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JP2002261703A |
To overcome the problem that, in a sampling converter, samples having no error periodically generate among sampling data after sampling conversion and are conspicuous.There is provided a means for setting sampling points after sampling c...
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JP2002530006A |
This invention relates to radio engineering, and in particular it concerns a method of establishing contact between users. The method consists in that, in a portable computerized device combined with a radio transceiver, data comprising ...
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JP2002529875A |
An arrangement for embedding supplemental data (e.g. a watermark W) in an information signal. In an embodiment of the invention, the arrangement comprises a conventional sigma-delta modulator for encoding an audio signal and modifying me...
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JP3323698B2 |
PURPOSE: To reduce the operation speed of a detection circuit part of a mobile station by performing averaging of the phase error, delay of reception data, and phase correction processing in a symbol rate unit. CONSTITUTION: An accumulat...
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JP3320749B2 |
The communications processor of the present invention comprises, in a single integrated circuit chip, the combination of a central processing unit (CPU-200)) having an execution unit (206) with an arithmetic logic unit and accumulators, ...
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JP2002247011A |
To improve an error correction characteristic as compared with a conventional method in the case of applying error correction technology to a space division multiplex communication receiver.The space division multiplex communication rece...
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JP2002246966A |
To provide radio communication equipment with which reception data with fewer errors are selected and outputted, even when the errors are detected in all data in a time diversity system.The data for one frame, which are the output of a t...
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JP2002246916A |
To provide an error-correction device which hardly deteriorates in redundancy, even if multivalued under is small.An error-correction device is equipped with an encoder and a decoder which correct errors by block units, a block generator...
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JP3319396B2 |
To provide a voice coder with which good sound quality can be obtd. even in a low bit rate. A mode is discriminated by using a characteristic quantity from an input speech signal for every sub-frame in a mode discrimination circuit 800 o...
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JP2002237785A |
To obtain a method for reducing band width quantity in transmission of a digitized voice packet.The number of packets to be transmitted is reduced by interrupting the transmission by determining a silent period or a period only with nois...
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JP2002238053A |
To provide a coder and a coding method that can minimize a side effect by emphasis processing and enhance the image quality of a reproduced image after decoding.The emphasis level is set by a quantization parameter in the coding of an in...
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JP3315956B2 |
A noise section detection unit (101) separates an input signal into a voice section and other sections to detect a signal in sections other than the voice section as a background noise. A noise level estimation unit (102) estimates a noi...
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JP2002232780A |
To allow decoding with efficiency with reducing a memory amount needed to decode.In a decoding apparatus of digital signal, when receiving a first and second MPEG streams, a MPEG decoder 1 develops the first MPEG stream to a first memory...
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JP3313564B2 |
To prevent deterioration in voice quality by controlling the maximum voice data rate when it is possible that accumulated control data transmission amount is crossing the minimum accumulated data transmission amount curve. A demultiplexe...
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JP3312635B2 |
PURPOSE: To provide a storage picture transmitter in which the movement of an important scene or resolution can be reproduced with a high quality even at the time of transmitting a picture by using a low speed digital line. CONSTITUTION:...
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JP2002524968A |
A precision timing generator system (400) suitable for ultra wide band (uwb) communications. A frame reference signal (432) is produced as a function of a clock signal. A first timing generator (404) generates a coarse timing signal havi...
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JP2002217840A |
To provide a method for optimizing the performance of a mobile radio system transmitter that uses processing operations which include discrete Fourier transform(DFT) calculation, filtering within a frequency domain, an inverse discrete F...
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JP3308758B2 |
PURPOSE: To exactly demodulate a transmission signal by demodulating a received signal to the digital signal of one bit corresponding to a regenerative clock signal by modulating the digital signal of one bit at a first exclusive OR gate...
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JP3310114B2 |
PURPOSE: To obtain characteristics of a low distortion rate and a low noise by inserting a first frequency converter to the main signal route of a loop and inserting a second frequency converter to the feedback signal route at a negative...
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JP3309201B2 |
To provide the data compression method and the data expansion method from which an optimum dynamic range and S/N are obtained. In the case of 14-12-bit instantaneous data compression from a 14-bit digital input signal representing an inp...
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JP3307875B2 |
To reduce the quantity of operation for reproducing voices while having a difference in the sound volume of voices between respective speakers and to reproduce the voices easy to listen to. In the case of voice reproduction due to a repr...
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JP3307483B2 |
PURPOSE: To provide a Hilbert converter which can especially reduce the distortions and also can attain an accurate and economical operation. CONSTITUTION: This digital wide band 90-degree phase shifter consists of an ST gDFT analyzing m...
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JP3307138B2 |
PURPOSE: To prevent deterioration in sound quality by controlling a gain for a signal before an attack part A and a signal of a release part B detected from a waveform signal by an amount in response to the waveform and correcting the si...
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JP3306797B2 |
To suppress the quantization error of the entirety, which becomes worse owing to the use of digital loss insertion technology for modem transmission on a digital network, through signal processing. The digital network 113 is connected be...
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JP3305152B2 |
PURPOSE: To reduce processing time relating to interleaving and inverse interleave processing by rearranging data with higher priority over a head correction unit of each block and head word data of each correction unit with highest prio...
