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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 |
| 5581576 |
Radio information broadcasting and receiving system |
Dec. 3, 1996 |
| 5579537 |
Broadcast system with associated data capabilities |
Nov. 26, 1996 |
| 5577266 |
Broadcast system with associated data capabilities |
Nov. 19, 1996 |
| 5572201 |
Alerting device and system for abnormal situations |
Nov. 5, 1996 |
| 5568655 |
Detection of pager signal in FM radio transmission |
Oct. 22, 1996 |
| 5561849 |
Apparatus and method for music and lyrics broadcasting |
Oct. 1, 1996 |
| 5539635 |
Radio station program identifier and distribution system |
Jul. 23, 1996 |
| 5524051 |
Method and system for audio information dissemination using various modes of transmission |
Jun. 4, 1996 |
| 5515372 |
Method and apparatus for radio data control |
May. 7, 1996 |
| 5507024 |
FM data-system radio receiver |
Apr. 9, 1996 |
| 5491838 |
Broadcast system with associated data capabilities |
Feb. 13, 1996 |
| 5442646 |
Subcarrier communication system |
Aug. 15, 1995 |
| 5440586 |
Receiver having reduced influence of oscillator radiation and parasitic crosstalk effects on gain control |
Aug. 8, 1995 |
| 5428600 |
Method and devices for transmitting data, particularly by satellite |
Jun. 27, 1995 |
| 5428610 |
FM radio system employing time shared wide SCA for digital data band |
Jun. 27, 1995 |
| 5408686 |
Apparatus and methods for music and lyrics broadcasting |
Apr. 18, 1995 |
| 5406626 |
Radio receiver for information dissemenation using subcarrier |
Apr. 11, 1995 |
| 5404588 |
RDS receiver with improved alternate frequency switchover |
Apr. 4, 1995 |
| 5404566 |
Process for generating an entertainment audio signal interrupted by advertising audio signals and device for carrying out the process |
Apr. 4, 1995 |
| 5276909 |
Traffic information broadcast system |
Jan. 4, 1994 |
| 5257403 |
Method of subcarrier multiplication which preserves AM Information in FM systems |
Oct. 26, 1993 |
| 5241687 |
Phase controlling phase of local subcarrier signal to correspond to transmitted pilot signal |
Aug. 31, 1993 |
| 5239540 |
Method and apparatus for transmitting, receiving and communicating digital data signals with corresponding program data signals which describe the digital data signals |
Aug. 24, 1993 |
| 5222254 |
Receiver including means for acquisition and comparison of identification data of two transmission channels |
Jun. 22, 1993 |
| 5214787 |
Multiple audio channel broadcast system |
May. 25, 1993 |
| 5214792 |
Broadcasting system with supplemental data transmission and storge |
May. 25, 1993 |
| 5201060 |
Baseband signal communication apparatus |
Apr. 6, 1993 |
| 5193213 |
FM broadcast band subcarrier receiver |
Mar. 9, 1993 |
| 5177604 |
Interactive television and data transmission system |
Jan. 5, 1993 |
| 5170487 |
Paging system with multiple frequencies and multiple protocols |
Dec. 8, 1992 |
| 5146610 |
Discontinuous transmission muting/unmuting system with link continuity |
Sep. 8, 1992 |
| 5146612 |
Technique for using a subcarrier frequency of a radio station to transmit, receive and display a message together with audio reproduction of the radio program |
Sep. 8, 1992 |
| 5142692 |
Transmitting information with cut and flip spectrum |
Aug. 25, 1992 |
| 5133083 |
Adjacent channel selectivity signal generator system |
Jul. 21, 1992 |
| 5119503 |
Apparatus and methods for broadcasting auxiliary data in an FM stereo broadcast system |
Jun. 2, 1992 |
| 5093930 |
Directly mixing synchronous AM receiver |
Mar. 3, 1992 |
| 5077827 |
Warning receiver readiness monitoring circuit |
Dec. 31, 1991 |
| 5070404 |
Method and apparatus for contemporaneous delivery of data |
Dec. 3, 1991 |
| 5063610 |
Broadcasting system with supplemental data transmission and storage |
Nov. 5, 1991 |
| 5023934 |
Apparatus and method for communication of visual graphic data with radio subcarrier frequencies |
Jun. 11, 1991 |
| 5023933 |
Superheterodyne SCA receiver and method for the manufacture thereof |
Jun. 11, 1991 |
| 4991201 |
SCA facsimile adapter |
Feb. 5, 1991 |
| 4910793 |
Two-way transmission system for ground/mobile station communications |
Mar. 20, 1990 |
| 4905303 |
Television audio signal converter |
Feb. 27, 1990 |
| 4899350 |
Signal communication capable of avoiding an audible reproduction of a sequence of information signals |
Feb. 6, 1990 |
| 4885802 |
Wristwatch receiver architecture |
Dec. 5, 1989 |
| 4862513 |
Radio receiver with two different traffic information decoders |
Aug. 29, 1989 |
| 4829588 |
Automatic retransmission with pilot tone |
May. 9, 1989 |
| 4768033 |
Callsign display for transceiver |
Aug. 30, 1988 |
| 4703476 |
Encoding of transmitted program material |
Oct. 27, 1987 |
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