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JP3287971B2 |
PURPOSE: To improve the reception quality and the frequency utilizing efficiency by arranging equalizers used to estimate interference signals in parallel so as to cancel an interference signal thereby realizing a sufficient interference...
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JP2002515668A |
The invention relates to a method for calculating a least mean square algorithm using an N-tap filter. A modified least mean square algorithm is used for the calculation. In a first calculation step, calculation is effected using a first...
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JP2002515702A |
The invention relates to a data processing device for recovering digital data which is received in an analogue transmitted signal. According to the invention, the received signal is digitized and a threshold is determined in a threshold ...
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JP2002152014A |
To provide a coefficient adaptive processing technology that efficiently processes an adaptive filter.A data memory stores an input signal and a coefficient memory stores a coefficient vector. A multiplication and accumulation unit reads...
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JP2002152013A |
To provide a filter circuit whose characteristic frequency is adjusted by a filter adjustment circuit in which the adjustment accuracy and the adjustment time of the characteristic frequency can be improved and to provide a mobile commun...
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JP3281136B2 |
PURPOSE: To reduce power consumption by remarkably reducing processing computing quantity relating to the update of a tap coefficient and to improve echo suppression characteristic by improving computing accuracy in filter processing. CO...
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JP3278187B2 |
PURPOSE: To provide a movement adaptive type Y/C separating filter capable of reproducing an image having high resolution and reduced at the deterioration of picture quality in the case of converting a static image to a moving image or i...
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JP3277954B2 |
PURPOSE: To change the directivity continuously from a sharp directivity to a wide stereophonic state by adaptive signal processing. CONSTITUTION: A sum signal SM of stereo signals SL, SR from a couple of unidirectional microphones 11L, ...
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JP3277430B2 |
PURPOSE: To enable the high-density recording of the recording medium, to improve the error rate and to easily define data in the case of the Vitabi demodulation. CONSTITUTION: An 8-10 modulator 10 converts data into a code by using the ...
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JP3277451B2 |
PURPOSE: To obtain the Viterbi decoder in which accuracy of error correction is enhanced. CONSTITUTION: An equalizer 1 applies waveform equalization to an input signal to convert the signal into a signal with a partial response character...
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JP3275472B2 |
PURPOSE: To largely reduce a noise in a sound-proof room. CONSTITUTION: A sound-proof room 11 is equipped with an entrance side sound absorbing duct 12, exit side sound absorbing duct 13, and inspection room 14. Also, the sound-proof roo...
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JP2002111624A |
To overcome the problem of a prior art such that time is taken for convergence to an optimum value every time the number of delay waves by a multipath is increased and the estimation accuracy of a tap coefficient required for waveform eq...
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JP2002111551A |
To optimize an echo canceler so as to reduce as much as possible the required numbers of multipliers and adders in an adaptive filter which is a constituent component of the canceler.The echo canceler having, a false echo generator circu...
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JP3273051B2 |
PURPOSE: To evade the generation of an offensive pop sound which gives a passenger a feeling of physical disorder and unpleasantness and is generated when noise control is OFF by the easy method. CONSTITUTION: A reference signal correlat...
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JP2002101144A |
To provide a digital demodulator having an automating type filter having a small number of taps as compared with a delay time to be corrected.The digital demodulator comprises a filter M section 1M and a filter S section 1S having FIR fi...
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JP3269959B2 |
To provide the correlation filter with a small power consumption that is used by a portable equipment. A delay circuit 1 provides an output of plural tap output signals TP1-TPn with different delay times and a weighting synthesis circuit...
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JP3270289B2 |
PURPOSE: To prevent equalizing ability from being rapidly degraded by the increase of a noise component. CONSTITUTION: A non-equalized signal Sr is outputted as a forward equalized signal Sfe after inter-code interference caused by advan...
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JP3270480B2 |
This invention relates to an improved adaptive spectral estimator for estimating the spectral components in a signal containing both an information signal, such as speech and noise. The improvements relate to a noise power estimator and ...
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JP3271076B2 |
PURPOSE: To perform adaptive processing corresponding to the level of an audio signal component or that of a noise component. CONSTITUTION: Main input and reference input ((n*)-n) are formed from the output of microphones 1, 2. A compara...
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JP3271155B2 |
To output a compression parameter and compressed data as specified even when number of compressed data corresponding to the compression parameters is independent of a capacity of a 1st storage means. A 1st count means 10 uses a clock sig...
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JP2002509672A |
An adaptive filter is provided which has fixed point or floating point data stored in a data RAM (74) and block scale floating point coefficients stored in a coefficient RAM (84). The data and coefficients are utilized in a filter algori...
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JP3269690B2 |
PURPOSE: To perform highly precise sound field control through a small number of filters by compressing a sound field coefficient based upon a sound field impulse response adaptively to PASC and decreasing the number of parameter setting...
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JP3267911B2 |
To reduce an occupied area and a required number of elements by simplifying control of an adaptive equalizer following a least square means (LMS) algorithm. An input data memory 101 and a coefficient data memory 104 of an adaptive filter...
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JP3268408B2 |
PURPOSE: To prevent degradation in processing performance which eliminates degradation in voice quality and a noise and to always listen a voice in the best state. CONSTITUTION: This device is provided with analog/digital conversion proc...
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JP3266605B2 |
A DTMF receiver (10) recognizes each of a plurality of multi-frequency tones, each tone centered on a predetermined standard frequency. Two digital bandpass filters (14, 16) each have four frequency bins, each frequency bin operating acc...
