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RE40960 |
Switched signal processing circuit
An expander circuit for decoding audio signals which were encoded in accordance with the BTSC multichannel sound system standard including DBX commanding is presented. A wideband expander circuit...
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7526430 |
Speech synthesis apparatus
A speech synthesis apparatus, which can embed unchangeable additional information into synthesized speech without causing a deterioration of speech quality and restriction by bands, includes a...
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7486796 |
Stereo receiver for controlling continuously degree of separation
A stereo receiver of a simple structure is disclosed capable of continuously controlling the degree of separation of left and right voice signals in accordance with the level of electric field...
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7382887 |
Method and device for reducing high frequency error components of a multi-channel modulator
A method and device for reducing error components of a multi-channel modulator. The method comprises the steps of inverting substantially half of the channels of a modulator, and reducing error...
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7362872 |
Method for noise reduction of a FM signal
A compander for noise reduction of a FM signal is described, wherein a group delay (τ) linked to the generation of the compressor gain (c c (t)) is equalised during generation of the multiplex...
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7330518 |
Distortion compensation circuit, and a transmission apparatus including the same
Predistortion effective for a power amplifier with the memory effect is provided. An A/D converter digitizes a signal voltage value after quadrature modulation, and the result is supplied to a...
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7313240 |
Noise reduction in a stereo receiver comprising an expander
A FM broadcast compander system is combined with a conventional denoising system suited for FM receiver, wherein a noise indicator is determined by a subtraction of the conventionally transmitted...
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7305046 |
I/Q modulator with carrier predistortion
An I/Q modulator used for processing an I/Q signal to obtain a predistorted output signal. The I/Q signal has an I component and a Q component, and comprises a predistorter for predistorting, with...
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7292694 |
Noise reduction in a stereo receiver
A method to denoise a stereo signal which comprises a stereo sum signal (U s (z)) and a stereo difference signal (U d (z)), wherein a stereo to mono blending on basis of an attenuation of the...
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7239710 |
Stereo radio receiver with noise suppression
For the purpose of largely suppressing the noise pulses caused in a stereo radio receiver in the reception signal, particularly by the ignition system of a motor vehicle, a digital field strength...
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7110549 |
Noise reduction in a stereo receiver
A method to 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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7043026 |
Method for removing AM neighboring interference and a circuit for the same
An AM neighboring interference removing method and circuit is provided which can select only a desired AM modulation wave even if an interference AM modulation wave is partially superposed upon the...
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6944301 |
Method and apparatus for discriminating multipath and pulse noise distortions in radio receivers
Distortion discrimination circuitry for digital radio receivers and corresponding methods are disclosed that accurately and efficiently discriminate distortion events, including impulse noise and...
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6925114 |
Weak signal processing based on impulse noise blanking
An improved noise reduction system ( 20 ) is provided for a radio frequency audio processor having one or more weak signal processing components for generating one or more corresponding control...
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6914987 |
Audio amplifier with voltage limiting in response to spectral content
Audio signals are reproduced with consistent perception of total harmonic distortion even with varying spectral content of a particular audio signal without separately limiting different frequency...
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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...
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6690805 |
Audio signal noise reduction system
An audio signal noise reduction system comprises a noise detecting circuit 11 for detecting a noise from an audio signal and outputting a detection signal indicating a start time and an end time...
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6658116 |
Stereo radio receiver
A stereo radio receiver has a channel separation stage for setting an optimal channel separation of the left audio channel from the right audio channel, even under sufficient receiving field...
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6654471 |
Method, equipment and recording device for suppressing pulsed interference in analogue audio and/or video signals
Clicks in voice and music signals are removed by detecting and interpolating the click. The use of a permanently set threshold value above the peak value of the audio signal is known for detecting...
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6574458 |
Method for generating a frequency-modulated signal with improved receivability by a radio receiver
A method for generating a frequency-modulated signal with high receivability quality, comprising the steps of: before sending an input modulating signal to a modulator, modifying the input...
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5982901 |
Noise suppressing apparatus capable of preventing deterioration in high frequency signal characteristic after noise suppression and in balanced signal transmitting system
A noise suppressor has signal detecting device 1 for detecting signals A and B on signal lines, sum signal generating device 21 for summing the detected signals, difference signal generating device...
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5960037 |
Encoding of a plurality of information signals
The apparatus for encoding a plurality of digital information signals, having at least a first input unit for receiving a first digital information signal and a second input unit for receiving a...
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5812673 |
Noise suppressing device
It is a primary object of the invention to provide a noise suppressing device in which the function to suppress or remove the noise is more improved than the conventional device. The invention...
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5784465 |
Stereo receiver
The invention is directed to reducing noises of a low density without causing the listener to feel a sense of incongruity. A received signal is subjected to frequency discrimination. The sound...
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5710995 |
Adaptive antenna receiver
An FM radio receiver, particularly for mobile receivers, reduces the effects of multipath distortion. It selects either an adaptive process (constant modulus algorithm or CMA) or a antenna...
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5701345 |
Multipath interference reduction system and method
A multipath interference reduction system and method for smoothly reducing noise associated with FM stereo signal reception with an adjustable blend. The system includes a peak detector for...
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5699432 |
Circuit for mobile radio receivers
In a circuit for mobile radio receivers with a device for setting the stereo reproduction portion relative to the mono reproduction portion as a function of changes in the reception field strength,...
