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JP2003188840A |
To provide a channelizer for recovering many communication channels at the same time without the need for using a sub-band tuner in duplicate.The channelizer (224) comprises an n-point discrete Fourier transform (DFT) circuit (208) coupl...
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JP2003189301A |
To provide an image transmission system that necessitates only a set of an encoder and a decoder to transmit a moving picture, a quasi-moving picture and a still picture, thereby reducing the installation area and the cost of the entire ...
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JP2003520481A |
A transmitter is disclosed for transmitting a transmission signal via a transmission medium. The transmitter derives a prediction signal from the digital information signal in dependence on an array of prediction filter coefficients. The...
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JP3422012B2 |
To improve error correction possibility in the decoding of plural code groups. In branch metric operation circuits 43 and 44, humming distances corresponding to respective input data on first code groups inputted by input terminals 41 an...
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JP3421726B2 |
PCT No. PCT/DE92/00869 Sec. 371 Date Dec. 15, 1994 Sec. 102(e) Date Dec. 15, 1994 PCT Filed Oct. 13, 1992 PCT Pub. No. WO93/09644 PCT Pub. Date May 13, 1993A method for reducing data during the transmission and/or storage of the digital ...
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JP3418976B2 |
PURPOSE: To prevent the output of synthetic sound whose level is large. CONSTITUTION: Whether or not the level of sound signals synthesized based on a linear predictive coefficient by a linear prediction device 11 exceeds a prescribed th...
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JP3420250B2 |
In a method of coding discrete time signals (X1) sampled with a first sampling rate, second time signals (x2) are generated using the first time signals having a bandwidth corresponding to a second sampling rate, with the second sampling...
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JP3417362B2 |
To improve reproduced sound quality against a background noise sound in a sound signal decoding device in which a sound signal generated by driving a filter, which is constituted of a linear prediction coefficient, by an excitation signa...
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JP3415693B2 |
PURPOSE: To efficiently interleave or de-interleave data. CONSTITUTION: Input bits are distributed over nineteen transmission bursts in a GSM telephone. An arriving data unit is written in an adjacent RAM 228, and an output group is read...
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JP3415891B2 |
PURPOSE: To obtain a digital data sampling system which can avoid the occurrence of sampling errors caused by switching noise and hardly causes an unstable state. CONSTITUTION: A positive edge synchronizing circuit in a delay locked loop...
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JP2003163645A |
To provide radio communication equipment by which an analog signal of sound, a picture, etc., is digitized without using compression and extension technique accompanying A/D conversion and transmission of high quality picture lawful to a...
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JP2003163609A |
To provide a de-emphasis circuit capable of effectively performing de-emphasis in a 1-bit signal switching amplifier.A 1-bit amplifier 1 is provided with the de-emphasis circuit so as to de-emphasize signals after 1-bit signals f generat...
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JP3413691B2 |
PURPOSE: To perform an efficient encoding by making the shape of a forward conversion window function at the time of a forward spectrum conversion processing and the shape of an inverse conversion window function different. CONSTITUTION:...
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JP2003157097A |
To provide an inexpensive and high-performance coded voice decoder by a frequency time area conversion circuit carrying out an efficient arithmetic operation, of which hardware cost is reduced.The coded voice decoder is provided with an ...
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JP2003517748A |
Methods are provided for determining whether any slots of a modem frame are subject to robbed bit signaling (RBS), and whether the robbed bit signaling is beta-codec robbed bit signaling. From an obtained DIL sequence, an ordered table o...
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JP3410931B2 |
To provide a voice coding method capable of obtaining a high tone quality by performing a coding reflecting an abrupt change and a variability of pitch cycles. An LPC information 11 expressing the transmission characteristic of a synthet...
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JP3410077B2 |
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 a modulating part for performing modulation so as to pr...
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JP3410078B2 |
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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JP3410085B2 |
To provide a sending device for sending plural data strings having at least a first and second data strings, by modulation of plural carriers of which frequencies have the quadrature relation to each other. The second data string and the...
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JP3408342B2 |
PURPOSE: To change on to a different sampling frequency without causing racing even when phase relation is not established. CONSTITUTION: First data Din sampled by using first clock pulses CK1 are supplied. The first data are delayed in ...
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JP3408215B2 |
To minimize cell loss and cell transmission delay by improving the interleaving method of a cell header by transmitting the bits of a header field and first to (i-1) bits among (n) bits in an information field to the side of reception wh...
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JP2003140699A |
To provide a voice decoding device which can reduce the influence of a decoding error on a decoding process after recovery from a frame error if a frame error occurs during transmission as for a voice decoding device which receives encod...
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JP3404792B2 |
PURPOSE: To output correct data within an optimum time by applying proper muting or mute release in response to the operating mode. CONSTITUTION: A tuner 3 selects an RF signal of a band in RF signals subjected to frequency multiplex and...
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JP3404837B2 |
PURPOSE: To improve compressibility and to perform bit distribution among channels by detecting energy for each channel and performing encoding in which information quantity of each channel is allocated with a ratio in accordance with th...
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JP3406319B2 |
An apparatus and method for communicating data between at least two data devices, suitable for use as a wireless local-area network, that provides robust data communication via a radio communications channel corrupted by multipath interf...
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JP3404808B2 |
PURPOSE: To decode a played back or channel-switched video signal with short start-up delay. CONSTITUTION: A decoder 16, a pseudo decoder 21 which nullifies data accumulated in buffer memory, and buffer memory 12, 13 which receive a vide...
