Audio reproduction utilizing a bilevel switching speaker drive s

Details Audio reproduction utilizing a bilevel switching speaker drive s Audio reproduction utilizing a bilevel switching speaker drive s

1990-08-31

1992-03-10

Shaw, Dale M.

Electrical audio signal processing systems and devices

Monitoring/measuring of audio devices

Loudspeaker operation

395 2, G10L 502

Patent

active

050955098

ABSTRACT:
Speech and other audio output is produced from a digitally driven speaker which is turned on and off by a digital control signal derived from a digitally sampled audio input. Digitally encoded samples of an audio signal are converted to a sequence of bits, 1's and 0's, to control the application of a fixed frequency ultrasonic drive signal to a personal computer speaker. Prior to the signal conversion, the digital samples are compensated utilizing error propagation techniques for audio errors introduced by the conversion from audio levels to full on or full off speaker control bits.

REFERENCES:
patent: 4392018 (1983-07-01), Fette
patent: 4437087 (1984-03-01), Petr
patent: 4592070 (1986-05-01), Chow et al.
patent: 4617645 (1986-10-01), Sprague
patent: 4692941 (1987-09-01), Jacks et al.
patent: 4805220 (1989-02-01), Sprague et al.

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