Powered conservation system in battery powered keyboard device i

Details Powered conservation system in battery powered keyboard device i Powered conservation system in battery powered keyboard device i

1983-08-10

1987-03-10

Rowland, James L.

Communications: electrical

Audible indication

Percussion-type sound producer

340711, 364707, G09G 300, G06F 100

Patent

active

046493735

ABSTRACT:
In a self-contained battery powered keyboard entry device, the keyboard is driven from a microprocessor and its output sensed by the microprocessor to generate drive signals for an infra-red transmitter. The sense lines are monitored so that, on a key depression, the microprocessor is switched to an operating mode from its low-power standby mode. When all sensed signals have been processed and outputted, the microprocessor is returned to the low-power standby mode.

REFERENCES:
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patent: 4409665 (1983-10-01), Tubbs
patent: 4455623 (1984-06-01), Wesemeyer et al.
Torelli et al, "PCM Remote Control Chips Detect Transmission Errors" Electronic Engineering, vol. 55, No. 676, Apr., 1983, P41-43, 47.
Patents Abstracts of Japan, vol. 6, No. 171, Sep. 4, 1982 P 140 (1049).
G. d'Andrea et al, "Frequency Synthesis for Color TV-Receivers" IEEE Transactions on Consumer Electronics, vol. CE-27, No. 3, Aug., 1981 P272-282.
Patent Abstracts of Japan No. 245, Oct. 29, 1983 (P-233) (1390).
T. G. Arthur et al, "Cordless Keyboard" IBM Technical Disclosure Bulletin, vol. 26, No. 2, Jul., 1983, P 620.

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