Extract HDCD, How I Can extract HDCD by software? Options

[SCIF]

How I Can extract HDCD by software(EAC, WMP9...)?

[adlai]

I was always under the impression that HDCD was simply a better dithering algorithm.

[SebastianG]

I was always under the impression that HDCD was simply a better dithering algorithm.

HDCD is:
1) dithering + noise shaping
2) peak compression (kind of a reversible dynamic compressor)
3) hiding commands in some least significant bits of the samples to tell an HDCD decoder which anti-alias lowpass filter it has to use for upsampling

...whereas most of the dynamic range "increase" comes from (1).
("increase" ? yes, it depends on how you measure it. If you perceptually weight the quantization noise the noise power will be lower compared to dithering without noise shaping)


SebastianG

This post has been edited by SebastianG: Jan 28 2005, 19:11

[ProtectYaNeck36]

I was always under the impression that HDCD was simply a better dithering algorithm.

HDCD is:
1) dithering + noise shaping
2) peak compression (kind of a reversible dynamic compressor)
3) hiding commands in some least significant bits of the samples to tell an HDCD decoder which anti-alias lowpass filter it has to use for upsampling

...whereas most of the dynamic range "increase" comes from (1).
("increase" ? yes, it depends on how you measure it. If you perceptually weight the quantization noise the noise power will be lower compared to dithering without noise shaping)


SebastianG

I just came across this post and I had a question for. #2 threw me off when you said "reversible dynamic compressor." are the signal peaks actually compressed (or limited?) or is it a compressor acting as an expander (the "reversible" part is what lead me to believe you were describing a compressor reversed)?