Multiband limiter with automatic limiting threshold (ALT) compen

Details Multiband limiter with automatic limiting threshold (ALT) compen Multiband limiter with automatic limiting threshold (ALT) compen

1986-07-10

1989-06-27

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381106, H03G 300

Patent

active

048436267

ABSTRACT:
A multiband audio frequency signal limiting apparatus suitable for use in a wide range of applications is disclosed. An input signal is divided into discrete frequency bands (any practical number is suitable) which are each passed through a separate limited and subsequently summed to obtain an output signal. The summed output signal is fed into an automatic limit threshold circuit which generates a third signal, the Automatic Limit Threshold (ALT) signal, which modifies a common limiting threshold reference for the bands. This causes the bands to limit at a higher or lower threshold level and the band output levels to increase or decrease in direct proportion to the threshold level of limiting. The ALT signal cause the bands to limit at a lower threshold when the energy content of the various bands would combine toward higher values, which could thus generate a larger than desired output signal level. In this way, the summed output signal will be servoed towards one hundred percent level regardless of the input audio frequency bandwidth (and consequently the individual relative band energy content).

REFERENCES:
patent: 4208548 (1980-06-01), Orban
patent: 4249042 (1981-02-01), Orban
patent: 4327446 (1982-04-01), Dressler

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