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JP4324676B2 |
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JP4282260B2 |
An echo canceller includes: an echo cancellation part canceling echo included in a near-end input signal; a noise suppression part employing a low-pass filter having a variable cut-off frequency adaptive to power of an input signal, the ...
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JP4282227B2 |
An apparatus for noise suppression has a converter for converting an input signal into a frequency-domain, an SNR calculator for determining a signal-to-noise ratio (SNR) using the frequency-domain signal, a spectral gain generator for d...
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JP4277333B2 |
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JP4275764B2 |
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JP4275855B2 |
The invention relates to the coding of speech at a variable bit rate, whereby the bit rates can vary from frame to frame, and more specifically to the methods and filters used for improving the quality of the decoded speech. In the solut...
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JP4270602B2 |
Clicks in voice and music signals are removed by detecting and interpolating the click. The use of a permanently set threshold value above the peak value of the audio signal is known for detecting the clicks, and interpolation carried ou...
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JP4272724B2 |
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JP4269820B2 |
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JP4267293B2 |
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JP4268524B2 |
A method of blind signal separation of convolutively mixed signals comprises firstly processing signals to produce second order independence. In a second step, and together with ranges of signal delay and rotation parameters, the resulti...
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JP4263586B2 |
A digital filter (2) comprising delay elements (D 0 - D m-1 ), multipliers (MP 0 - MP m ), and an adder (ADD), receives a digitized FM or phase modulated signal as its input (Xin(t)), and generates an output signal (Y(t)). A unit (3) det...
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JP4263553B2 |
An adaptive filter for an FM receiver comprises a digital filter, an error detection section for detecting an error err(t) between an output amplitude of the digital filter and a reference value, and a coefficient updating section 160 fo...
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JP2009100357A |
To provide a waveform equalizer for actualizing a reduced circuit scale, compared with conventional one.A filter part 11 uses a delay device group 111 consisting of (k-1) pieces of delay devices 1111-111k-1 connected in series to one ano...
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JP2009081851A |
To provide a method of identifying an unknown system with which a convergence time is made shorter than that in the prior art, in the method being adapted to identify an unknown system using an IIR type filter or a filter structured clos...
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JP4255849B2 |
A digital predistorter compensates for nonlinear distortion of a power amplifier using a power series model. The digital predistorter includes a distortion generating unit configured to introduce a nonlinear distortion component of a pre...
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JP4246562B2 |
An adaptive filter for an FM receiver comprises a digital filter (110), an error detection section (150,180) for detecting an error err (t-n) between the output amplitude Yenv (t-n) of the digital filter and a reference value Yth, and a ...
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JP4226395B2 |
An audio correcting apparatus includes a speaker provided on a television apparatus, a microphone provided on a remote controller, an identifying unit which identifies an acoustic characteristic from the speaker to the microphone, and an...
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JP4221222B2 |
A multi-channel filter ( 20 ) includes S inputs for receiving S input signals (x1 . . . xS) and at least S filters ( 14, 28 ) coupled to the S inputs for filtering the input signals (x1 . . . xS) or auxiliary signals (y1 . . . yS) derive...
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JP2009505529A |
A filter for reducing co-channel interference within a communications receiver may include a multi-channel, space-time filter circuit that filters n signal parts that have been split from a communications signal by jointly estimating spa...
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JP2009505530A |
A filter for reducing co-channel interference within a communications receiver may include a multi-channel, space-time filter circuit that filters n signal parts that have been split from a communications signal by jointly estimating spa...
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JP2009027548A |
To provide a signal processing apparatus and the like for calculating an adaptive linear filter for suppressing environmental noise or interference from other user even when a propagation status of a communication path is temporally vari...
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JP2009027418A |
To provide an equalization apparatus capable of performing equalization processing with high precision.An equalization apparatus comprises: a first storage section 2 for storing reception data Dr for one slot which are inputted in the or...
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JPWO2007010889A1 |
The adaptive digital filter of the present invention is a plurality of multipliers grouped into at least one multiplier and another multiplier based on the expected value of the filter coefficient 336.0~336N-1A filter unit that generates...
