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JP3608380B2 |
To suppress deterioration of the voice quality even when the communication of voice data is performed via plural data networks, by preparing a coding system selection control means among the data networks to secure the negotiation with o...
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JP3609862B2 |
In a circuit arrangement for the analog/digital conversion of frequency-modulated intermediate-frequency signals and for converting them down to the baseband, the intermediate-frequency signals can be supplied to a sample-and-hold circui...
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JP3606903B2 |
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JP3606453B2 |
To improve compressibility, when a multichannel voice signal is predictively encoded, taking into consideration the fact that higher-order bit data for respective channels of a multichannel voice signal has high correlation and lower-ord...
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JP3606448B2 |
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JP3606446B2 |
To provide a digital voice transmitting device using a real time voice coding device. A voice coding device has switching control means 21 and 22 which output signals by switching the outputs of a spare coding means 18 and a currently us...
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JP3603470B2 |
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JP3603469B2 |
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JP3604034B2 |
To transmit sound data whereby decoding on the regeneration side can be adequately performed when compression encoding is performed on multichannel sound signals. An audio data area in an audio packet is constituted of a plurality of PPC...
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JP3600707B2 |
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JP3602934B2 |
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JP3601473B2 |
Digital audio data of one phrase are divided into frames, wherein each frame is divided into thirty-six sub-frames and is further divided into sub-band data of thirty-two sub-bands. The digital audio data are compressed in accordance wit...
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JP2004350077A |
To provide an analog audio signal transmitter capable of efficiently applying band extension technology of an analog audio signal to analog audio transmission processing.The analog audio signal transmitter 200a is provided with a carrier...
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JP3596978B2 |
To provide a technology of reducing noise in the voice data reproduction based on compressed data. The device is provided with an error detection means 19 detecting an error included in voice data before the expansion of the compressed v...
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JP3596841B2 |
A reception data expander includes: an adaptive differential pulse code modulation (ADPCM) decoder (3) activated when error detection information (102) attains a reception data error nondetected state for expanding an input ADPCM code (1...
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JP3594514B2 |
To provide a portable information terminal having a simplified voice encoding program capable of quickly performing voice processing. This terminal consists of a buffer defining means 240, which defines a buffer used as a current buffer ...
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JP3593741B2 |
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JP3593183B2 |
PURPOSE: To improve a problem of a pseudo background noise for a silence interval of receiver side causing unnatural sound quality when a sound detection flag is outputted by mistake for the silence interval from the sender side in the r...
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JP3593558B2 |
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JP3592356B2 |
System for digital transmission of left and right stereo signals and a center signal through left and right stereo channels and an auxiliary channel, respectively. In order to substantially reduce the extra bandwidth necessary to transmi...
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JP3593691B2 |
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JP2004325633A |
To perform on/off control over mid-side stereophonic encoding or intensity stereoscopic encoding with high precision in order to generate stereophonic encoded data of improved sound quality.A flow of on/off control over mid-side stereoph...
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JP3591451B2 |
To provide a data processing unit the versatility of which is enhanced. A peak hold/time attenuation circuit 3 generates envelope data De denoting a level of input data Din. A data separation circuit 4 separates the envelope data De into...
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JP3588679B2 |
An information providing apparatus identifies a transmission enabled band of a transmission line and selects information conforming to the band, thereby effectively utilizing the transmission band of the transmission line. The apparatus ...
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JP3586123B2 |
When there is an error in setting of a companding law of an encoder or a decoder, there is a problem of an error in judgment although it should be originally judged that the continuity of the testing channel does not exist. Therefore, a ...
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JP3588462B2 |
At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points ar...
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JP3585971B2 |
PURPOSE: To prevent pseudo synchronization even when a signal having the same period as a synchronization bit string is received. CONSTITUTION: A noise component addition means 5 adds a noise component to an input voice signal. Thus, eve...
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JP3586037B2 |
To enable a range process which sets a maximum gain reduction quantity by the expander device which employs an acoustic digital signal process. An absolute value converting circuit 2 converts the absolute value of an inputted acoustic di...
