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JP3247278B2 |
To provide a noise matching device capable of adding the noise of more natural acoustic feeling. Noise n (n) generated by a noise generating means 8 is added to a transmitted signal y (n) whose level is reduced. The device is provided wi...
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JP2002501206A |
The signal echo monitoring device includes a transmitting unit (5) for broadcasting a transmitted signal (s(t)) which is a group of randomly generated pulses, a receiving unit (6) for receiving an echo signal (e(t)), reflected by an obje...
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JP2002009674A |
To provide a tap coefficient training method and circuit, that can obtain tap coefficient with optimum stability, in which the occurrence of divergence or non-convergence of the tap coefficient will not occur, with respect to a character...
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JP3244722B2 |
PURPOSE: To omit troublesome processing in a conventional device that a point of agreement is obtained with respect to a bit error rate through simulation and a sampling phase is identified. CONSTITUTION: A likelihood or a square sum of ...
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JP3244416B2 |
To provide the canceller which can be adapted to an echo route having an arbitrary delay of a telephone line and is stably operated by switching, which requires a small operation volume and is less affected by a break of the head of spee...
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JP3244522B2 |
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JP3241739B2 |
A method and apparatus for adaptively despreading a direct sequence spread spectrum signal. The direct sequence spread spectrum signal is provided to a transversal filter. The output of the filter is demodulated to provide a soft symbol....
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JP3241328B2 |
To accurately specify an initial delay quantity variable with environment, etc., and to reduce a calculation quantity and a memory. This echo canceler for canceling echoes by using adaptive algorithm is provided with an adaptive filter p...
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JP2001352277A |
To provide a method and apparatus for adaptively inversely spreading a direct/sequence spread spectrum signal.A direct/sequence spread spectrum signal is given to a transversal filter 101. An output of the filter 101 is inversely spread ...
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JP2001352230A |
To provide an FIR filter which can prevent break of equal ripple of weighted approximation error and maintain the gain in a pass band to be an almost constant value, and a method for setting coefficients of the filter.This method for set...
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JP3239926B2 |
PURPOSE: To perform the distortion compensation control with a high precision by forming a feedback loop to adjust the extent of phase shift and the amplitude of pseudo distortion. CONSTITUTION: A reception signal is divided to two syste...
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JP3238542B2 |
PURPOSE: To provide an automatic equalizer capable of converging equalization characteristics to optimum characteristics at all times even when the waveform distortion of input signals becomes large. CONSTITUTION: This automatic equalize...
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JP3236226B2 |
To reduce the arithmetic operation volume at initial stage of convergence by providing an adaptive filter part to generate a false echo signal, an inner state updating part, a block size control part to sequentially output to the adaptiv...
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JP3233926B2 |
PCT No. PCT/EP90/00873 Sec. 371 Date Jan. 27, 1992 Sec. 102(e) Date Jan. 27, 1992 PCT Filed Jun. 1, 1990 PCT Pub. No. WO90/15495 PCT Pub. Date Dec. 13, 1990.In order to equalize digitally coded signals, predetermined test sequences are t...
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JP3235668B2 |
PURPOSE: To provide a digital transmission system with various levels of transmission quality by increasing or decreasing the complication of a circuit on the transmitter side or the receiver side. CONSTITUTION: The digital transmission ...
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JP3234811B2 |
To reduce the cost of an entire communication system by eliminating an acoustic echo canceller which is provided on a remote side communication device and installing a single acoustic echo canceller in a proximate side communication devi...
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JP2001523925A |
An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive non-linear echo path response detection. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients ...
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JP2001523924A |
An echo canceller circuit for use in an echo canceller system is set forth. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients to simulate an echo response occurring during a call. A second d...
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JP2001523926A |
An echo canceller circuit for use in an echo canceller system is set forth. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients to simulate an echo response occurring during a call. A second d...
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JP3231405B2 |
PURPOSE: To automatically perform waveform equalization according to signal quality by finding an equalization error from a delay signal, a difference signal, and a ternary decision signal generated from an output signal, and feeding it ...
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JP3231406B2 |
PURPOSE: To automatically perform easy and highly precise waveform equalization according to a difference in signal quality by finding an equalization error quantity from a delay signal, a composite signal, and a ternary signal generated...
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JP3230482B2 |
To provide an adaptive equalizer to optimize an update amount control parameter μ which controls the degree of update size with regard to changes in a communication path and can reduce deterioration of BER characteristics. BER estimatio...
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JP3230662B2 |
To provide a multi channels echo canceler with a simplified hardware that can efficiently perform echo processings of many channels. An estimation processing circuit 300 has an adaptive finite impulse response(FIR) filter 310 to selectiv...
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JP2001320308A |
To actually realize an adaptive equalizing device as hardware, even when the length of delay time and the number of modulation multivalues to be object of compensation are large.A training part 102 calculates a tap coefficient, an impuls...
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JP2001319421A |
To use an adaptive equalizing circuit for a reproducing device without tracking control.A reproducing signal to be supplied to an input terminal 20 is supplied to plural unit delay means 21-24 connected in series, and input and output en...
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JP2001313594A |
To provide a coefficient updating method for a time domain equalizer for a DMT(Discrete Multitone Modulation) system by which an optimum coefficient can be obtained even for a data period and a processing amount of coefficient updating c...
