wrt503 发表于 2020-11-2 03:35:05

CSR8675 resampling i2s output.

本帖最后由 wrt503 于 2020-11-2 03:36 编辑

Hello. I have question, maybe you can help me.
Its possible to change resampling of i2s output?

My phone is old, and I have BT 4.2 version. So on i2s output lrclk has 44.1khz , its possible to resample to 48khz?

and if yes, can I have always 48khz or 96khz on i2s output if AG (phone) is 4.2 BT (44.1khz) or 5.0 BT (48khz aptx hd) ?

where I can change this in Sink configuration?



Have a nice day all

423165987 发表于 2020-11-2 09:18:59


wrt503 发表于 2020-11-2 14:54:35

Thanks a lot. Its possible to write higher value than 48000? As I see now 65535 is the limit

saefra 发表于 2020-11-2 16:05:16

混淆了吧？你I2S输出采样应该是单独可配置，和你前面44.1和48应该没强制关系吧？

qushitu 发表于 2020-11-2 16:12:19

不要低于48000

wrt503 发表于 2020-11-2 17:33:11

I need to have one LRCLK for 44.1 and 48khz input.

Without APTX HD there is 44.1khz , with aptx hd is 48khz.

I need to make MCLK generator with one freq to drive AK4490/AK4493 (AK need MCLK, BCLK, LRCLK, DATA).

So Im asking, there is possible to generate 96khz LRCLK i2s output from 44.1/48 AG ? Or 48khz is maximum?

co9 发表于 2020-11-2 17:51:30

wrt503 发表于 2020-11-2 17:33
I need to have one LRCLK for 44.1 and 48khz input.

Without APTX HD there is 44.1khz , with aptx hd ...

8675 may not support 96KHz,since the hardware limit;
I think you should check the datasheet of 8675 firstly.

chzhssr 发表于 2020-11-2 18:17:21

蓝牙的SCLK 用 4 倍频就得到 MCLK 信号 。

wrt503 发表于 2020-11-2 18:27:14

WS Frequency is 96khz, so 96/2 channels its 48khz. I cant find other table with information about max frequency on PCM output

wrt503 发表于 2020-11-2 18:29:24

本帖最后由 wrt503 于 2020-11-2 18:32 编辑

chzhssr Opublikowany 2020-11-2 18:17
Bluetooth SCLK jest mnożony przez 4 w celu uzyskania sygnału MCLK.
Yes, You are right. AK4493 need 256 * Fs, so for 48kHz MCLK should be 12,288MHz or 24,5760MHz

https://ssl.diyaudio.pl/i/24055/8b0031f2124a689969c29eae617c09e3_1604312936.jpg

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