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JP3471355B2 |
A method and apparatus for differential coding of blocks of images includes coding the difference between a current block of an image to be transmitted and one of four blocks of the reconstructed current image in the closest vicinity of ...
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JP3472974B2 |
To maintain continuity between frames and enable prediction in the time region and filter processing. One frame (N points) of input samples is duplicated and every two N points are taken out (11) and applied with 2 N points of window fun...
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JP3472774B2 |
To provide a transmitter for transmitting a plurality of data streams by modulating a plurality of carriers in a frequency relation orthogonal to each other. When a first data stream is audio information and a second data stream is infor...
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JP3471779B2 |
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JP3468335B2 |
To precisely obtain the power envelope of MDCT coefficients. The sample series of acoustic signals are superimposed for every N samples and taken out for every 2N samples (12). Then, these samples are multiplied by a Hanning function win...
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JP2003533902A |
(57) [Summary] Communication system (10) uses a compression code with multiple parameters, including the first parameter, to transmit a near-terminated digital signal. This parameter represents one audio signal with multiple audio charac...
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JP3465401B2 |
PURPOSE: To perform transmission (recording and reproducing) using a ΣΔmodulation. CONSTITUTION: Input audio signals from an input terminal 1 are supplied to an integrator 3 through an adder 2. The signals from the integrator 3 are sup...
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JP3464440B2 |
To provide a system that transmits, receives, restores and reproduces the digitized sample of an analog signal. This system consists of a transmission subsystem which transmits the digitized sample through a communication medium and tran...
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JP3465697B2 |
To make it possible to use the recording capacity effectively by recording an efficiently compressed signal into a recording medium. Signals encoded are recorded in a signal recording medium by an encoding processing consisting of a conv...
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JP3462958B2 |
To compose a speech source code vector with fidelity to an input speech from a relatively small bit rate in a speech encoding system with a low bit rate of about 4kbits/sec. An adaptive code book searching circuit 17 generates an adaptiv...
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JP3462066B2 |
To ensure the permissible quality and to reduce the circuit scale. A subtractor 21 takes a difference between an input signal and a predicted signal from a prediction device 25, and a quantizer 22 quantizes the difference and provides an...
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JP2003309527A |
To provide a portable telephone which copes with damage of data during communication, thereby improving speech quality.The portable telephone performs, as types of processing performed on a received signal, base band processing, data exp...
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JP2003532327A |
The processor ( 24 ) retrieves from a memory ( 22 ) values of a signal recovered from received wireless signal and demultiplexes and de-interleaves them simultaneously. The system can be operated in reverse to produce a multiplexed, inte...
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JP3459417B2 |
A method for converting and encoding an analog signal to a digital format and subsequently decoding and converting said digital format to recover the analog signal, comprising the steps of monitoring the physical characteristics of an an...
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JP3459133B2 |
PURPOSE: To reduce calculation load more than usual in decoding of a non- erased frame in order to improve the problem of frame erasure for a CELP decoder. CONSTITUTION: Concerning a parameter signal adapter to be used for the decoder an...
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JP2003530579A |
In a system in which an auxiliary data signal is conveyed with a decoded audio signal to assist in re-encoding, signature information is provided to assist in detecting changes in the decoded audio signal which would render the auxiliary...
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JP3454407B2 |
To reduce peak power without increasing channels for parallel transmission independent of the static characteristic of an input signal by orthonormally converting N channels of modulation signals so as to reduce a mutual relation between...
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JP3454220B2 |
To provide a simple multicarrier synchronous detecting device which can estimate a channel with high precision even when the influence of thermal noise and multipath fading is large and is small in circuit scale. This circuit is provided...
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JP3453116B2 |
To code a voice pitch which is a voice coding parameter of analytico- synthetic type, vocal/silent information and amplitude of harmonics spectrum with a small number of bits. The voice pitch is quantized by switching a frame of logarith...
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JP3450788B2 |
To increase the effect of error correction decoding by effectively using data abandoned in a conventional case at the time of puncturing on a receiver side. In a puncturing part 102, an input memory 201 temporarily stores data inputted t...
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JP3451998B2 |
To reduce deterioration in decoded voice quality caused by discontinuity of a filter coefficient by decoding a characteristic parameter showing a spectrum envelope characteristic of a composite signal with a value smoothened in the time ...
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JP3451117B2 |
PURPOSE: To provide a discrete time signal processor which can obtain a clock signal having a desired frequency to begin with a single stable oscillator frequency and does not have the ratio of the oscillation frequency and clock frequen...
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JP2003273966A |
To provide a voice communication terminal which realizes it that a user feels no incompatibility in sound volume even when the user uses an external device to process an encoded voice signal processed by the voice communication terminal ...
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JP3449715B2 |
In an encoder, multiple channels of audio information representing multidimensional sound fields are split into subband signals and the subband signals in one or more subbands are combined to form composite signals. The composite signals...
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JP3449404B2 |
To reduce cost by effectively utilizing digital signal processing as many as possible so as to conduct various base band functions. This receiver has two channels for an in-phase component Iin and a quadrature component Qin of a received...