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JP3225644B2 |
PURPOSE: To prevent the occurrence of hunting phenomenon based upon a limit cycle by detecting that an input signal becomes a DC value (including '0') and setting up a value fed back to a quantizer to '0'. CONSTITUTION: An input signal f...
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JP3224835B2 |
An adaptive balance filter in which the coefficients of an adaptive filter (BF) are only transferred into a shadow filter (FF) when a digital input signal (DI) to be transmitted is recognised as a broadband signal.
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JP2001520821A |
A dual-processing interference cancelling system and method for processing a broadband input in a computationally efficient manner. Dual processing divides the input into higher and lower frequency bands and applies adaptive filter proce...
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JP3222646B2 |
PURPOSE: To reduce the manufacture cost by providing a means allowing a learning signal generating means to generate a specific signal so as to reduce the circuit scale. CONSTITUTION: Signals whose frequencies are f0+f1 and f0-f1 appear ...
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JP3224496B2 |
To attain equalization processing minimizing a residual error in the case of presence of a noise which properly traces even a fast fluctuation in a channel. The data receiver having a demodulator 4 with an adaptive control device and a t...
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JP2001295622A |
To provide an active type muffler without time restrictions with regard to adaptive estimate operation. From a duct coefficient sequence FRF1, obtained by correcting sound transmission characteristics FRFA from a noise detecting micropho...
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JP2001519578A |
A new signal processing method and a signal processing engine which can achieve extremely fast responsiveness to instantaneous changes in the behavior of the signal, and maintain the accuracy of standard harmonic methods. The signal proc...
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JP3221173B2 |
PURPOSE: To provide the equalizer for digital mobile communication equipment capable of correcting the phase of each reception signal to the reference phase even when the change amount of the phase rotation of a received signal differs r...
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JP3221076B2 |
PURPOSE: To reduce the number of program commands when an arithmetic amount is reduced by software and to decrease the circuitry when reduced by hardware in a real-time digital signal processing in such as picture, voice, acoustic signal...
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JP3218441B2 |
PURPOSE: To suppress noise by obtaining a minimum square recursive curve based on data stored in an observation data storage means and outputting estimate observation data obtained thereby and estimate observation data for high-order dif...
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JP2001285998A |
To provide a device generally usable by unspecified many listeners without the need of complicated constitution. An earphone 3 is mounted on the ear of the listener and a microphone 4 gathers sound waves generated from the earphone 3 ins...
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JP3216704B2 |
To reduce the noise caused by breathing and to speedingly follow up the movement of an interference signal source while maintaining the quality of the output signals high. In a beam former 2, the sensitivity against an object signal sour...
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JP3216094B2 |
The system according to the invention for detecting data spectrum distortion in transmission, in particular the distortion caused by selective fading, is based on identifying in-band dispersion, i.e an amplitude distortion and for this a...
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JP2001517884A |
Method for separating at least two signals from a mixture of signals, in which method the number of different mixtures is at least as great as the number of signals to be separated, the method comprising a modified criterion based on a c...
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JP3215788B2 |
To reduce the required operation volume and the required memory capacity to make the device small-sized, low-cost, and low-power consumption in the case that the 2100Hz phase inverted answer tone of a wired modem of V25 series or the lik...
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JP2001275182A |
To surely suppress howling in a loudspeaking system in a simple configuration. A delay unit 2 and an adaptive filter 3 delay a microphone input signal y(n) to generate a sine component b(n)=sin(ω0*t+θ'+θ") delayed from the howling com...
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JP2001517391A |
A method and arrangement for forming an address for use in signal predistortion. The arrangement is used to form a corrector table address employed in the signal predistortion to compensate for signal distortions. The signal distortions ...
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JP3213753B2 |
An echo canceler (10) is controlled and operated during hangover time between a double talk condition and a single talk condition for a more natural residual echo cancellation. The adaptive gain and the residual suppression threshold nec...
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JP3211884B2 |
To provide the sound echo canceler which has excellent echo elimination performance and a small arithmetic quantity. A subtracter 102 substrates a dummy echo signal from a microphone input signal and outputs a residual echo signal. An ad...
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JP3211104B2 |
PURPOSE: To provide the signal processing unit in which noise elimination in a noise filter circuit is less malfunctioned and high speed processing is executed. CONSTITUTION: Raw data (analog signal) are inputted to a multi-stage compara...
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JP2001257565A |
To provide a method and device for updating the reflection coefficient which can be used for reducing the number of division calculations required for updating the reflection coefficient of a lattice type filter and for allowing the latt...
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JP3210494B2 |
PURPOSE: To provide an adaptive filter system to converge noise or feedback suppressing capability over a selected frequency band. CONSTITUTION: The noise/feedback suppressing device processes an input audio signal 120 having both a pref...
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JP2001251167A |
To provide an adaptive filter which insures stable convergence even to extreme fluctuation of a path having a plurality of responding parts defined as estimation objects and to a signal having relatively strong autocorrelation and intens...
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JP2001244793A |
To provide a notch filter that eliminates unwanted line spectrum components from a broadband signal, on which the undesired line spectrum component is superimposed, easily adjusts the frequency of the eliminated line spectrum and suppres...
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