Adobe Audition 1.5 allows WMA monoaural audio at 44.1 KHz sample-rate with a bit-rate of 20 kbps

Discussion in 'Windows Media Player' started by Radium, Jul 17, 2007.

  1. Radium

    Radium Guest


    Adobe Audition 1.5 allows WMA monaural audio at 44.1 KHz sample-rate
    with a bit-rate of 20 kbps. How does it do this? How can the bit-rate
    be less than the sample-rate?

    In a monaural WMA file that is 44.1 KHz sample rate, what is the
    minimum bit-rate that is mathematically-required? Can it be compressed
    to 1-bit-per-second while still retaining the 44.1 KHz sample-rate? If
    so, then how? If not, then why?

    What version of WMA does Adobe Audition 1.5 use?

    Also, why do WMA artifacts sound different from MP3 artifacts? What is
    the mechanism behind WMA compression that gives WMA its characteristic

    I like WMA-specific audio artifacts. All non-WMA digital audio
    compressions that are below 320 kbps and/or below 44.1 KHz-sample-
    rate, and/or non-monaural sound like stinky human fart. Or an angry
    infant foaming at the mouth.

    The only digital audio compression I like is WMA. The sounds resulting
    from WMA compression sort of make me think of those RF electronic
    telecommunication devices used in The Bourne Identity. That movie
    features some really awesome devices that make those interesting
    sounds - for example, when the main character is getting his hand
    screened. I also associate these sounds with the electronic
    telecommunication devices used by the Soviet Union. Soviet Union has
    got some really psychedelic sounds in their electronics. You know,
    those fancy dial-up modems tones?

    All digital audio compression formats other than WMA, stink badly!!

    Here are my rules for digital audio:

    A. Whether compressed or not, the audio must be monaural and with a
    sample-rate of at least 44.1 kHz.

    B. The only compression allowed is WMA. No other compression format is

    C. In its uncompressed form, the audio must have a bit-resolution of
    at least 16-bit

    D. If compression is used, then the sample-rate of the compressed and
    the uncompressed version of the audio must be the same.

    E. If compression is used, the only thing that should be decreased is
    the bit-resolution. The sample-rate must remain unchanged

    Let's say a song that was originally recorded in stereo is given to
    me. The song must to be converted to mono* via the following steps:

    1. Record audio from CD [or other stereo audio source] into Wavelab,
    Adobe Audition [or other audio software] into a file. For simplicity
    let's call this file "Track1.wav"

    2. Make a copy of Track1.wav and save the copy as "Track1B.wav"

    3. Open Track1.wav and reduce the gain of its audio by 77.5%

    4. Convert Track1.wav to monaural audio

    5. Save Track.1

    6. Open Track1B.wav and reduce its audio gain by 50%

    7. Invert the phase of the left channel of Track1B.wav

    8. Convert Track1B.wav to mono

    9. Save Track1B.wav

    10. Create a new stereo wave file whose bit-resolution is 16-bit and
    sample rate is 44.1 kHz. For simplicity let's call this file

    11. Copy and paste the audio of Track1.wav into the left channel of

    12. Copy and paste the audio of Track1B.wave into the right channel of

    13. Convert untitled.wav to mono

    14. Save untitled.wav

    *Songs that were originally-recorded in stereo need to be converted to
    mono via the above 14 steps because different sounds are recorded
    differently in the L and R channels. The audio that is originally
    panned to the center is significantly louder than the audio whose
    phase is different in the left & right channels. This is why I reduce
    the loudness of non-inverted stereo audio file by 77.5% [before
    converting it to mono].

    In the stereo file whose left channel has its phase inverted, I
    decrease the loudness only by 50% and then convert it to mono. Usually
    -- the lead vocals, bass, and percussion are recorded identically in
    both the left and right channels. The piano, chorus, guitar, and synth
    pads are usually recorded differently in the left and right channel.
    Radium, Jul 17, 2007
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  2. Radium

    Jim Leonard Guest

    Because the two are not related. The short answer is that the WMA
    encoder will throw away many frequencies to fit into a 20kbps target.
    (over 95%, I'd imagine). The output will be 44.1KHz but much of the
    frequency content will have been removed.
    WMA encoding is a lossy process, so there is no "minimum". The
    "minimum" is whatever bitrate it takes to sound exactly the same (ie.
    "transparency") to you as the original. It is a subjective process,
    which is why there is much debate over "optimal" bitrates.
    Jim Leonard, Jul 17, 2007
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  3. Why do people continue to feed this notorious troll?
    Richard Crowley, Jul 17, 2007
  4. Arnii, did you skip breakfast again?
    That's not hope, Turdy. In case you forgot, the Resistance tapped into
    your ocular implant's feed. Here's a still shot from one of your forays
    into the "spring":
    George M. Middius, Jul 17, 2007
  5. Radium

    Radium Guest

    Or maybe the M$ is keeping it top secret ;-)

    BTW, I forget to mention that this WMA monaural audio at 44.1 KHz
    with a bit-rate of 20 kbps uses a CBR bit-rate. IOW, the bit-rate of
    the file never changes, unlike VBR. I don't like VBR because its
    artifacts are not as strong as in CBR. In VBR, the artifacts seems to
    be on/off, sometimes more prominent, other times weaker.
    Radium, Jul 18, 2007
  6. Radium

    dpierce Guest

    I can represent a 1 volt 1 kHz sine wave lasting
    25 days in absolutely perfect fidelity with no
    distortion whatsoever in less than 800 bits total.
    If you please, that comes to less than 1.3 nits/sec.
    It's broken in different ways, and people misuse
    and abuse it in different ways.
    Nobody cares.
    About which we can safely bet you know absolutely
    nothing and have, in fact, never once heard.
    Really, NOBODY cares, not the least for the fact that
    you have not a clue what you're talking about.
    dpierce, Jul 18, 2007
  7. Radium

    Radium Guest

    Huh? Don't those sounds give you an enjoyable psychedelic feeling?
    Radium, Jul 21, 2007
  8. Radium

    Eeyore Guest

    Why don't you boil your head in a vat of acid ?

    Eeyore, Jul 21, 2007
  9. Radium

    dpierce Guest

    They are annoying, boring and utterly unenjoyable, just
    like you are. But you bring the added dimensions of stupid
    and pointless to the table.
    dpierce, Jul 21, 2007
  10. Poopie recycles himself.
    Why don't you come up with a different retort, Poopie? You're stuck in
    the same groove for the past 20 years.
    George M. Middius, Jul 21, 2007
  11. Not as much as *plonking* your inane drivel.

    "As human beings, we understand the world through simile, analogy,
    metaphor, narrative and, sometimes, claymation." - B. Mason
    Steven Sullivan, Jul 22, 2007
  12. Radium

    Jim Leonard Guest

    No, as we're not all autistic as you are. I say this not as a slam,
    but as someone who has an autistic family member and understands your
    condition. (It's also the reason I'm probably the only one responding
    sanely to your posts.)
    Jim Leonard, Jul 23, 2007
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