Electrical audio signal processing systems and devices – Noise or distortion suppression – Interpolation
Patent
1984-11-05
1987-03-10
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Noise or distortion suppression
Interpolation
330127, 330251, 381 99, 381111, 381120, 381121, H04R 304, H04R 102, H03F 3217
Patent
active
046495657
ABSTRACT:
A device for converting an electric signal into an acoustic signal, which comprises an electro-acoustic transducer unit (2) having a quality factor (Q) less than unity. The device further comprises an amplifier circuit (3) for driving the transducer unit. The amplifier circuit has a frequency-dependent gain characteristic (6) which increases towards the lower frequencies, starting from f.sub.2, in a frequency range between a first and a second frequency (f.sub.1 and f.sub.2), f.sub.1 being the resonant frequency of the transducer unit (2) and f.sub.2 being greater than f.sub.1. The efficiency can be increased if amplifier the circuit includes a special amplifier such as a switched amplifier, for example, a class-D amplifier, or an amplifier with a power supply that provides a DC voltage that depends on the drive level of the amplifier.
REFERENCES:
patent: 3478275 (1969-11-01), Walker
patent: 3715501 (1973-02-01), Russell
patent: 3988541 (1976-10-01), Boast
patent: 4118600 (1978-10-01), Stahl
patent: 4481662 (1984-11-01), Long et al.
International Journal of Electronics, "A Pulse Width Modulated Amplifier", Gok et al., vol. 30, No. 6, 1975 pp. 593-604.
Kaizer Adrianus J. M.
Sangster Frederik L. J.
Wesche Cornelis A. M.
Byrd Danita R.
Franzblau Bernard
Mayer Robert T.
Rubinson Gene Z.
U.S. Philips Corporation
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