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BeitragVerfasst: 08.03.2011 14:44 
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Registriert: 12.07.2005 09:47
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I was told the new 2.4.x firmware lets the Hifidelio play high resolution files :shock:

So I tried and copied a few 96kHz / 24 bit FLAC files to the import folder, and played them. So far, everything plays fine :D
In stock condition, I doubt the analog outputs from the HF will benefit from the higher resolution source material.
But as a transport with external DAC, this can be really nice,
though I may have to upgrade my recent 1TB to 2TB yet again, to cope with GB's needed for the high resolution albums :oops:

I haven't tried other formats yet like 44.1/24, 48/24, 88.2/24

I also have no external DAC that shows the actual digital output rate; so does the Hifidelio internally downsample to 44.1/16 ?
Maybe somebody can find out ?

Just to let you guys know.


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BeitragVerfasst: 08.03.2011 15:34 
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Digital-out ist the SPDIF-standard, maximum is 48kHz at 20bit!

Means: yes, the fidel have to downsample for the digital out, a external DAC for toslink/coax (SPDIF) with 96/24 doesnt exist and so there is no way to deliver 96kHz at 24bit from the fidel to an external DAC!

All DAC with higher input rates than 48/20, use a special input like "Denonlink" (RJ45) or Dolby-True-HD (HDMI).

Caused by this, there is even no SACD- or Audio-DVD-player with the high-resolution-signal on an toslink/coax-output!

_________________
http://www.youtube.com/watch?v=sUt99pWvXZE


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BeitragVerfasst: 08.03.2011 15:59 
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Nonsense :D

Typical modern equipment can output 192/24 on coax (RCA, BNC), 96/24 on optical (typically 10~12MHz transmitters are used, like TOTX179).

SACD player like OPPO "creates" a PCM signal from the SACD bit-stream and outputs it as 88/24 on its digital output. This is a typical way to "rip" SACD's to PCM

Actually, I didn't mention SPDIF, as it's spec is old and surpassed by modern implementations.
In fact, the old SPDIF standard mentions 20 bits as typical, but 24 bits are possible.
Data rates are not really specified in the standard, but most old implementations have the normal threesome of 32, 44.1 and 48 kHz
Modern implementations have rates of 88.2, 96, 176.4 and 192 kHz as well.

The days of the Yamaha YM3623B have long gone by some 20+ years or so... :lol:

Similar:
RS-232 for serial port communications is (mis)used nowadays for 9 pins sub D in stead of 25 pins, and baud rates much higher than 9600 (115k or even higher)


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BeitragVerfasst: 08.03.2011 22:15 
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Just google for the AD1981B datasheet and you'll see what the maximum resolution at the digital out of the hifidelio is: 20bit/48khz


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BeitragVerfasst: 09.03.2011 17:33 
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Thanks Gigi,

Seems there's no need to "measure" this.
So the HF can't be a transport for high-res files.

I wonder if they downsample every format to 44.1/16 internally and feed it to the AD1981B for analog output and digital output.

Better would be to keep the bit depth intact up to 20 bits and "downsample" to either 44.1 or 48 kHz. That could be as simple as playing every other sample in a 88.2 or 96 kHz file.


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