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JP3304739B2 |
To provide a high-definition encoder having no degradation by operating a run length compressing operation due to division into plural sub-bands, reduction in the number of bits on the noise floor of linear PCM and the decision of a scal...
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JP3304717B2 |
PURPOSE: To easily realize the operation of the characteristic on a frequency axis for an input signal without the need for a new mechanism and device other than the mechanism and the device to compress information without giving hindran...
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JP3304632B2 |
PURPOSE: To extend spread interval of received data without increasing the circuit scale of a memory. CONSTITUTION: In the interleave system where two sets of memories 100, 200 are controlled in a way that reading of one memory and write...
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JP3303136B2 |
To provide a code division multiple parallel radio communication system, etc., using a cyclic expansion diffusion code. A transmitter 221 applies serial-parallel conversion to transmission signals, respectively performs spectrum spread o...
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JP3303098B2 |
PCT No. PCT/DE93/00845 Sec. 371 Date May 16, 1994 Sec. 102(e) Date May 16, 1994 PCT Filed Sep. 9, 1993 PCT Pub. No. WO94/07148 PCT Pub. Date Mar. 31, 1994.The present invention relates to a method for sampling an analog, periodic, measur...
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JP3302160B2 |
PURPOSE: To improve the quality of speech by preventing the occurrence of foreign sounds even in the case that the transmission line quality is too degraded to correct and detect an error. CONSTITUTION: In an error correction and decodin...
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JP2002198860A |
To provide a radio LAN capable of attaining a high data transmission speed without suffering adverse influences of the interference in multiplex channels.A data modulator 66 transforms input data into a Walsh function symbolic waveform, ...
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JP3298959B2 |
PURPOSE: To easily provide a pulse width modulating circuit by a simple constitution by adjusting a time difference generated between set and reset pulses generated at the same time difference by a unit pulse. CONSTITUTION: The pulse wid...
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JP3299952B2 |
To provide a digital signal branching filter and a digital signal multiplexer that are not affected by interference due to a loopback signal and by distortion due to a joint between filters. Let a sampling speed of an input signal to a 2...
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JP3300398B2 |
PURPOSE: To accurately propagate information to a remote place by using the property that the eigenvalue of a light wave corresponding to a propagation distance does not vary even if dispersion and nonlinearity are present on a propagati...
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JP3298188B2 |
PURPOSE: To provide a voice detection method which discriminates the presence and the absence of voice signals and is suitable to human hearing sensation. CONSTITUTION: Voice signals are inputted, spectra of the signals are computed at 1...
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JP3297238B2 |
PURPOSE: To improve the encoding efficiency and tone quality of an adaptive encoding system by encoding a plurality of frames of input digital audio signals by using a frame recognizing information quantity so that the encoded results ma...
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JP3296714B2 |
To provide a sampling the conversion device provided with the radio channel reception processor of a base station on PHS(second generation cordless telephone) with a small circuit scale. Sound data Di are written into different memories ...
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JP3297050B2 |
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to computationally efficient adaptive bit allocation and quantization of encoded in...
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JP3297240B2 |
PURPOSE: To improve the encoding efficiency and tone quality of an adaptive encoding system by encoding digital audio signals inputted from a plurality of channels. CONSTITUTION: Subband filters 11 and 12 input digital audio signals X1(m...
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JP3297051B2 |
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to computationally efficient adaptive bit allocation and quantization of encoded in...
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JP2002519927A |
A message in the form of a sequence of bits is encoded into relatively short, non-binary signals. The message (or vector) is divided into two halves. The encoder first determines an encoding of the message into a vector half the length o...
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JP2002519924A |
[Task] A system that produces accurate low noise period signals In the illustrated embodiment, the system according to the invention includes a low bit digital / analog converter (68) that converts a first signal with a reference frequen...
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JP3295174B2 |
PURPOSE: To provide a data receiving device which receives the data that are transmitted together with other information by means of radio waves and can evade such a case where the wrong bit that is recognized to be correct in an allowab...
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JP2002176395A |
To provide a filter of simple constitution with less distortion in an output waveform.A first arithmetic part 2-1 for which the S/H circuit of several stages for holding ΔΣ modulation signals and a processing circuit provided with an a...
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JP2002175097A |
To provide an encoding and compression, and a decoding and expanding device which can make the arithmetic processings of a decoding and expanding circuit for fewer than in the conventional device.An encoder 22 of the encoding and compres...
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JP2002517843A |
A system for communicating with plural remote transmitters in which the transmitters send messages without a common synchronization source or polling by a controlling receiver. In one embodiment, the system uses the time position of freq...
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JP2002517844A |
A system and method in which multiple remote transmitters communicate asynchronously with one or more receiving stations. The transmitters are low cost units which use inexpensive timing circuits to generate a pulse position encoded chir...
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JP2002517932A |
Apparatus, and an associated method, for generating a gain control signal for controlling operation of a variable gain amplifier. Gain control circuitry includes a delta sigma modulator which exhibits a noise transfer function for shifti...
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JP3292522B2 |
PURPOSE: To provide the speech decoder and speech encoder which can perform processing of speech data in plural series on a time-division basis. CONSTITUTION: The speech decoder and speech encoder are equipped with encoded speech data in...
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