Matches 101 - 150 out of 191 < 1 2 3 4 >
Match Document Document Title
5568655 Detection of pager signal in FM radio transmission  
Apparatus for detecting the presence of a paging signal at 57 KHz in a frequency modulated transmission includes a phase locked loop (14) which is sensitive to the presence of a pager signal. The...
5561849 Apparatus and method for music and lyrics broadcasting  
A system for broadcasting audio music and broadcasting lyrics for display and highlighting substantially simultaneously with the occurrence of the lyrics in the accompanying audio music is...
5539635 Radio station program identifier and distribution system  
A radio program distribution system for creating custom recordings containing a requested plurality of musical programs. The system stores digital copies of musical programs and can selectively...
5524051 Method and system for audio information dissemination using various modes of transmission  
A system and method of information dissemination that permits the user to listen to the specific content of information when and where he or she wants to. A radio or television receiver system...
5515372 Method and apparatus for radio data control  
RDS data broadcast method and apparatus is disclosed that provides dynamic sequencing and parallel formating to improve access to and the reliability of Radio Data System (RDs) services. Dynamic...
5507024 FM data-system radio receiver  
An FM stereo radio data-system receiver has a front end including an FM discriminator that produces a composite signal composed of an AM stereo signal, including a 19 KHz pilot, and an AM...
5442646 Subcarrier communication system  
A communication system (100) is provided for transmitting data to mobile receivers utilizing a subcarrier within a commercial FM channel of a radio station (55). The data transmitted is first...
5440586 Receiver having reduced influence of oscillator radiation and parasitic crosstalk effects on gain control  
Receiver having an RF input for applying an RF input carrier thereto, which receiver is coupled to a phase-locked loop (PLL) whose signal path incorporates a phase detector, a loop filter, a...
5428610 FM radio system employing time shared wide SCA for digital data band  
A wide band, wide area FM-SCA radio system has a central station that transmits multiple audio signals and digital data signals through a satellite network to FM stations participating in the...
5428600 Method and devices for transmitting data, particularly by satellite  
A relay satellite receives, from stations on the ground, modulated high-frequency signals situated in two different frequency bands. One of the modulations is narrow band and the other broad band....
5406626 Radio receiver for information dissemenation using subcarrier  
A radio receiver receives FM subcarrier transmissions, and stores the transmitted textual information in a random access memory. The information is typically news, weather, sports, entertainment or...
5404566 Process for generating an entertainment audio signal interrupted by advertising audio signals and device for carrying out the process  
A process for generating an entertainment audio signal interrupted by advertising audio signals in which pilot signals associated with the advertising audio signals cause switching between the...
5404588 RDS receiver with improved alternate frequency switchover  
In a radio receiver having a device for decoding radio data signals, which are divided into groups each with a predetermined number of bits and contain a program identification code, and having a...
5276909 Traffic information broadcast system  
A broadcast and reception system provides a segmented broadcast signal for providing regional traffic information and a receiver adapted to receive selected segments of that broadcast. The...
5257403 Method of subcarrier multiplication which preserves AM Information in FM systems  
A multiplication circuit for use in an FM television transmitter and receiver is provided. The multiplication circuit includes a limiting circuit for limiting a subcarrier supplied thereto and a...
5241687 Phase controlling phase of local subcarrier signal to correspond to transmitted pilot signal  
Apparatus for demodulating information signals frequency-modulated on an RF carrier signal carrying spectral components within the audio frequency range, a pilot carrier signal having an imparted...
5239540 Method and apparatus for transmitting, receiving and communicating digital data signals with corresponding program data signals which describe the digital data signals  
An apparatus and method is described for transmitting, receiving and communicating program data signals which are combined with digital data signals. Preferably, the present invention compresses 30...
5222254 Receiver including means for acquisition and comparison of identification data of two transmission channels  
A receiver, adapted to the reception of identification data in accordance with the RADIO DATA system (RDS) and having only one tuner, effects the acquisition of the identification code of an...
5214792 Broadcasting system with supplemental data transmission and storge  
A broadcast receiver or monitor unit receives and decodes items of information pertaining to broadcast program material, such as the title of a broadcast musical piece, the artist name, tape/CD...
5214787 Multiple audio channel broadcast system  
A microwave system is provided for the broadcast of multiple channels of audio programming to a wide listener base, in which noise-free transmission of multiple audio channels is accomplished...
5201060 Baseband signal communication apparatus  
A baseband signal communication apparatus includes a transmission unit and a reception unit. The transmission unit superposes a subcarrier on one value of a baseband signal consisting of binary...
5193213 FM broadcast band subcarrier receiver  
An FM subcarrier receiver of the type useful for detection of a relatively high frequency subcarrier signal transmitted on an FM carrier which includes baseband and relatively high frequency...
5170487 Paging system with multiple frequencies and multiple protocols  
The present invention provides a pager system which integrates a plurality of transmitters which operate at different frequencies. Some of the transmitters transmit paging messages using FM...
5146610 Discontinuous transmission muting/unmuting system with link continuity  
A system for facilitating link continuity and prompt supervisory control in a communication system with discontinuous transmissions comprising varying the carrier power in a first communication...
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  
A message is transmitted on a subcarrier of a main carrier frequency of a radio station. The message is displayed simultaneously with the audible reproduction of the radio program. The message is...
