Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

help to understand the protocol pcm

hi Please I'd like to know how the protocol works pcm (pulse code modulation), ie how to transfer data or how to receive data with details thank you
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi Radouane,

There is alot around.

In principle it is just ADC/DAC realy. i.e. quantise signal(audio) through ADC then pass in channel thn recover by DAC. Coding of DAC/ADC levels are nonlinear. You got codec on your board, use it, thats all in principle, just

DAC/ADC utilised as long comm technique for audio(telephone)

ADC/channel/DAC one direction

ADC/channel/DAC opposite direction

The analogue audio input will need LPF(anti-alias)

The analogue output signal will need LPF(anti-image)