Electrical audio signal processing systems and devices – Including amplitude or volume control
Patent
1989-12-21
1992-09-22
Isen, Forester W.
Electrical audio signal processing systems and devices
Including amplitude or volume control
340636, H03G 300
Patent
active
051504154
ABSTRACT:
A volume control circuit for an audio transducer comprises a driver circuit driven by a first pulse rate signal to excite the audio transducer and render an audio signal at a desired volume and audio frequency corresponding to the first pulse rate signal, and a control circuit selectively activated to pulse modulate the excitation of the audio transducer during its pulsed excitation periods to alter the volume of the audio signal rendered by the audio transducer. In one embodiment, the control circuit includes a logical AND gate having as one input the first pulse rate signal and as another input a selected signal of either a second pulse rate signal or a signal representative of a logical one, the AND gate selectively activated to pulse rate modulate the first pulse rate signal with the second pulse rate signal which is preferably ultrasonic. In another embodiment, the AND gate may be coupled to a variable pulse rate signal to pulse rate modulate the first pulse rate signal to render the audio signal at a volume commensurate with the varied pulse rate. Various other alternate embodiments of the present invention are described all including the foregoing described volume control circuit.
REFERENCES:
patent: 4178556 (1979-12-01), Attwood
patent: 4205578 (1980-06-01), Bagus
patent: 4314236 (1982-02-01), Mayer et al.
patent: 4382251 (1983-05-01), Fujisawa
patent: 4396909 (1983-08-01), Suzuki
patent: 4476436 (1984-10-01), Koizumi et al.
patent: 4603317 (1986-07-01), Gailbreath et al.
patent: 4694725 (1987-09-01), Seevers et al.
patent: 4797932 (1989-01-01), Rohulich et al.
patent: 4803437 (1989-02-01), Reusens
National Semiconductor, LB18-1, "+5 to -15 volts DC converter", Jul. 1972.
DeLuca Michael J.
Jaffee James I.
Berry Thomas G.
Ingrassia Vincent B.
Isen Forester W.
Motorola Inc.
LandOfFree
Volume control circuit using pulse modulation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Volume control circuit using pulse modulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Volume control circuit using pulse modulation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1075760