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JPWO2002058053A1 |
The present invention relates to the coding and decoding of digital audio data, which corresponds to various digital contents and enables the reproduction speed to be changed without impairing the intelligibility of the audio. In coding,...
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JP3531178B2 |
PURPOSE: To efficiently perform coding with the minimum hardware scale by providing respective steps for information compression processing and information expansion processing and sub-sampling the frequency band component at the high fr...
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JP3529970B2 |
To receive/reproduce information on a desired hierarchy with high quality, without using a highly precise band pass filter and without being affected by interferences on a reception side by providing reception filters before and after th...
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JP3531177B2 |
PURPOSE: To provide a compressed signal corresponding to an input signal even when a hearing model or respective constants to be prepared are not suitable for the input signal or even when the input signal is any unexpected signal. CONST...
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JP3526741B2 |
To transmit two parallel logical channels with higher efficiency by means of a code division system by preparing a coupling means which compiles a communication message based on the diffusion data on a 1st channel and the diffusion data ...
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JP3519859B2 |
To obtain coded and decoded signals without the power loss of an original signal, by providing a bit assigning means and a quantization means, etc., quantizing plural partial band signals generated by a band dividing means based on bit a...
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JP3520554B2 |
PURPOSE: To apply even to various waveform patterns and to effectively reduce quantization noise by finely correcting respective sample data. CONSTITUTION: The relation between amplitude patterns (1), (2),..., (7) consisting of lines of ...
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JP3519764B2 |
PURPOSE: To prevent degradation of reproduced sound by using the coefficient and gain of a synthetic filter by replacing them by the values corresponding to one vector just before and performing decoding without performing a post filter ...
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JP3521596B2 |
To improve compressibility by dividing a signal component into plural 1st band units as the units of encoding and plural 2nd band units for setting the initial value of quantization accuracy, and setting the initial value of quantization...
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JP2004120193A |
To provide a digital receiver reducing phase distortion of an analog signal produced by converting a digital audio data sequence transmitted on a radio transmission line.Time series digital audio signals demodulated from transmission sig...
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JP3518737B2 |
To provide an audio encoding method that uses window functions to conduct overlap encoding. In the audio encoding method that uses at least 4 kinds of window functions of a long window, a short window, a start window, an a stop window to...
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JP2004109244A |
To provide voice communication that eliminates the need to transmit noise information to be voiceless section voice information on a reception side, solves a problem of a decrease in transmission efficiency, and gives no feeling of physi...
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JP3515142B2 |
PURPOSE: To provide a data transfer controller capable of executing much continuous data transfer without reducing the performance of a CPU. CONSTITUTION: This data transfer controller is constituted of an interface 102 with an external ...
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JP3514978B2 |
To provide a digital switching amplifier whose power efficiency is satisfactory and which can obtain a sufficient S/N even if the amplitude of an input signal is small. A digital switching amplifier is provided with a quantizer 3 which Î...
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JP2004104228A |
To eliminate a defect of a spurious signal depending on an input to delta sigma (ΔΣ) modulation.A fractional frequency divider 26 includes a latch 31 for latching frequency division data; a ΔΣ modulator 33; a digital dither circuit 3...
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JP3513508B2 |
To synthesize signals with a simple configuration and also to restore the original signal from the synthesized signal. One-bit digital signals S1(I) and S2(I) outputted from signal sources 1 and 2 are synthesized by time division through...
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JP3513285B2 |
To reduce the packaging area and the power consumption and to efficiently process data corresponding to the coding system of plural voice frame lengths in the voice coding/decoding system which employs the coder and the decoder using the...
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JP3512347B2 |
To simplify management of input output data by transferring coded data in n-bit among data stored in a 2nd data storage means to a 2nd external storage means, shifting normalized data in the 2nd data storage means by n-bit and updating d...
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JP2004094090A |
To reduce a deterioration in sound quality of audio data, which occurs when the audio data once subjected to compression processing are once expanded to apply the compression processing again.The multiplexed audio data formed by compress...
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JP3509861B2 |
PCT No. PCT/IB94/00007 Sec. 371 Date Jan. 5, 1995 Sec. 102(e) Date Jan. 5, 1995 PCT Filed May 2, 1994 PCT Pub. No. WO94/25961 PCT Pub. Date Nov. 10, 1994A coder/decoder for samples of speech or other audio signals with bit rate reduction...
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JP3509862B2 |
PCT No. PCT/IB94/00007 Sec. 371 Date Jan. 5, 1995 Sec. 102(e) Date Jan. 5, 1995 PCT Filed May 2, 1994 PCT Pub. No. WO94/25961 PCT Pub. Date Nov. 10, 1994A coder/decoder for samples of speech or other audio signals with bit rate reduction...
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JP3508146B2 |
PURPOSE: To perform an orthogonal transform and an inverse orthogonal transform with a small amount of hardware and computations. CONSTITUTION: The coder decoder decodes coded signals by the following processes. The output which is filte...
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JP2004088246A |
To improve the data transmission efficiency in a wireless communication system and to improve the communication quality without complicating a decoding circuit of a receiving device.A wireless packet stores a plurality of coded words. Ea...
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JP2004508755A |
Estimating a compression gain obtainable in compressing a given audio signal, comprising extracting a signal power in a selected frequency band of the given audio signal, and obtaining an estimation of the compression gain by correlation...
