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7558391 |
Compander architecture and methods
Compander architecture and method for ensuring that the components of an output signal are synchronized includes calculating a gain calculation for an input signal, detecting a predetermined...
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7003469 |
Audio signal processing apparatus and method thereof
A digital audio signal to be replayed is processed in a waveform thereof. A frequency bandwidth of the audio signal is expanded through conversion of a sampling frequency, and then the audio signal...
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6946850 |
Method and apparatus for filtering unwanted noise while amplifying a desired signal
A method and an apparatus for detecting signals in an electromagnetically noisy environment by detecting electromagnetic signals comprising a noise signal and a known signal, and compressing the...
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6937912 |
Anti-aliased clipping by band-limited modulation with step functions
A method for computing the “clippings” of an audio signal in the digital domain to prevent aliasing is disclosed. An offset signal is found by subtracting a threshold from samples of the audio...
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6807280 |
Audio signal processing circuit for reducing noise in an audio signal
An audio signal processing circuit reduces noise in an incoming audio signal and is particularly useful in telephone communication systems utilizing one or more hands-free microphones. A preferred...
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6760452 |
Multi-channel audio signal limiter with shared clip detection
An audio system limits gain in individual audio channels having a shared clip detect signal from a multi-channel power amplifier such that only channels likely to be exceeding the distortion...
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6714093 |
Dynamics compressor for an analog signal to be compressed
In a dynamics compressor, an analog signal to be compressed is supplied to a first amplifier stage as an input signal, and the output signal thereof is supplied to the next amplifier stage as an...
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6678382 |
Digital attenuator
Apparatus and a concommitant method for generating an approximation of a logarithmically attenuated value of a digital signal in predefined increments. Specifically, the apparatus comprises a shift...
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6675125 |
Statistics generator system and method
A method and system for monitoring, maintaining and analyzing statistical performance information in a signal processing system includes collecting data representing a plurality of aspects of the...
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6621367 |
Signal power dynamic range compressing circuit and power amplifier using the same
In an input signal power dynamic range compressing circuit, an input signal is distributed by a directional coupler to a linear signal transfer path and a compressing signal generating path, and in...
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6597301 |
Apparatus and method for level-dependent companding for wireless audio noise reduction
Apparatus and method that mitigate the noise incurred on a wireless communications path between an encoder and a decoder of a wireless audio noise reduction system that utilizes frequency...
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6552591 |
Method and apparatus for processing a wide dynamic range signal
Method and apparatus are provided for processing a wide dynamic range analog signal which comprises a compressive nonlinear transfer function responsive to the average amplitude of the signal...
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6542612 |
Companding amplifier with sidechannel gain control
A companding amplifier wherein compression data is provided to an expansion circuit along with audio data. An analog audio input signal is compressed and converted into digital data by a...
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6518852 |
Information signal compressor and expander
An apparatus and method for compressing and expanding an information signal for use in noise reduction which includes an input terminal to receive the information signal, a first frequency...
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6297695 |
High volume expander circuit
The present invention is directed to a circuit for performing volume expansion on an audio signal. The circuit includes an amplifier that has an input side and an output side. Further, the...
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6169808 |
Signal compressing circuit
The present invention relates to a signal compressing circuit which amplifies an input signal on a logarithmic scale in an appropriate range, and has a variable gain stage, an input signal...
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6107879 |
Automatic dynamic range control circuit
An automatic dynamic range control circuit is provided with a fixed-gain first circuit means and a variable-gain second circuit means having substantially the same propagation delay as the first...
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6054895 |
Apparatus and method for pre-distortion correction of a power amplifier stage
In an amplifier circuit having an amplifier path, a new pre-distortion arrangement is provided. The amplifier circuit includes a signal source, an intermediate amplifier stage, and a power...
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6037838 |
Amplifier with programmable gain and input linearity usable in high-frequency lines
An amplifier with programmable gain and input linearity at high frequency allows an increase in the gain without effecting input linearity and without significantly increasing current consumption....
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6023191 |
Method and apparatus for detecting an input signal
A level detector detects an input signal level. A rectifier (210) receives the input signal and provides a rectified signal. A prefilter (220) receives the rectified signal and attenuates high...
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5923768 |
Digital audio processing
Digital audio processing apparatus for applying a time-varying gain to an input digital audio signal over contiguous first, second and third time periods, in which: the applied gain changes at no...
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5892834 |
Audio level dynamic range compression
An audio level dynamic range compression circuit 1 comprises a variable gain amplifier 6, an audio signal level averaging stage 8, an analog-to-digital converter 10, and a digital processor 12. The...
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5822442 |
Gain compression amplfier providing a linear compression function
An amplifier uses gain compression techniques to provide linear gain control over a wide dynamic range, and includes an amplifier having input and output legs, a gain controller coupled between the...
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5793315 |
Bit-serial digital expandor
A bit-serial digital expandor includes a bit-serial dual scaler block (340), a bit-serial rectifier block (320), a bit-serial lowpass wave digital filter block (350), a bit-serial scaler with...
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5781848 |
Mobile telephone device wherein a compressor circuit performs amplitude compression such that a less variable gain is given to an audio signal having a lower level range than an audio signal having a higher level range
In a mobile telephone device, the audio compressor (21) performs amplitude compression by giving a less variable gain to an input audio signal which is of a lower level range than it does for an...
