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JP3391373B2 |
To attain improvements in equalizing ability by suppressing estimation characteristics from deterioration due to an impulse response waveform, when using a delayed decision feedback sequence estimator. Impulse response of a transmission ...
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JP3391686B2 |
To reduce trouble of calculation and memory requirements by coupling a quantized error signal and a prediction coefficient and making coded audio signal. A signal processing unit 10 makes a set of a quantized frequency sub-band signal us...
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JP3391144B2 |
PURPOSE: To realize an efficient echo canceler using a DSP by reducing arithmetic processing quantity by band division technique. CONSTITUTION: A received input is band-divided by a receiving analyzer 100-1 and a transmitting input is ba...
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JP2003092542A |
To realize an estimation part of an adaptive equalization device with a simple configuration.A control circuit 50 performs learning for controlling a coefficient of a filter 30 so as to eliminate an error ei between a learning pattern di...
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JP3390574B2 |
To make it possible to faithfully reproduce a sound image to be reproduced even when the state of a reproducing sound field is changed. An acoustic input signal is adjusted to required amplitude and phase characteristics by sound image c...
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JP3390654B2 |
To obtain a control effect which natural in listening, when a target characteristic is changed when a sound transmission characteristic of a sound is controlled at a control point in a reproduction sound field to a target characteristic....
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JP2003510665A |
A method and apparatus for the real-time creation of an output audio signal from an input signal with an unwanted or noise portion. The system detects the unwanted portion of the input signal by utilizing an adaptive detection filter and...
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JP3387405B2 |
To reduce a training time without greatly increasing the circuit size in the decision feedback type equalizer which uses a RAM. During a training, a data memory 53 shown in (A) updates table retrieval data rA, which are to be updated, as...
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JP3387331B2 |
To obtain the abnormality signal detecting device which can detect an abnormality signal even when an abnormal component is small or in case of an outbreak signal and to obtain the abnormality signal source detecting device which can det...
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JP3384496B2 |
PURPOSE:To adapt adaptive algorithm of a lower order to an information environment change of a higher order by extracting a feature quantity from an input signal by a nonlinear adaptive system and recognizing an area in a signal space co...
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JP3385221B2 |
To remove the echo of a received signal from a local input signal, an echo canceler adaptively estimates the transfer characteristics of the echo path. When a double-talk condition is detected, the echo canceler reverses the adaptation p...
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JP3384493B2 |
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JP3383325B2 |
PURPOSE: To cancel respective higher harmonic components in an engine noise with good follow-up performance and stability. CONSTITUTION: Noise cancellation controllers 14-1, 14-2, and 14-3 are provided corresponding to respective higher ...
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JP3382639B2 |
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JP3382630B2 |
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JP3381731B2 |
PURPOSE:To prevent a desired voice itself from being reduce even in the case a voice which is not an objective one comes from a desired voice direction and mixed with a reference input in a noise reducing device. CONSTITUTION:The output ...
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JP3380759B2 |
Multiported register files used for storing coefficients in adaptive FIR are improved upon by implementing a split memory architecture (103,104) that has the ability to separately control the least significant bits and the most significa...
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JP3380571B2 |
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JP3381112B2 |
An echo removing apparatus for reducing the echo caused by sound generated turning from a speaker round to a microphone of a small-sized sound generated communication terminal, such as a portable telephone. A speaker output signal X(k), ...
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JP3379066B2 |
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JP2003505967A |
The invention relates, in the field of subband decomposition, to the design of filter banks adapted to the input signal statistics. In most cases, two channel filter banks are iteratively applied over several levels of decomposition, the...
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JP3371469B2 |
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JP3370594B2 |
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JP3370367B2 |
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JP3371256B2 |
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JP3368880B2 |
To provide an adaptive receiver having a DFE configuration employing an AMF that can prevent deterioration in its characteristic with respect to a minimum phase shift fading. The adaptive receiver is provided with an AMF 10 having a tran...
