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Old 18th April 2012, 11:26 AM   #1931
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by Bunpei View Post
According to "FUNCTIONAL BLOCK DIAGRAM" in data sheet of ES9018, DSD signal is processed in "OVERSAMPLING FILTER" block.

1. My interpretation is "no oversampling is applied to DSD data signals in this block".
Do you think it is correct?
I am trying DSD plays these days. I found my previous guess was wrong.
When we play DSD sources, we must use OSF.
I understand the OSF converts 1 bit stream into 6 bit Delta-Sigma modulation format that is acceptable by a DAC segment.
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Old 19th April 2012, 09:23 AM   #1932
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By the way, I made my experiments and found ES9018 can play DSD256 and DSD512 also. AT1201 is one of a few ADC devices that may provide DSD256 output.
What do you mean DSD256 and DSD512? As far as I'm aware there are only two DSD formats available at this time DSD64Fs and DSD128Fs with sampling rate of 2.8224 MHz and 5.6444 MHz accordingly with equivalent data rates.
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Last edited by AndriyOL; 19th April 2012 at 09:25 AM.
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Old 20th April 2012, 12:04 AM   #1933
Bunpei is offline Bunpei  Japan
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Hi, AndriyOL,

As you pointed out, the term neither "DSD256" nor "DSD512" is a formal one. However, I found them in the following pages;
Impulse response: analog, PCM and DSD
exaU2I - Multi-Channel Asynchronous USB to I2S Interface

Bunpei
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Old 23rd April 2012, 04:01 AM   #1934
Bunpei is offline Bunpei  Japan
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I am recently concentrating in playing upsampled DSD256 sources on ES9018 DACs.

Totally six SDTrans384 users in Japan those who connected their players to their own ES9018-based DACs made their independent experiments on the play of DSD256 upsampled sources and they reported they felt a break through excellence in the played music of the upsampled sources.

I am really surprised with superior potentiality of the DAC chip Dustine and his co-workers in ESS Tech produced.
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Old 29th April 2012, 02:41 PM   #1935
Bunpei is offline Bunpei  Japan
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Default Three tips to exploit potential performance of ES9018

These three tips are based on my and co-workers' actual experiences.

1. Providing synchronous master clock of 90.3168 MHz(for 44.1kHz series) or 98.304 MHz(for 48kHz series) for I2S/DSD

2. Applying a high-quality AVCC power supply as much as possible
The type of bypass capacitors included there may effect severely.

3. Playing DSD256 upsampled sources
Even if your original sources are of lower sampling frequencies of PCM or DSD, DSD converted and upsampled DSD256 sources sound better.
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Old 30th April 2012, 08:44 AM   #1936
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>1. Providing synchronous master clock of 90.3168 MHz(for 44.1kHz series) or 98.304 MHz(for 48kHz series) for I2S/DSD

Is the 90MHz/98MHz clock frequency prior to phase noise performance?

>2. Applying a high-quality AVCC power supply as much as possible
The type of bypass capacitors included there may effect severely.

From my experience, Isolation between AVCC_L and AVCC_R makes impact on channel separation.
1.2v VDD ( or 1.2v analogue VDD, maybe ) also seems to be critical.
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Old 1st May 2012, 06:48 AM   #1937
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by wktk_smile View Post
>1. Providing synchronous master clock of 90.3168 MHz(for 44.1kHz series) or 98.304 MHz(for 48kHz series) for I2S/DSD

Is the 90MHz/98MHz clock frequency prior to phase noise performance?
Hi, wktk_smile,

I am afraid that I can't understand your question literally.
Therefore, I guess what your question means.

As you may think, the master clock used should have a good phase noise profile in principle.
If you don't need "OSF mode ON" for DXD, you can use a master clock of lower frequencies.

Bunpei
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Old 9th May 2012, 02:02 PM   #1938
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Quote:
Originally Posted by Bunpei View Post

As you may think, the master clock used should have a good phase noise profile in principle.
If you don't need "OSF mode ON" for DXD, you can use a master clock of lower frequencies.

Bunpei
Thanks for clarification.

I have been listened various upsampled dsd256 sources these days - using SDtrans384 and ES9018 BuffaloII DAC.
Many of those dsd souces gives better textures and extended sound stage deapth.

When converted/upsampled from 16bit/44.1k pcm, sometimes I also got unignorable unnatural
emphasis in certain frequencies alng with above mentioned improvements.

I wonder it might be a difficult task for the conversion software to convert such "non - hirez files" to DSD.
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Old 13th May 2012, 01:36 PM   #1939
Bunpei is offline Bunpei  Japan
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Quote:
Originally Posted by wktk_smile View Post
... Many of those dsd souces gives better textures and extended sound stage deapth.

When converted/upsampled from 16bit/44.1k pcm, sometimes I also got unignorable unnatural emphasis in certain frequencies alng with above mentioned improvements.

I wonder it might be a difficult task for the conversion software to convert such "non - hirez files" to DSD.
I completely agree with you.
Oh, we have introduced one more unintended and complicated parameter set into DSD plays!

Bunpei
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Old 16th June 2012, 09:35 PM   #1940
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Hi - just briefly bumping the thread with a question:

Any of you have datasheets (detailed one) for the ESS9012/9018 and ESS9102 ADC? I'd appreciate seeing the datasheet if possible ...

Best regards,

Jesper
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