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JP3338282B2 |
To provide a high speed MODEM in a telephone local loop by overlapping a timing signal on a pulse signal transmitted from a PSTN to a reception QLS MODEM. User data 229 are transmitted as a pulse signal through a transmission QLS MODEM 2...
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JP3339612B2 |
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JP3334063B2 |
PURPOSE: To obtain a frequency offset estimation device which copes with a frequency offset and in which the error rate is improved. CONSTITUTION: A control section 12 in the frequency offset estimation device adds plural frequency offse...
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JP3335073B2 |
Acoustic echos are canceled by employing a first echo canceler having a comparatively long first impulse response synthesis capability which is connected between a transmit path and receive path for generating a first error signal and fo...
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JP2002533970A |
(57) [Summary] Stable adaptive filters and methods thereof are disclosed. The present invention solves the problem of instability associated with fast affine projective adaptive filters caused by error accumulation in the inverse matrix ...
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JP3331831B2 |
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JP3329519B2 |
PURPOSE: To provide a hearing sense aid device with which feedback can be effectively removed. CONSTITUTION: An input filter is provided with a user operable adaptive filter 34 for applying the quick adaptation of filtering characteristi...
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JP2002280936A |
To provide a method for detecting faults in an automatic equalizer, that monitors a shift in a center tap factor Cn and identification errors in a control section of the automatic equalizer, so as to detect a fault state which could not ...
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JP2002271175A |
To obtain a unit for updating the coefficient of an adaptive filter, a program for implementing it and a recording medium stored with that program, in which a variety of systems can be responded flexibly and at a high rate.For an observa...
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JP2002530922A |
A method of processing signals received from an array of sensors includes sampling and digitally converting the received signals. The digitally converted signals are processed to provide an output signal, the processing including filteri...
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JP3325735B2 |
A data signal composed of a desired signal faded and delayed and an interference signal faded and delayed is received by a pair of antennas. A direct component of the interference signal and a delay component of the desired signal are re...
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JP3321976B2 |
A transfer process in which, an original vector signal is precoded to an intermediately-precoded vector signal, and the extended modulo operation is performed when the intermediately-precoded vector signal is located outside a predetermi...
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JP3322593B2 |
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JP3321836B2 |
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JP3320542B2 |
A method of filtering digital signals having high dynamic ranges comprises the steps of: sampling the input signal (S1) through at least two different filtering modes or operations; and reconstituting the output signal (S2) by summing to...
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JP3320075B2 |
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JP2002528778A |
(57) [Summary] The method for determining the parameters of the technical system is determined. By this method, the output signals are obtained from a statistically independent set of input signals superimposed on each other. Parameters ...
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JP3319403B2 |
To obtain a method and a device for removing a multi-channel echo, by which the coefficient value of an adaptive filter is converged to a correct value which is uniquely fixed by means of the impulse response of an echo pass, sound quali...
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JP2002246880A |
To shorten an arithmetic processing time in a conventional adaptive filter by performing a convolution arithmetic operation and a norm arithmetic operation in the same arithmetic loop.A reference signal Xj is inputted to the delay line o...
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JP3318243B2 |
To reduce an erroneous synchronization when a synchronization point is deviated backward from a true synchronization point due to fading in the frame synchronization circuit where the correlation between orthogonal detection data and a u...
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JP2002526961A |
(57) [Summary] An improved way to adaptively eliminate the acoustic feedback of hearing aids and other sound amplifiers. Feedback elimination is limited to a frequency band that includes all unstable frequencies. By limiting the bandwidt...
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JP3316594B2 |
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JP3316259B2 |
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JP2002230902A |
To use an adaptive equalizer circuit for a reproducing device without tracking control.A reproduced signal is supplied to an analog/digital converter 6 and a phase lock loop means 7 and digitally converted. Characteristic information suc...
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JP3313834B2 |
PURPOSE: To execute the same operation as a hearing sense aid device for filtering a selected audio component depending on user operation in proper state. CONSTITUTION: In a hearing sense aid device 1 adapted so as to receive surrounding...
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JP3310664B2 |
A data communication system, comprising a first and a second transceiver coupled together through a transmission channel, the transmission channel having transmission characteristics. A measurement circuit is coupled to the first transce...
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JP3308243B2 |
To enhance the accuracy of D/A conversion and A/D conversion. A switch circuit conducts a selective operation that includes an action of discharging or charging selectively at least either of 1st and 2nd capacitors and an action of selec...
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JP3308055B2 |
PURPOSE: To make the curves of boost characteristics and cut characteristics vertically symmetrical by adding an input signal at the time of boosting or an output signal at the time of cutting to the input signal after passing it through...
