PatentDOI
Audio dosage control system
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TLDR
In this paper, the frequency bands to which they are tuned are respectively attenuated so the speaker output does not contain frequencies which exceed permissible limits, when total dosage is trending toward exceeding permissible limits for the time during which the listeners are expected to be listening, the cumulative dose signals operate another attenuator to cause the volume emitted by the speaker to drop to a permissible level.Abstract:
Microphones sample the sound output from the speakers of a sound amplification system. The resulting time domain analog signals undergo a Fast Fourier Transform which yields frequency domain signals representative of the intensities of the frequency bands which compose the sound. The intensities or levels of each band are compared to stored permissible level limits for each frequency band. Attenuators respond to signals indicative of band levels being exceeded by respectively attenuating the frequency bands to which they are tuned so the speaker output does not contain frequencies which exceed permissible limits. The time weighted permissible averages for each frequency are also integrated to provide for production of signals representative of the cumulative sound dosage. When total dosage is trending toward exceeding permissible limits for the time during which the listeners are expected to be listening, the cumulative dose signals operate another attenuator to cause the volume emitted by the speaker to drop to a permissible level.read more
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PatentDOI
Volume regulating and monitoring system
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References
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PatentDOI
Automatic volume adjusting apparatus
TL;DR: In this paper, a volume adjusting device is connected between a sound signal source and a loudspeaker, and a first rectifier circuit for generating a first signal having a D.C. level corresponding to the level of the sound signal supplied from the colume adjusting device to the loudspeaker.
Patent
Automatic time domain equalization of audio signals
TL;DR: In this paper, an equalizer for an audio reproduction system in which equalization is achieved using a discrete time filter is presented. But, it is not shown how to use a microprocessor for generating and storing the filter coefficients in accordance with a perceived acoustic test signal reproduced by the system.
Patent
Automatic equalizing system with DFT and FFT
TL;DR: In this paper, the equalizing arrangement in accordance with the invention comprises an equalizing unit (4) for correcting the frequency characteristic of an electric signal applied to its first input (7) under the influence of a control signal (10) applied to the second input (8) and for supplying a corrected electric signal to its output (9).
Patent
Digital equalizer apparatus enabling separate phase and amplitude characteristic modification
TL;DR: A digital equalizer for audio system applications is based on a FIR (finite impulse response) digital filter whose amplitude and phase/frequency characteristics can be respectively independently established in accordance with input data representing an arbitrary amplitude/frequency characteristic and input phase data from which an arbitrary phase or frequency characteristic for the filter can be derived as mentioned in this paper.
Patent
Automatic volume control
TL;DR: In this article, an automatic volume control for controlling the output volume from a set of loudspeakers in accordance with the noise level in the vicinity of the speakers was proposed, where the output level of the apparatus was set to operate a certain degree above the surrounding noise level and as...