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JP3368575B2 |
To decrease the circuit scale without lowering the processing speed by giving phase rotation, corresponding to polyphase phase modulation to a replica of one series by a replica generator, generating another replica, and reducing multipl...
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JP3369884B2 |
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JP3366803B2 |
An adaptive equalizer performs adaptive signal processing on an input digital signal passing through a transfer path so as to minimize an equalization error and sends out a digital signal obtained by the adaptive signal processing. This ...
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JP3364325B2 |
PURPOSE: To reduce an operation quantity at the time of filter coefficient renewal without deteriorating a convergence speed in an active controller controlling a filter coefficient of a transversal filter so as to minimize a remaining n...
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JP3363254B2 |
PURPOSE: To stably muffle noise coming from the outside by constituting no electric loop in a noise control circuit and eliminating acoustic feedback from a control speaker. CONSTITUTION: Plural noise detectors 21a-21n are provided on po...
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JP3361637B2 |
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JP2002374149A |
To eliminate the influence caused by the configuration for adjusting the cut-off frequency of an LPFF circuit 21 of a variable-frequency filter circuit wherein by providing in it two LPFs F1, F2 comprising gm amplifies, a microcontroller...
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JP3359460B2 |
An adaptive filter in the form of an FIR or IIR filter performs an adaptive filtering process relative to an input signal using a plurality of tap coefficients. The adaptive filter derives a vector formed by absolute values of the plural...
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JP3356369B2 |
Failure to cancel echos at frequencies in which the frequency characteristics of sub-band filters in the X and Y analysis filter banks (103,105) overlap in subband echo cancelers is overcome by employing an X-analysis filter bank (103) i...
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JP3357122B2 |
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JP3358275B2 |
PURPOSE: To provide a muffler with a high operation speed and preventing from being affected by disturbance and noise and remarkably reducing the device cost. CONSTITUTION: An output (x') of a digital filter is supplied to an absolute va...
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JP3357725B2 |
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JP3358463B2 |
To make it possible to amplify voice in a large volume without howling by calculating in real time receiving voice signal level and controlling OFF-ON an adaptive filter at fixed high and low levels according to voice signal detection si...
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JP3354286B2 |
PURPOSE: To realize a multi-path elimination filter capable of converging the multi-path component surely in a short time. CONSTITUTION: A digital signal including a multi-path component received at an input terminal 10 is given at first...
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JP3355706B2 |
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JP2002354576A |
To obtain an apparatus for cancelling a noise capable of further enhancing followability by introducing a forgetful coefficient for deciding a weight of past data and adaptively controlling the coefficient. The apparatus for cancelling t...
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JP3351687B2 |
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JP3351532B2 |
An apparatus that automatically adjusts the adaptation block size for a least-mean square (LMS) adaptive filter depending on the input signal-to-noise ratio (SNR) is disclosed. The apparatus monitors the instantaneous SNR and continually...
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JP3347913B2 |
In a mobile radio telephone, an adaptive impedance matching circuit (25) is positioned between a transmitting power amplifier (24) and a duplexer (18). The adaptive matching circuit (25) matches an antenna (17) to associated electronic c...
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JP3348845B2 |
To decrease the number of registers and the power consumption and to speedily converge coefficients by performing coefficient adaptive operation by a non-pipeline processing according to input data and the filter operation data from a pi...
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JP2002539661A |
Device and method for separating a mixture of source signals to regain the source signals, the device and method being based on measured signals, the invention comprises: bringing each measured signal to a separation structure including ...
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JP2002538650A |
The ratio of useful-signal power to the power of interference signals at an antenna (ANT) having plural sensors, and at least one sensor is obtained by filtering the antenna output signal with a filter having a transfer function (W(t), W...
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JP3342986B2 |
It is an object to provide a Viterbi decoder which can execute a high-speed decoding process. An error value between a sample value obtained by sampling a read signal read from a recording medium and each of prediction values is obtained...
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JP3340496B2 |
The method comprises the steps of: generating white noise at an end of a one-dimensional sound field (2) that is defined by a linear ventilating system in which sound travels essentially parallel to the extended direction of the system; ...
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