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JP3264559B2 |
PURPOSE: To realize a multi-access/dual access function and a coding processing corresponding to high speed communication and high speed reading with simple configuration and control at a high speed and a buffer memory of a small capacit...
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JP3263881B2 |
PURPOSE: To prevent pre-echo generation with a fixed block length while using a spectral transformation processing with high encoding efficiency. CONSTITUTION: To input signal waveforms (A), the rectification window function of (B) is mu...
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JP3263797B2 |
PURPOSE: To effectively utilize a characteristic of a transmission line and to improve an amplitude characteristic by executing noise shaping so as to suppress a requantizing noise by an audio frequency band, at the time of requantizing ...
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JP2002507095A |
A communication device is provided having a speech encoder and a speech decoder and being able to retrieve and store voice messages in a memory. The messages are stored in the memory according to a message format. This format is more com...
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JP3263582B2 |
To forward the transmission start time of encoding information by simultaneously transmitting decoding tool information and encoding information unless a decoding tool required by a transmission side exists at a decoding device of a rece...
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JP2002062882A |
To minimize data distributed from a data distribution side to a user so that the user can obtain small-capacity music data from the data distribution side and further to obtain music data of complete sound quality without wasting the obt...
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JP3259759B2 |
To improve the tone quality of the background noises in a silence interval for the voice coding decoding system which has voice coding and decoding devices and executes the voice operated transmitter (VOX) process that generates backgrou...
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JP3259359B2 |
PURPOSE: To obtain a data reproduction device capable of correcting burst error by forming error flags with a demodulation means and correcting the errors of a data employing the error flags with an error correcting means. CONSTITUTION: ...
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JP2002055700A |
To provide a system for encoding and decoding a sound signal for maintaining reproduced sound quality by reducing a LPC (linear predective coding) coefficient which requires the largest amount of information.The system has an encoding pa...
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JP3258022B2 |
A data frame structure for a digital information signal comprises a first fixed number of repetitive data segments each containing a second fixed number of M-level symbols representing a plurality of data bytes and a data segment sync ch...
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JP3257534B2 |
To increase the number of error detectable bits whose number of redundant bits is fixed and to suppress deterioration of quality when many error continuously take place in an unprotected bit. A coupled circuit 4 inserts M unprotected bit...
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JP2002051016A |
To obtain a wireless receiver that can realize lower power consumption for a demodulation circuit and the entire wireless receiver without placing a limit onto a sampling rate.The wireless receiver is provided with an RF/IF circuit 1 tha...
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JP3255047B2 |
To generate a compressibility changed code string at a high speed. When further regenerating the compressibility changed code string from a temporarily generated code string, at a quantizing accuracy normalizing coefficient determining c...
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JP2002043981A |
To provide a communication apparatus that decreases errors in digital data so as to improve the reception quality even when the total power of a received path is decreased.A wireless receiving unit 101 converts a signal received by an an...
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JP2002041037A |
To provide an encoding method of sound signals which can make a same impression as that of the sound reproduced with multi frequency spectrum full band when people hear that, although when proper numbers (about 16 kinds), which can be re...
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JP2002044670A |
To obtain a decoding image signal by performing a decoding operation while an encoding image signal is being transcoded.The transcoding apparatus is provided with a transcoding part 21 to which a digital encoding image signal is input so...
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JP2002503403A |
(57) [Summary] An improved coding system for digital compression that can be used as a digital compression algorithm to increase the bandwidth of telecommunications and broadcast networks (Figure 1). This system operates in the transmiss...
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JP3252029B2 |
PURPOSE: To carry out the cyclic coding processing in the minimum step number. CONSTITUTION: The most significant bit of the coded data stored in a register 101 is stored in a flag 130. When the flag value is equal to 1, an exclusive OR ...
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JP2002026742A |
To enhance decoding method, when the decoding method of information subjected to turbo coding does not converge.First information with a set of initial weights is received from a demodulator input and fed to a turbo decoder 70. The decod...
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JP2002023794A |
To make natural sound highly compressible keeping high quality, and transmit it with good efficiency.A spectrum conversion means 2 samples PCM original sound of PCM sound source speech data at a prescribed rate, and divides them into the...
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JP3249012B2 |
PURPOSE: To provide a voice coding device in which low bit rate processing and voice signal processing are realized on a piece of DSP. CONSTITUTION: The coder of the device is provided with a TC input buffer 1 which stores voice input si...
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JP3248162B2 |
PURPOSE: To reduce the arithmetic quantity of the band synthesis filter by providing an orthogonal transformation section generating a 2N-degree vector from N-sets of division data, 1st and 2nd memory sections generating a 2MN- degree ve...
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JP3248807B2 |
PURPOSE: To form the transmission/reception system in which much more information at the same frequency band is sent by solving it that the impossibility of transmission information quantity cannot be increased when a frequency band is l...
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JP3249457B2 |
To reproduce a signal more accurately by correcting an error of a signal in a voice decoder, without aborting the whole signal frame for a bit error of a signal that takes are produced normally. A voice coding section 9 consisting of a v...
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JP3249280B2 |
PURPOSE: To provide an interleave circuit for conducting plural kinds of interleaves with small scale. CONSTITUTION: This circuit is provided with a first setting means 13 for setting a first set value M as a numerical value correspondin...
