Automatic loudness control circuit

Details Automatic loudness control circuit Automatic loudness control circuit

1988-04-12

1991-01-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Including frequency control

Automatic tone control

381 28, H03G 900

Patent

active

049824350

ABSTRACT:
An automatic loudness control circuit for automatically controlling the magnitude of boosting of the low-frequency component of an audio signal in accordance with the output signal level of a power amplifier for driving a loud-speaker. The low-frequency component of the output signal from an audio signal source is boosted by a low frequency boosting circuit to prepare a low-frequency boost signal, which is then added to the output signal of the source, and the resulting signal is fed to the power amplifier. The magnitude of boosting by the boosting circuit is controlled according to the output level of the power amplifier and is therefore increased as the output level lowers. Consequently, the circuit assures optimum loudness control at all times, permitting the loudspeaker to produce dynamic sounds.

REFERENCES:
patent: 4186273 (1980-01-01), Dodson
patent: 4503554 (1985-03-01), Davis
patent: 4748669 (1988-05-01), Klayman

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