Matches 151 - 200 out of 311 < 1 2 3 4 5 6 7 >
Match Document Document Title
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...
5406636 Signal processing device  
An audio electronic volume controller (100; consisting of a ladder resistance and a CMOS switch group) and an output buffer (B2) are formed within an identical semiconductor substrate 10S, and...
5404315 Automatic sound gain control device and a sound recording/reproducing device including arithmetic processor conducting a non-linear conversion  
A sound gain control device for automatically controlling a gain by which an output signal from a sound CODEC is multiplied is provided. Sound signals from a sound input device are processed by a...
5402498 Automatic intelligent audio-tracking response circuit  
A circuit automatically adjusts in response to an input audio signal to provide a dc control signal having the release characteristics of the input audio signal. The circuit has an input reference...
5396551 Headset amplifier  
A headset amplifier, adapted for use with a voltage source such as a battery, includes a time-out-timer circuit for deactivating the headset amplifier after a first predetermined period of time and...
5394474 Echo attaching circuit and audio device using the same  
This invention includes a compression circuit for compress one of an audio signal and a mixture of the audio signal and an echo signal, a delay circuit for delaying an output signal of the...
5394475 Method for shifting the frequency of signals  
Method and device for transposing the frequency of an input signal, in particular for hearing aids, comprising: an analytical circuit (AS) with which are produceable a momentary frequency signal...
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...
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...
5361381 Dynamic equalizing of powered loudspeaker systems  
A powered loudspeaker system has a cabinet. The cabinet has at least one electroacoustical transducer and a power amplifier coupled to the electroacoustical transducer. Dynamic equalization...
5359665 Audio bass frequency enhancement  
A device for enhancing the bass frequency components in an audio signal while avoiding overload problems associated with fixed levels of bass frequency enhancement. The device divides the input...
5317640 Switched amplifier  
In a hearing aid having a switched amplifier, an amplifier circuit is provided so that the pulse amplitude of the switched output signal is adjusted as a function of the envelope of the audio...
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...
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...
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...
5289529 Means for improving the dynamic range of an analog/digital converter in a digital telephone answering machine  
An automatic gain controller uses a voltage controlled amplifier coupled to an averaging circuit that feeds back into the amplifier. The averaging circuit supplies a controlling voltage that keeps...
5276764 Method and device for compressing and expanding an analog signal  
A device and a method for processing an analog input signal (S) which varies widely in amplitude, such as speech, for the purpose of reducing the ratio of maximum to minimum amplitude variations of...
5263091 Intelligent automatic threshold circuit  
A circuit for conditioning an input signal containing audio and noise components is provided in which a first circuit branch is used for deriving a first DC signal proportionate to the decibel...
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...
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...
5204909 Audio processing system using delayed audio  
An audio processing method is described wherein an audio input signal is delayed and then submitted for signal processing. The signal is sampled prior to the delay and control parameters for speech...
5201009 Signal processor  
An operational amplifier (1) and resistors (11) and (12) damp an input signal (V 1 ) by -6dB. Since a positive input terminal of the operational amplifier (1) is fixed at -3V, DC component of the...
5199078 Method and apparatus of data reduction for digital audio signals and of approximated recovery of the digital audio signals from reduced data  
For facilitating the transmission or recording of digital audio signals in a narrow band channel or at a reduced data rate without deterioration of audio quality detectable by the human ear, a...
5185806 Audio compressor, expander, and noise reduction circuits for consumer and semi-professional use  
Three related embodiments of audio signal dynamic range circuits for consumer and semi-professional audio signal compressors, expanders, and compressor/expander noise reduction systems incorporate...
5170437 Audio signal energy level detection method and apparatus  
An audio signal energy level detector for use with audio signal processing is described. The energy level detector includes a high-pass filter series-connected between an audio input signal and a...
5168526 Distortion-cancellation circuit for audio peak limiting  
Apparatus for reducing distortion in a peak limited audio siganl. The amount of low-frequency spectral energy in the input audio signal is determined for a peak limited signal and used to control...
5165017 Automatic gain control circuit in a feed forward configuration  
An input signal representing speech is preamplified, filtered, and fed foward in parallel to Automatic Gain Control (AGC) circuitry and to a gain controllable amplifier. The AGC detects the peak...
5131046 High fidelity hearing aid amplifier  
A high fidelity hearing aid amplifier is operable at a very low battery voltage and includes a single integrated circuit chip which provides a variable gain amplifier and gain control circuitry...
