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looking for audio (compression) project

Discussion in 'Misc Electronics' started by Elmo Breinschmid, Oct 2, 2008.

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  1. Hi folks,

    I am looking for a challanging topic for an audio project in my university
    lab. MP3 and AAC encoder implementations have already been developed there
    (in software). These should form the basis for further developments. On a
    time and material basis the complexity may be quite large, for the time plan
    is laid out for 1 year!

    Thus, I am looking for people who are interested in audio technology and
    software design. It would be great if you could bring in your own experience
    and own ideas.

    I appreciate any kind of proposals, suggestions, criticism and assistance!

    Thank you all.

  2. Are you interested in a purely software project or more of a hardware/
    software oriented project?

    More on the hardware side you might like to say implement a massively
    parallel MP3 audio processing system on an FPGA.
    E.g. have a separate processor soft core for each MP3 channel, and
    provide a means to have some sort of user defined processing done on
    each MP3 encoded stream. i.e. MP3 encoding + processing or some sort
    (filters, effects, whatever).
    Perhaps make use of C-to-hardware compilers to convert some of the C
    code to hardware to improve performance.

    Don't just think big though, small can be good too. How about an MP3
    encoder/decoder using a tiny 8 pin PIC or something. Hand optimised
    assembler, single chip solution = neat.

  3. linnix

    linnix Guest

    Do they make 100MHz PIC?
  4. They have already suggested 1001 algorithm for the quality audio
    compression. All of those algorithms offer somewhat 30% better
    compression for the same quality compared to MP3, for the cost of the
    several times more of computing burden. All of those algorithms are
    based on either ATC or forward/backward LPC with vector coding.
    This area is also one of the most heavily patented, so you can't write a
    line of code without infringing somebody's intellectual rights.
    What for? The main advantage of MP3 is that it is widely accepted. The
    30% gain is not worth incompatibility and increased computing needs.
    Find the different area for your enthusiasm.

    Vladimir Vassilevsky
    DSP and Mixed Signal Design Consultant
  5. The latest AAC implementation already offers a 75% quality improvement
    over MP3 at the same bitrate and is probably the final audio format
    we'll ever see. On the other hand, people thought the same about MP3
    10 years ago, so maybe I'm just a narrow-minded prick. But it's
    finalized in terms of the concept it uses to compress audio, which is
    just an extended version of MP3, and it won't improve beyond that.

    You need to focus on a concept that intelligently recognizes and
    discerns different elements in the audio and encodes them efficiently
    (hint: MIDI) For singing, the application analyzes the primary
    characteristics of the person's voice: the resonance, pitch etc.
    stores that in the header followed by instructions on the words he
    speaks, the volume, the length, whatever. It should be prevalent in
    about 20 years.
  6. Guest

    I'd concentrate on some other end of the market, like low bit rate
    speech encode/decode. I think the present day solutions are piss poor
    at best. The phone and digital radio companies have spent fortunes on
    such technology, but with low latency in mind since they have to work
    real time. A voice encode/decode scheme designed for archive (latency
    be damned!) would be useful. There are all sorts of voice applications
    that are stored for eons to cover one's butt, such as public service
    telephony, stock trades, digital black boxes in aircraft, and probably
    NSA taps.
  7. Do your classmates all have leprosy, or what? =:-O
  8. Senix do (or did) with the SX processor.

    PIC was just an example, the idea being to get a MP3 encoder or
    decoder in the minimum hardware possible.
    Or how about an MP3 decoder using 7400 series logic? :->

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