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JP2005229312A |
To provide an adaptive digital filter capable of performing the high-speed processing of the operation of an update value a[n+1] of a coefficient (a) with a small-scale circuit configuration.The adaptive digital filter 1 is provided with...
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JP3685503B2 |
PURPOSE: To provide an electronic silencer contrived to make remedy against the noises in the frequency band in the noises which cannot be reproduced by a sound producing body and the noises specified to a specific frequency band. CONSTI...
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JP3680009B2 |
To easily improve the rise responsiveness of an echo canceller by making the tap coefficient of an adaptive filter to be able to be converged in a short time with a small computing amount. This echo canceller is provided with a second ad...
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JP3679832B2 |
PURPOSE: To reduce vibration and noises even under extremely cold temperature circumstances by storing impedance values expected between the electric terminals of an electrically driven actuator according to the control frequency of a vi...
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JP3674963B2 |
PURPOSE: To remarkably reduce operation amount in an active noise controller and an active vibration controller using adaptive algorithm. CONSTITUTION: The controller 20 is constituted of a drive signal generation part 21 convoluting a r...
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JP3675484B2 |
PCT No. PCT/EP95/04472 Sec. 371 Date Nov. 25, 1997 Sec. 102(e) Date Nov. 25, 1997 PCT Filed Nov. 14, 1997 PCT Pub. No. WO96/16495 PCT Pub. Date May 30, 1996A system for equalizing an input signal including a datastream modulated on a car...
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JP2005522136A |
A computationally efficient, adaptive multistage Wiener filter employs two modules, a linear filter module that operates at the input data rate and an update module that operates at a plurality of rates but performs many calculations at ...
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JP3674111B2 |
To reduce an error rate in a Viterbi decoder by obtaining a proper soft discrimination value. A length V of a consecutive transmission series possibly incident is selected larger than a memory length L of a transmission line (V>L). 2N-se...
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JP3671426B2 |
PURPOSE: To obtain a satisfactory error rate by calculating inter-code interference from the output signal of a linear equalizer and the final discrimination value and successively updating the lookup table of a nonlinear canceller. CONS...
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JP3667478B2 |
To improve echo elimination when the transmission loss of an NES (near edge sound signal) channel is larger than that of an FES (far edge sound signal) channel (cellular telephone, for example). A near edge sound detector supplying 'coar...
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JP2005174472A |
To provide an automatic equalizer in which the satisfactory converged state can be obtained in a short time and the stability of convergence is also satisfactory.In an automatic equalizer 15 configured so that, when equalizing a signal x...
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JP2005159467A |
To alter the characteristics of an equalizer depending on the characteristics of a radio transmission line.A linear filter section 20 is provided with a plurality of taps and equalizes an input signal 202 of an equalizer to produce a fil...
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JP3661063B2 |
PURPOSE: To provide an active vibration noise control device which has a multi- channel active vibration noise control function and in which quantity of operation is reduced, the result of vibration noise reduction can be sufficiently im...
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JP3658708B2 |
PURPOSE: To provide an active model which gives a control acoustic route adjusted to an actual and desired response characteristic or matched to it and positively cancels or reduces sound or vibration. CONSTITUTION: An acoustic device 20...
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JP3658409B2 |
A device and method for removing co-channel conventional television signal interference from a digital signal by using an adaptive filter which tunes to the periodic components of the conventional television signal. The output of the ada...
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JP3655006B2 |
To eliminate a frequency component which does not reach a level high enough to generate a speaker sound when the frequency component is present in a source microphone detection signal by performing amplification adjustment by an equalize...
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JP2005135532A |
To obtain a determination value by a FDTS (Fixed Delay Tree Search) whose determination performance is improved compared to that of a threshold determining unit while performing PR (Partial Response) equalization.In a waveform equalizer ...
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JP3652705B2 |
A system and method for detecting convergence in an echo canceller prevent false convergence from occurring as a result of receiving only tones in an input signal. An adaptive filter is used in an echo canceller to estimate an echo signa...
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JP3648860B2 |
To realize the improved successive least square (RLS)/sampling inverse matrix (SMI) adaptive algorithm system in which an arithmetic operation amount is reduced while utilizing performance of a conventional system. Part of a radiation tr...
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JP2005513874A |
An echo canceller comprises a signal input for a far end signal, an audio input for a distorted desired signal, an echo estimator coupled to the signal input, and a spectral subtracter coupled to the echo estimator and the audio input. T...
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JP3636772B2 |
PURPOSE: To actively perform a noise elimination with a simple constitution without using adaptive filters such as DSP by dividing sampling data and determining membership functions every sections. CONSTITUTION: In the noise elimination ...