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JP3588463B2 |
A COMMUNICATION SYSTEM COMPRISING AN INPUT SECTION FOR INPUTTING AN IMAGE SIGNAL; AN IMAGE COMPRESSION SECTION(401) FOR COMPRESSING THE IMAGE SIGNAL TO GENERATE A DIGITAL IMAGE COMPRESSION SIGNAL; AN ERROR CORRECTION ENCODING SECTION(744...
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JP3583551B2 |
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JP3583550B2 |
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JP3583945B2 |
To improve the quantization efficiency at a low bit rate. A linear predictive reverse filter obtains the residue signal of an input voice, the residue signal is segmented by a pitch cycle and shifted in phase into PW so that the correlat...
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JP3580833B2 |
PURPOSE: To provide a pulse code modulation value generation circuit which is provided with a memory for pulse code modulation value to be generated and has high cost performance making the number of necessary constitution elements and t...
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JP3580906B2 |
PURPOSE: To reduce the abnormal change of the false background noise outputted to a silent section at the time when the level of the background noise as the last frame of a sound section is quickly changed by disturbance or the like with...
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JP3582693B2 |
To reduce a bit rate without degrading the voice quality so much by constituting respective noise component vectors constituting a noise code book with pulses of unit amplitude of not larger than specific values every subframe and determ...
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JP3580485B2 |
To quicken the convergence of the whole iteration loop. Of this audio signal encoding method having a time-frequency conversion step 11, an auditory model step 12, a quantizing and encoding step 13, and a bit streaming step 14, the quant...
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JP3579276B2 |
To achieve speech encoding of speech quality by using an algebraic structure code book which is decreased in the number of pulse positions and pulses by lowering a rate. When a speech signal is encoded by expressing it by information pre...
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JP3580444B2 |
PURPOSE: To improve sound quality by substantially using a compact disk being a fixed bit rate as a variable bit rate. CONSTITUTION: One sample is expressed by a fixed length of 16 bits, and data are substantially expressed by high-order...
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JP3578461B2 |
PCT No. PCT/DE95/00997 Sec. 371 Date Jan. 31, 1997 Sec. 102(e) Date Jan. 31, 1997 PCT Filed Aug. 1, 1995 PCT Pub. No. WO96/04653 PCT Pub. Date Feb. 15, 1996In order to improve the transmission quality of block-coded audio signals in audi...
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JP3576208B2 |
PURPOSE:To obtain the data compression device with bit rate changeover function by a DSP and its method in which one DSP copes with three kinds of bit rate and plural input and output channels are supported. CONSTITUTION:A 1st changeover...
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JP3576935B2 |
A device and a method for compressing signal information by removing (thinning out) the signal component of a signal in a specific frequency band. Firstly, an input time-series signal (e.g., a PCM signal) is converted by an analyzer ( 11...
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JP3576941B2 |
An analyzer transforms a digital signal into a spectrum representing the digital signal. A spectrum analyzing unit specifies a predetermined number of sets of the bands in decreasing order of the correlation between the spectrum distribu...
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JP3576909B2 |
The method involves modulating encoded data in blocks onto several carrier frequencies in one or more frequency bands using an orthogonal frequency multiplex method and transmitting a corresp. signal produced by inverse Fourier transform...
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JP3576589B2 |
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JP2004282612A |
To provide a data processor which can realize various sampling frequency conversion with a simple constitution.In up-sampling circuits 10, 11, a PCM (pulse code modulation) signal SI is up-sampled by 128 times. On the basis of a sampling...
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JP3572817B2 |
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JP3572769B2 |
A method and apparatus for determining an interpolated value for an audio data error sample included within a plurality of audio data samples. The audio data error sample may be replaced with the determined interpolated value so as to co...
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JP3575100B2 |
PURPOSE: To make this method in common to a method for transmission in the time division multiplex system by replacing time information of a data packet subjected to time compression with time information for re-stamping, modulating the ...
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JP2004274764A |
To provide an UWB (Ultra Wide Band) pulse string generating apparatus and a method, and the data transmitter-receiver apparatus using its pulse string and a method.The data transmitter-receiver comprises a random number generation part, ...
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JP3571068B2 |
Along with an audio signal (T), an auxiliary signal (AUX) is intended to be transmitted which cannot be separated from the audio signal, is inaudible on reproduction and does not impair sound reproduction quality. The audio signal is div...
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