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8165316 |
Portable terminal
According to an aspect of the invention, a portable terminal includes: a first audio input-output unit and a second audio input-output unit configured to receive audio when a mode is set as an...
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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...
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8139772 |
System and method for estimating channel condition based on filtered pilot energy signal
A receiver may estimate a channel condition based on a difference between a pilot energy signal and a filtered pilot energy signal. The receiver may further switch to a stereophonic mode when both...
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8139771 |
System and method for switching a mode of a receiver using block estimation
A system and method for switching a mode of a receiver between a monophonic and stereophonic mode is disclosed. The method can include generating a residual signal indicative of a noise level...
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8093841 |
System and method for faster response time in stereo/mono detection
An audio receiver may include a mono/stereo detector that causes the audio receiver to output either a monophonic or a stereophonic signal based on a difference between a pilot energy signal and a...
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7921016 |
Method and device for providing 3D audio work
A method for providing a 3D audio work includes providing a one-ear HRTF filter and a related function synthesizer storing a related function therein, and inputting sound signals into the one-ear...
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7889871 |
Apparatus for multichannel sound reproduction system
The sound reproduction of a multichannel sound reproduction system with a plurality of speakers which is connected to the output of an FM stereo receiver is controlled by a control signal derived...
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7835772 |
FM output portable music player with RDS capability
A FM output portable audio player is provided for digitally coupling audio signals generated therein to be broadcast through a radio receiver system, such as an automobile radio. The audio player...
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7751571 |
Sound signal processor and method for processing sound signal using the same
A sound signal processor and a method for processing a sound signal using the same enables the elimination of a plop noise generated in the course of a sound mode checking operation. The sound...
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7715567 |
Noise reduction in a stereo receiver
A method of denoise a stereo signal comprising a stereo sum signal and a stereo difference signal, performs a frequency selective stereo to mono blending based on the masking effect of the human...
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7574264 |
Multirate cochlear stimulation strategy and apparatus
A cochlear implant system in which information about the periodicity of a received audio signal in each filter channel is used as a factor in determining the rate of stimulation applied to a...
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7472058 |
Automatic audio source detection for capture devices
A method for selecting an audio source when capturing audio data with at least one capture device includes connecting an audio source to an audio input port of the capture device, turning off the...
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7457420 |
Method and system for detecting signal modes in a broadcast audio transmission
A Japanese BTSC audio broadcast signal has three modes of transmission: mono, stereo, or dual mono. The control channel centering at 3.5 fH is one of the three channels in the J-BTSC signal, and...
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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...
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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...
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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...
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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...
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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...
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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; ρ), which represents a degree of stereo between audio ...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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4602379 |
Dual indicator circuit for tuning and stereo signals
In a stereophonic broadcasting receiver, a single indicator with two levels of illumination serves to provide indication of both accurate tuning and the presence of stereophonic signals. One signal...
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4503397 |
AM Stereo pilot signal detection circuitry
A stereo pilot signal detector for an AM stereo receiver connects an input signal to a train of pulses corresponding to zero crossings of the input signal. These pulse lock a shift register having...
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4464781 |
Equalizer apparatus
An equalizer apparatus for audio equipment capable of selecting between a 2-speaker system and a 4-speaker system, including a display device indicating proper operation of the control knobs of the...
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4455673 |
Stereo indicating circuit
In a circuit for indicating reception of stereo signals (for use in e.g. a radio tuner or television) audio signals prevailing in the left (L) and right (R) output channels are applied to...
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4454607 |
FM Stereophonic receiver with CPU controlled tuning and demodulating
An FM stereophonic receiver is arranged so that a central processing unit assigned for selection of a broadcasting station is burdened, based on a clock pulse of the central processing unit, to...
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4404432 |
Stereo identifying signal detection device
A stereo identifying signal detection device, with a circuit for phase detecting a received stereophonic broadcast signal and detecting a stereo identifying signal, an exclusive OR circuit for...
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4399329 |
Stereophonic bilingual signal processor
The format of two audio input signals, which may be of either matrixed form wherein each signal comprises two common components or of unmatrixed form wherein each signal comprises a respective...
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4388493 |
In-band signaling system for FM transmission systems
An in-band signaling system for injecting at least one low frequency audio tone into an audio stereo signal includes a tone generator circuit and a circuit for generation of first and second...
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