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JP3591902B2 |
A decoding circuit for a magnetic recording and reading system enables the implementation of an AGC loop with a relatively simple configuration and further enables easy clock extraction and high operating speed. The level setting system ...
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JP3591068B2 |
A method for reducing noise in a speech signal is provided for restraining suppression of a predetermined band when an input speech signal has a large pitch strength. The noise reduction method is executed by the apparatus having a signa...
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JP3589471B2 |
PURPOSE: To effectively and satisfactorily equalizer a received digital signal in all reception conditions to cope with an inter-symbol interference at the time of reception of the digital signal in a cellular radio system or the like. C...
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JP3590096B2 |
PURPOSE: To prevent the enlargement and the cost increase of a system by providing noise cancel processing parts by only the number of individual noise sources even when plural detection sensors exist. CONSTITUTION: Signals outputted fro...
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JP3590473B2 |
To maintain a probability of error detection constant in the function of S/N ratio, while keeping the probability of detection error to a minimum by providing a sampling circuit for extracting an input signal and a signal demodulator pre...
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JP3586452B2 |
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JP3586033B2 |
To eliminate a noise component by arranging an adaptive filter to an intermediate frequency stage. An input analog signal is sampled by a sampling frequency fs by a multiple of 4 of a carrier frequency fc. A demultiplexer 11 demultiplexe...
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JP3582712B2 |
To reduce distortion of the object sound components of an output without having to enlarge a device scale, in a sound pickup device. Signals received by microphones 111 to 11M are supplied to a caller position estimating part 15A. The ca...
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JP3580931B2 |
To maximize a generating efficiency of induced vibration by activating a structural vibration or an acoustic vibration in real time and detecting the vibration so as to make an exciting frequency in matching with an object frequency at a...
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JP3581775B2 |
A designing system for adaptively characterizing an audio transmitting system has a white noise generating unit for generating a white noise signal. A speaker radiates the white noise generated by the white noise generating unit into an ...
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JP3579508B2 |
To provide an audio device capable of making a music signal at an observation point coincide with a target signal. A prescribed transfer characteristic is set by deciding coefficients of filter means 25, 26 based on the layout of front l...
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JP3578783B2 |
An acoustic image localization apparatus localizes an acoustic image of a plurality of tone color species having various timbres to a source point with respect to a listening point within a sound field. Desired ones of separate source po...
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JP3579898B2 |
PURPOSE: To propose the vibration control unit and method for the vehicle which can greatly be reduced in the calculation quantity of filter processing. CONSTITUTION: For the vehicle vibration control method which generates control vibra...
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JP3575775B2 |
To provide a sound pickup system combined with a video aiming system and a setting method for a characteristic parameter for sound pickup. This system is provided with a control unit 300, a means 400 for setting a characteristic paramete...
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JP2004282738A |
To provide a method and apparatus for adaptively eliminating interference from a signal.A received signal is linearly amplified along with a first signal path to feed a first signal, and nonlinearly amplified along with a second signal p...
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JP3573241B2 |
To provide an echo canceling method and a device by which an echo signal is sufficiently canceled without causing deterioration in speech quality depending on the quantity of a transmission delay. A filter coefficient of each of adaptive...
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JP2004266726A |
To provide an echo canceller capable of more quickening adaptation of a filter coefficient for an initial lock period while suppressing cost increase.The echo canceller performs an arithmetic operation of the filter coefficient ω(n) of ...
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JP3568105B2 |
To enable flexible adaptation to the variation in transfer characteristics and to improve the adaptation speed by updating the orthogonalization coefficient of a specific frequency component of an adaptable signal generated by adaptable ...
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JP3568665B2 |
A subband acoustic echo canceller for a telecommunications teleconferencing room is equiped with subband adaptive filters and filter taps associated with said subbands. A data store is provided containing a weight list for controlling al...
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JP3567479B2 |
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JP2004528779A |
A method for an adaptive equalization apparatus in a multiple-link hopping radio system includes hopping among a plurality of radio links to receive variable-length bursts of radio signals on the plurality of radio links and equalizing a...
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JP3564974B2 |
To provide an adaptive control method of cyclic signals, in which convergence stability of adaptive control and follow-up ability to changes of the angular frequency of the cyclic signals to be suppressed are compatible. This adaptive co...
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JP3565846B2 |
An algorithm is described for sparsely updating the filter coefficients of an adaptive filter of an adaptive audio system to facilitate a high sampling rate without excessive processing capacity. Computer simulations are used to illustra...
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JP3566788B2 |
A method and apparatus for inter-cross wave compensation. There are provided a frequency conversion unit for performing frequency conversion for one of two received polarized wave signals, an analog/digital converter for converting the o...
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JP3566158B2 |
To provide an echo canceler which does not depend on use environment, whose circuit scale is not enlarged, in which deterioration of echo cancellation is eliminated and which generates an echo canceler output signal without delay. Subtra...
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JP3559599B2 |
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JP3560695B2 |
To provide a receiver having an equalizer capable of improving the characteristics of demodulating operation under multipass fading. At the time of converging errors E1, E2 between the received signals of 1st and 2nd branches in adaptive...
