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5832438 |
Apparatus and method for audio computing
A computer for handling audio signals includes, within one box, programmable digital processing circuitry, read/write memory, digital-to-analog circuitry, one or more speakers, and an equalization...
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5828763 |
Speaker system including phase shift such that the composite sound wave decreases on the principal speaker axis
A speaker system for reproducing a high fidelity sound field. In one embodiment, the speaker system includes at least two speakers, one of which is coupled with a phase shifter for shifting the...
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5828755 |
Method and device for processing signals
A method is set forth for processing signals, in particular for treating audio signal, characterized in that it mainly consists in the supply of an input signal (3) to be treated; in the isolation...
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5815585 |
Adaptive arrangement for correcting the transfer characteristic of an electrodynamic transducer without additional sensor
An arrangement is provided for converting an electric signal into an acoustic or a mechanic signal comprising a transducer (1) and an electric circuit connected to the terminals of the transducer...
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5812687 |
Circuit for controlling the frequency and/or phase response of a signal amplification system
A circuit for controlling frequency and/or phase response characteristic of a signal amplification system or channel has a serial architecture composed of a plurality of cells and a selector for...
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5805716 |
Sound system gain and equalization circuit
A multi-band equalizer for receiving and processing an audio signal includes a plurality of operational amplifiers, each for processing a different frequency band of the audio signal to produce an...
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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...
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5802185 |
Slide control system
A slide control system suitable for a graphic equaliser comprises a number of slide controls grouped into sets of at least two and typically three slide controls. Bridge means including a knob or...
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5771296 |
Audio circuit
An audio circuit for use in a television receiver and the like compensates for the capacity shortage of a speaker box or low frequency characteristic of the speaker to reproduce vivid and...
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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...
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5757939 |
Method for demonstrating sound quality differences between audio samples
Methods and apparatus are disclosed for demonstrating sound quality differences between two sound samples by negatively filtering a first of two signal samples and subsequently representing the...
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5754667 |
Audio filter with magnetic field cancellation
An audio filter for use with loud speakers which substantially eliminates magnetic fields emanating from inductors of the filter by the inductors for each channel being physically oriented and...
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5754666 |
Method for reproducing audio signals and an apparatus therefore
When reproducing an audio signal with a conventional audio signal reproducing system, an unnaturalness in the quality of the reproduced sound occurs. The unnaturalness is caused by the frequency...
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5745586 |
Sound quality control system
A sound quality control system according to the present invention precisely and swiftly realizes a sound quality that is desired by a listener, by controlling sound quality based on quantitative...
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5740259 |
Pressure wave transducing
An electroacoustical transducing system for exchanging pressure wave energy with a medium that propagates pressure waves includes an electroacoustical transducer having a vibratile surface. At...
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5737428 |
Circuit for providing visual indication of feedback
A compound differential circuit detects the highest relative signal of a plurality of input signals. Peak detector circuits including a sensing diode and a capacitor, are employed to produce a...
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5734730 |
Apparatus for adjusting a frequency characteristic of an audio signal according to biorhythm principles
An apparatus adjusts the frequency characteristic of an audio signal output corresponding to changes in an individual's biorhythms. The apparatus is composed of a key input unit for receiving...
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5714918 |
Equalizer for digitized signals
In an equalizer with n number of frequency ranges for digitized signals in which by means of n-1 cascaded filter circuits containing parallel connected digital low-pass filters and digital high...
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5708723 |
Recording and reproducing apparatus for audio signal
A recording and reproducing apparatus for an audio signal including a low pass filter removing high frequency components of a predetermined frequency or more of an audio signal having a wide band,...
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5694476 |
Adaptive filter for correcting the transfer characteristic of electroacoustic transducer
An arrangement is provided for converting an electric signal into an acoustic or a mechanic signal comprising a transducer (11), a linear or nonlinear filter (1) with controllable parameters, a...
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5692051 |
Electronic equalization for recessed loudspeaker mounting
An equalizing circuit, for compensating frequency response perturbations in a loudspeaker caused by a recessed mounting of the loudspeaker, includes an input for receiving an audio signal, a...
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5633938 |
Audio track mixing processor
An audio track mixing processor comprising phonic conversion circuitry for receiving a primary audio track of an input audio mix in stereo and transmitting a detector activation signal in mono; a...
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5631967 |
Processing audio signals using a state variable
A continuous stage variable is generated with a state machine of a controller. A level of transmit attenuation and a level of receive attenuation are generated by the controller using the...
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5629985 |
Apparatus and methods for auditory conditioning
In one mode of operation, a signal representation of sound is provided to an audio filter that has transmission characteristics that are controlled by a microprocessor. The output of the audio...