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JP3267316B2 |
The receiver uses a signal processor (2, 21) with a sample-and-hold circuit (21), coupled to an A/D converter (22) and an equaliser (3) having a digital processing circuit (31...35) including a register (331, 332, 333) holding the condit...
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JP2002076997A |
To enable a factor estimating device for adaptive filter of multichannel system which simulates the characteristics of a plurality of signal transmission systems to estimate the impulse response of each signal transmitting system with hi...
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JP3264141B2 |
PURPOSE: To simulate and hear a sound after noise countermeasures are taken by performing convolutional operation for respective signals of noises or vibrations detected at plural points by a filter which shows spatial transmission chara...
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JP3264142B2 |
PURPOSE: To attain stable PLL control by taking the difference between a sum of tap coefficients at the right side of the center tap of an automatic equalizer and a sum of tap coefficients at the left side of the center tap of an automat...
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JP3260874B2 |
PURPOSE: To make a fast arithmetic operation possible and to save on power consumption by simplifying a circuit without providing a transmission power control circuit separately. CONSTITUTION: A modulator which controls a transmission po...
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JP3259104B2 |
PURPOSE: To decrease a detection error even against an error in the amplitude direction and the phase direction, with regard to the equalization detecting system for equalizing and detecting a receiving signal or a reproducing signal in ...
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JP3260102B2 |
To eliminate instability due to changes over aging and the change in an environment in the case of canceling sound radiated to the rear of a speaker for reproduction by the speaker. For this sound reproduction device, two speaker units 1...
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JP3260078B2 |
To realize an acoustic reproducing device with a small-sized speaker system, in which disturbance of a characteristic due to interference of sound emitted from a rear side of a reproduction speaker is prevented so as to attain excellent ...
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JP2002057606A |
To provide an application filter which is high enough in resistance to errors caused by double-talk or the like and used for cancellation of echoes.An acoustic echo canceller 10 is equipped with an (application) filter 11, an application...
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JP2002505834A |
A digital filter includes a plurality of filter cells, each of which includes circuitry to determine a coefficient for the filter cell, to adjust the coefficient in accordance with a gain that is used by each of the plurality of filter c...
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JP3257926B2 |
PURPOSE: To provide a digital filter processor which can perform the real-time procesing at a high speed. CONSTITUTION: This processor inputs the image data (x, y) on a screen and peforms the filter procesing in every group of data (x, y...
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JP3256646B2 |
PURPOSE: To eliminate an equi-level interference signal and an unknown interference signal. CONSTITUTION: Transversal filters FFF1-FFFNB apply weighting to received signals by antennas 1-1 to 1-NB and a synthesis means 3 synthesizes the ...
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JP3252500B2 |
PURPOSE: To provide a bidirectional amplifier for amplifying an attenuated signal in a two-wire transmission line. CONSTITUTION: A white noise 14a is impresssed to the input terminal of a hybrid circuit 11a for executing 2-wires/4-wires ...
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JP3251023B2 |
An automatic equalizer includes an adaptive matched filter (302) connected in front of a decision feedback equalizer (301) of a conventional design. The adaptive matched filter has an A/D converter (12) for sampling and quantizing an ana...
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JP3250577B2 |
PURPOSE: To implement adaptive processing effectively by devising the processing unit such that it processes a non-steady signal as a steady signal. CONSTITUTION: A 1st A/D converter 20M converts a major input signal into a digital signa...
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JP3250801B2 |
There is disclosed a system and method for generating coefficients for use in a digital filter. The coefficients are generated utilizing an iterative adaptive process employing a least mean square process wherein the filter coefficients ...
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JP3250439B2 |
To attain natural 2-way speech by suppressing howling or echo in the case of hand-free speech in telephone speech and avoiding one-way speech. A microcomputer 16 receives transmission voice amplification data from an A/D converter 15 and...
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JP3251432B2 |
PURPOSE: To simultaneously determine a time slot position and a frequency offset in a radio communication system for performing communication with digital coded signals. CONSTITUTION: A received digital coded signal is normalized 96, sto...
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JP3251627B2 |
PURPOSE: To obtain a stable characteristic both for an in-band signal and an out-band signal in the waveform equalizer eliminating waveform distortion of a signal with band limit. CONSTITUTION: Waveform data in an output of an A/D conver...
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JP3250678B2 |
PURPOSE: To prevent divergence of the algorithm. CONSTITUTION: Digital data recorded on a magnetic tape 1 are reproduced by a magnetic head 2, equalized by an equalization circuit 7 consisting of an FIR transversal filter 5 and an arithm...
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JP2002027510A |
To provide a tone detection device and its detection method that has higher frequency and time resolution than before regardless of a simple configuration.A tone signal detection part 10 uses a band elimination filter to a filter process...
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JP2002026692A |
To provide an adaptive filter with a small circuit scale and a small power consumption.The adaptive filter has taps 100, 200 that generate delay data resulting from delaying input data and calculate estimate data on the basis of the dela...
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JP2002502137A |
A method for processing filter tap coefficients in an echo canceller comprises adapting high-energy filter tap coefficients and low-energy filter tap coefficients using adjustable gain constants; and separately adapting the high-energy f...
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JP2002502193A |
A beamformer is calibrated for use as an acoustic echo canceler in a hands-free communications environment having a loudspeaker and a plurality of microphones. To perform the calibration, a number of adaptive filters are provided in corr...
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JP3248261B2 |
PURPOSE: To prevent divergence. CONSTITUTION: A signal reproduced from a magnetic tape 1 is equalized by a signal equalizing circuit 5 composed of a FIR transversal filter, and supplied to a decoder 6. The decoder 6 compares this signal ...
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