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[CAS] Pioneer N70A

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發表於 2015-1-17 00:09:11 | 顯示全部樓層
  
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發表於 2015-1-21 17:51:05 | 顯示全部樓層
本帖最後由 steveha 於 2015-1-21 17:52 編輯

Some updates on discrete R-2R from soekris (wa, it will support DSD on next firmware ) :

So what can the Soekris dam1021 Sign Magnitude R-2R DAC do now:

1) It plays everything over I2S, tested up to 192K but should do 384K.
2) It plays at least to 96K over SPDIF Toslink, and probably up to 192K over SPDIF Coax, but have problems generating test signals as that require software that actually works doing ASIO with channel select, my EMU-0404 use ch 1-2 for analog, ch 3-4 for SPDIF....
3) Automatic detect and support for digital De-Emphasis, for those old CD's.
4) Full set of relative simple and short FIR filters for all rates, but supports filters with up to 1016 coefficients at 48K. Docs and Software Utility to change them included, can also load bypass filters for NOS use. But after seing the ugly spectrum I don't recommend NOS....
5) Digital Volume Control, from -90 to +15 db in 1 db steps, both using a simple potentiometer and control codes over the serial port.
6) Input Selection, Automatic or Manual using control codes over the serial port.
7) Reclocking FIFO with automatic clock tracking works like a charm, syncronize to < 1ppm at anything withing 1% range, and then tracks using a software PLL with 0.02 Hz Lowpass Filter and with 0.02ppm step changes.
8) Tested with 7W toroid transformer. Measured 0.4V PP Ripple on input capacitors, couldn't hear anything but did see 50 hz at -135 db, most likely things going into the measurement cable as it changed when moving things around...
9) Everything can be updated by downloading over a standard PC type serial port.

Functions waiting for next firmware release (which should be soon):

1) DSD Support, should be relative simple, more a question about test setup with software and sound files....
2) Cascading for Digital Crossover use, the 14 pcs IIR Biquads are there (needed one for De-emphasis), and I want the function for my own speakers. If I can figure out how to calculate coefficients without trig functions then it can probably fit into the 32Kbyte in the uC....
3) Cascading for Balanced use.

And whatever I forgot to mention....
__________________
Søren

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發表於 2015-2-2 16:33:14 | 顯示全部樓層
casshan 發表於 2015-2-2 16:20
steveha兄,打算點安裝R2R係N70A入面?

https://hifiduino.wordpress.com/
好似好正, 但好似仲有bug. 有無人有興趣買嚟玩? 可share運費
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發表於 2015-2-3 21:02:46 | 顯示全部樓層
本帖最後由 steveha 於 2015-2-10 00:21 編輯

Just received the DAC today and already made it running (supported all sampling frequency up to 384KHZ).

Not difficult to install.   I am testing it with HDMI-I2S using Beaglebone Black.
All you need are to connect :
1) power supply - 2 x AC 7-9V (4 wires) and  DC 3.3V / Ground (2 wires)
2) I2S (3 wires)
3) RCA RAW out or Buffered SE Out
DSC_5122.JPG
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發表於 2015-2-5 12:39:03 | 顯示全部樓層
本帖最後由 steveha 於 2015-2-5 12:45 編輯

Somemore testings were done using N70A's HDMI I2S.  It seems everything were just fine including  Media Server, Amanero USB. I2S input and Upsampling.  The only complaint is the default volume was set a little bit low so I need to add a 2K potentiometer to increase the digital volume. Also, I have disabled the autodetect of input sources and the only input became I2S.  Tonight, I will move them into the my N70A.
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發表於 2015-2-5 17:54:25 | 顯示全部樓層
本帖最後由 steveha 於 2015-2-5 18:10 編輯

casshan ching

First of all, you need an electronic selector (e.g. TPA OTTO II or even a single chip FST3257G) to switch between two I2S sources.

On N70A,  the USB CM6632A chipset will not be powered on (i.e. by a 3.3v) when you started the player.  It is only powered on when you select USB DAC.  As a result, that 3.3v can be used as a trigger to switch to I2S lines of Amanero USB.