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JP3450321B2 |
To provide a transmission/reception system where much more information can be transmitted with the same frequency band by solving a problem that the transmission information quantity cannot be increased if the transmission frequency band...
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JP3450322B2 |
To provide a transmitter for transmitting a plurality of data streams by modulating a plurality of carriers whose frequencies are in an orthogonal relation to each other. The transmitter of this invention includes: a modulation section t...
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JP3445974B2 |
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JP2003527768A |
A method for profiling disparate communications and signal processing standards begins with selection of a set of standards for analysis (32). Next, functions performed by the set of standards are identified (34) and ranked (36). A set o...
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JP3444261B2 |
To prevent an exactly different voice signal from being reproduced owing to a transmission error. A conversion encoding circuit 2 generates conversion coefficients for each block of an input voice signal 1 by performing the orthogonal co...
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JP2003526254A |
Docket: D2459 A system and method for increasing the performance of a digital return path in a hybrid-fiber-coax television system using baseband serial optical transport, receives an analog composite return path waveform at a comparator...
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JP3439739B2 |
To provide a transmitter transmitting a plurality of data strings by modulating a plurality of carriers having mutually orthogonal frequency relation. A modulating part performing modulation so as to provide power difference between a ca...
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JP3439738B2 |
To provide a transmitter capable of transmitting a plurality of data strings by modulating a plurality of carriers having mutually orthogonal frequency relation. The transmitter has an error correction encoding part for applying error co...
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JP3436940B2 |
PURPOSE: To perform sufficient processing for a random error as well as a burst error by providing a threshold setting means which changes and sets a threshold with which ADPCM data is substituted by an error signal. CONSTITUTION: A thre...
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JP2003229822A |
To provide a method for stably and sequentially reproducing sequentially received audio signals even if a state in which data can not be received due to some reason occurs.A received signal reproducing device has a receiver 7 for receivi...
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JP2003223194A |
To naturally reproduce audio signals without sense of incongruity on acoustic feeling even though an error is generated in coded audio data and interpolation is conducted.Coded audio data obtained by an expanding processing conducted in ...
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JP3434260B2 |
To encode an input voice containing a tone component much in high area with high efficiency by dividing the frequency area coefficient of an input signal sample to generate a coefficient small piece group, classifying the coefficient sma...
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JP3433045B2 |
To compensate a loss in the continuity of sounds in the case of decoding and reproducing while eliminating the omission and error of transmission information caused by the degradation of communication quality by transmitting the encoded ...
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JP3433148B2 |
To attain measurements during connection to an active CDMA and to acquire a reception function by specifying a frame in future in relation to a 1st communication connection that is timely coincident with occurrence of signaling in future...
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JP2003217064A |
To reconcile simplification of a device and quickness of processing by quickly processing respective signals supplied from a plurality of sensor elements without using many telecommunications lines in a sensor signal processing unit and ...
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JP2003522982A |
A speech encoding system and method for encoding a speech data signal including a number of frames. The speech encoding system includes a speech data rate determinator and a number of speech data signal encoders. The speech data rate det...
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JP2003522981A |
An error concealment method is for improving the speech signal quality at the receiving end in speech transmission systems is described particularly, it relates to a method of receiving speech signals which have been encoded through spee...
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JP3432082B2 |
To prevent omission of code book gain information during frame disappearance in a sound decoder based on a code book by using a code book gain attenuated with a gain from a previous sound frame. A pitch delay M used by an adaptive code b...
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JP2003522440A |
A method and a receiver for processing a desired signal for decoding (i.e., by a decoder). In accordance with the method, an input signal that includes the desired signal and additional signals is received and filtered with a first filte...
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JP3428376B2 |
To provide a stable automatic equalization system capable of an necessitating the adjustment of a signal processing circuit, by respectively constituting a gain control loop, a phase locked loop and a waveform equalization loop with digi...
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JP2003522450A |
A sampling system includes an input terminal for receiving a data signal having a signal component and possibly a noise component. A sampler samples the data signal at a sample rate set in responsive to a control signal. A noise detector...
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JP2003204305A |
To reduce a periodic noise unique to a mobile communication terminal, superposed on a PCM voice codec from a transceiver, thereby realizing a good speech sound quality.The PCM voice codec 70 detects the time-division operation timing of ...
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JP2003204304A |
To reduce the noise by the compressing/decompressing process of FM signals and restrict the distortion of signals in an FM broadcast receiver.A compressing-expanding unit for compressing/decompressing a difference signal D(z) transmits a...
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JP3426191B2 |
To obtain a method and a device capable of simply substituting a circuit realized by miniaturized digital logic for a PLL circuit. In order to measure a pulse interval for encoding data information by utilizing a high frequency signal al...
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JP3427149B2 |
To shorten the time for initializing a storage means as required by storing data generated by an initial data generating means to the storage means in place of an output of a decode means. A synchronization state register 8 latches a syn...
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