Audio loudness control system

Details Audio loudness control system Audio loudness control system

1983-04-11

1984-08-14

Pellinen, A. D.

Electrical audio signal processing systems and devices

Including amplitude or volume control

Automatic

381106, 330136, 330279, 333 14, H03G 320

Patent

active

044661193

ABSTRACT:
An audio loudness control system for processing a broad dynamic range of audio input signals (e.g. 70 to 100 dB) comprises a gain-controlled amplifier, a feed forward control signal generator having an audio signal input that develops a feed forward gain control signal having an amplitude representative of long-term input excursions of the audio signal above a predetermined loudness threshold, a feedback control signal generator having an input from the audio output of the amplifier that develops a feedback gain control signal having an amplitude representative of transient output signal excursions above the loudness threshold, and a selector gate that selects the gain control signal of instantaneously higher effective magnitude and applies the selected gain control signal to the gain control input of the amplifier.

REFERENCES:
patent: 3582964 (1971-06-01), Torick et al.
patent: 3918003 (1975-11-01), Seidel
patent: 4281295 (1981-07-01), Nishimura et al.
patent: 4406923 (1983-09-01), Burne et al.

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