with efficiency i must feed this DSP with 1 V (rms).

if i feed it with 0.5 or 1.5 maybe more BER comes ?

4

Fovakis:
i found the integrated that make the ADC and DAC . is is AIC23 CODEC

http://www.ti.com/lit/ds/symlink/tlv320aic23b.pdf

at page 2-2 i read that: Line Input to ADC Input signal level (0 dB) 1 V RMS

at page 2-1 says about the supplies.it has several supplies..

so to work with efficiency i must feed this DSP with 1 V (rms).

if i feed it with 0.5 or 1.5 maybe more BER comes ?

The full scale input is 1V rms, so you really want to provide less than this, otherwise you'll clip.
Without seeing the signal in question I can't estimate the peak voltage to rms voltage ratio, but
you want to ensure the peak voltage is less than +/- 1.4V to avoid clipping.

The sigma-delta converter has plenty of bits, I doubt you'll see degradation if you provide only 0.1V input,
there's still oodles of precision left.

5

MarkT:

Fovakis:
i found the integrated that make the ADC and DAC . is is AIC23 CODEC

http://www.ti.com/lit/ds/symlink/tlv320aic23b.pdf

at page 2-2 i read that: Line Input to ADC Input signal level (0 dB) 1 V RMS

at page 2-1 says about the supplies.it has several supplies..

so to work with efficiency i must feed this DSP with 1 V (rms).

if i feed it with 0.5 or 1.5 maybe more BER comes ?

Without seeing the signal in question I can't estimate the peak voltage to rms voltage ratio, but
you want to ensure the peak voltage is less than +/- 1.4V to avoid clipping.

i don't understand this sentence :drooling_face:
Less that +/- 1.4 volt of what do you mean ? :stuck_out_tongue:

ok maximum input 1 vrms maybe depends on AVDD=3.3 Volt.

the minimum AVDD=2.7 volt at 2-1 page. so minimum input maybe approximately 0.7rms..??

what is the minimum input voltage??????

I have already an active filter before DSP receiver but the gain is not capable to work efficiently the ADC.(i give only 35mV rms.)

So i will make an non-inverting oper.amp with potentiometers ?will it work? my signal's bandwidth is 14Khz