H - Electricity – 03 – G
Patent
H - Electricity
03
G
330/39
H03G 3/30 (2006.01) H03G 1/00 (2006.01) H03G 3/00 (2006.01)
Patent
CA 2031580
- 10 - A General Purpose Low Cost Digital Amplitude Regulator Abstract Apparatus for digital amplitude regulation is disclosed, for use as a volume control or the like, utilizing pulse width modulation to control gain through the variation of the incremental resistance of a two terminal non-linear element, the resistance of which varies with current, e.g., a diode or diode like element. A stream of pulses, the duty cycle of which is variable and digitally controlled, is filtered to produce a quasi-continuously variable direct-current (DC) voltage. The DC voltage either directly or by providing a DC current regulates the gain of an amplifier that is amplifying the signal of interest by regulating the transmission characteristics of the diode. For low cost implementation in a system already employing a microprocessor or microcomputer the determinative duty cycle can be derived under software control and supplied as an output from a single latchable output pin. In an exemplary implementation, the incremental resistance of an ordinary silicon diode operated in accordance with the small signal model of a diode. Additionally, the use of an energy storing type filter allows the the continuous stream of variable duty cycle pulses to be momentarily interrupted so that a pin used for supplying the pulses can be used for the performance of additional functions without affecting the perceived volume level. (FIG. 1).
Kutzavitch Walter G.
Rosenthal Eugene J.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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