H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1, 325/53
H04B 1/04 (2006.01) H03J 9/06 (2006.01) H04B 10/155 (2006.01) H04M 11/06 (2006.01) H04M 11/08 (2006.01)
Patent
CA 1197559
- 21 - ABSTRACT FREQUENCY MODULATION TRANSMITTER CIRCUIT ARRANGEMENTS FOR VOICE OR DATA 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.
400469
Lese Gregory
Nash Donald H.
Kirby Eades Gale Baker
Western Electric Company Incorporated
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