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JP4205509B2 |
An adaptive filter for an FM receiver comprises a digital filter (110), an error detection section (150,180) for detecting an error err(t) between the amplitude Yenv(t) of the output signal of the digital filter anda reference value, and...
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JP4195181B2 |
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JP4193814B2 |
A signal processing circuit includes a delaying unit that is configured to carry out delay processing on the basis of periodicity information synchronized with the periodicity of a periodic noise included in an input signal and a filter ...
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JP4186932B2 |
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JP4187968B2 |
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JP4187811B2 |
An adaptive (FFE) filter 24 adaptively filters a signal and updates a plurality of coefficients stored on capacitors 69 to minimise the error between the filter output at 72 and a set of notional reference values supplied by a reference ...
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JP4184342B2 |
A method and system for processing subband signals using adaptive filters is provided. The system is implemented on an oversampled WOLA filterbank. Inputs signals are oversampled. The system includes an adaptive filter for each subband, ...
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JP2008538420A |
A method for reproducing a secondary path in an active noise reduction system comprising a transmission path (S, 9', 10, 11), an adaptively adjustable filter (13), and an addition unit (14), the adaptively adjustable filter (13) being ad...
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JP4166000B2 |
To solve the problem of voice recognition efficiency being very poor, because there is no way of knowing the start of a voice recognition operation desired by a user, the voice of the user himself is superimposed upon operation of a canc...
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JP4162860B2 |
To immediately eliminate an audio sound signal and carry out speech recognition even when a state changes from a hands-free talking state into an audio state. A microphone 71 detects sounds inside a vehicle outputted from a loudspeaker 5...
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JP4163294B2 |
A noise suppress processing apparatus has a speech input section for detecting speech uttered by the speaker at different positions, an analyzer section for obtaining frequency components in units of channels by frequency-analyzing speec...
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JP4163896B2 |
An adaptive controller generates a sequence of dither signals for each of a plurality of control parameters. Each dither signal sequence is uncorrelated with every other dither signal sequence. Each nominal control signal has the first o...
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JP4163578B2 |
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JP4159318B2 |
A variable sample rate recursive digital filter is an adaptive digital filter where its coefficients are recalculated for each sample rate being processed in such a way as to maintain a constant frequency rate for all sample rates. An eq...
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JP4147647B2 |
Data processing apparatus includes a data processing section (2) for processing input data by a predetermined processing method and outputting the processed data, an input-data evaluation section (12) for evaluating the input data, an ou...
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JP4143398B2 |
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JP2008529073A |
A method for concatenating a first frame of samples and a subsequent second frame of samples, the method comprising applying a phase filter adapted to minimizing a discontinuity at a boundary between the first and second frames of samples.
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JP4125851B2 |
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JP4114228B2 |
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JP4109173B2 |
An adaptive equalization apparatus comprises an equalizer for equalizing a playback signal read from a recording medium, using tap coefficients; a maximum likelihood decoder for subjecting an equalized signal outputted from the equalizer...
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JP2008521308A |
Interference is suppressed as follows for a series of samples, which are related to a series of symbols and are at least 2 samples per symbol. The filter coefficient of the first whitening filter associated with intersymbol interference ...
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JP2008521280A |
An adaptive filter suitable for fabrication on an RF integrated circuit and used for transmit (TX) leakage rejection in a wireless full-duplex communication system is described. The adaptive filter includes a summer and an adaptive estim...
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JP4101317B2 |
An echo cancellation system uses recursive determination of transmit and receive gains (Grt, Get) using a calculated adaptive variable at depending on the return (yt) to direct (xt) signal power ration when the estimated direct signal po...
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JPWO2005045829A1 |
In the filter coefficient adjusting circuit of the present invention, the initial value of the equalization coefficient on the left side of the center tap of the FIR filter (1) that equalizes the reproduced signal is multiplied by n, and...
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JP4098842B2 |
The present invention provides for efficient echo cancellation in a voice-recognition system which includes barge-in capability. The system and method include a buffer controller (22) which stores the incoming signal received from a comm...
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JP2008519558A |
A method and apparatus generating an error signal and an update vector signal used to generate filter tap coefficients for an equalizer filter residing in an equalizer. The equalizer filter outputs an equalized signal in response to rece...
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