Modulator for use in an interface between a digital signal proce

Details Modulator for use in an interface between a digital signal proce Modulator for use in an interface between a digital signal proce

1980-01-24

1982-09-21

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

375 24, G11B 509

Patent

active

043510086

ABSTRACT:
An improved modulator is capable of facilitating recording and reproducing on and from an audio cassette tape digital signals such as programs and numerical data coming from digital signal processing apparatus including an electronic cash register as well as providing safety for the audio cassette tape when in operation. The modulator includes a control circuit for detecting and counting carrier signals and outputting desired information in response to a data transfer instruction and a state detector governed by the control circuit wherein the carrier signals are sent out via data transfer lines when the detector is in a specific state. The control circuit may be implemented with a microprocessor.

REFERENCES:
patent: 3303486 (1967-02-01), Young
patent: 3417388 (1968-12-01), Timm
patent: 3459892 (1969-08-01), Shagena et al.
patent: 3732364 (1973-05-01), Terada
patent: 3904965 (1975-09-01), Leuthold
patent: 3919641 (1975-11-01), Kurokawa et al.

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