i2s on Raspberry pi 3 model B

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Re: i2s on Raspberry pi 3 model B

Postby hondagx35 » 11 Sep 2016, 17:16

Hi Alex,

However, correct me if I am wrong, this setup of connecting directly to a DAC, although it sounded terrific is only limited to 44.1khz of music and its multiples. 48khz and its multiples does not work

That is not true, my Hifiberry DACs can play all (44,1 and 48kHz) up to 192kHz (this is the current limit on RP).
On the ODROID platform it is possible to use up to 32/384 with the Hifishield.
The problem in your case is, that you do not have a dedicated driver for your DAC.

The end of the line, I think, is to be able to send native dsd over i2s at its highest frequency, you can not go any higher.

You should read this again:
dunghnguyen wrote:At least as what I know, the native DSD signal cannot be transferred via I2S except DoP. Even DoP it depends on the DAC chip. For native DSD it is transferred via USB and depending on DAC chip, we need the respective daughter board as well. In the DSD mode, some additional input pins to be connected to the DAC board for DSD decoding.

DSD over I2S doesn't exist!
The only thing you can do is to use the same hardware (pins) to transfer DSD signals.

Frank
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Re: i2s on Raspberry pi 3 model B

Postby dunghnguyen » 12 Sep 2016, 10:33

hondagx35 wrote:...
That is not true, my Hifiberry DACs can play all (44,1 and 48kHz) up to 192kHz (this is the current limit on RP).
...
Frank


Hi Frank !
I saw your comment as highlighted in red that I had the practical trials on RPi2 / RPi3 connect to USB DAC SMSL M8 (can decode upto DSD128) as below:
1) in Rune menu / MPD with DSD enabled. The M8 display is DSD64 / DSD128 when playing DSD64/DSD128
2) in Rune menu / MPD with DSD disable. The M8 display is 352.8kHz when playing DSD64/DSD128

It means that RPi can play (transport) PCM upto 352.8kHz or even 384kHz sampling rate.
Please correct me if I am wrong.

Thank you.
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Re: i2s on Raspberry pi 3 model B

Postby hondagx35 » 12 Sep 2016, 20:46

Hi dunghnguyen,

I saw your comment as highlighted in red that I had the practical trials on RPi2 / RPi3 connect to USB DAC SMSL M8 (can decode upto DSD128) as below:

I thought you were able to read it in the context of Hifiberry (I2S DACs)!
However, correct me if I am wrong, this setup of connecting directly to a DAC

That is not true, my Hifiberry DACs can play all (44,1 and 48kHz) up to 192kHz (this is the current limit on RP).

This is the limit with I2S on Raspberry Pi, for example read here.
Also read the topic header:
i2s on Raspberry pi 3 model B


ODROID C1 and C2 do not have this limitation.
USB DACs are a totally different story.

Frank
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Re: i2s on Raspberry pi 3 model B

Postby dunghnguyen » 13 Sep 2016, 02:33

I got it ! :)
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