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JP3635644B2 |
To provide an echo canceler which can reduce residual echoes more surely. This echo canceler has an echo cancel part 4 and a noise suppression part 11, and the echo cancel part 4 has a function of generating pseudo echoes by passing a re...
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JP3631668B2 |
To provide a method and device for identifying system by which the characteristics of an unknown system which makes the convergence of an adaptive filter maintainable even when a disturbance is added due to the voice of a near-end speake...
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JP3631387B2 |
To attain reduction in chip size and drive circuit by receiving a second rectified signal and a filtered signal and providing a slicer means for generating an output signal corresponding to these signals. A reception circuit 50 has an op...
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JP2005507613A |
The invention concerns an asynchronous receiver for digital transmission and recording systems. The receiver comprises a sampling rate converter (SRC) for timing recovery, preceded by a digital adaptive equalizer operating at the samplin...
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JP3630635B2 |
To obtain a tap length adjustment device and its method for an adaptive equalizer, that can be variably applied to a tap number of the adaptive equalizer. The filter tap length adjustment device for an adaptive equalizer of this inventio...
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JP3629059B2 |
PURPOSE: To regenerate reception data and a burst reception signal without degrading the bit error rate characteristic of the reception signal by providing an MLSE equalizer capable of high-speed processing. CONSTITUTION: A replica gener...
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JP3625325B2 |
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JP3624805B2 |
There are provided a plurality of filter units provided in corresponding relation to a plurality of predetermined directions on a one-to-one basis, and each of the filter units processes an input tone signal with predetermined transfer c...
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JP3625989B2 |
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JP3621719B2 |
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JP3621714B2 |
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JP3621710B2 |
An adaptive filter or equalizer for digital data communication includes, a first cascade circuit connected to operate as a digital finite impulse response (FIR) filter, the first cascade circuit having a first plurality of input taps for...
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JP3621718B2 |
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JP3620124B2 |
To restore normal data communication without disconnecting a communication line even in the case of a quick variance of a reception signal. After the end of negotiation, a coefficient control part 7 sets the variable mode, where paramete...
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JP2005039687A |
To reduce the power consumption of a waveform equalizing device and to reduce a circuit area as regards the waveform equalizing device for adaptively equalizing the waveform of a digitally modulated signal.This waveform equalizing device...
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JP3616401B2 |
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JP3616523B2 |
To realize an echo canceller capable of convergence within about twice the time which is equivalent to the number of taps of an adaptive filter. This echo canceller is provided with an adaptive filter 25, having plural registers 10.0-10....
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JP3617079B2 |
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JP2005503093A |
Transmit amplitude independent adaptive equalizers are provided that compensate for transmission losses in an input signal when the transmit signal amplitude is unknown. Several embodiments are provided, including a first embodiment havi...
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JP3613801B2 |
PURPOSE: To prevent the useless control in which only power is wasted and no vibration reducing effect is effective, and the inadequate control so as to influence adverse effect on operation performance, etc., from being executed in a vi...
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JP2005020515A |
To switch the filter coefficients of a delay control filter inserted into a feedback signal path in order to adjust the phases of a transmission signal and a feedback signal at high speed in the case of comparing the transmission signal ...
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JP3611472B2 |
High-order partial response equalization is performed so that the equalization error of an input signal having non-linear distortions is minimized, thereby improving the characteristics of a reproduced signal. An input signal is subjecte...
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JP3612129B2 |
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JP3609611B2 |
To improve a learning speed and learning accuracy without deteriorating the sound quality of an output signal. An input signal digitized by an A/D converter 20 is sampled and inputted to a whitening filter 18 as a reference input signal ...
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JP3609557B2 |
To perform the equalization of digital telephone, especially, mobile telephone. The equalization of tone to be reproduced due to an equalizer 4 is changed corresponding to the operating state of telephone. The information concerning that...
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JP2005006317A |
To provide a signal separating apparatus and method using least square algorithm.The signal separating apparatus utilizes an adaptive FIR filter which operates on the basis of the least square algorithm analyzed result, for a first mixed...
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JP2004538701A |
A system and method for compensating switched mode amplifiers. The amplifier system includes an adaptive filter coupled to the output of circuitry that recovers the analog signal from the output of the switching amplifier circuitry. The ...
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JP2004537941A |
A filter adaptation unit suitable for producing a set of filter coefficients is provided including an error characterization unit for characterizing the error in a filter's impulse response. The error characterization unit generates a se...
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JP2004343340A |
To provide a waveform equalizer capable of improving reception performance by selectively equalizing waveforms regardless of the presence/absence of a waveform equalizing function in the case that there are the delay waves of delay time ...
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