5142692 Transmitting information with cut and flip spectrum  
The present invention provides a technique and system for modifying the modulation of the 66.5 kHz subcarrier in such a way that its spectrum will not overlap that required by the 57 kHz...
5133083 Adjacent channel selectivity signal generator system  
In an adjacent channel measurement system, a desired channel signal and an adjacent channel signal are generated using a single signal generator. The output from this generator is modulated with a...
5119503 Apparatus and methods for broadcasting auxiliary data in an FM stereo broadcast system  
Apparatus and methods are disclosed for broadcasting auxiliary data in an FM stereo broadcasting system. The auxiliary data is broadcast in addition to regular audio broadcast programs including...
5093930 Directly mixing synchronous AM receiver  
A directly mixing synchronous AM receiver includes a synchronous demodulator coupled to an antenna input for synchronously demodulating an RF-AM reception carrier and a phase-locked loop (PLL)...
5077827 Warning receiver readiness monitoring circuit  
A warning radio receiver is adapted to receive not only a recognition signal for emergency broadcast but also two further recognition signals, namely a warning network transmitter recognition...
5070404 Method and apparatus for contemporaneous delivery of data  
A method and system for the contemporaneous delivery of data from a first location to a user at a remote location utilizes standard broadcast facilities as the transmission medium. The data and an...
5023933 Superheterodyne SCA receiver and method for the manufacture thereof  
An SCA receiver is provided which has a close to ideal passband characteristic which greatly improves frequency response to produce a brighter sound due to the use of ceramic resonator elements....
5023934 Apparatus and method for communication of visual graphic data with radio subcarrier frequencies  
A data communication system in which video data is digitized, compacted, and transmitted by a frequency modulated radio station having a subsidiary communication authorization. The data is...
4991201 SCA facsimile adapter  
A facsimile signal control system adapted to be connected between a facsimile machine and a telephone line, comprises an RF signal receiver adapted to receive and demodulate RF signals from an...
4910793 Two-way transmission system for ground/mobile station communications  
Information is transmitted at microwave frequencies, the ground station being connected to a waveguide (25) and the station aboard a railway vehicle being connected to an antenna (26). Each station...
4905303 Television audio signal converter  
A converter to convert audio signal associated with commercial television transmissions for input into conventional AM/FM automobile receivers so as to facilitate listening to the audio portions of...
4899350 Signal communication capable of avoiding an audible reproduction of a sequence of information signals  
In a communication system for use in transmitting a sequence of information signals in addition to a sequence of digital voice signals subjected to adaptive delta modulation, the information signal...
4885802 Wristwatch receiver architecture  
A wristwatch FM subcarrier paging receiver architecture is disclosed that overcomes the many inherent problems (such as self-oscillation, image responses, spurious local oscillator radiation and...
4862513 Radio receiver with two different traffic information decoders  
An autombile radio capable of receiving VHF entertainment programs from a station in which traffic information signals are modulated in a 57 kHz subcarrier is equipped with two decoders for the 57...
4829588 Automatic retransmission with pilot tone  
A transceiver and method of controlling the automatic retransmission of a radio frequency commmunications signal in which a pilot tone within the radio frequency communications channel bandwidth...
4768033 Callsign display for transceiver  
A callsign display device for a transceiver which receives a radio wave carrying a coded digital signal of a data including a callsign for amature wireless radio communication. The callsign display...
4703476 Encoding of transmitted program material  
An audio program is encoded with a subaudible binary code. A first value bit (mark) is a first frequency signal and a second value bit (space) is a second frequency signal. The coded message...
4660193 Digital modulation method for standard broadcast FM subcarrier  
A digital transmission system using standard FM broadcast stations employs an SCA subcarrier which is amplitude modulated with a second subcarrier modulated to have different phase orientations...
4646290 Data transmission method and apparatus  
A data transmission method and apparatus, particularly useful in an SCA FM subcarrier data transmission system, is disclosed. The method comprises selectively arranging individual characters of...
4633517 Circuit for decoding traffic information message tone signals  
An essentially digital circuit is disclosed in which a demodulated broadcast signal is digitized by an analog-to-digital converter and processed in three signal paths each including a tuned filter....
4584708 Communication system, and transmitter therefor, including special announcement recognition  
FM transmission system in which, besides program content, an auxiliary carrier of, for example 57 kHz, is radiated, which auxiliary carrier is modulated by an announcement recognition (AR) signal...
4561115 Decoder for traffic information regional tone signals  
A circuit for decoding broadcast traffic area signals according to the European standards utilizes digital circuitry to check for four criteria.
4541118 SSB System with pilot coded squelch  
A single sideband communications system conveying a message through a transmitter to one or more predetermined receivers which are enabled by a coded squelch signal unique to the predetermined...
4517562 FM Communication system  
Communication system for either public or private electric power load management and distribution automation, and the like, wherein subcarrier signals are sent to a plurality of remotely located...
4499603 Radio receiver with reception-readiness monitoring feature and method  
To monitor the operability of a radio receiver which has special recognition circuitry to recognize warning or emergency announcements, a modulation detector (11) is provided, sensing the change in...
Matches 101 - 150 out of 191 < 1 2 3 4 >