Audio amplifier with voltage limiting

Details Audio amplifier with voltage limiting Audio amplifier with voltage limiting

1989-06-12

1990-03-27

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330124R, 330281, 330295, H23G 902

Patent

active

049124242

ABSTRACT:
A voltage limiting circuit is disclosed for preventing distortion in amplified audio signals. Clipping of the output of a power amplifier is detected and a clipping signal is integrated in a two-step process for limiting a bass frequency gain and limiting a wideband frequency gain which are applied in series. Separate limiting thresholds cause the bass gain to be limited first. Wideband gain is reduced at higher levels of clipping but is more quickly restored when clipping stops. Voltage limiting feedback is provided using inexpensive RC integrator circuits.

REFERENCES:
patent: 3518566 (1970-06-01), Vogel
patent: 3576449 (1971-04-01), Howell
patent: 4048573 (1977-09-01), Evans et al.
patent: 4233566 (1980-11-01), Nestorovic
patent: 4318053 (1982-03-01), Sondermeyer
patent: 4581589 (1986-04-01), Ikoma
patent: 4843626 (1989-06-01), Werrbach
"A Dual-Band Audio Limiter", Noble et al, Journal of the Audio Engineering Society, vol. 17, No. 6, Dec. 1969, pp. 678-684.
TDA7360 Data Sheet.
TDA1524A Data Sheet.

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