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5737434 |
Multi-band audio compressor with look-ahead clipper
An audio peak limiter suitable for use between a compressor and pre-emphasis circuit. The limiter uses a center clipper to develop a control signal for a 1/x control law VCA. The center clipping,...
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5731695 |
Voltage limiter circuit
First and second analogue signal processing circuit has first to fourth input terminals and first and second output terminals, and functions such that the first and second output terminals have an...
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5727075 |
Multipoint communication apparatus with reduced number of audio decoders
A multipoint communication apparatus receives a set of audio signals encoded by gain-shape vector quantization. A gain detector in the multipoint communication apparatus dynamically selects a...
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5706356 |
Audio processor
An audio processor (10) that is specifically designed to be included in combination with an audio recording system or a movie theater sound system. The processor (10) consists of two major...
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5633939 |
Compander circuit
A compander circuit includes first and second volume controllers, a comparator, a counter and a control part. The comparator compares a compared voltage with a rectified and smoothed signal of an...
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5631968 |
Signal conditioning circuit for compressing audio signals
A signal conditioning circuit compresses an audio signal by producing a gain signal that is a function of the time-averaged audio signal and a compression ratio, and amplifying the audio signal by...
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5631648 |
Signal compression or expansion circuit for mobile communication
A signal-processing circuit adapted for signal compression and expansion performed in the transmitter and receiver of mobile communication equipment. The signal-processing circuit comprises a...
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5596646 |
Audio tape saturation simulator
An analog tape saturation simulator produces the same results as analog tape saturation in a controllable environment which can be user adjusted to the desirable level of saturation effect. A...
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5537477 |
Frequency characteristic shaping circuitry and method
Frequency characteristic shaping circuitry having a plurality of bandpass filters to which an audio signal is supplied and a plurality of variable gain attenuators individually associated with the...
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5515446 |
Electronic audio accurate reproduction system and method
An electronic audio processing system for insertion into the line prior to power amplification and a related method are disclosed which component and method render a frequency response in which...
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5495468 |
System and method for transmitting plural information waveforms over a single communications channel using lincompex techniques
At least two information waveforms are transmitted over the same communications channel using Lincompex techniques. Each of the information waveforms are modulated using Lincompex techniques to...
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5493699 |
Low noise communication analog compressor and analog expander
A signal processing circuit includes two analog signal processors, an operational amplifier, a rectifier, and a reference potential generator. Each analog signal processor has four input terminals...
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5485524 |
System for processing an audio signal so as to reduce the noise contained therein by monitoring the audio signal content within a plurality of frequency bands
The invention relates to a system for processing an audio signal to reduce the noise contained therein, the system comprising a source (1) of an audio signal in electric form, a first filter group...
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5483600 |
Wave dependent compressor
An audio compressor using interactive layered time constants to create an easy to use compressor which self adapts to the program characteristics and provides a desirable and pleasing effect over a...
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5471651 |
Method and system for compressing the dynamic range of audio signals
An audio signal has its dynamic range compressed by a system which first samples a block of the audio signal (10), typically several seconds long. The level of the signal in this block is analyzed...
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5463695 |
Peak accelerated compressor
A peak accelerated compressor comprising a voltage controlled amplifier, a level detector and a peak accelerated filter circuit. The voltage controlled amplifier circuit is utilized for processing...
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5451949 |
One-bit analog-to-digital converters and digital-to-analog converters using an adaptive filter having two regimes of operation
One-bit analog-to-digital converters (ADCs) and digital-analog-converters (DACs) employ an adaptive filter. The filter has two regimes of operation: variable gain within the passband of the filter...
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5444788 |
Audio compressor combining feedback and feedfoward sidechain processing
An audio compressor having both a feedback compressor and a feedforward compressor. The feedback compressor operates so as to provide envelope detection. A sidechain processor which receives an...
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5396562 |
Signal processing circuit for audio apparatus
A signal processing circuit for an audio apparatus has a variable gain amplifier whose gain is varied in accordance with a gain controlling signal supplied thereto. The signal processing circuit...
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5375255 |
Radio receiver comprising analog dynamic compression and digital expansion
A radio receiver for an RF signal which is phase or frequency modulated by an information signal. The receiver has an analog receiving section which provides non-linear dynamic compression. The...
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5303308 |
Audio frequency signal compressing system
An audio frequency compressing system for amplifying an input signal to produce a power output signal while removing high-level signals which could harm a listener. Gain control in the feedback...
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5298811 |
Synchronous logarithmic amplifier
A synchronous progressive-compression type logarithmic amplifier includes one or two channels of amplifier/limiter stages and a corresponding multi-stage synchronous demodulator circuit to provide...
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5293139 |
CMOS-compander
The invention relates to a compressor and an expander for use in a compander realized in CMOS-technology which is used to improve speech quality in mobile phone systems AMPS (NAMPS), NMT and TACS...
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5255325 |
Signal processing circuit in an audio device
A signal processing circuit in an audio device includes a variable gain control section for providing a variable amplification gain to an input signal in response to a gain control signal, an input...
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5245299 |
Compandor with DC-coupled compressor
A compandor circuit uses a DC-coupled compressor to reduce the required IC package size to 8-pins. A delta gain stage and rectifier in the feedback path of the compressor circuit receive the AC and...
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