FSK Voiceband modem using digital filters

Details FSK Voiceband modem using digital filters FSK Voiceband modem using digital filters

1981-09-24

1984-01-10

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

332 9R, 329107, 375 45, H04L 2710, H04L 2718

Patent

active

044256655

ABSTRACT:
An asynchronous FSK modulator-demodulator (modem) having a capability of operating at data rates of 300, 600 and 1200 bits per second in a voiceband telephone channel is compatible with the specifications of the Bell 103/113, Bell 202, CCITT V.21 and CCITT V.23 modem types. The modem according to the invention is incorporated into a single integrated circuit to minimize external components in a system. The modem is pin programmable, that is, the mode and speed of operation is defined by a parallel digital data signal applied to device terminals. Digital signal processing techniques are employed to perform all major functions, including modulation and filtering. Multiplication functions are performed without need for multipliers by employing shift registers and canonic sign arithmetic. Analog-to-digital conversion and digital-to-analog conversion circuits are incorporated into the device.

REFERENCES:
patent: 3937882 (1976-02-01), Bingham
patent: 4336613 (1982-06-01), Hewes

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