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5617480 |
DSP-based vehicle equalization design system
A DSP-based vehicle equalization design system has been described, which allows the audio engineer to quickly and efficiently design an equalizer from an easy-to-use Graphic User Interface (GUI)...
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5610555 |
Low-voltage driven, audio signal amplifying apparatus and a portable acoustic system using said apparatus
The apparatus includes output stage amplifiers for receiving the respective outputs of preamplifiers provided in correspondence to the left and right channels in a stereo system. Negative feedback...
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5596650 |
Equalizing circuit for a loudspeaker system
The invention provides an equalizing circuit for a loudspeaker system. The circuit includes an output amplifier connected to the circuit output, and a feedback amplifier connected to the circuit...
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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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5586191 |
Adjustable filter for differential microphones
A method and apparatus for providing a differential microphone with a desired frequency response are disclosed. The desired frequency response is provided by operation of a filter, having an...
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5581621 |
Automatic adjustment system and automatic adjustment method for audio devices
A system for automatically adjusting an audio system with a programmable parametric equalizer includes an audio analysis unit that can be connected to the audio unit. The parametric equalizer...
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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...
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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...
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5568559 |
Sound processing apparatus
A sound processing apparatus in which the levels of audio signals from which have been extracted signals of a frequency band lower than a predetermined frequency band are controlled by using...
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5550925 |
Sound processing device
A sound processing device for processing sound is arranged to control an attenuation characteristic for attenuating the low-frequency signal of an input audio signal according to the level thereof,...
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5539833 |
Audio signal amplifier device
An audio signal amplifier device is disclosed, and includes two parallel compass controller circuits (6, 7), each of the circuits (6, 7) having the identical configuration and including a low...
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5533120 |
Acoustic feedback cancellation for equalized amplifying systems
A speaker amplification system incorporates an adaptable notch filter that can dynamically adapt to the frequency of feedback oscillations caused by acoustic feedback frequency in order to remove...
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5530769 |
Equalizer and audio device using the same
An equalizer includes: a first attenuating circuit which receives an input signal and a first control signal and attenuates the input signal depending on the level of the first control signal; a...
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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...
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5521983 |
Speaker system for use in high background noise environments
A speaker system for use in a high background noise environments is disclosed. The system receives an input electrical signal and produces an output sound signal predominantly within a...
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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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5509080 |
Bass clipping circuit
A clipping circuit is coupled across the bass feedback shunt capacitor in an amplifier circuit to effectively reduce only high level bass signals while allowing level high frequencies to pass and...
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5502768 |
Reverberator
Disclosed is a reverberator that comprises: distorted signal generating means for outputting a distorted signal obtained by distorting an input tone signal; predetermined frequency band signal...
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5493617 |
Frequency bandwidth dependent exponential release for dynamic filter
In a dynamic noise reduction system, the release time versus frequency bandwidth is exponentially related and well beyond that achievable with a simple RC circuit. A dc control signal is derived...
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5481617 |
Loudspeaker arrangement with frequency dependent amplitude regulation
A known technique to improve bass reproduction in loudspeakers is by boosting amplitude at low frequencies, but this can lead to an overload at high signal level. This can be prevented if the level...
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5467400 |
Solid state audio amplifier emulating a tube audio amplifier
A solid state audio amplifier for connection with a loudspeaker cabinet or emulation thereof to provide amplification characteristics emulating in frequency response those of a valve audio...
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5438625 |
Arrangement to correct the linear and nonlinear transfer behavior or electro-acoustical transducers
This invention regards an arrangement to correct the linear and nonlinear transfer behavior of electro-acoustical transducers, consisting of an electro-acoustical transducer, a distortion-reduction...
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5434923 |
Acoustic apparatus
In an acoustic reproduction system, an audio signal obtained from a source is ornamented by a sound processing pattern such as reflecting and reverberating sounds and then the sound processed audio...
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5418859 |
Correcting apparatus of sound signal distortion by way of audio frequency band segmentation
The present invention relates to a correcting apparatus of sound signal distortion by way of an audio frequency pass segmentation, the apparatus comprising: frequency band segmentation means for...
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5416847 |
Multi-band, digital audio noise filter
This disclosure provides a multi-band, digital audio noise filter that is especially useful in the restoration of motion picture film soundtracks. More particularly, the preferred embodiment...
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5412733 |
Acoustic reproducing apparatus
The present invention relates to an acoustic reproducing apparatus which is suitable particularly for listening to reproduced sound with noise through an open-air-type head phone. A sound leakage...
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