Matches 101 - 150 out of 311 < 1 2 3 4 5 6 7 >
Match Document Document Title
5881157 Apparatus for compensating a frequency characteristic of a reproduction audio signal  
An apparatus for compensating a frequency characteristic of a reproduction audio signal removes noise from the reproduction signal in the high-frequency region during reproduction of the audio...
5870705 Method of setting input levels in a voice recognition system  
A computer implemented voice recognition method and system for adjusting an input level to adjust the input signal amplitude level of spoken words to enhance voice recognition. A user is prompted...
5838807 Trimmable variable compression amplifier for hearing aid  
An improved analog hearing aid is provided which incorporates a current source transconductance amplifier as an input stage. The gain defining bias current of the input stage transconductance...
5832097 Multi-channel synchronous companding system  
A multi-channel synchronous compander for hearing aids, in which the input signal from an input transducer is directed through a 2:1 front compressor, then through a band splitting filter to divide...
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...
5805715 Method and apparatus for compensating multi-resolution linear distortion  
A distortion compensation apparatus heightens resolution of a low frequency domain among the audible frequency band, and relatively lowers the resolution in the higher frequency domain. By...
5784476 Audio signal reproduction apparatus  
Audio signal reproduction apparatus, for example, an in-car entertainment system, includes a number of audio signal sources (I--I to I-N) which are selected by means of a selector (2) and fed to an...
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...
5771301 Sound leveling system using output slope control  
A sound leveling system for maintaining an output signal below a slope of predetermined maximum output levels includes a signal adjusting circuit, an integrator, and a peak rate limiter circuit....
5757938 High efficiency encoding device and a noise spectrum modifying device and method  
An apparatus and method for processing an input digital signal in which an input digital audio signal at an input terminal 11 is supplied via a one-block delay unit 17 to a difference unit 20, an...
5754973 Methods and apparatus for replacing missing signal information with synthesized information and recording medium therefor  
A signal processing method is provided which detects a signal dropout portion in the input signal and which modifies the detected signal dropout portion with a signal derived from the portion in...
5751824 Method of stabilizing the level of an audio signal in television broadcasting  
To prevent particular transmission equipment from artificially increasing low level audio signals to a predetermined allowable level, such signals are first summed with a stabilization signal...
5745585 Dynamic equalization method and device  
Equalization method for the amplification of audiofrequency signals that uses a first component for the correction of the response curve for the stationary mode, at least a second component for...
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,...
5736897 Low input signal bandwidth compressor and amplifier control circuit with a state variable pre-amplifier  
A state-variable pre-amplifier responsive to a program input signal drives a filter circuit, and an absolute value circuit. The state-variable pre-amplifier uses a state-variable filter to provide...
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...
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...
5724433 Adaptive gain and filtering circuit for a sound reproduction system  
Adaptive compressive gain and level dependent spectral shaping circuitry for a hearing aid include a microphone to produce an input signal and a plurality of channels connected to a common circuit...
5708722 Microphone expansion for background noise reduction  
Disclosed is an apparatus for reducing background noise in a telecommunications device, the telecommunications device including a microphone for receiving acoustic sights and generating...
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...
5706357 Sound signal output circuit and method  
A sound signal output circuit and method which controls the volume every time a new signal source is selected which has a different modulation degree, than the previous signal source and which...
5701353 Audio signal processing circuit for compressing or expanding audio signal in which output DC voltage is controlled in response to reference voltage  
A DC voltage comparator is provided on the input side of an amplifier of an electric current controlled type. The DC voltage comparator compares the DC voltage on the input side of the amplifier...
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...
5640460 Amplitude adjust circuit and method thereof  
An amplitude adjust circuit (10) provides a scaled representation (36) of an analog audio signal (28) with substantially zero DC offset relative to a reference voltage. A voltage reference...
5640685 Mobile telephone device wherein an adder supplies a sum of audio and out-of audio band signals to a compressor circuit  
In a mobile telephone device, an adder (17) calculates a sum of (a) an audio signal comprising a talk signal component and a noise component and (b) a generated signal having an out-of audio...
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...
5633937 Method for processing signals  
Method and apparatus for processing signals, in particular audio signals for hearing aids. A delay-free processing of signals is achieved in that at first a momentary amplitude signal A(t) is...
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...
5613010 Apparatus for reproducing sound with a reduced dynamic range  
An open-loop speaker amplifier and a dynamic range reduction circuit are disclosed. The speaker amplifier includes a bridge driver and a bridge circuit. The bridge circuit includes a first set of...
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...
5594408 Potentiometer  
A digital potentiometer adapted for and connected to and interacting directly with a plurality of external switches. Specifically, the various wiper points of a semiconductor resistor array are...
5586193 Signal compressing and transmitting apparatus  
Audio signals are compressed by selecting either a first compression mode providing high-quality sound and a relatively long processing time or a second compression mode having a shorter processing...
5579404 Digital audio limiter  
A signal processing system comprising components such as split-band perceptual coders can receive a peak amplitude limited input audio signal and can process the signal in such a manner that the...
5577126 Overload protection circuit for transducers  
This invention relates to an arrangement (1) for protecting transducer (3) which converts an electric signal into an acoustic or a mechanic signal against overload and destruction. The arrangement...
5574791 Combined de-esser and high-frequency enhancer using single pair of level detectors  
Two level detectors with logarithmic outputs receive an input audio signal. The first level detector receives the signal through a high-pass filter while the second level detector receives the...
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...
5528696 Hearing aid  
A hearing aid with a microphone, a preamplifier connected behind it which is connected to a signal processing voltage-controlled circuit which is provided with a voltage-controlled filter, for...
5528695 Predictive protection arrangement for electroacoustic transducer  
This invention relates to an arrangement (14) for protecting a transducer (2) which converts an electric signal into an acoustic or a mechanic signal against overload and destruction. The...
5524060 Visuasl dynamics management for audio instrument  
A digital audio gain control system has an operator interface with a CPU, RAM storage, and input devices for a user to store transfer characteristics relating gain to be applied to an incoming...
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...
5500902 Hearing aid device incorporating signal processing techniques  
A hearing compensation system for the hearing impaired comprises an input transducer for converting acoustical information at an input to electrical signals at an output, an output transducer for...
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...
5488668 Multiband programmable compression system  
An improved audio compressor of the type which is used in a hearing aid and having a programmable compression ratio is disclosed. In the preferred embodiment, the compressor includes a variable...
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...
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...
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...
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...
5444785 Echo attaching circuit and audio device using the same  
An analog signal to be delayed thereby is compressed according to a monotonously increasing, convex compression function and sent to a delay circuit constituted digitally. Data of a digital value...
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...
5440643 Audio peripheral mixer circuit and method for noise reduction  
A circuit and method for mixing signals from audio sources provide noise reduction by employing a noise gate to selectively attenuate one of the source signals. The noise gate has a low gain state...
Matches 101 - 150 out of 311 < 1 2 3 4 5 6 7 >