Direct digital loudspeaker

Details Direct digital loudspeaker Direct digital loudspeaker

1982-09-23

1985-05-07

Rubinson, Gene Z.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340347DA, H04R 1902, G08C 902

Patent

active

045159971

ABSTRACT:
A method of and apparatus for converting a digital signal to sound, the digital signal being encoded in a sequence of code words at a signal encoding frequency, the code words representing the analog sound pressure of an original audio signal, with decoding of the digital signal occurring after electro-acoustic transduction through mechanical rectification and characteristics of a listener's ear, includes utilizing a plurality of substantially identical sound pressure generating elements each having an individual driver associated therewith, and selectively energizing the drivers in a pulsed manner at the signal encoding frequency in combination in response to a respective order of the bits of each code word of a digital signal from a most significant bit to a least significant bit. The sum of the air pressures produced by the sound pressure generating elements in response to each of the successive code words of the digital signal has a magnitude corresponding to the analog value of the respective code word, and the auditory system of the listener has the characteristics of a low pass filter whereby the listener receives the sum of the air pressures as the analog sound pressure of the original audio signal.

REFERENCES:
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patent: 3626096 (1971-12-01), von Muench
patent: 3947708 (1976-03-01), Fulenwider
patent: 3958237 (1976-05-01), Fulenwider
patent: 4034332 (1977-07-01), Alais
patent: 4122302 (1978-10-01), Bobb
patent: 4194095 (1980-03-01), Doi et al.
patent: 4332979 (1982-06-01), Fischer

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