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| Number | Title | Issue Date |
| 7428308 | Transmitting and reproducing stereophonic audio signals Apparatus and method for transmitting and reproducing stereophonic audio signals are disclosed. The method comprises splitting first and second channels into two frequency bands, combining the lower frequency band signals of the two channels, and transmitting the co... | 09/23/2008 |
| 7372913 | Pilot tones in a multi-transmit OFDM system usable to capture transmitter diversity benefits In a wireless transmitter having a plurality of spatial streams differentiable at a receiver, wherein data is encoded and transmitted over a communication channel with pilot tones to provide the receiver with information about the effects of the communication channe... | 05/13/2008 |
| 7359671 | Multiple channel wireless communication system A wireless audio distribution system may have a wireless transmitter, responsive to a plurality of audio input channels, for transmitting signals carrying the audio, a receiver, responsive to the transmitted signals for selecting one or more of the audio input chann... | 04/15/2008 |
| 7343015 | Method and apparatus for high fidelity wireless stereophonic transmission utilizing dual frequency carriers A method and system is disclosed for transmitting two related channels of signals through the air. A first channel of signals is modulated with a first carrier frequency, and a second channel of signals is modulated with a second carrier frequency. The modulated fir... | 03/11/2008 |
| 7295809 | Portable audio playback device with bass enhancement Wirelessly linking a portable audio device to an external audio system permits the external audio system to generate audible signals that enhance local playback of audio by the portable device. For example, the portable device wirelessly transmits lower frequency co... | 11/13/2007 |
| 7233769 | Multiple channel wireless communication system A wireless audio distribution system may include a wireless transmitter transmititing an encoded digital bitstream serially combining each of a plurality of audio input channels and control data, a wireless receiver receiving the transmitted bitstream, a manual sele... | 06/19/2007 |
| 7149312 | Method and device to retrieve RDS information To retrieve RDS information by filtering and transforming an incoming multiplex signal (m(t)) into a RDS baseband signal, an amplitude modulated RDS signal (ma(t), mc(t)) is derived on basis of an intermediate signal (ma(t)) obtained... | 12/12/2006 |
| 7116709 | Communication method of contactless ID card and integrated circuit used in communication method The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each other, and “1” and “0” are allocated to the combined waveform. In ... | 10/03/2006 |
| 7107074 | Computer system with wireless audio signal transmitter module A computer system provides a wireless audio signal transmitter module which is capable of transmitting audio signal wirelessly from a host computer to at least one remote wireless signal receiver. The wireless audio signal transmitter module is connected to a sound ... | 09/12/2006 |
| 7095866 | Wireless 900 MHz broadcast link A high frequency signal transmission apparatus includes a transmitter for transmitting received signals from a signal source as a modulated signal on a high frequency 900 MHz carrier to a remote receiver. The remote receiver converts the high frequency carrier in at... | 08/22/2006 |
| 7082203 | Wireless audio transmission method and apparatus for coupling audio players to audio receivers A wireless audio transmission apparatus and method for coupling audio players to audio receivers for broadcast of audio signals stored in and processed by the audio player. A housing carrying operative circuitry is electrically connected by a multiconductor cable to... | 07/25/2006 |
| 7076204 | Multiple channel wireless communication system A wireless transmission device for communicating a plurality of audio streams to remote devices may include a plurality of inputs for receiving a plurality of digital audio streams, a combiner connected to the inputs for combining control codes and the received audi... | 07/11/2006 |
| 7050603 | Watermark encoded video, and related methods Watermarks in video signals or the accompanying audio track are used to associate video objects in a video sequence with object specific actions or information. A video object refers to a spatial and temporal portion of a video signal that depicts a recognizable obj... | 05/23/2006 |
| 7032160 | Communication system and method using signal to noise ratio estimation for scaling in processing received wireless communication signals A system, components and methods provide FEC decoding in a wireless communication system in which signal to noise ratio estimation is used for scaling information captured by a demodulator in processing received wireless communication signals. A preferred wireless t... | 04/18/2006 |
| 6987947 | Multiple channel wireless communication system A wireless audio distribution system having a wireless transmitter, responsive to a plurality of audio input channels, for transmitting a encoded digital bitstream serially combining each of the audio input channel, the encoded digital bitstream further including co... | 01/17/2006 |
| 6968062 | Transmitter of infrared transmission system and reproducing apparatus comprising headphone device This invention is directed to a transmitting apparatus adapted for carrying out transmission of audio signals by using infrared rays and a reproducing apparatus using a headphone device adapted to receive audio signals transmitted from the transmitting apparatus to ... | 11/22/2005 |
| 6963792 | Surgical method A teleoperator system with telepresence is shown which includes right and left hand controllers (72R and 72L) for control of right and left manipulators (24R and 24L) through use of a servomechanism that includes computer. The teleoperato... | 11/08/2005 |
| 6954534 | Multiple signal carrier transmission apparatus and method A multiple signal carrier transmission apparatus and method for broadcasting stereo sounds to an audio output device uses three related carrier frequencies on which are modulated the sum of first and second stereo channel signals and the first and second stereo chan... | 10/11/2005 |
| 6658115 | Method and apparatus for high fidelity wireless stereophonic transmission A method and apparatus for high fidelity duplexing, local transmission and reception of audio-signals transmitted from sources such as stereos, televisions, or musical instruments is taught. According to these teachings, high fidelity wireless stereophoni... | 12/02/2003 |
