Loudness control circuit for an audio device
AssigneeYamaha Corporation
InventorShigenobu Kimura
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Abstract
A loudness control circuit for an audio device used in a reproduction circuit for reproducing a music signal recorded on a recording medium comprises one or plural level detection circuits for detecting levels of signal components of low and high frequency regions of a reproduced signal and control circuits for controlling the levels of the signal components of low and high frequency regions of the reproduced signal in response to outputs of the level detection circuits. The level control is made in accordance with a sound-pressure level for each frequency region of a reproduced signal so that an optimum compensation of the level in response to the sound-pressure level becomes possible.
Claims8
A loudness control circuit for an audio device used in a reproduction circuit for reproducing a sound signal recorded on a recording medium comprising:
- level detection means for detecting a level of a signal component, in a plurality of predetermined frequency regions, of a reproduced signal, the level detection means including filter means for passing a frequency component of at least one of the plurality of predetermined frequency regions and a level detection circuit connected to the filter means for computing an average value of an output level of the filter means during a predetermined period of time;
- and
- control means for controlling the level of said signal component of said reproduced signal in response to outputs of said level detection means, wherein the level detection circuit supplies the average value to the control means each time the constant period of time has elapsed.
Dependencies are inferred from the claim text.