Electrical audio signal processing systems and devices – Monitoring of sound – Amplification control responsive to ambient sound
Patent
1989-11-14
1991-09-03
Isen, Forester W.
Electrical audio signal processing systems and devices
Monitoring of sound
Amplification control responsive to ambient sound
381 72, 381108, H03G 320
Patent
active
050461010
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.
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Isen Forester W.
Lovejoy Controls Corp.
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