Modem for use in a data communication system

Details Modem for use in a data communication system Modem for use in a data communication system

1990-12-20

1992-08-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

358445, H04B 138

Patent

active

051406128

ABSTRACT:
In a data communication system, a modem for recording and reproducing audio tone data in addition to picture data includes an A/D converter, a D/A converter, and a digital modem section for demodulating the digital data outputted from the A/D converter and for modulating the digital demodulated data to be transmitted to the D/A converter. The system further includes a coding-decoding section for coding the digital data outputted from the A/D converter and for decoding the digital coded data to be transmitted to the D/A converter. The A/D and D/A converters are used in common for both the digital modem section and the coding-decoding section.

REFERENCES:
patent: 4635132 (1987-06-01), Nakamura
patent: 4677645 (1987-06-01), Kaniwa et al.
patent: 4931250 (1990-06-01), Greszczuk

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