In my setup, the DAC's I2S is connected to the N70A's controller board by default.  However,  when 'USB DAC' is selected the DAC's I2S is switched to the Amanero's I2S lines.  When you select other functions like music player, that 3.3v will be shutdown and the connections will resume back to N70A's controller board.

I2S lines consists 4 wires (instead of 3)  namely : BCLK, FSCLK, DATA and DSD_ON.

Hope this help.
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發表於 2015-2-5 22:27:48 | 顯示全部樓層
本帖最後由 steveha 於 2015-2-5 22:28 編輯

話咁快就已經將份R2R dac 放落部N70A.  It has its own power transformer and the audio out of R2R and ESS9016 were enabled at the same time.
DSC_5124.JPG
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發表於 2015-2-5 22:51:49 | 顯示全部樓層
本帖最後由 steveha 於 2015-2-5 22:55 編輯

嘻嘻,部機個史忽都被我攪到幾傷吓
DSC_5127.JPG

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發表於 2015-2-6 17:29:19 | 顯示全部樓層
本帖最後由 steveha 於 2015-2-6 17:36 編輯

其實唔喺好複雜
我覺得R-2R 把聲非常準確, 不過有D清淡. 可能D resistors 要run-in.
而家加番幾粒Vishay Military Tant 好味好多.
令晚試吓摩其他Cap.
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發表於 2015-2-6 22:12:13 | 顯示全部樓層
收功. Black Gate 行頭, Vishay Tant行尾.
又去了另一Level.
DSC_5130.JPG

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發表於 2015-2-7 16:01:25 | 顯示全部樓層
本帖最後由 rocmanb 於 2015-2-7 16:09 編輯

請問有冇師兄試個佢個耳擴掂唔掂,玩開二昌佬,從未玩過耳機,而家想買部 all in one player 同耳擴,見佢又DSD,又可以用NAS,仲support Spotify 好似好啱心水
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發表於 2015-2-7 16:23:07 | 顯示全部樓層
我成份耳擴飛起咗. 我想吾好期望咁高.

One last point I want to share on R2R.  Finally, I settled down with buffered SE instead of RAW output.  Buffered SE has better gain and dynamics.  
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發表於 2015-2-7 23:47:23 | 顯示全部樓層
steveha ching,
in soekris manual, it said +/-7~15 VDC, but u say 3.3 VDC 2 wires ?  u mean 3.3v dc to j1
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發表於 2015-2-8 00:47:32 | 顯示全部樓層
本帖最後由 steveha 於 2015-2-8 00:53 編輯

As I am using I2S, 3.3V is for the dirty side of ISOLATOR (i.e. ISO +3.3v and ISO GND).   
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發表於 2015-2-10 12:43:30 | 顯示全部樓層
steveha hing,
我見你綠色牛牛output 是9v AC, so far 用落冇問題?因板主話 2x7~8VAC input. 我找不到7~8VAC 牛牛
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發表於 2015-2-10 23:11:38 | 顯示全部樓層
無問題,暫時用住先.
不過已買了7.5VAC.
http://www.ebay.com.hk/itm/12129 ... d=p3984.m1423.l2649

收到後換番.
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發表於 2015-2-11 18:19:59 | 顯示全部樓層
CHING, 請問有WIFI 嗎?
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發表於 2015-2-11 19:54:45 | 顯示全部樓層
好似要加隻USB手指先有WIFI.
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 樓主| 發表於 2015-2-11 20:00:55 來自手機 | 顯示全部樓層
近來發現如果係PCM格式既檔案,用WAV係會比其他如Flac, Aiff 等好聲。主要係動態大左同立體感強左。
就算原生係Flac既Hi-Res file, 我用Monkey Audio 將Flac做WAV, 都係各方面都比原來既Flac好。
大家可以試下。

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發表於 2015-2-12 09:07:31 | 顯示全部樓層
steveha 發表於 2015-2-11 19:54
好似要加隻USB手指先有WIFI.

如果Plug n Play 的話都OK啊。
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