Electrical audio signal processing systems and devices – With amplifier
Patent
1987-07-20
1988-09-20
Birmiel, Howard A.
Electrical audio signal processing systems and devices
With amplifier
330 10, H03F 338
Patent
active
047730960
ABSTRACT:
The present invention is a digital switching power amplifier particularly adapted for generation of a high power output from a digital input signal. The digital input signal, comprising a series of M bit digital words at a predetermined sampling rate, is compared with a digital ramp signal which counts through the range from zero to 2.sup.M. A similar second comparison is made between an inverted digital input signal and the digital ramp signal. These comparisons control separate application of one of two polarities of a DC power source to corresponding terminals of the load device. The net voltage coupled to the load is a two polarity pulse width modulated signal corresponding to the digital input signal. In an alternative embodiment the second comparison is between the digital input signal and a digital ramp signal of the opposite slope. In a further embodiment a digital signal source, such as a compact disk player or digital tape recorder, is included with a digital encoder, a similar encoder for an analog input signal and a switch device to select the analog or the digital encoder for driving the load.
REFERENCES:
patent: 4240036 (1980-12-01), Kohler
patent: 4371840 (1983-02-01), Yokohama
patent: 4404526 (1983-09-01), Kirn
patent: 4415862 (1983-11-01), Kunugi
patent: 4703283 (1987-10-01), Samuels
patent: 4725788 (1988-02-01), Lodahl
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