Did You Know...
...that the video game, Pong, was invented by a guy who graduated at the bottom of his engineering class? Nolan Bushnell spent more time running the games at a local amusement park than he did on his studies at the University of Utah. His dreams of working for Disney's amusement empire were dashed when the company wouldn't hire him. Taking a boring job, Nolan daydreamed about electronic versions of popular games. He invented Pong, the first video game, and went on to found Atari Co.
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| Number | Title | Issue Date |
| 7822211 | Stereo decoding system capable of reducing the phase shift during the signal transforming A stereo decoding system comprises an oscillator, a bandpass filter, a PLL unit and a stereo decoder. The oscillator generates a first signal with a center frequency. The bandpass filter receives a stereo multiplexed signal and the first signal to filter out a pilot... | 10/26/2010 |
| 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 |
| 7424431 | System, method and computer program product for adding voice activation and voice control to a media player A media player system, method and computer program product are provided. In use, an utterance is received. A command for a media player is then generated based on the utterance. Such command is utilized for providing wireless control of the media player. ... | 09/09/2008 |
| 7406302 | Digital FM stereo receiver architecture Systems and techniques for digital processing of FM stereo signals are described. A carrier signal such as a 38 kHz carrier may be recovered and used to process a difference signal such as a left minus right signal. The left minus right signal and a left plus right ... | 07/29/2008 |
| 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 |
| 7295631 | Stereo demultiplexer A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the modulated difference signal for a noise reduction. The proposed ster... | 11/13/2007 |
| 7272187 | Filter circuit and radio apparatus A distributor 103 distributes an input signal into two lines of distributed signals with equal amplitudes and equal phases. Buffers 104, 105 suppress interference between distributed signals distributed into the two lines. A filter 106 performs ... | 09/18/2007 |
| 7218696 | Synchronizing carrier frequencies of co-channel amplitude-modulated broadcast Systems and methods are described for carrier-frequency synchronization for improved AM and TV broadcast reception. A method includes synchronizing a carrier frequency of a broadcast signal with a remote reference frequency. An apparatus includes a reference signal ... | 05/15/2007 |
| 7212414 | Adaptive inductive power supply A contactless power supply has a dynamically configurable tank circuit powered by an inverter. The contactless power supply is inductively coupled to one or more loads. The inverter is connected to a DC power source. When loads are added or removed from the system, ... | 05/01/2007 |
| 7181018 | Digital stereo recovery circuitry and method for radio receivers Stereo recovery circuitry for a digital receiver is disclosed that provides increased accuracy and efficiency in recovering stereo signal information from transmitted stereo signals. The stereo decoder includes a digitally controlled oscillator that recovers a pilot... | 02/20/2007 |
| 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 |
| 7110511 | Twisted pair communication system A communication system for passing information between information services and terminal devices over a twisted wire pair network. The information services include a telephone exchange and other services, such as a data network and a television distribution system. ... | 09/19/2006 |
| 7106809 | AM/FM/IBOC receiver architecture An RF receiver operates to receive broadcast RF signals that include at least one of an analog portion and a digital portion. The RF receiver performs processing of the analog portion and/or the digital portion to generate a digital path signal. The RF receiver perf... | 09/12/2006 |
| 7092460 | Digital stereo demultiplexer In a stereo demultiplexer receiving a frequency demodulated stereo-multiplex signal (m(t)) which comprises at least a stereo-difference signal (md(t)), a stereo-sum signal (ms(t)) and a pilot carrier, a PLL-circuit (4) to recover the pil... | 08/15/2006 |
| 7079657 | System and method of performing digital multi-channel audio signal decoding A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Analog-to-digital conversion is performed on a composite analog audio signal at a fast clock rate to generate a composite digital audio signal at a firs... | 07/18/2006 |
| 7072424 | Adaptive direct conversion receiver A method and apparatus is disclosed for improving performance of a communication receiver. In one embodiment a method and apparatus is configured to process a communication signal by adjusting the amplification level of the signal and monitoring for a corresponding ... | 07/04/2006 |
| 7065331 | Resonator configuration A resonator system and method are provided which includes/uses a tunable reference resonator, parts for tuning the reference resonator to a reference value via a controlled variable for the reference resonator, a tunable circuit resonator, and parts for tuning the c... | 06/20/2006 |
| 6978026 | Circuit arrangement for gaining a stereo subcarrier and an RDS carrier According to the invention, a circuit arrangement for gaining a 38 kHz stereo subcarrier and a 57 kHz RDS carrier for decoding a stereo signal comprised in a demodulated FM signal and/or an RDS signal comprised in a demodulated FM signal, having a simple structure w... | 12/20/2005 |
| 6947765 | Method for transmitting data between data processing means and a radio communication network, module and mobile terminal for implementing same A data transmission module for transmitting data between a radio communication network that transmits data at a specified rate and data processing means includes network interface radio means for interfacing the data processing means with the radio communication net... | 09/20/2005 |
| 6934394 | Universal four-channel surround sound speaker system for multimedia computer audio sub-systems A universal four-channel multimedia computer speaker system is connectable to audio sub-system control circuits (e.g., “sound cards”) of both the four-channel type and the conventional two-channel (stereo) type. With the audio sub-system control circuit being of... | 08/23/2005 |