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5682432 |
Broadcast receiver
In a broadcast receiver, a dynamic compression of the signal is switched on or off in dependence on whether such a compression has been carried out at the transmitting end. An identification bit is...
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5673324 |
Radio receiver circuit for deriving at least one reception quality signal
In a circuit for deriving at least one quality signal that is dependent on the quality of a received signal, where the received signal is demodulated, a first auxiliary signal which is dependent on...
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5671286 |
Strategy for controlling FM stereo separation and frequency response in noisy reception environments
A control for an FM receiver reduces multipath distortion by reducing stereo separation and high frequency response in the demultiplexed signal. The receiver includes an FM detector including a...
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5661810 |
Circuit arrangement for deriving signals for masking audio signals
The circuit arrangement includes a first low-pass filter (2) for filtering an input signal (H3) proportional to the strength of a received radio signal; a second low-pass filter (3) for filtering...
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5661809 |
Radio receiver having digital signal processing
A radio receiver is provided having digital signal processing, a first and a second auxiliary signal derived from a received stereo multiplex signal, the first auxiliary signal being dependent upon...
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5631963 |
Circuit arrangement for the recognition of adjacent channel interference
A circuit arrangement for recognizing adjacent channel interference in a stereo radio receiver, in which a stereo multiplex signal is present. An adjacent channel interference signal is obtained as...
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5610991 |
Noise reduction system and device, and a mobile radio station
A noise reduction system and device, and a mobile radio station. Known is a combined Zelinski-spectral subtraction system (1) for noise reduction in a combined speech signal (a(t)) in which signals...
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5606619 |
Circuit arrangement for deriving a signal indicating noise in a received stereo multiplex signal
A circuit arrangement for deriving the signal indicating noise in a received stereo multiplex signal, wherein the stereo multiplex signal is present as a digital signal with a first sampling rate...
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5594799 |
Circuit for suppression of short-lived noise-phenomena in a digital audio signal
In a circuit for suppressing short-lived noise phenomena in a digital audio signal, in particular during a temporary test reception of another transmitter, the audio signal is multiplied by a...
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5586192 |
Method of and device for detecting pulsatory interference signals in a sound signal
For detecting pulsatory interference in a sampled audio signal, the value of a given signal sample is compared with the values of previous as well as subsequent signal samples within a selected...
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5535280 |
Circuit for removing ignition noise from a multiplex signal
In a digital circuit which removes ignition noise from a multiplex signal in a radio receiver, especially in a car radio, the multiplex signal is supplied via a high-pass filter (3) and a squaring...
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5506906 |
Radio receiver station-seeker stop-signal generator
Radio receivers which scan through a predetermined band of the radio spectrum, in a station-seeking mode, must independently detect whether the currently tuned frequency is the central frequency of...
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5410751 |
Controlling muting, high frequency components and blending to reduce FM noise
An FM noise reduction circuit including a level detection circuit receiving an intermediate frequency signal. The level detection circuit rectifies the intermediate frequency signal, and outputs a...
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5408685 |
Multipath detector using phase comparison of stereo pilot signal
A frequency modulation (FM) stereo broadcast receiver detects the onset of multipath interference based on phase changes in the received stereo pilot signal. In a preferred embodiment, the phase of...
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5379449 |
Automotive radio employing multipath correction strategy based on vehicle speed
An automotive radio system employs a plurality of corrective actions in response to the detection of multipath interference to reduce distortion audible to a listener. The speed of the vehicle is...
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5377272 |
Switched signal processing circuit
An expander circuit for decoding audio signals which were encoded in accordance with the BTSC multichannel sound system standard including DBX commanding is presented. A wideband expander circuit...
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5373562 |
Signal processor for sterophonic signals
An expander circuit for decoding audio signals which were encoded in accordance with the BTSC multichannel sound system standard including DBX companding is presented. A wideband expander circuit...
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5359661 |
Out-of-lock detector for synchronous AM detection
An AM stereo receiver in which a synchronous in-phase signal is determined comprises a low pass filter circuit for determining an average DC value of the synchronous in-phase signal, a reference...
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5337196 |
Stereo/multivoice recording and reproducing video tape recorder including a decoder developing a switch control signal
A stereo/multivoice recording and reproducing apparatus used for a high fidelity video tape recorder comprises a multi-channel television system (MTS) decoder for demodulating stereo and multivoice...
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5315660 |
Wideband expander for stereo and SAP signals
A decoding arrangement for decoding audio signals previously encoded in accordance with the dbx format, includes a wideband expander instead of a full dbx expander. The wideband expander employs a...
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5261004 |
Noise blanking circuit for AM stero
An AM stereo input signal is processed by an envelope detector, an in-phase detector and a quadrature phase detector to yield outputs which may carry short noise impulses. Each output is low pass...
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5257312 |
Time-discrete stereo decoder
A receiver having a signal path incorporating a tuner, a demodulator circuit for supplying a stereo multiplex signal having a baseband stereo sum signal (L+R), a 19 kHz stereo pilot and a stereo...
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5255319 |
Noise suppressing circuit in an FM tuner
A noise suppressing circuit has a gate for controlling a composite signal applied to a stereo demodulator of an FM tuner, and a detector for detecting a noise included in the composite signal and...
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