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JP3307923B2 |
An electronic filter for filtering an electrical signal. Signal processing circuitry therein includes a logarithmic filter (81) having a series of filter stages with inputs and outputs in cascade and respective circuits associated with t...
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JP3309348B2 |
PURPOSE: To perform frequency setting in delicate fashion and to recognize frequency characteristic at a glance. CONSTITUTION: A CPU 32 displays a display indicator 44 of slide volume shape on a display part 38. The display indicator 44 ...
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JP3309008B2 |
PURPOSE: To perform an auto equalizing by determining the frequency characteristic of an equalizer so as to be a desired overall frequency characteristic even if white noise is not generated. CONSTITUTION: A microphone 14c detects sound ...
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JP3308780B2 |
To attain signal conversion such as an excellent voice signal by generating a signal to cancel noise, summing signals so as to cancel the noise thereby suppressing the noise in the converted output and reducing considerably intrusion of ...
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JP3305719B2 |
This invention relates to an improved method of on-line system identification for use with active control systems which requires less computation and reduces the problem of coefficient jitter in the filters of the active control system b...
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JP3306736B2 |
PURPOSE: To allow a frequency offset compensation circuit compensating automatically a frequency error between transmission and reception of a digital signal to attain frequency offset compensation for an MLSE equalizer with high accurac...
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JP3306600B2 |
PURPOSE: To obtain an automatic sound volume control device in which the effect of a speaker sound is excluded from a microphone detection signal and the output sound volume of the speader is controled in response to the level of only su...
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JP2002522970A |
Methods and apparatus for echo and noise cancelation contemplate occasional saturation of an echo and/or noise containing source signal and control adaptation of a cancelation filter to minimize the detrimental effects of such source sig...
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JP3303898B2 |
PURPOSE: To attain the reduction of an arithmetic amt. by calculating a pre-filter coefficient vector with specific regression equations with respect to the pre-filter coefficient vector. CONSTITUTION: The estimated transfer function cor...
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JP3304035B2 |
To configure a maximum ratio synthesis circuit or a selection synthesis circuit through the use of a maximum likelihood series estimate type equalizer by providing a signal to noise ratio estimate means corresponding to a branch and a we...
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JP3303036B2 |
In a multi-channel receiver system embodying the invention, a "trained" receiver channel which is active and propagating data signals may be used to train any other receiver channel. Each receiver channel of the system has an input and a...
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JP3301287B2 |
To stably operate a Cartesian feedback even when an amplifier having the characteristic whose phase characteristic is remarkably changed by an amplitude value is used and to improve a distortion improvement factor. A modulation input - p...
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JP3299253B1 |
A family of multiple scale adaptive filters and filtering methods that automatically adapt their impulse response width to local data characteristics, optimizing the accuracy, yield, and/or detail of interferometric measurements. A prefi...
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JP3300087B2 |
PURPOSE: To remove limit defects of an application area by providing a filter and a control units for sampling an input and a reference signals at an improved sampling rate, and another filter unit which operates at a prescribed rate. CO...
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JP2002190756A |
To receive a signal sample at a first rate but carry out equalizing operation at a second rate lower than a signaling rate.An equalizer receives a sample by a shift register at the first rate. A selected sample from the shift register is...
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JP2002189476A |
To provide an active noise removal method using an independent component analysis which makes it possible to obtain noise removal performance more improved than the conventional LMS adaptive algorithm.Learning is carried out in such a ma...
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JP3298648B2 |
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JP3298240B2 |
PURPOSE: To perform a wave equalization with high precision and at high speed by providing plural sample and hold circuits in the post-stage of the input terminal of a data signal, by making the circuit perform sampling operations one by...
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JP3297814B2 |
PURPOSE: To prevent a desired voice from being reduced and reduces only an object unnecessary sound in an adaptive noise reduction type voice input device. CONSTITUTION: A microphone 21 for reference input which generates output signals ...
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JP3296330B2 |
To provide a tap weight control method which speeds up the convergence of the adaptive filter using the sine-sine algorithm. The adaptive filter has an acrylic filter, obtains a correlation value 13 by multiplying the sum 12 of an error ...
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JP3293922B2 |
PURPOSE: To identify the function of transmission between a control sound source and a residual noise detecting means with high accuracy by increasing an arithmetic variable a little. CONSTITUTION: A pulse signal x' synchronized with a r...
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JP3290547B2 |
PURPOSE: To obtain a measuring apparatus by which a threshold is stabilized also in a high-speed running operation to the same extent as in a low-speed running operation by reducing the cutoff frequency of a low-pass filter, as a vehicle...
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