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10/02/14 at 13:49:45


1  AUDIO FORUMS / General Discussion and Support / Re: What's spinning?
 on: Today at 13:27:13 
Started by Lon | Post by Lon

2  AUDIO FORUMS / General Discussion and Support / Re: DECWARE Zen Fest 2014 ~ Oct 3rd, 4th, 5th
 on: Today at 04:27:45 
Started by patshrews | Post by Lonely Raven

You'll probably laugh, but I'd love to hear Heart's Little Queen album again. I've not listened to that on vinyl since...'88 or '90.

I can't think of anything else I've been curious about on Vinyl, but I am looking forward to it!

3  SUPPORT FORUMS FOR CURRENT TUBE GEAR / ZMA / Re: Ways to improve sound quality of The MYSTERY AMP !
 on: Today at 04:00:21 
Started by vyokyong | Post by vyokyong
DSD technique[edit]

Comparison with PCM.
SACD audio is stored in DSD, which differs from the conventional PCM used by the compact disc or conventional computer audio systems.

A DSD recorder uses sigma-delta modulation. DSD is 1-bit, has a sampling rate of 2.8224 MHz. The output from a DSD recorder is a bitstream. The long-term average of this signal is proportional to the original signal. DSD makes use of noise shaping techniques in order to push quantization noise up to inaudible ultrasonic frequencies. In principle, the retention of the bitstream in DSD allows the SACD player to use a basic (one-bit) DAC design which incorporates a low-order analog filter. The SACD format is capable of delivering a dynamic range of 120 dB from 20 Hz to 20 kHz and an extended frequency response up to 100 kHz, although most currently available players list an upper limit of 80–90 kHz and 20 kHz is the upper limit of human hearing.

The process of creating a DSD signal is conceptually similar to taking a one-bit delta-sigma analog-to-digital (A/D) converter and removing the decimator, which converts the 1-bit bitstream into multibit PCM. Instead, the 1-bit signal is recorded directly and in theory only requires a lowpass filter to reconstruct the original analog waveform. In reality it is a little more complex, and the analogy is incomplete in that 1-bit sigma-delta converters are these days rather unusual, one reason being that a one-bit signal cannot be dithered properly: most modern sigma-delta converters are multibit.

Because of the nature of sigma-delta converters, one cannot make a direct comparison between DSD and PCM. An approximation is possible, though, and would place DSD in some aspects comparable to a PCM format that has a bit depth of 20 bits and a sampling frequency of 96 kHz.[22] PCM sampled at 24 bits provides a (theoretical) additional 24 dB of dynamic range.

Because it has been extremely difficult to carry out DSP operations (for example performing EQ, balance, panning and other changes in the digital domain) in a one-bit environment, and because of the prevalence of studio equipment such as Pro Tools, which is solely PCM-based, the vast majority of SACDs—especially rock and contemporary music which rely on multitrack techniques—are in fact mixed in PCM (or mixed analog and recorded on PCM recorders) and then converted to DSD for SACD mastering.

To address some of these issues, a new studio format has been developed, usually referred to as "DSD-wide", which retains the high sample rate of standard DSD, but uses an 8-bit, rather than single-bit digital word length, yet still relies heavily on the noise shaping principle. It becomes almost the same as PCM—and is sometimes disparagingly referred to as "PCM-narrow"—but has the added benefit of making DSP operations in the studio a great deal more practical. The main difference is that "DSD-wide" still retains 2.8224 MHz (64Fs) sampling frequency while the highest frequency in which PCM is being edited is 352.8 kHz (8Fs). The "DSD-wide" signal is down-converted to regular DSD for SACD mastering. As a result of this technique and other developments there are now a few digital audio workstations (DAWs) that operate, or can operate, in the DSD domain, notably Pyramix and some SADiE systems.

Another format for DSD editing is Digital eXtreme Definition (DXD), a PCM format with 24-bit resolution sampled at 352.8 kHz (or alternatively 384 kHz).