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JP3248719B2 |
A pulse code modulation circuit comprises a circuit for converting an input analog signal into a digital signal; processing circuit including a plurality of memories, each of which is a memory whose contents can be freely rewritten, for ...
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JP2002016943A |
To provide an apparatus for displaying an image capable of forming pallet data without using a color image memory and a histogram memory, reducing a calculating amount and conducting a natural image display.This apparatus for displaying ...
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JP2002014697A |
To prevent the occurrence of tone quality deterioration while decoding coded digital audio data and again coding the data.The audio decoder (11) of the digital audio device (1) decodes coded digital audio data, obtains coded parameters i...
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JP2002016554A |
To provide a coding processing system that can carry out coding processing at a high speed.A 1st bit calculating section 5 calculates a coding state value corresponding to an arbitrary 1-bit of input data, on the basis of a code stream. ...
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JP2002016779A |
To provide an information communication method and its unit that can select a coding mode providing the least data quantity to an expansion capability of an opposite device in the case of transmission and transmits data coded in the sele...
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JP2002016555A |
To provide an audio stream hierarchizing method that can reproduce an audio signal that is being received at the same time, while receiving and recording audio stream at a high rate, even through a transmission channel at a low rate.A hi...
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JP3246552B2 |
To obtain excellent frame elimination without eliminating voice frames having no error by comparing a forward composite symbol sequence that is convolution-decoded with a reverse composite symbol sequence that is subject to time inversio...
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JP3246029B2 |
PURPOSE: To reduce an arithmetic amount and to efficiently provide the approximate value of a desired correct solution without generating malfunction. CONSTITUTION: In the case of performing numerical conversion from a linear predictive ...
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JP3245345B2 |
To multiplex and transmit plural kinds of signals through the use of a signal digital line by judging the kind of the signal received by means of the kind of an error detecting code which is given to the signal received from a communicat...
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JP2002501693A |
A system transmits digital information bits, which are encoded into a predefined number of signed symbols per frame from a transmitter (40) over a network (46) to a receiver, wherein the transmitted signed symbols have a desired spectral...
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JP3245618B2 |
An apparatus adaptable for use with an analog-digital-analog conversion device for effecting communications between an analog device and a digital device, the analog-digital-analog conversion device converting incoming analog signals rec...
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JP2002006891A |
To estimate an error pattern of a reception ADPCM code to correct the error at the time when a click noise is included in the reception code.A device for improving a sound signal quality is provided with a click noise detection circuit (...
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JP2002009734A |
To provide a communication system adopting the OFDM system where a reception characteristics of a receiver side is not largely deteriorated even on the occurrence of a Doppler shift in a transmitted signal due to movement of a mobile sta...
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JP2002006890A |
To provide a device for improving a sound signal quality, which discriminates the radio environment of a signal transmission line to detect a click noise and improves the quality of the sound signal.The device is provided with a click no...
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JP2002006893A |
To provide a sound signal encoding method which reproduces a sound signal including a voice and performs decoding in accordance with the processing capability on the decoding side.Plural analysis sections are defined for a digital sound ...
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JP2002009883A |
To provide a data transfer system for automatically switching the error correction method by using a specific index to the error due to a transmission error of communication data that is caused in a communication network system.When an A...
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JP2002500472A |
A transmitter in an analog pulse code modulation (PCM) modem (12) which transmits analog levels over an analog channel (18) to produce constellation points at a quantization device (26), wherein the constellation points correspond to gro...
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JP2002500832A |
(57) [Summary] Ultrashort pulse time hopping code division multiple access (CDMA) and time division multiple access (TDMA) RF, IR, and optical communication systems (20,30) in the time frequency domain (60) are in the femtosecond to micr...
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JP2002500458A |
A device and method for detecting digital impairments affecting an upstream pulse code modulation (PCM) channel in a digital communication network, involves; receiving, by a digital PCM modem interconnected to the digital communication n...
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JP3243428B2 |
To provide a communication system provided with the wireless digital data link of high reliability by making a rotator be present inside a transmitter and compensating the pass band generation of low If signals. Inside this receiver, rec...
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JP3244772B2 |
PURPOSE: To compensate a valid transmitter signal depending on the transfer function of a coupled filter by filtering a transmitter signal, and constituting a whole transfer function of the inverted value of a transfer function converted...
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JP3244399B2 |
PURPOSE: To simplify rate revision circuit and to reduce the processing delay by segmenting a variable code whose data length changes depending on a bit rate from a bit stream, applying bit rate revision processing thereto and replacing ...
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JP3243990B2 |
To correctly perform a decoding even when the packets of digital broadcasting signals are repeatedly recorded/reproduced between different devices. A header imparting circuit 18 imparts and sets a flag for PCR (program clock reference) d...
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JP2001358799A |
To appropriately encode data and to transmit the data by taking data reproduction capability and storage capacity at a receiving side into consideration.In this data transmission system where a video transmitter 1 and a video reproducing...
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JP2001358668A |
To provide a receiving apparatus by which a receiving system in the best reception state is selected in shortest time, after the power supply of the receiving apparatus is turned on, and which can reproduce received information by digita...
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