Frequency modulation transmitter for voice or data

Details Frequency modulation transmitter for voice or data Frequency modulation transmitter for voice or data

1982-12-06

1984-07-17

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

332 16R, 332 20, 332 29R, H03C 300

Patent

active

044610130

ABSTRACT:
A portable frequency modulation transmitter (1) for voice or data is disclosed for operation at infrared frequencies. The transmitter comprises keyboard (200) or microphone (402) input capability and dual modes of use. In the data mode, carrier is generated when the keyboard is operated and is not generated when the keyboard is idle in order to conserve power. In the voice mode, either voice or data may be transmitted, data having priority over voice. A series connection of two variable modulus counters (302, 303) and other counters (304, 305, 306) provide a frequency shift keyed data signal, marker data signal, marker data frames between data frames, parity insertion and other features. In the event that the local battery power level falls below a particular level, a particular word is inserted in the applied binary data input.

REFERENCES:
patent: 3761625 (1973-09-01), Bruene
patent: 4232308 (1980-11-01), Lee et al.

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