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JP2000280831A |
To reduce a noise in a cabin arising from low frequency road noise. This noise controlling device is provided with a control means for inputting a signal which is highly related to a sound from a source of noise as a reference signal whi...
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JP3097731B2 |
To cancell ghost with a hardware of a small capacity by detecting a video signal transmission channel characteristic based on a ghost reference signal and using a corresponding canonical signed digit code(CSD) filter coefficient. A video...
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JP2000278186A |
To provide a noise canceler by which an estimate noise signal can accurately be calculated, many noises can be eliminated and speech quality during a speech can largely be improved. This noise canceler 10 is provided with an X register 3...
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JP2000278236A |
To prevent the deterioration of one symbol delay detection in a delay detector resulting from a reflected radio wave from each SFN in high mountains at the surrounding causing a multi-path component in excess of a guard interval or a spe...
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JP2000513161A |
An adaptive system and method for reducing interference in a signal received from an array of sensors. Adaptive filters are used to generate cancelling signals that closely approximate the interference present in the received signal. The...
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JP2000267754A |
To reduce the power consumption of a DSP(digital signal processor). The power consumption of a circuit realized by a program is dynamically controlled by dynamically reducing the number of machine cycles required for realizing a desired ...
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JP2000269865A |
To accurately compensate a phase even if the echo of a transmission line is large by installing a backward equalizer composed of a feedback loop in an equalizing processing part and arranging a phase compensation part in the preceding st...
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JP3090670B2 |
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JP3092647B2 |
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JP2000258478A |
To provide a spectrum analyzer precisely specifying a frequency of a line spectrum constituting an unknown input signal in a short time in relation to improvement of a spectrum analyzer specifying a frequency of each line spectrum with r...
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JP2000259159A |
To stably cancel noise by always updating the coefficients of a noise control filter, that synthesizes pseudonoise, properly in a feedback type active noise controller which generates pseudonoise having same amplitudes and inversed phase...
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JP3089794B2 |
PURPOSE: To provide the method for identifying an unknown system by an adaptive filter and its device in which the filter is immune to disturbance by an error signal and a short convergence time and a final error signal level after the c...
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JP3089082B2 |
PURPOSE: To generate a desired output signal not including a signal component for an undesired frequency range without being affected by a high frequency signal by eliminating the signal component of the frequency range of the high frequ...
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JP2000252891A |
To reduce errors concentrated at a frame end in the process of convergence of an adaptive filter, in a frequency area type echo canceller. Conversion frame generating sections 101, 102 of the signal processor overlap samples, before and ...
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JP2000252884A |
To prevent deterioration in echo cancellation in units of frequency by independently discriminating propriety of learning for each frequency, in a frequency region type echo canceller provided with an adaptive filter for each frequency. ...
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JP3087342B2 |
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JP3087491B2 |
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JP3086539B2 |
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JP3087314B2 |
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JP3083545B2 |
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JP3084721B2 |
PURPOSE:To minimize deterioration in sound quality by extracting a noise component for each band, detecting a masking threshold level, and comparing them to eliminate a noise component in excess of the masking threshold level from each b...
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JP3084883B2 |
PURPOSE: To attribute to the size reduction of an equipment and to prevent the deterioration of sound collection quality without a windscreen by eliminating noise components and minimizing the external influence to a sound signal. CONSTI...
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JP3081086B2 |
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JP3082898B2 |
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JP3082899B2 |
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JP3080641B2 |
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JP3081087B2 |
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JP3082089B2 |
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JP2000221985A |
To provide a failure detecting device usable for a suppressing device of vibrations existing in the interior of an automobile, capable of rapidly responding to changing noise emission, and capable of detecting only noise from a noise sou...
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JP2000224148A |
To obtain a steep equalizing characteristic and satisfactory phase characteristic, to make an equalizer with high performance small in size and to enable reduction of cost for a system as a whole by cyclically and repeatedly using an FIR...
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JP3074461B2 |
To secure a speedy measure to cope with changing sending out of noise and also to restrain only actually hindering noise of noise source by selecting one of vibration models depending on the detected drive condition, and sending out the ...
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JP3073976B2 |
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JP2000209135A |
To maintain a normal operation by a tap coefficient stored in a sub tap coefficient storage section even when a main tap coefficient is diverged. The echo canceller is provided with a main tap coefficient storage section 9 that updates a...
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JP3068440B2 |
PURPOSE: To attain proper distortion equalization, to make the circuit small and to reduce power consumption by detecting a timewise fluctuation rate of an interference control signal to control a time constant for averaging processing o...
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JP3068996B2 |
PURPOSE: To improve the estimate start of an adaptive filter used for an echo canceller or a noise canceller or the like and the convergence delay at a rapid change in an unknown system. CONSTITUTION: The filter is provided with 1st and ...
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JP2000200462A |
To prevent performing needless training after convergence upto an optimum state by confirming that an adaptive type transversal filter is converged to an optimum state. This device is provided with an adaptive type transversal filter 5 p...
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JP2000201055A |
To quickly change a tap coefficient for generating desired characteristics in the output of a waveform equalizer. A new tap coefficient is generated by a tap coefficient generating block 4 based on a preamble pattern (the fixed pattern o...
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JP3067222B2 |
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JP3067645B2 |
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JP2000196414A |
To monitor a tap coefficient that is always changed in response to a propagation state in real time by compressing an information quantity sent from a tap coefficient generator to a monitor control section so as to decrease a period when...
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JP2000196507A |
To provide an echo eliminating means for a multiplex channel with a small convergence time and less arithmetic quantity. The system has adaptive filters 80, 81, 82 that are provided for each channel so as to apply adaptive control to eac...
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JP3064685B2 |
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JP3063228B2 |
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JP3060884B2 |
PURPOSE: To provide an automatic equalizing circuit of partial response (PR) 4-detection system with simple configuration. CONSTITUTION: Comparators C1 and C2 respectively compare an equalizer output yn with reference values v1 and v2 so...
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JP3058307B2 |
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JP3059753B2 |
PURPOSE:To provide a noise eliminating device having a good noise eliminating effect by providing a filter for referring to a noise signal through a converting means as a noise reference signal, and eliminating noise for a main signal. C...
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JP2000508483A |
In a video conference facility, an echo cancelling device is provided which comprises an adaptive finite impulse response filter operable to sample the input signal to a loudspeaker and to model, on the basis of that signal, the signal f...
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JP3056492B2 |
An adaptive noise cancellation system reduces undesired noise in a closed loop control system by injecting an adaptively constructed noise cancellation signal at an appropriate point in the closed control loop. The generation of a compen...
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JP2000174672A |
To provide an echo canceller capable of accurately performing the learning of an adaptive filter and improving the effect of echo cancellation.In this echo canceller, reception signals x and transmission signals y are respectively divide...
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JP2000174592A |
To suppress increase in an estimate error with respect to the adaptive filter that controls a block length.A comparator circuit 130 estimates whether or not a level of a residual echo Ej reaches a level causing disturbance (1st threshold...
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