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Topic: some DSP related questions: (Read 3221 times) previous topic - next topic
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some DSP related questions:

has any body come up with any other ideas next to the idea of using discrete wavelets to code transient signals in the time domain for any future references. Does this seem like the option to use, because it looks the most prominent or is it impossible  to even consider other options as well next to all the patents out there? I think of using wavelets as a plus, but I had just been wondering if there had been any other analitical solutions that someone like monty may have came up with?  or are they just going to stick with that option for the future because of the results that it yields in coding efficiency?
budding I.T professional

some DSP related questions:

Reply #1 –
Quote
Originally posted by HotshotGG
has any body come up with any other ideas next to the idea of using discrete wavelets to code transient signals in the time domain for any future references. Does this seem like the option to use, because it looks the most prominent or is it impossible  to even consider other options as well next to all the patents out there? I think of using wavelets as a plus, but I had just been wondering if there had been any other analitical solutions that someone like monty may have came up with?  or are they just going to stick with that option for the future because of the results that it yields in coding efficiency?


I believe there is already experiments done with wavelets. I read the references of a document written by Painter & Spania, and they mention some works beeing done on codecs that use a combination of mdct and wavelet transforms.

check: http://www.mp3-tech.org/programmer/docs/ for more info.

some DSP related questions:

Reply #2 –
 I woudln't be surprised if the MPEG group was doing some preliminary work on there own, I wouldn't find it surprising if they had any ideas or thoughts to use it in there MPEG-4 AAC system as well. I would like to keep things nice and open as possible, the thought of more patents scares the living daylights out of me that's why I asked if there had been any other proposed solutions, I still think though reguardless of what happens future implementations of wavelets for the codec are the obvious way to go, especially in terms of transient coding efficiency.

By the way, these papers do provide some good insite though on various MPEG audio codec and there physcoacoustic models. I think I will keep it as reference later, I would like to see the Vorbis physcoacoustic model mapped out in detail hopefully, mathdogs gives a taste of what the codec is like, but maybe when they get a chance to get around to writing the documentation on the site that gives us some insight on the anaylsis layer there will be a lot more questions answer.
budding I.T professional