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JP2001520480A |
A technique for maintaining a predefined transmission quality in a wireless Metropolitan Area Network (MAN). Each of a plurality of Local Area Networks are coupled to a corresponding router. Each router is coupled to one or more transcei...
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JP3223491B2 |
PURPOSE: To send out an audio signal of high quality in real time without spoiling the quality of the sent audio data when the audio signal is sent out by effectively utilizing characteristics of a transmission line having the good frequ...
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JP3224130B2 |
PCT No. PCT/US91/02512 Sec. 371 Date Dec. 11, 1991 Sec. 102(e) Date Dec. 11, 1991 PCT Filed Apr. 12, 1991 PCT Pub. No. WO91/16769 PCT Pub. Date Oct. 31, 1991.The invention relates in general to high-quality low bit-rate digital transform...
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JP3223043B2 |
PURPOSE: To improve motion vector detection capacity for a large motion and picture quality by changing the range of detection of a motion vector corresponding to picture size and an encoded frame interval after skip. CONSTITUTION: A ski...
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JP3223966B2 |
To provide a sound encoding device which reduces a sense of incompatibility of the background noise that is produced at the time of silence. In this sound encoding device, a vocal sound and silence discriminating part 1 discriminates an ...
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JP2001296900A |
To provide a voice signal coding decoding system by which treating quantity and bit rate are reduced without deteriorating reproduction voice quality by eliminating calculation of strength information on each band in an MELP vocoder bein...
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JP2001298743A |
To provide a method that reuses a preceding bit stream encoded from a still picture without the need for encoding frames having no change as to the picture in the frames. This method encodes only a different area of preceding frames and ...
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JP3222226B2 |
PURPOSE: To provide a waveform transmission system in which a noise generated, at the time of a decoding start can be effectively reduced even in the period of a pull-out during a transmission and reception. CONSTITUTION: The waveform tr...
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JP3221233B2 |
PURPOSE: To prevent the degradation in accoustic sound quality caused by converting ADPCM codes without errors inside frames when transmission errors are detected inside the frames. CONSTITUTION: In the case of detecting the transmission...
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JP3222130B2 |
PCT No. PCT/EP90/01683 Sec. 371 Date Aug. 24, 1992 Sec. 102(e) Date Aug. 24, 1992 PCT Filed Oct. 8, 1990 PCT Pub. No. WO91/05412 PCT Pub. Date Apr. 18, 1991.The process disclosed enables the "time domain aliasing cancellation" method to ...
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JP3221478B2 |
To prevent abnormal sound from being caused even on the occurrence of a code error. Input signal vectors are rearranged by an interleave section 11, divided by a vector division section 12, quantized by vector quantization sections 13-1 ...
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JP3220321B2 |
PURPOSE: To estimate the quality of a transmission line fast with high precision in the case of interference by detecting samples consisting of code sequences indicating a specific difference and counting the samples only when there is a...
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JP3221820B2 |
To prevent reduction in a multiplex gain and to decrease the number of transmission lines for a control signal by providing a monitor signal multiplex section and a monitor signal demultiplex section to a DCME so as to provide a cross co...
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JP2001292124A |
To inform a user of a cause that broadcast cannot be received in the reception device of an OFDM signal, which is only for differential demodulation. An OFDM receiver 1 is a receiver only for differential demodulation, which corresponds ...
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JP2001292438A |
To provide a 2-way communication method that serves individual data to be served to a customer according to customer's information for each customer without the need for the customer for its selection. This invention provides the 2-way c...
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JP3219762B2 |
PCT No. PCT/EP90/01661 Sec. 371 Date Aug. 24, 1992 Sec. 102(e) Date Aug. 24, 1992 PCT Filed Oct. 4, 1990 PCT Pub. No. WO91/05411 PCT Pub. Date Apr. 18, 1991.A method of transmitting an analog signal including the steps of converting the ...
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JP3219169B2 |
PURPOSE: To provide a digital audio signal processing unit by which deterioration in audio quality due to an error added on a transmission line is surely prevented. CONSTITUTION: A difference comparator signal (k) from an absolute value ...
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JP2001285066A |
To obtain an output signal maintaining linearity with an input signal, even when the input signal has a large dynamic range and to also suppress an error small in the case of quantizing the input signal. A/D converters 102-1 to 102-N qua...
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JP3217063B2 |
A priority assignment method and device are set forth for assigning a priority to a selected speech frame coded by a linear predictive coder based on at least two of: an energy of the speech frame, a log spectral distance between a frame...
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JP3216319B2 |
PURPOSE: To obtain digital audio transmitting and receiving devices whereby a circuit scale is made to be small by unifying the sampling frequency of an encoding system with different sampling frequencies. CONSTITUTION: At the time of tr...
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JP3215767B2 |
PURPOSE: To adopt one proper voice coding system in two kinds of voice coding systems in the communication between nodes in the case of building components of the network. CONSTITUTION: The network system is provided with one set of 1st ...
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JP2001272996A |
To provide a method for decoding an encoded stream obtained by overlap-encoding an audio signal by using a window function. In a method for decoding an audio-encoded stream, in the case of decoding it by overlapping audio frames, a sum o...
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JP2001272999A |
To provide a device for improving encoding quality at a same bit rate in a CELP encoding device relating to CELP encoding. The speech signal encoding device comprises a linear prediction analysis means 11 for coding an input signal by li...
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JP3214136B2 |
PURPOSE: To make it possible to record and reproduce without hindrance through a sample frequency can not be divided by the frequency of a record reference signal, for instance, a video field frequency, by providing each specified number...