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JP3506761B2 |
PURPOSE: To obtain a tranceiver device used for a microcontroller and a symbol encoder/decoder device (forming a node in a communication network) so as to send and receive a variable pulse-width modulated(VPWM) analog signal including a ...
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JP3507686B2 |
To compare/discriminate sound with desired accuracy, without the need for a large memory space by providing a voice input means, a first storage means for storing a plurality of code vectors and a second storage means storing a desired i...
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JP2004507191A |
A method and signal processing apparatus for reducing the number of bits of a digital input signal (Mi), includes adding a pseudo-random noise signal (Na) to the digital input signal (Mi) to obtain an intermediate signal (Di), the pseudo...
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JP3502639B2 |
In the coding and decoding of stereo audio spectral values both the intensity stereo process and prediction are used in order to achieve high data compression. If intensity stereo coding is active in one section of scale factor bands, th...
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JP2004505506A |
A digital data modulator is coupled to a source of a digital data signal. An encoder encodes the digital data using a variable pulse width code. A pulse signal generator generates pulses representing edges of the encoded digital data sig...
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JP3498375B2 |
PURPOSE: To provide an audio signal recording and reproducing device in which low frequency region signal components are reproduced in a conventional reproducing device and the signals in a high frequency region are also reprocessed. CON...
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JP3496618B2 |
To reduce the average transmission bit rate of a silent voice part in performing the coding of a voice. A silent voice part coding circuit 70 codes an input signal from an input terminal 51 for every frame to deliver an obtained quantiza...
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JP2004504756A |
Coding a data stream comprising: channel coding (11) respective partitions of a given part of the data stream with different error protection rates to obtain a coded data stream (WS1), and including (20, 14) length information (lf) conce...
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JP2004504752A |
Coding a data stream comprising: channel coding (11) respective partitions of a given part of the data stream with different error protection rates to obtain a coded data stream (WS1), and including (20, 14) length information (lf) conce...
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JP3492632B2 |
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JP3490685B2 |
A pitch search method and device for digitally encoding a wideband signal, in particular but not exclusively a speech signal, in view of transmitting, or storing, and synthesizing this wideband sound signal. The new method and device whi...
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JP3490666B2 |
To stably execute a demodulation operation, even if a system is in an inferior reception state in OFDM hierarchy transmission by setting a frame to be one, where plural modulation systems correspond to different carriers. In a transmissi...
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JP3491425B2 |
To encode an audio signal in real time with the small hardware. A spectral signal component of an input signal is divided into coding units being a unit of coding, an estimated value of the required number of bits for each coding unit is...
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JP3490324B2 |
To realize a natural reproducing sound without reproducing an unpleasant sound by sending a characteristic of a background noise caught as a short time characteristic and a long time characteristic on a transmission parameter and reprodu...
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JP3490325B2 |
To reproduce a high naturalness and high quality voice with an over- poweringly low bit rate while suppressing quality deterioration by specifying a frequency band of an input voice to the band of about 5 kHz and balancing an information...
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JP2004023389A |
To provide a data interpolation method whereby a time required for data processing and the circuit scale can effectively be reduced when a transmitter-receiver or a data recovery apparatus or the like performs waveform shaping for demodu...
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JP2004020752A |
To decrease quantity loss of the transmitted light for communication by properly controlling an optical path switching element.An optical switch 1 is provided with one or more input optical fibers 3 and a plurality of output optical fibe...
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JP2004502176A |
A radio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit which calculates a relative frequency relationship between an internal oscillator of the RFID tag device and an external PPM sour...
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JP3484341B2 |
To control encoding processing based on a load supervisory result of signal processing and to reduce processing load at the performing of band division of an audio signal of a multi-channel, when performing encoding transmission. This de...
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JP3483958B2 |
PURPOSE: To obtain the wide-band speech restoring device which restores a wide-band speech signal of high quality by estimating a stable wide-band sound source with a correct amplitude from a narrow-band speech or narrow-band speech code...
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JP3481535B2 |
To decrease the number of signal lines of a synchronous serial interface by putting a preamble code word into a data stream to be transmitted and detecting the preamble code word contained in the data stream via a synchronous preamble de...
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JP3479495B2 |
To achieve a high-quality coding regardless of a musical signal or a voice signal. In a CELP(code excitation linear predictive) coding system, a lower-order synthesis filter 14 and a cascaded synthesis filter 29 consisting of cascaded lo...
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JP3476744B2 |
To allow an orthogonal channelizer to cope with many applications requiring different input data rates and an input channel group bandwidth. The orthogonal channelizer 20 receiving input and output sampling rates and an input channel gro...
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JP3476789B2 |
To provide a method and an apparatus for a data modulation in a CDMA system which is of high performance and which can make a communication installation compact, and to provide a method in which the distance between communication install...
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JP3475772B2 |
To make it possible to transmit non-speech signal of high quality without increasing a transmission speed at the time of transmitting a non-speech signal by changing over a part of processing function blocks based on the judgment result ...
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JP2003348023A |
To provide a method for reducing noise in a packet communication of a digital signal of audio or the like. Digital signals in a packet form including a plurality of digital words are received (400). Next, when part of continuous packets ...
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