Matches 201 - 250 out of 266 < 1 2 3 4 5 6 >
Match Document Document Title
4641361 Multi-band automatic gain control apparatus  
A multiple band automatic gain control circuit having a band splitter which is responsive to an input audio signal for separating the audio signal into plural components of different frequencies....
4633501 Program dependent crossover filter (PDC)  
An audio crossover filter which automatically tunes the crossover frequency according to the content of the program audio which is being filtered.
4631749 ROM compensated microphone  
A microphone is provided with a read only memory (ROM) which is programmed to compensate for the microphone's nonlinear frequency response characteristic during their integration into a single...
4628530 Automatic equalizing system with DFT and FFT  
The equalizing arrangement in accordance with the invention comprises an equalizing unit (4) for correcting the frequency characteristic of an electric signal applied to its first input (7) under...
4622691 Mobile sound field correcting device  
A mobile sound field correcting system for correcting an acoustic characteristic in a vehicle sound field formed by direct waves radiated from loudspeakers and reflected waves thereof providing...
4612665 Graphic equalizer with spectrum analyzer and system thereof  
A graphic equalizer comprises an equalizer for separately level adjusting the input signal for each of a number of divided frequency bands which are different from each other, control knobs...
4611343 Audio spectrum analyzer operable in a difference mode  
A real-time, microprocessor-controlled, 1/2-octave audio spectrum analyzer is capable of operating in a difference mode wherein a current input may be compared with a previously stored input and...
4610024 Audio apparatus  
An audio apparatus includes a signal generating circuit for generating a first electrical audio frequency signal corresponding to audio information received from a source, such as a phonograph...
4606071 Loudspeaker system utilizing an equalizer circuit  
A loudspeaker system includes a low-frequency driver and a high-frequency driver which are connected to a crossover network. The crossover network includes an inductor in series with the...
4593405 Loudspeaker system with combination crossover and equalizer  
A crossover network with a parallel resonant circuit in the high frequency branch is utilized to drive two loudspeakers, one in a low frequency range, and the other in the high frequency range. The...
4566119 Equalizer networks and methods of developing scaling coefficients therefor  
An adjustable equalizer network comprises a series chain of N all pass amplifier stages driving M minimum phase shift transversal filters connected to a final summing circuit that includes means to...
4549289 Method for correcting acoustic distortion  
A method and apparatus useful in both the recording and playback of audio recordings for correcting the effects of acoustic distortion introduced by the room in which the recording is made and/or...
4504968 Equalizer apparatus having two dimensional display  
In a presettable graphic equalizer for use in a car stereo or the like, a display device capable of two-dimensional display is disposed, whereby a frequency characteristic presently given to audio...
4501015 Apparatus for electroacoustic energy conversion  
The present invention relates to apparatus for electroacoustic energy conversion and particularly to a conversion apparatus comprising a channel for an electrical signal to be converted, said...
4495640 Adjustable distortion guitar amplifier  
A programmable adjustable distortion amplifier circuit has a first channel having an adjustable gain and a filter for filtering high and low frequency components of signal processed by the first...
4490692 Reverse equalization network  
An equalization network is disclosed combining negative slope equalization with low pass filtering and low frequency compensation. The network is for use on electrical lines transmitting electrical...
4490839 Method and arrangement for sound analysis  
For sound analysis, especially for speaker identification, a long-term spectrum is often formed from the recorded signal and compared to a long-term spectrum of a previously recorded signal. When...
4489442 Sound actuated microphone system  
A microphone channel is constructed from a pair of unidirectional microphone elements mounted back-to-back for monitoring sound coming from a predetermined area of space. The output signals of each...
4483015 Compensation network for loudspeakers  
Passive frequency compensation networks are disclosed which extend and smooth the base response of loudspeakers. The compensation networks include a series resonant circuit including a resistor,...
4481662 Method and apparatus for operating a loudspeaker below resonant frequency  
A method for processing the audio signal in a loudspeaker system prior to delivery to the loudspeaker and the apparatus for such processing is disclosed. Uniform acoustic output with respect to...
RE31679 Loudspeaker enclosure with acoustical compliance resonating with port mass at frequency below system resonance  
A multiple driver loudspeaker system comprises two angularly spaced rear rectangular baffles each nearly filled with four closely spaced full-range small loudspeakers with a port tube passing...
4461931 Frequency response equalizing network for an electrostatic loudspeaker  
An electrostatic loudspeaker system includes a transformer whose secondary winding is connected to the conductive plates of an electrostatic loudspeaker and whose primary winding is energized by an...
4458362 Automatic time domain equalization of audio signals  
This disclosure concerns an equalizer for an audio reproduction system in which equalization is achieved using a discrete time filter. The filter is preferably implemented with a microprocessor...
4405836 Signal equalization selector  
A combination radio and tape player is disclosed which includes a signal equalization selector wherein the audio program selection switches which select either an AM or FM radio mode or a tape...
4396806 Hearing aid amplifier  
A general purpose hearing aid amplifier is programmably adaptable to the prescription requirements of the hearing impaired. The hearing aid amplifier comprises a bank of bandpass-restricted...
4359601 Audio control system  
An audio control system comprised of an equalizer which divides and controls the level of a plurality of audio frequency bands and an electronic display which provides an illuminated indication of...
