Amplifiers – Modulator-demodulator-type amplifier
Patent
1986-06-13
1988-02-09
LaRoche, Eugene R.
Amplifiers
Modulator-demodulator-type amplifier
330284, H03F 338
Patent
active
047243961
ABSTRACT:
A digital amplifier contains a circuit for converting the onset of a clipping condition into a missed pulse in a pulse width modulated pulse train generated from an analog signal and an improved circuit for producing a control voltage proportional to the extent of the clipping condition, which circuit includes a pulse counter for counting a predetermined number of missed pulses in the pulse train and a voltage generator for producing a voltage proportional to the extent of clipping when said predetermined number of missed pulses occurs. The generated voltage is applied to an attenuator for attenuating the analog input signal.
REFERENCES:
patent: 4178556 (1979-12-01), Attwood
patent: 4600891 (1986-07-01), Taylor, Jr. et al.
Audio, vol. 47, No. 6, Jun. 1963, pp. 24,26,28,30,49,50; US, G. F. Cooper: "Class D Amplifiers."
Journal of the Audio Engineering Society, vol. 31, No. 11, Nov. 1983, pp. 842,853; New York, US; B. E. Attwood: "Design Parameters Important for the Optimization of Very-High-Fidelity PWM (Class D) Audio Amplifiers."
Patents Abstracts of Japan, vol. 1, No. 153, Dec. 8, 1977, p. 8109 E 77 & JP-A-52 94 761 (Sony K.K.) 08-09-1977.
Hand Larry E.
Taylor, Jr. Wilson E.
LaRoche Eugene R.
Mottola Steven J.
Peavey Electronics Corporation
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