Re: [music-dsp] Linearity of compression algorithms on more than one sound component

2015-02-13 Thread Zhiguang Zhang
A low-pass filter codec compression scheme; now that sounds like genuine snake oil to me! On Fri, Feb 13, 2015 at 7:02 PM, Theo Verelst theo...@theover.org wrote: Ian Esten wrote: It's lossy. Definitely not linear. Right, it's not linear, because probably there are quantization

Re: [music-dsp] Linearity of compression algorithms on more than one sound component

2015-02-13 Thread Zhiguang Zhang
On a serious note, this may already be employed in hardware samplers.  I couldn’t find much info on it.  SNES and Playstation store samples in a compressed ADPCM format. http://en.wikipedia.org/wiki/Bit_Rate_Reduction On Thu, Feb 12, 2015 at 3:02 PM, Theo Verelst theo...@theover.org wrote:

Re: [music-dsp] Linearity of compression algorithms on more than one sound component

2015-02-13 Thread Theo Verelst
Ian Esten wrote: It's lossy. Definitely not linear. Right, it's not linear, because probably there are quantization differences for absolute volume differences, and surely, frequency components are approximated, and there is a maximum in information that it can put in the encoded output,

Re: [music-dsp] Linearity of compression algorithms on more than one sound component

2015-02-13 Thread Ian Esten
Lossy encoding wouldn't necessarily be non-linear in all cases. Of course it is non-linear. Lossy encoding does not satisfy the conditions of linearity: f(a + b) = f(a) + f(b) f(a.b) = a.f(b) -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive,

Re: [music-dsp] Linearity of compression algorithms on more than one sound component

2015-02-13 Thread Zhiguang Zhang
BTW, what does linearity have to do with implementing compressed audio into samplers?  Why not just include a decoder upon playback? On Fri, Feb 13, 2015 at 7:56 PM, Ian Esten i...@ianesten.com wrote: Lossy encoding wouldn't necessarily be non-linear in all cases. Of course it is non-linear.

Re: [music-dsp] Linearity of compression algorithms on more than one sound component

2015-02-12 Thread Ian Esten
It's lossy. Definitely not linear. On Thu, Feb 12, 2015 at 4:33 PM, robert bristow-johnson r...@audioimagination.com wrote: On 2/12/15 3:02 PM, Theo Verelst wrote: Hi all, Just a thought I share, because of associations I won't bother you with, suppose you take some form of audio

Re: [music-dsp] Linearity of compression algorithms on more than one sound component

2015-02-12 Thread robert bristow-johnson
On 2/12/15 3:02 PM, Theo Verelst wrote: Hi all, Just a thought I share, because of associations I won't bother you with, suppose you take some form of audio compression, say Fmp3(wav) which transforms wav to an mp3 form, with some encoding parameters. Now we consider the linearity of the