digital audio interface inside a discman

takashi · 3rd March 2003, 04:11 PM

do any one use the sdata, lrclk and bclk in a discman to feed into a dac?
i am trying to do with a sony discman--D-E805

it use a sm5902 esp chips, i have make it in bypass mode, that means the audio data will not go into the DRAM. and i find that there is a crystal/ oscillator --16.9Mhz beside it.

i have use a scope to check those digital audio in/out pin on sm5902, the Bclk is not 2.8XXMhz, its 2.11XXMhz, but the LRclk is 44.1Khz.

do anyone have expensice in discman? do the bclk divided by that crystal/ oscillator or just generated in the CD servo/DSP...

do any have some referance sch./ block diagram of discman?

thanks

takashi · 4th March 2003, 12:12 PM

today i have make it work!
i have use a 38.8688Mhz crystal and use DF1704 divided it by 2 and feed to the discman. and then i use the Sdata, Bclk and LRclk from the discman as the audio interface to DF1704. the sound is produced by the pcm1704!

but i still want to find out the reson why the Bclk is 2.11Xmhz (44.1khz X 48) and not 2.82XXmhz (44.1khz X 64).........

fcserei · 4th March 2003, 03:22 PM

EIAJ (and now the I2S too) chipsets are almost exclusively 48 Fs BCLK.

Older I2S chipsets used the 64 Fs clock only

3rd March 2003, 04:11 PM	#1
takashi diyAudio Member Join Date: Nov 2002 Location: somewhere	digital audio interface inside a discman do any one use the sdata, lrclk and bclk in a discman to feed into a dac? i am trying to do with a sony discman--D-E805 it use a sm5902 esp chips, i have make it in bypass mode, that means the audio data will not go into the DRAM. and i find that there is a crystal/ oscillator --16.9Mhz beside it. i have use a scope to check those digital audio in/out pin on sm5902, the Bclk is not 2.8XXMhz, its 2.11XXMhz, but the LRclk is 44.1Khz. do anyone have expensice in discman? do the bclk divided by that crystal/ oscillator or just generated in the CD servo/DSP... do any have some referance sch./ block diagram of discman? thanks

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4th March 2003, 12:12 PM	#2
takashi diyAudio Member Join Date: Nov 2002 Location: somewhere	today i have make it work! i have use a 38.8688Mhz crystal and use DF1704 divided it by 2 and feed to the discman. and then i use the Sdata, Bclk and LRclk from the discman as the audio interface to DF1704. the sound is produced by the pcm1704! but i still want to find out the reson why the Bclk is 2.11Xmhz (44.1khz X 48) and not 2.82XXmhz (44.1khz X 64).........

4th March 2003, 03:22 PM	#3
fcserei diyAudio Member Join Date: Sep 2002 Location: US	EIAJ (and now the I2S too) chipsets are almost exclusively 48 Fs BCLK. Older I2S chipsets used the 64 Fs clock only

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