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JP2004242327A |
To reduce or eliminate disadvantages and problems associated with previous techniques for processing a received signal by which relatively slow and inefficient digital signal processing is performed.Processing of a received signal includ...
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JP3558954B2 |
To provide a howling suppression device capable of reducing an operation scale and shortening operation time. In this howling suppression device provided with a digital filter 4 for turning a howling frequency included in digital input s...
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JP2004235857A |
To avoid falling into a divergent state by such control that the update of weighting is turned off when detecting no signal or the like in a reproducing device provided with an adaptive equalizer.The adaptive equalizer is provided with; ...
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JP3554226B2 |
A switch 404 sends an output of a reception processing section 402 to a training processing section 405 at a training processing time and to a demodulation processing section 407 by control of a timing control section 403. The training p...
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JP3549606B2 |
Analog signals representing individual digital values (+3,+1, -1,-3) of data pass through a telephone line to a receiver (22). These signals may first be provided in a pseudo random sequence. A linear echo canceller (34) and a first adde...
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JP3548293B2 |
To properly adjust a gain by simple constitution by controlling a gain control part so that the gains of a noise signal amplifying part and an error signal amplifying part are made to be almost the same by means of a second sound source....
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JP3548203B2 |
PURPOSE: To enable an equalizer to equalize a received signal consisting of 2B1Q encoded multilevel signals S(-3), S(-1), S(+1) and S(+3) corresponding to prescribed signal levels -3, -1, -1 and -3. CONSTITUTION: This equalizer is provid...
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JP3545082B2 |
PURPOSE: To provide a noise reduction device capable of rapidly and surely reducing a noise in space to be muffled without being affected by a noise state and an environmental state such as a temp. and humidity, etc. CONSTITUTION: In the...
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JP3544677B2 |
PURPOSE: To obtain the in-cabin indistinct sound reducing device which has superior follow-up performance and stability. CONSTITUTION: The signals from an air suction amount sensor 5 and a crank angle sensor 7 are inputted to a signal co...
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JP3540179B2 |
To provide an adaptive finite impulse response(FIR) filter which uses a time multiplex multiplier, having multiple coefficients every multiplier in particular in the FIR filter. This multiple port register film 101 stores a coefficient u...
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JP3537962B2 |
To extract all sounds from person's positions or only the sound from a specific person's position by determining a filter coefficient according to a person's position to be processed which is selected out of detected person's positions o...
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JP3536993B2 |
PURPOSE: To correctly obtain a multivalued signal code value even when local fluctuation exists by generating a threshold value from an envelope waveform based on a voltage value corresponding to a nonzero point, a zero point estimated f...
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JP3537150B2 |
PURPOSE: To improve elimination characteristics corresponding to variation in noise frequency. CONSTITUTION: The noise controller that eliminates a noise by outputting a sound wave which is opposite in phase and equal in sound pressure t...
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JP3538440B2 |
PURPOSE: To realize an in-automobile compartment noise reducing device in which an engine noise and a confined sound generated dependently of the number of engine rotation can be suppressed, and to attain cost reduction by sharing it wit...
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JP3533038B2 |
To reduce the time for restoration from a channel fault caused suddenly such as a phase hit by providing a reception control means to set a calculation coefficient of a synchronization correction means based on an error signal detected b...
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JP3533697B2 |
PURPOSE: To provide an adaptive filter and the adaptive filter treating method in which the characteristic of the filter is improved so that the filter characteristic adaptive to an input signal is obtained and an error due to, e.g. corr...
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JP3532583B2 |
PURPOSE: To improve the sound elimination performance by increasing the coefficients of an adaptive filter or that of a filter for filtered X signal genera tion as the total of the number speakers and the number of microphones of the noi...
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JP2004153575A |
To increase a clock speed and a sampling speed and contribute to a reduced power consumption amount by shortening the critical path of an overall equalizer including algorithm and blocks with a minimum delay time.When configuring a blind...
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JP2004153578A |
To provide an adaptive equalizer which has a configuration suppressing the increase of a circuit scale due to multipliers etc, and requires small power consumption, and comprises many filter taps.An approximation unit 30 approximates the...
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JP2004147103A |
To suppress the operation speed of an LSI to a low level, and realize miniaturization, light weight and low cost of a mobile terminal.Adders 120a-1 to 120a-4 obtain channel estimation coefficients updated on the basis of a multiplication...
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JP3527634B2 |
To make a blind equalizing method adaptive to the blind equalization of a decision feedback equalizer(DFE). A feedforward section 955 and a feedback section 965 of a DFE use different types of tap-updating algorithms. In particular, a st...
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JP3522018B2 |
To detect the abnormality of the action of a noise controller. An adaptive filter 71 which generates a cancel signal by inputting an engine pulse as a reference signal and an error signal as feedback, is arranged in a noise controller eq...
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JP3522986B2 |
To improve the service quality by accurately cancelling the noise component included in a voice signal. A noise frame is orthogonally converted by an FFT fast Fourier transform) 103, and its conversion coefficients are divided into N gro...
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