| 6618486 | Controller for FM 412 multiplex power regulation A feedback controller, embedded in an FM audio processor, that controls the "integrated multiplex power" to the requirements of ITU-R 412 (2.51) is disclosed. This regulation specifies the maximum power, which is the same as the power produced by a sinewa... | 09/09/2003 |
| 6337913 | Wireless transmitter/receiver circuit system with floating frequency tracing function for a wireless audio equipment A wireless transmitter/receiver circuit system having a transmitter circuit and a receiver circuit, that enable a wireless headphone or speaker system to automatically trace floating frequency upon receiving of a transmitting signal, so as to achieve a qu... | 01/08/2002 |
| 5970390 | Transmitter and automobile audio apparatus using the same A transmitter for transmitting an audio signal derived from an audio appliance to an FM (frequency modulation) radio includes a transmitter circuit for converting the audio signal derived from an audio appliance into an FM signal within an FM broadcasting... | 10/19/1999 |
| 5920631 | Multiplex transmission device for multiple-channel signals, especially multiple-channel audio signals A multiplex transmission device for multiple-channel signals, in particular multiple-channel audio signals, has a plurality of input channels, each of which receives an input signal, a multiplexer, the input channels being connected with the inputs of the... | 07/06/1999 |
| 5862235 | Multiple broadcast channel transmitter arrangment A transmitter includes a plurality of oscillators for transmitting multiple radio frequency (RF) signals simultaneously, from each one of which signals a broadcast radio receiver system can reproduce the transmitted audio information. The transmitter will... | 01/19/1999 |
| 5771441 | Small, battery operated RF transmitter for portable audio devices for use with headphones with RF receiver A portable RF transmitter having an audio plug extending therefrom which mates with the earphone or output jack of an audio source such as a portable battery operated CD or tape player and having no external antenna. The portable RF transmitter modulates ... | 06/23/1998 |
| 5737427 | Surround sound processor unit A surround sound processor unit includes a plurality of preamplifiers, an in-phase audio decoder circuit, an out-of-phase audio decoder circuit, at least one transmitter, at least one receiver, at least one speaker amplifier, and a plurality of power ampl... | 04/07/1998 |
| 5682431 | FM stereo broadcasting apparatus and method The FM stereo broadcasting apparatus has a sampling frequency converter for receiving a digital input signal having an L (left audio)-signal and an R (right audio)-signal and for converting the digital input signal so that its sampling frequency is equal ... | 10/28/1997 |
| 5673323 | Analog spread spectrum wireless speaker system An analog spread spectrum wireless speaker system for use in consumer audio applications for providing reliable and high fidelity stereo sound. The system includes a transmitter that accommodates any analog input from a variety of audio devices such as co... | 09/30/1997 |
| 5619577 | Transmission system, and a transmitter and a receiver for use in such a system A simple and effective stereophonic transmission system (1) wherein the transmitter (2) alternatively encodes successive block periods of a block signal with samples of the left-hand channel signal (Lin) and the right-hand channel signal (R | 04/08/1997 |
| 5581617 | System for short-range transmission of signals over the air using a high frequency carrier A system is provided which transmits either analog or digital data signals over the air. The system includes a transmitter and a receiver. The transmitter and receiver are arranged to transmit signals using a carrier signal having a high frequency such as... | 12/03/1996 |
| 5561715 | Synchronization of prerecorded audio/video signals with multi-media controllers A fuel dispenser having a controllable audio/video program display includes a fuel pump and delivery path, a program media display, and a prerecorded program and a multi-media controller to direct program signals to the program media display. Apparatus is... | 10/01/1996 |
| 5448757 | Audio signal modulating system with pre-emphasis An FM audio system has an FM tuner, a CD player, a stereo modulator for modulating an audio signal from the CD player to produce a composite signal so as to be received by the FM tuner for reproducing the audio signal. A control circuit such as an automat... | 09/05/1995 |
| 5349386 | Wireless signal transmission systems, methods and apparatus A transmission apparatus and method for transmitting stereo multiplexed audio signals from a received television signal having a horizontal frequency fH are provided. Right and left channel audio signals obtained by demodulation from the receiv... | 09/20/1994 |
| 5319716 | Wireless CD/automobile radio adapter This invention discloses a wireless compact disc stereo playback system for use in automobiles. An FM transmitter is employed which is connected at the output of a portable CD player, the FM transmitter thereby producing a stereo FM signal which is transm... | 06/07/1994 |
| 5299264 | System for short-range transmission of signals over the air using a high frequency carrier A system is provided which transmits either analog or digital data signals over the air. The system includes including a transmitter and a receiver. The transmitter and receiver are arranged to transmit signals using a carrier signal having a high frequen... | 03/29/1994 |
| 5155769 | Discrete parallel path modulation multiplexer A discrete parallel path modulation multiplexer for use in generating a composite baseband signal from separate left and right input signals. The composite baseband signal includes the sum of the left and right input signals and the product of the differe... | 10/13/1992 |
| 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 musical selections, and includes data which identifies the m... | 06/02/1992 |
| 5054070 | Stereo signal communication system and method A system which enables transmission of a standard composite stereo sound signal, made up of baseband, subcarrier band and pilot signals, from a first location to a second location while requiring only a relatively low bit rate for the transmission link. T... | 10/01/1991 |
| 5001757 | FM stereo tone detector A stereo FM radio transmission system with FMX transmission and reception capability includes a transmitter that transmits a pilot-coherent FMX-tone indicator signal at a frequency of an exact integer submultiple of the pilot frequency. The system also in... | 03/19/1991 |
| 4991212 | Broadcast signal conditioning method and apparatus A signal conditioning circuit for use in broadcasting a composite stereo signal in the 50 hertz to 53 kilohertz range. The signal conditioning circuit includes a filter for attenuating signals above the 53 kilohertz range, a delay circuit to reduce freque... | 02/05/1991 |