| 6928046 | Frame synchronization of an OFDM signal Frame synchronization of a received OFDM signal (such as that used in a hybrid FM DAB system) is provided by filtering out significant outer frequency portions of the digital channels, and then using cyclic extension and correlation of the cyclically extended bits (... | 08/09/2005 |
| 6901146 | All-digital FM stereo demodulator and demodulation method A stereo composite signal including a pilot signal is demodulated by processing input samples to obtain internal samples having variable sampling timings, synchronizing these sampling timings with the pilot signal, and digitally processing the internal samples to ob... | 05/31/2005 |
| 6847395 | Digital television signal test equipment The invention, in part, provides an integrated digital television (DTV) diagnostic instrument comprising: at least one of a video display device (VDD) and an audio display device (AudDD); DTV circuitry (AV) to receive a DTV signal, to reconstruct at least one of a v... | 01/25/2005 |
| 6823071 | Frequency modulation multiplex demodulation device A frequency modulation (FM) multiplex demodulation device is provided, in which the feeling of stereo is maintained excellent and the offensive noise to the ears can be reduced. The FM multiplex demodulation device includes: a filter for selecting a signal multiplex... | 11/23/2004 |
| 6813359 | Apparatus and method for minimizing multipath interference A method and apparatus for minimizing multipath interference for commercial FM signals which use SCA secondary signals in QAM format that includes tracking the time series of phase measurements of a received stereo pilot signal for determining the proper phase refer... | 11/02/2004 |
| 6782239 | Wireless output input device player A wireless output input device (WOID) digital audio player for storing and/or receiving digital audio and preserving the digital stream without the inherent distortion of translating the stream to analog prior to modulation and transmission, which includes an FM rec... | 08/24/2004 |
| 6714651 | FM stereo signal demoudulating apparatus and method An FM stereo signal demodulating apparatus includes a bandpass filter 1 for extracting a 19 Hz signal from an FM detected signal; a first phase shifter 21 for phase-shifting the 19 Hz signal by 90 degree; a first XOR 22 for taking an exclusive O... | 03/30/2004 |
| 6694026 | Digital stereo recovery circuitry and method for radio receivers Stereo recovery circuitry for a digital receiver is disclosed that provides increased accuracy and efficiency in recovering stereo signal information from transmitted stereo signals. The stereo decoder includes a digitally controlled oscillator that recov... | 02/17/2004 |
| 6671378 | Detection of noise in a frequency demodulated FM audio broadcast signal The noise in a frequency demodulated audio signal is detected on basis of the characteristics of the stereo-multiplex signal to obtain a very reliable information that can be used for the sliding stereo-mono transition, noise blanking and a de-noising of ... | 12/30/2003 |
| 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 |
| 6473605 | Noise reduction and range control radio system A radio back-end circuit that includes an integrator and a first variable voltage translator having a signal input coupled to the output of the integrator circuit. Also included is a first variable low pass filter, a second variable voltage translator, an... | 10/29/2002 |
| 6404408 | Enhanced radio graphic data system An enhanced radio graphic data system comprises an FM receiver, RDS demodulator and decoder, display, microprocessor and memory. The system incorporates a protocol enhancement of RDS involving the redefinition of several bits within the B-block. An accomp... | 06/11/2002 |
| 6295362 | Direct digital synthesis of FM signals A digital FM signal generator allows the generation of a modulated FM signal for broadcasting without the need for an analog modulator. The signal generator includes a digital signal processor which receives left and right signals from left and right sign... | 09/25/2001 |
| 6211748 | FM modulator The signal source of the reference frequency of a PLL 20 is composed of a VCO 24. A VCO 14 is provided. A first audio signal (L+R) is supplied to the VCO 24 so as to control its oscillation frequency f24. A second audio signal (L-R) is supplied... | 04/03/2001 |
| 6198825 | Wireless speaker circuit A 900 MHz wireless speaker system having a tuning system that is features a variable down conversion scheme provided by a phase lock loop system controlled by a microprocessor and an automatic frequency control circuit. The speaker system utilizes either ... | 03/06/2001 |
| 6178317 | System and method for mitigating intermittent interruptions in an audio radio broadcast system A system (100) is provided wherein a primary radio signal and a redundant radio signal are transmitted from a transmitter subsystem (120) and received by a receiver subsystem (140). The output (112) of an audio source (110) is coupled to a modulator (160)... | 01/23/2001 |
| 5801592 | Amplitude stabilized oscillator circuit An oscillator circuit is provided for stabilizing the amplitude of a HF oscillation of an audio signal. In such an oscillator circuit, an audio signal having a frequency in the range of 20 Hz . . . 20 kHz is coupled into the oscillator circuit, is modulat... | 09/01/1998 |
| 5684878 | Video signal recorder video apparatus and audio signal receiver The VCR (video cassette recorder) inserts an index signal into a video signal at the time of recording, when information which will later become inaccurate at the time of playback is included in the video signal. The index signal prevents the VCR from usi... | 11/04/1997 |
| 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 |
| 5579395 | Stereo decoder with cross-talk compensation A circuit arrangement for converting of a stereo signal having a mid-plane signal and a side signal into an output signal for each of two audio signal channels. By this circuit arrangement, a simplified and also automatic crosstalk cancellation is possibl... | 11/26/1996 |