4354160 Amplitude equalizer  
An amplitude equalizer, suitable for use on telephone lines, is disclosed. The circuit includes an adjustable-gain amplifier, and an adjustable-slope equalizer section. A mixer section serves to...
4340780 Self-correcting audio equalizer  
A self-correcting audio equalizer is disclosed for use in a high fidelity sound reproduction system. The equalizer (46) responds to the audio signal to provide an equalized audio signal to a sound...
4327250 Dynamic speaker equalizer  
A dynamic equalizer circuit is disclosed for the driver system of an electro-mechanical transducer such as a loudspeaker. The circuit provides an improved or leveled audio output and includes a...
4186274 Sound system control  
Control panel arrangement for an audio equalizer features grouped horizontal and vertical slider controls for convenience in adjusting channel gain, bandwidth and frequency response.
4178473 Two-way loudspeaker for vehicle  
A combination speaker assembly including an annular housing having a peripheral wall with an opening therein and having first and second open ends, a first speaker for reproducing audio mid...
4177356 Signal enhancement system  
An improved expanding system is described for enhancing transmitted or recorded audio signals previously processed by anyone of several nonlinear amplifying techniques. The system is designed to...
4146745 Loudspeaker enclosure with multiple acoustically isolated drivers and a common port  
A multiple driver loudspeaker system comprises two angularly spaced rear rectangular baffles each nearly filled with four closely spaced full-range small loudspeakers with a port tube passing...
4130727 Loudspeaker equalization  
Variations in the amplitude-frequency response characteristic of a loudspeaker are compensated by a drive circuit in which an audio input signal is summed with a delayed signal derived from the...
4130726 Loudspeaker system equalization  
Variations in the amplitude-frequency response characteristic of a loudspeaker are compensated by a drive circuit in which an audio input signal is summed with a plurality of delayed replicas of...
4118601 System and a method for equalizing an audio sound transducer system  
A system and a method of electronically equalizing the composite transfer function of a sound system and a room which receives the sound generated by the sound system. A test signal, such as white...
4109107 Method and apparatus for frequency compensation of electro-acoustical transducer and its environment  
The anechoic audio response of a speaker is measured over a frequency range; and the composite anechoic audio response is separated into three distinct characteristic curves, namely (1) the...
RE29529 Equalization circuit  
A frequency equalization circuit includes an active filter circuit. The filter circuit differentiates the input signal. A plurality of adjustable resistances are connected to the differentiator...
4046960 Audio fidelity frequency equalizer system  
An audio fidelity frequency equalizer system for use with audio fidelity sound equipment in order to frequency contour sound reproduction to obtain a desired listening environment. The frequency...
4042779 Coincident microphone simulation covering three dimensional space and yielding various directional outputs  
A microphone assembly for simulating a plurality of coincident microphones has at least four microphone units mutually disposed at the integration points of an integration rule for the surface of a...
4021614 Woofer equalizer  
A speaker system is disclosed which comprises a woofer, a transformer secondary and a plurality of inductive and capacitive impedances. Switching means are provided for coupling selected taps of...
3949325 Audio equalizers for large rooms  
In known audio equalization systems, full room equalization cannot be employed because it introduces undesirable transient effects during the growth stage of a sound field, especially in a large...
3921104 Adjustable equalizers useable in audio spectrum  
In an equalizer using multiple, parallel-connected band-pass filters, the filters are removed from the signal path and connected to tap off inputs from the signal path and feed back outputs to...
3914549 Electrical audio signal processing  
An electronic loudspeaker equalizer network is coupled to the tape monitor jacks of a receiver, preamplifier-amplifier or preamplifier. When the receiver, preamplifier-amplifier or preamplifier has...
3862366 SOUND RADIATION SYSTEM  
A sound radiator comprising at least four high frequency loudspeakers with their axes intersecting in zigzag relationship, and a single low frequency loudspeaker whose center is at a distance not...
3855423 NOISE SPECTRUM EQUALIZER  
Apparatus for noise spectrum equalization of applied spectrum samples to enhance detection of periodic signals embedded in noise. Equalization is achieved with apparatus which repetitively searches...
3818138 BARREL SHAPED SPEAKER ENCLOSURE  
Speaker enclosure having a general barrel-shaped profile containing a plurality of loudspeakers. Two embodiments are shown, one of which utilizes a plurality of full range loudspeakers, the second...
3803359 EQUALIZATION SYSTEM FOR POWER AMPLIFIER AND LOUDSPEAKER SYSTEM  
A loudspeaker system which includes a loudspeaker and a drive, the loudspeaker being in an enclosure having a Q of 0.5 or less at a frequency well within the audio band, resulting in rapid rolloff...
3798374 SOUND REPRODUCING SYSTEM UTILIZING MOTIONAL FEEDBACK  
A sound reproducing system utilizes motional feedback to reduce loudspeaker distortion and to extend the loudspeaker's frequency response. The system substantially comprises an amplifier which is...
3755749 SOUND REENFORCEMENT EQUALIZATION SYSTEM  
An active filter in combination with a sound reenforcement equalization system is provided. The filter permits variation of the notch frequency over a wide range of frequencies and adjustment of...
Matches 201 - 250 out of 266 < 1 2 3 4 5 6 >