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Class Information
Number: 455/45
Name: Telecommunications > Transmitter and receiver at separate stations > Frequency or phase modulation > Via subcarrier
Description: Subject matter where an intermediate frequency wave is modulated by a modulating signal representative of an intelligence or message and in turn is applied as a modulation signal to a main carrier wave, either alone or in conjunction with other subcarriers.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4660193 |
Digital modulation method for standard broadcast FM subcarrier |
Apr. 21, 1987 |
| 4646290 |
Data transmission method and apparatus |
Feb. 24, 1987 |
| 4633517 |
Circuit for decoding traffic information message tone signals |
Dec. 30, 1986 |
| 4584708 |
Communication system, and transmitter therefor, including special announcement recognition |
Apr. 22, 1986 |
| 4561115 |
Decoder for traffic information regional tone signals |
Dec. 24, 1985 |
| 4541118 |
SSB System with pilot coded squelch |
Sep. 10, 1985 |
| 4517562 |
FM Communication system |
May. 14, 1985 |
| 4499603 |
Radio receiver with reception-readiness monitoring feature and method |
Feb. 12, 1985 |
| 4481671 |
Remote control system, particularly for remote radio transmitter control |
Nov. 6, 1984 |
| 4476573 |
Radio link remote control signaling system, and method |
Oct. 9, 1984 |
| 4476581 |
FM Receiver with subcarrier decoding circuit |
Oct. 9, 1984 |
| 4476577 |
Radio transmitter system with special program identification |
Oct. 9, 1984 |
| 4450589 |
FM Receiver for reception of special announcements and general programs |
May. 22, 1984 |
| 4449249 |
Televison programming information system |
May. 15, 1984 |
| 4435843 |
FM Receiver for general programs and special announcements |
Mar. 6, 1984 |
| 4379947 |
System for transmitting data simultaneously with audio |
Apr. 12, 1983 |
| 4345334 |
Reduced-cross talk telemetry system and method of manufacture thereof |
Aug. 17, 1982 |
| 4210870 |
Signal transmitting system |
Jul. 1, 1980 |
| 4090138 |
FSK Transmitter having frequency band-limitation |
May. 16, 1978 |
| 4078245 |
System for multiplexing information channels adjacent to a video spectrum |
Mar. 7, 1978 |
| 4048619 |
Secure two channel SCA broadcasting system |
Sep. 13, 1977 |
| 3980954 |
Bidirectional communication system for electrical power networks |
Sep. 14, 1976 |
| 3939407 |
Plural channel communications system |
Feb. 17, 1976 |
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