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JP2003134092A |
To distinguish a state of no signal and all '0' data in a frame transmitted by CRC check.A transmitter 1 inverts the logic of respective bits of CRC bits generated by a CRC generation part 11a by a bit inversion part 11b and transmits th...
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JP3404411B2 |
PURPOSE: To decrease the bit error rate of an output signal of a digital signal processing section by providing an expansion section to a digital signal processing section to compensate a nonlinear dynamic compression of an analog recept...
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JP3404350B2 |
To make a voiced-unvoiced decision resistant to frequency spectrum noise, and to synthesize unvoiced sound having less calculation complexity. A window length is adaptively adjusted according to a sound fundamental frequency by an adapti...
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JP3402483B2 |
PURPOSE: To efficiently encode audio signals. CONSTITUTION: In the case of performing the bit allocation of 100k bits to an MDCT coefficient (spectrum data) from an analysis part 34 at a bit allocation part 33, for example, first of all,...
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JP3404424B2 |
PURPOSE: To automatically make or interrupt a compression processing process by finding the scale factor of received sound signals by means of a signal analyzing circuit and supplying a switching variable relying upon the scale factor. C...
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JP3402680B2 |
PURPOSE: To provide the interleaving method and device for avoiding the problem of false synchronization. CONSTITUTION: Data, processed in a pseudo-random order by an interleaver 34 to make communication of a pseudo-random interleave dat...
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JP3399904B2 |
To provide an interleave address generator that can relieve a processing load for generating an interleave pattern in the case of generating a Prime interleave address. A memory address generator 12 generates a memory address, a multipli...
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JP3400064B2 |
PURPOSE: To obtain the flexible voice system utilizing merits of both of a complete stereo and a pseudo stereo by adding outputs of delay gain giving parts of right and left channels to enphasize the correlation component and obtaining t...
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JP3399017B2 |
PURPOSE: To provide the phase synchronizing device which is used in, for example, a direct conversion FM receiver to improve the phase comparison sensitivity. CONSTITUTION: A reception signal is converted to base band orthogonal signals ...
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JP3397246B2 |
PURPOSE: To inexpensively provide a small speech CODEC device capable of providing plural kinds of speech CODEC function. CONSTITUTION: An echo canceller arithmetic part 12 and a speech CODEC arithmetic part 15 are comprised of digital s...
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JP2003110609A |
To provide a communication apparatus for performing communication between user terminals and a network connection provider device to attain high-speed communication by means of short-cut communication among the user terminals.The communi...
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JP2003110534A |
To provide a system for improving the rate of successful messaging even on any carrier condition against noise.Data to be transmitted are encoded and formatted, a check sum (CSM) is determined concerning these encoded and formatted data,...
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JP2003513521A |
A signal of any physical form corresponding to an information character of an encoding alphabet, is transmitted as an analog waveform defining a symbol, the waveform being cyclical at the symbol rate, to a communication channel and then ...
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JP3395001B2 |
To improve encoding efficiency and sound quality by adaptively encoding an input digital audio signal consisting of plural frames. A delay circuit 130 stores a 1st signal-to-mask ratio of an i-th frame in a memory built in a delay circui...
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JP3394069B2 |
PURPOSE: To acquire an execution form in a CMOS by generating a prescribed output signal at the time of receiving a receiving pulse that has the same polarity or the opposite polarity to a 1st receiving pulse, following it. CONSTITUTION:...
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JP2003099096A |
To prevent the occurrence of abnormal sound even though a miss occurs in error detection.An audio decoding section 21 is used to decode spectrum data in a frame unit from audio coded data. In an error compensation section 23, a frame in ...
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JP2003099099A |
To provide an encoder/decoder for the subbands of signals representing multidimensional sound field.Signals encoded in multidimensional sound field are carried by multiple discrete signals and/or composite signals. Control signals convey...
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JP3390771B2 |
To obtain a small transmission signal envelope change and a phase change by generating first and second binary codes, making a pseudo noise(PN) binary code into a third binary code, generating a diffusion symbol, generating a quadrature ...
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JP2003091294A |
To solve the problem that allophone is generated and causes discomfort to a listener when a bit stream of erroneous MPEG audio is reproduced by an MPEG audio decoder.The speech decoder comprises an error detection part for inputting data...
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JP3390013B2 |
An encoder apparatus is disclosed for encoding a wideband digital information signal. The apparatus comprises an input signal (1) for receiving the wideband digital information signal, a signal splitting unit (2) for splitting the wideba...
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JP3387461B2 |
To improve the compression rate of sound signals when they are put into prediction codes. An adder computes a sum signal L+R of stereo two-channel signals L, R, while a subtractor computes the remainder signal L-R. Differences Δ(L+R), Î...
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JP3387086B2 |
To improve a compression rate when voice signals in a plurality of channels are subjected to predictive coding using the fact that the correlation among the upper bit data of each channel of voice signals of the plurality of channels is ...
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JP3387091B2 |
To improve a compression rate at the time of conducting predictive coding of voice signals. A five channel correlating circuit 1 converts five channel signals (L, C, R, SL and SR) into correlated five channel signals L and D1 to D4. Pred...
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JP3387837B2 |
To prevent the deterioration of digital information caused by transmission and to make a processor small in size and light in weight as a whole. The reproduced signal of an electromagnetic conversion system 14 is inputted to an error cor...
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