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| Number | Title | Issue Date |
| 8144878 | FM receiver and pilot detector thereof, and method for determining a type of a processed signal An FM receiver and a pilot detector thereof, and a method for determining a type of a processed signal are provided. The FM receiver comprises a demodulator, a band pass filter (BPF), and a pilot detector. The demodulator generates a multiplexed (MPX) signal. The BP... | 03/27/2012 |
| 7366488 | Digital carrier-recovery scheme for FM stereo detection Systems and techniques for digital processing of FM signals. Digital processing may include recovering a carrier signal at a second frequency based on a reference signal at a first frequency. ... | 04/29/2008 |
| 7364009 | Loudspeaker mounting frame, loudspeaker and cabinet comprising a loudspeaker A loudspeaker mounting frame (1) for an electronic appliance has a central opening for receiving a loudspeaker membrane (24), and a plurality of through holes (11) surrounding said central opening for receiving fixing means (25). The thro... | 04/29/2008 |
| 7327848 | Visualization of spatialized audio A method and apparatus is provided for presenting a user with a visual indication of the likely user-perceived location of sound sources in an audio field generated from left and right audio channel signals. To produce this visual indication, corresponding component... | 02/05/2008 |
| 7228190 | Method and apparatus for controlling a lighting system in response to an audio input Methods and apparatus for executing a lighting program to control a plurality of light emitting diodes (LEDs) in response to at least one characteristic of an audio input. In one embodiment, the audio input is digitally processed to determine the at least one charac... | 06/05/2007 |
| 7187775 | Audio signal recording apparatus When a plug of a monaural microphone is connected to an external microphone input section, a right channel terminal is connected to a GND terminal, and a voltage Vdet will be a GND potential. A DC voltage detection section detects this GND potential, and outputs, fo... | 03/06/2007 |
| 7120256 | Audio testing system and method A method is provided for increasing the quality of audio reproduction of a binaural rendering in a passenger environment having a number of seats, each seat having an audio system including a headphone jack for interconnection with a headphone device. The method com... | 10/10/2006 |
| 7050590 | Method and apparatus for checking audio signals A test signal generator adapted to generate a test signal for an audio program having at least a left and right program track, the test signal generator including a memory means holding digital data descriptive of a unique image; and converter adapted to convert the... | 05/23/2006 |
| 7016501 | Directional decoding The degree of correlation between two audio signals is determined and the channels are normalized according to first and second normalization modes responsive to correlation and uncorrelation respectively. ... | 03/21/2006 |
| 7017178 | Audio program reception terminal for television delivery system The invention relates to apparatus and methods for upgrading a set top terminal for use with a cable television program delivery system. A hardware upgrade or expansion card is connected to a set top terminal to enhance the functionality of the set top terminal and ... | 03/21/2006 |
| 7013015 | Method for the operation of a hearing aid device or hearing device system as well as hearing aid device or hearing device system For reducing feedback-conditioned oscillations in a hearing aid device, microphone signals of a first microphone and of a distanced, second microphone are compared to one another. When oscillations are detected at the same frequency in both microphone signals, these... | 03/14/2006 |
| 6977653 | Surround sound display A surround sound display has a graphic sound stage image, including speakers representing sources and a central listener, and bent correlation meter scales for each stereo channel. The correlation meter scales have values from +1 at one end to −1 at the other end ... | 12/20/2005 |
| 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 |
| 6748085 | Computer system with a common audio input for its audio circuitry A portable computer system includes an audio circuit and a common audio input socket coupled to the audio circuit. This audio circuit has a controller and two amplifiers. Two types of external audio devices is to be coupled to the common audio input socket. The cont... | 06/08/2004 |
| 6738480 | Method and device for cancelling stereophonic echo with frequency domain filtering The filtering coefficients of a frequency domain stereophonic echo canceller are adapted by a method which takes account of the cross-correlation between the input signals relating to the two channels. In particular, the adaptation process takes account of the coher... | 05/18/2004 |
| 6496584 | Multi-channel stereo converter for deriving a stereo surround and/or audio center signal A multi-channel stereo converter is described comprising stereo magnitude determining means for generating a stereo information signal (a/b; .rho.), which represents a degree of stereo between audio input signals (L, R), and transforming means for transfo... | 12/17/2002 |
| 6021204 | Analysis of audio signals Apparatus for analyzing audio signals from a stereo pair of audio channels, comprises: means for detecting the magnitudes of the audio signals of the two audio channels; first detector for detecting a degree of phase correlation between the audio signals ... | 02/01/2000 |
| 5974153 | Method and system for sound expansion Monaural inputs are accepted for presentation to a pair of speakers. The output sound image from that pair of speakers is such that a listener will perceive that the sound is stereo and that certain sounds come from a non-existent center speaker and that ... | 10/26/1999 |
| 5774555 | Switched capacitor bandpass filter for detecting pilot signal An apparatus for detecting a pilot signal. A phase detector detects a phase difference between a filtered amplitude-modulated pilot signal and a frequency divided signal, and a low pass filter low-pass-filters the phase difference. A voltage-controlled os... | 06/30/1998 |
| 5751819 | Level meter for digitally-encoded audio For professional audio operations such as recording and broadcasting, an LED bar-graph display instrument monitors average and peak loudness levels of stereophonic audio signals that have been encoded in serial digital format such as AES/EBU digital audio... | 05/12/1998 |