Note that high-resolution PCM (DVD-Audio, HD DVD and Blu-ray Disc) and DSD (SACD) may still technically differ at high frequencies. A reconstruction filter is typically used in PCM decoding systems, much the same way that bandwidth-limiting filters are normally used in PCM encoding systems. Any error or unwanted artifact introduced by such filters will typically affect the end-result. A claimed advantage of DSD is that product designers commonly choose to have no filtering, or modest filtering. Instead DSD leads to constant high levels of noise at these frequencies. The dynamic range of DSD decreases quickly at frequencies over 20 kHz due to the use of strong noise shaping techniques which push the noise out of the audio band resulting in a rising noise floor just above 20 kHz. The dynamic range of PCM, on the other hand, is the same at all frequencies. However, almost all present-day DAC chips employ some kind of sigma-delta conversion of PCM files that results in the same noise spectrum as DSD signals. All SACD players employ an optional low-pass filter set at 50 kHz for compatibility and safety reasons, suitable for situations where amplifiers or loudspeakers cannot deliver an undistorted output if noise above 50 kHz is present in the signal.

4  SUPPORT FORUMS FOR CURRENT TUBE GEAR / ZMA / Re: Ways to improve sound quality of The MYSTERY AMP !
 on: Today at 03:38:33 
Started by vyokyong | Post by vyokyong
Read from below link of ADC/DAC losses topic from KillerDAC forum.

http://killerdac.com/forum/index.php/topic,2820.0.html

"digital just lacks a certain weight and body that isn't there.  "

As my understanding is that

Bit depth (16 bits, 24 bits and 32 bits) is related to dynamics headroom (from quietest note to loudest note).

Frequency (44.1 MHz, 48 MHz, 88 MHz, 96 MHz, 192 MHz and 384 MHz) is related to resolution or details of music.

But there is no other unit or term to relate or measure of sound WEIGHT and BODY of music recording.

I assume that the more high frequency, the more details of music record but it trades off for MUSIC WEIGHT and BODY. Just like some one hit drum. Slow frequency hits of drum, Weight and body of drum sound is hear clearly. The more high frequency hits of drum, weight and body of drum sound is more thinner. (In condition of same energy or power usage). I think that DAC Chip has limit current out put and circuit power supply to DAC Chip has limit current to supply. The result of oversampling 2X,  4X will result in higher definition (resolution) but lesser of body and weight (than analog recording).

(Normally 2X and 4X oversampling is related to digital filter wall to get rid of noise).

Just my two cents! To think out of box to explain that DSD is more lack of sound weight and body than Redbook standard because DSD uses more higher sampling rate to get more accuracy of sound frequency! But not considering of Sound weight and body.

DSD uses pulse-density modulation encoding—a technology to store audio signals on digital storage media that are used for the SACD. The signal is stored as delta-sigma modulated digital audio; a sequence of single-bit values at a sampling rate of 2.8224 MHz (64 times the CD Audio sampling rate of 44.1 kHz, but only at 1⁄32768 of its 16-bit resolution). Noise shaping occurs by use of the 64-times oversampled signal to reduce noise/distortion caused by the inaccuracy of quantization of the audio signal to a single bit.



5  AUDIO FORUMS / General Discussion and Support / Re: What's spinning?
 on: Today at 03:15:39 
Started by Lon | Post by Lon

6  AUDIO FORUMS / General Discussion and Support / Re: What's spinning?
 on: Today at 03:06:59 
Started by Lon | Post by Lon
My brother Les with Mr. Clark in Austin.


7  AUDIO FORUMS / General Discussion and Support / Re: What's spinning?
 on: Today at 02:28:20 
Started by Lon | Post by Dave1210
Mark...Rolling Stone is suggesting the new Gary Clark Jr Live album is his finest...sounds like you are enjoying it too...

Vinyl seems to be getting better reviews vs. the cd, but my vinyl setup is sitting in storage, so...

2 CD Box will be on its way!

8  AUDIO FORUMS / General Discussion and Support / Re: What's spinning?
 on: Today at 01:56:29 
Started by Lon | Post by mark58
Next LP...


9  AUDIO FORUMS / General Discussion and Support / Re: DECWARE Zen Fest 2014 ~ Oct 3rd, 4th, 5th
 on: Today at 01:42:09 
Started by patshrews | Post by jpv
Can't until this years fest starts. I brought same LPs last year that where a big hit. LR and Palomino what's on your hit list. If I have it on vinyl I'll bring it. I there is anything anybody else wants to hear list it and if available I will bring it.

10  AUDIO FORUMS / General Discussion and Support / Re: What's spinning?
 on: Today at 01:19:16 
Started by Lon | Post by mark58
Next LP...