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  • is there a name for setting weak amplitudes to zero?

    From pedro1492@pedro1492@lycos.com to comp.dsp on Fri Dec 6 15:51:23 2019
    From Newsgroup: comp.dsp

    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?
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  • From spope384@spope384@gmail.com (Steve Pope) to comp.dsp on Sat Dec 7 00:11:28 2019
    From Newsgroup: comp.dsp

    <pedro1492@lycos.com> wrote:

    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?

    In audio, that is called a noise gate.

    In radio receivers, that is called a squelch.

    Steve
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  • From theman@theman@ericjacobsen.org (Eric Jacobsen) to comp.dsp on Sat Dec 7 03:35:33 2019
    From Newsgroup: comp.dsp

    On Sat, 7 Dec 2019 00:11:28 +0000 (UTC), spope384@gmail.com (Steve
    Pope) wrote:

    <pedro1492@lycos.com> wrote:

    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?

    In audio, that is called a noise gate.

    In radio receivers, that is called a squelch.

    Steve

    ^^Those. Another that is sometimes used is "sensitivity threshold".

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  • From Piergiorgio Sartor@piergiorgio.sartor.this.should.not.be.used@nexgo.REMOVETHIS.de to comp.dsp on Sat Dec 7 10:55:58 2019
    From Newsgroup: comp.dsp

    On 07/12/2019 00.51, pedro1492@lycos.com wrote:
    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?

    "Dead zone", maybe?

    There is something here:

    https://en.wikipedia.org/wiki/Deadband

    The question is how to come out of
    the "dead zone", by jumping to the
    correct value or ramping up to it.

    bye,
    --

    piergiorgio
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  • From Richard (Rick) Lyons@r.lyons@ieee.org to comp.dsp on Sun Dec 8 01:15:20 2019
    From Newsgroup: comp.dsp

    On Friday, December 6, 2019 at 3:51:27 PM UTC-8, pedr...@lycos.com wrote:
    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?

    In Ohio it's called "putting the kabosh" on the small numbers.
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  • From Marcel Mueller@news.5.maazl@spamgourmet.org to comp.dsp on Mon Dec 9 20:35:33 2019
    From Newsgroup: comp.dsp

    Am 07.12.19 um 00:51 schrieb pedro1492@lycos.com:
    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?

    In Mathematica it is called "Chop". It is mainly used to get rid of
    round-off errors.


    Marcel
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  • From therationalpi@140483@DSPRelated to comp.dsp on Sun Dec 15 09:30:20 2019
    From Newsgroup: comp.dsp

    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?

    "Gating" is the term I'd probably use, but I come from an audio
    background.

    ~Pi


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  • From spope384@spope384@gmail.com (Steve Pope) to comp.dsp on Sun Dec 15 20:33:50 2019
    From Newsgroup: comp.dsp

    therationalpi <140483@DSPRelated> wrote:

    Clipping is when you set a strong amplitude to some fixed limit.
    But what about the other end - when it is small, and those tiny
    amplitudes are replaced by zero?

    "Gating" is the term I'd probably use, but I come from an audio
    background.

    It can also be viewed as a special (degenerate) case of a downward expander.

    Steve
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