| 5703953 | Monaural signal judgement circuit An improved monaural signal judgement circuit which is capable of judging whether or not an input signal is monaural when signals from a television, a video cassette tape recorder, an audio cassette tape recorder, a compact disc player, or the like are in... | 12/30/1997 |
| 5655025 | Circuit for automatically recognizing and receiving mono and stereo audio signals In a mono/stereo input circuit for use in an audio equipment, and more particularly in a circuit for automatically recognizing and receiving mono/stereo audio signals, although a mono connector is inserted into a stereo jack, such an insertion of the mono... | 08/05/1997 |
| 5499300 | Stereo and dual audio signal identifying circuit A stereo and dual audio signal identifying circuit including an FM detector receiving a second intermediate frequency signal, a bandpass filter, an AM detector. The circuit further including an amplifier having a first input receiving an output signal fro... | 03/12/1996 |
| 5432855 | Stereo and dual audio signal identifying system A stereo and dual audio signal identifying system comprising, an FM detector, bandpass filter, and AM detector which generate a filter/detected input to a first PLL having a 210 Hz reference signal. The first PLL generates a first input to a comparator an... | 07/11/1995 |
| 5375188 | Music/voice discriminating apparatus A music/voice discriminating apparatus is composed of a signal processing portion for effecting the signal processing upon input acoustic signals, a music/voice deciding portion for discriminating whether the input acoustic signals are music or voice, a f... | 12/20/1994 |
| 5272756 | Method and apparatus for determining phase correlation of a stereophonic signal A method and apparatus used for determining phasing correlation between left-channel and right-channel signals of a stereophonic audio signal is provided. The determination of the phase correlation is facilitated by deriving centrally localized components... | 12/21/1993 |
| 5210796 | Stereo/monaural detection apparatus A stereo/monaural detection apparatus for detecting whether two-channel input audio signals are stereo or monaural, wherein the level difference between the input audio signals is calculated, and after the signal representing the level difference is discr... | 05/11/1993 |
| 5201001 | Pilot signal cancelling system Disclosed is a pilot signal cancelling system employed in an FM stereo receiver which does not cause deterioration of the S-N ratio. The system includes an input terminal for inputting a composite signal; a level detector for verifying the level of a pilo... | 04/06/1993 |
| 5103480 | FMX identification signal detection apparatus There is provided a FMX ID signal detection apparatus for discriminating between a FM broadcasting by means of a FM signal including a sum and difference signals M and S obtained from stereophonically related audio frequency source signals by matrix proce... | 04/07/1992 |
| 5054071 | Volume control for optimum television stereo separation Volume control for use in a cable television set top converter or the like is calibrated for optimum television stereo channel separation. The volume control controls the volume to predetermined levels. One of the predetermined levels is a particular leve... | 10/01/1991 |
| 5050237 | Radio receiver having automatic bandwidth control during tuning In this radio receiver, the charge on a capacitor (14) controls the bandwidth of filters in the receiver's audio circuits. When tuning the radio, a bandwidth control circuit (13) forces this capacitor (14) to discharge, thereby forcing the audio path to b... | 09/17/1991 |
| 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 |
| 4944011 | Circuit for controlling operator indicators in an AM stereo receiver Disclosed is a circuit for controlling the activation of a stereo indicator and a tune indicator in an AM stereo receiver. In the preferred embodiment, a pilot tone detector is employed to determine if the input signal is a stereo signal and an AGC is use... | 07/24/1990 |
| 4908868 | Phase polarity test instrument and method The relative phase polarity between two acoustic or electric signals is determined easily, quickly and conclusively with a hand-held instrument providing immediate visual polarity indication. Built-in dual-channel amplification enables a pair of microphon... | 03/13/1990 |
| 4747141 | AM stereo signal decoder A simplified stereo signal decoder is disclosed for use in an AM stereo receiver which receives composite AM stereo broadcast signals comprising a radio frequency carrier wave having amplitude modulation representing stereo sum (L+R information and phase ... | 05/24/1988 |
| 4712241 | Broadcast signal detected indication system In a radio having an in phase multiplier (A) for providing an in phase detected signal, a detection unit for receiving this signal and for determining whether this signal includes any negative polarity components which would indicate that a viable broadca... | 12/08/1987 |
| 4691358 | Stereo image display device An apparatus is disclosed which provides a display of the stereo image and aural perspective of stereophonic sounds. Left and right signal are processed to form rectified sum and difference signals which are applied to the signals which are applied to the... | 09/01/1987 |
| 4680792 | Demodulator comprising an indicator circuit for use in common to cancellation of a pilot signal and an indication of a reception state In a demodulator comprising an indicator (31) for indicating either stereo reception or monaural reception, an indicator circuit (30) is used to cancel a pilot signal included in a stereophonic signal and to produce a drive signal for driving the indicato... | 07/14/1987 |
| 4661994 | Frequency and volume display for a receiver A receiver having a tuner for tuning to a desired broadcast station and connected with a detector through which a demodulated signal is supplied as an input signal to a function selector which receives at least one other input signal from another source t... | 04/28/1987 |
| 4644580 | Sound-multiplexed TV signal demodulator having electrically independent stereo and SAP demodulation means A sound-multiplexed TV signal demodulator includes a stereo demodulation means having a first phase-locked loop of a first voltage controlled oscillator and also having a first frequency divider and a first comparator, an L-R demodulator and a matrix circ... | 02/17/1987 |