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JP3214249B2 |
PURPOSE: To realize encoding and decoding with high quality with few errors, where an individual input waveshape vector is faithfully reflected by a small storing quantity of a code book. CONSTITUTION: In an encoding and decoding system ...
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JP2001268019A |
To provide an adaptive coding system for a mobile body that can reduce a decoding time at a receiver side more than in a conventional adaptive coding system and conducts adaptive coding by taking a speed of the mobile body into account.T...
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JP3211832B2 |
PCT No. PCT/FR93/00165 Sec. 371 Date Oct. 19, 1993 Sec. 102(e) Date Oct. 19, 1993 PCT Filed Feb. 18, 1993 PCT Pub. No. WO93/17508 PCT Pub. Date Sep. 2, 1993.A method and a system for processing digital audio signal preechoes. Samples x(n...
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JP3211771B2 |
To provide a sound transmitter-receiver which improves detection capability when transmission data is destroyed, etc., enhances the reliability of sound data reception, also improves a receiving sound quality characteristic and controls ...
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JP2001516162A |
A method and circuit arrangement for transmission of messages in which a number of L components (m0, . . . , mL-1) are coded by means of orthogonal functions to a signal (s(t)), and in which approximations of hermitic functions are used ...
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JP2001516171A |
Auxiliary data is carried substantially imperceptibly with video transform data in combined transform samples according to a visibility threshold. The auxiliary data provides a capability for a copy protect scheme or verification of tele...
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JP2001257597A |
To provide a data reception device and a transmission device, which reduce the deterioration of data due to the repetition of compression/non- compression conversion.A data reception device 105 that a repeating station 104 has converts i...
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JP3208629B2 |
PURPOSE: To prevent the degradation of sound quality due to the repeating of the encoding and the decoding in the case of a tandem connection, etc., regarding the data switch control system at the time of a repeater exchange. CONSTITUTIO...
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JP3210168B2 |
PURPOSE: To increase the number of participated speech channels by setting charging of speech based on the congestion degree of a speech channel and a maximum transmission rate of voice information and providing a means designating the m...
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JP2001249680A |
To shorten a signal processing time and reduce deterioration in voice recognition performance at the time of voice-recognizing a code signal.A speech codec is provided with an acoustic parameter conversion means 11, and a conversion from...
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JP2001249700A |
To suppress the deterioration of communication quality when an effect voice signal is not contained.A voice encoding device provided with a transmission side weighted filter means for obtaining a weighted difference signal by weighting, ...
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JP2001249691A |
To reduce a transmission rate while keeping communication quality.This voice encoding device comprises a selection signal generating means for varying a state of a selection signal according to a quantized control signal corresponding to...
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JP3207040B2 |
PURPOSE: To provide a radio communication equipment with which a user can select a low power consumption mode. CONSTITUTION: A radio communication equipment is provided with a variable rate sound codec means 3 which codes the sounds at t...
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JP3206497B2 |
To reduce the probability to generate different sounds by the dissidence of the code books of an encoder and a decoder by reforming an adaptive code width by an excitation signal forming means from the past index information of a certain...
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JP3207281B2 |
PURPOSE: To prevent a sound image from flickering even at the time of double talk by performing stereo sound transmission at the time of double talk and performing monaural transmission only at the time of a single utterance. CONSTITUTIO...
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JP3207284B2 |
PURPOSE: To suppress fluctuation of a sound image even in the case of simultaneous utterance by plural parties by using a 1st coding/ decoding means on the occurrence of simultaneous utterance of plural parties and using a 2nd coding/ de...
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JP3204287B2 |
PURPOSE: To provide a noise burst detecting method and a signal processor having a noise burst detecting function. CONSTITUTION: Such a signal processor as the ADPCM decoder receives input signals. An inverse adaptive quantizer 41 proces...
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JP3204581B2 |
PURPOSE: To quantize an excited gain in a coder of a voice using an analytic technique by a synthesizing means. CONSTITUTION: An optimal excited signal to each sub-frame is decided in a voice coder based on an analytic technique and oper...
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JP2001237780A |
To realize a radio voice system capable of holding voice delay to be very short, in order to realize natural conversation with high quality.A signal or plural voice frames are respectively displaced with corresponding voice half frames, ...
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JP2001513225A |
An audio equivalent input signal is divided into a sequence of overlapping or adjacent signal segments. A lengthened signal is synthesized by systematically maintaining or repeating respective signal segments of the sequence of segments....
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JP3201709B2 |
PURPOSE: To freely select a title at an optional time by selecting a desired specific image sound information and distributing the information to a reproducing device. CONSTITUTION: An access control instruction in the unit of sectors is...
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JP2001228898A |
To provide a better method and device coding of acoustic waves, more particularly coding of the speeches of a low data speed.Rapidly changing speeds are fixed so as to synchronize with the phase of the fundamental wave.
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JP2001228900A |
To provide a speech parameter quantization method, with which the quantization at a relatively small number of bit and the reduction of a memory quantity are possible.When a digital input signal is inputted (S1), the input signal is divi...
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JP3201136B2 |
PURPOSE: To reduce a consumption power properly based on the sense of hearing of a user corresponding to the sound state and the soundless state at the side of the transmission and the reception. CONSTITUTION: Based on the level of the o...
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JP3199582B2 |
PURPOSE: To prevent disable reception of succeeding dial information due to a one-link relay state of a caller by allowing a relay station taking one-link relay state to use a relay exchange so as to receive a part of dial information an...
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JP3199715B2 |
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