Digital enunciator, process and communication system employing s

Details Digital enunciator, process and communication system employing s Digital enunciator, process and communication system employing s

1998-09-25

2000-10-24

Lieu, Julie

Communications: electrical

Audible indication

Electronic siren

3403847, 34087012, 34087026, 84694, 84169, 384104, 384107, 4552001, 4552331, 455267, G08B 310

Patent

active

061373974

ABSTRACT:
A receiver in a communication system is coupled to a transmission channel for receiving communication signals transmitted over a transmission channel. The receiver includes signal receiving electronics for receiving communication signals directed to the receiver. The receiver also includes a controller, responsive to the receipt of a communication signal by the signal receiving electronics, to provide an enunciator enable signal, and a clock signal generator for generating a clock signal. The receiver further includes an enunciator coupled to the clock signal generator, for producing an electronic sound signal. The enunciator includes a volume control module for receiving a first periodic signal and providing a volume control signal. The enunciator also includes a divider for receiving the clock signal and providing a corresponding output signal having a frequency corresponding to the frequency of the clock signal frequency divided by a divider value. The enunciator further includes a tone control module coupled to the divider, for providing a tone control signal having a specified frequency and overtone pattern, and a modulator for modulating the third periodic signal by the second periodic signal to provide an electronic sound signal.

REFERENCES:
patent: 4000468 (1976-12-01), Brown et al.
patent: 4028500 (1977-06-01), McClure et al.
patent: 4363028 (1982-12-01), Bosnak
patent: 4389638 (1983-06-01), Gontowski
patent: 5732330 (1998-03-01), Anderson et al.
patent: 5757267 (1998-05-01), Xydis
patent: 5796852 (1998-08-01), Yamaguchi
International Search Report dated Jan. 25, 2000.

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