Patent
Sound level control equipment
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TLDR
In this article, a variable level adjusting device is used to adjust the level of background noise picked up by a microphone in a coin-operated music system, such as a loudspeaker.Abstract:
Automatic level control equipment, for example for a coin-operated music system, has a sound level adjusting device, such as a variable resistance device (30) interposed between amplifier inputs (23) and outputs (24) for sound reproducing apparatus, such as loudspeakers. The resistance (30) is adjusted by control circuitry (28) to compensate for changes in the level of background noise picked up by a microphone (22). The control circuitry (28) has microphone monitoring filters (25) and amplifier output monitoring filters (27) operable at different frequency bands so that background noise can be monitored at different frequency bands, depending on the frequency distribution of the sound output of the amplifier. If the amplifier has a sound output in the same frequency band as that being monitored in the background noise, the circuitry can switch to a different monitored frequency band of background noise.read more
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References
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PatentDOI
Automatic sound volume control device
TL;DR: In this article, an automatic sound volume control device for use in a device such as a radio or tape player used in a high ambient noise environment is described. But this device is not suitable for the use of audio equipment.
PatentDOI
Noise-dependent volume control having a reduced sensitivity to speech signals
TL;DR: In this paper, the authors proposed a noise-dependent volume control based on repeated measurements of the acoustic signal in the space, which is capable of distinguishing between real background noise and speech in a space.
PatentDOI
Sound reproduction in a space with an independent sound source
TL;DR: In this article, an electronic potentiometer which provides a control function which varies from a signal of high reproduction quality towards a signal which has been subjected to contrast compression and which exhibits a roll-off towards the bass frequencies is used.
Patent
Audible signal generator with automatic volume control dependent on the ambient noise level.
TL;DR: In this paper, an audible signal generator with audio frequency generator (4, 5) and loud speaker (1) is proposed for automatic adaptation of the volume to the environmental noise level, to use the loudspeaker during quiet intervals as a microphone which, during the operating phase, supplies a time-delayed control signal for the amplitude of the audio frequency signal generated by the generator.