5124657 Composite signal processor and single-ended noise reduction system  
A composite signal processor and single-ended noise reduction system uses a split input to the single-ended noise reduction circuit in such a manner that the audio signal from the output of the...
5124668 System for creating distortion in electric musical instruments  
A system is provided for use with an electrical musical instrument for conditioning electrical signals generated by the instrument and for creating controlled distortion. The system includes an...
5115471 High frequency expander device  
An audio signal compression device which utilizes both a broad band compressor and a high frequency expander. The level of the compression provided by the compressor and the level of expansion...
5095539 System and method of control tone amplitude modulation in a linked compression-expansion (Lincomplex) system  
A linked compressor-expander (Lincompex) system and method varies the power of the control tone signal to maintain the power of the signal supplied to the transmitter substantially constant. The...
5070527 Time dependant, variable amplitude threshold output circuit for frequency variant and frequency invarient signal discrimination  
An audio compression system wherein the compression theshold may be adjusted to a calibrated level. The audio compression system is utilizable in a receiver system whereinan audio input signal...
5065451 System and method of frequency calibration in a linked compression-expansion (lincompex) system  
A linked compressor-expander (Lincompex) circuit for use in telecommunications utilizes a frequency compensation circuit to frequency shift the total bandwidth of the whole communication channel to...
5050217 Dynamic noise reduction and spectral restoration system  
An audio processor consisting of a "single-ended" dynamic noise reduction system cascaded and cross-coupled with a program-adaptive dynamic equalizer. The audio at the output has a consistent...
5046129 Reducing phase error in received FM multiplex signal  
A receiver for receiving a transmitted signal comprising first and second bandwidth limited component signals modulating a single high frequency carrier in phase quadrature with the first component...
5010410 Method and apparatus for signal companding  
A method and apparatus for signal companding is disclosed that incorporates a log-offset companding technique to provide both a high bandwidth over the dynamic range of the signal being processed...
5008634 System for controlling the dynamic range of electric musical instruments  
A system is provided for use with an electrical musical instrument for conditioning electrical signals generated by the instrument. The system includes an amplifier circuit having an input for...
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...
4977590 Signal level expansion apparatus as for a telecommunications system  
A signal level expansion system for use in a telephone device is described which includes a level expansion circuit and an optional microphone enclosure. The circuit includes a voltage divider...
4972164 Amplitude compressing/expanding circuit  
In an amplitude expanding/compressing circuit for expanding, compressing, or expanding and compressing an amplitude of an input signal, the following are provided: a control signal generator...
4947133 Method and apparatus for automatic signal level adustment  
An input signal passes by way of a variable gain amplifier to an output terminal. In addition the input signal is applied to a peak detector and then a control signal is derived by applying a...
4944015 Audio compression circuit for television audio signals  
An audio compression circuit for limiting an audio television signal in a linear fashion at a pre-established maximum level is disclosed. The circuit includes a series resistance circuit for...
4940947 Line noise signal measurement system using analog signal compression with digital linearity correction  
A line noise signal measurement system is provided with detecting circuitry for providing a sensed analog signal. Compression circuitry is coupled to the detecting circuitry for providing an...
4922535 Transient control aspects of circuit arrangements for altering the dynamic range of audio signals  
In circuits for generating rapidly changing, yet smooth and controlled, control signals in response to transient signals for use in audio compressors and expanders, a steady-state portion of the...
4916741 FM/FMX stereophonic receiver  
An FMX stereophonic receiver for receiving an FMX stereophonic broadcast signal, which includes a stereo sum signal, a stereo difference signal and a compressed stereo difference signal, is...
4905291 Cyberoptic audio level control system  
The specification discloses an audio signal level control system including a center-tapped photocell incorporated into an attenuator bridge. The cell elements are monitored while processing the...
4893099 Extended response dynamic noise reduction system  
A noise reduction system compresses an input signal at a constant ratio in response to a control signal derived from the compressed signal. Added to the derived control signal is a counterfeit...
4891837 Voice control circuit for a communication terminal  
A voice control circuit controls the volume range of the voice signals in a communication terminal, such as a video telephone having a hands-free facility. In a hands-free facility, the...
4887299 Adaptive, programmable signal processing hearing aid  
A hearing aid system utilizing digital signal processing is programmable to fit the hearing deficit of a particular use and adaptive to the sound environment to maximize the intelligibility of the...
Matches 151 - 200 out of 311 < 1 2 3 4 5 6 7 >