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JP3571709B2 |
To enhance quality of speech when background noise such as outdoor noise is superposed in a digital mobile radio communication system such as a car telephone and a cellular telephone. A speech encoding device is provided with a noise sup...
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JP3572090B2 |
The transmission system includes a transmitter for transmitting a sub-band-coded signal which is accommodated in a second digital signal (FIG. 2) having frames which incorporate allocation information, scale factor information and sample...
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JP3570563B2 |
PURPOSE: To eliminate loopback distortion caused at the time of sampling of a signal. CONSTITUTION: An image formed by image pickup elements 31,32 is sampled spatially and the obtained sampling signal is interpolated into a sampling sign...
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JP3570941B2 |
mu-law-to-A-law translating equipment is used for plural PCM telephone lines installed between countries different in a conversion law. This translating equipment is provided with plural mu-law signal receiving circuits, a multiplexer, a...
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JP2004529345A |
A method and apparatus for increasing the potential digital bit data rate potential for communication-to-be-added to Loran-C radio-frequency pulse navigation transmitters and the like without affecting the navigation capability and integ...
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JP3567869B2 |
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JP3569303B2 |
A high definition video system processes a bitstream including high and low priority variable length coded Data words. The coded Data is separated into packed High Priority Data and packed Low Priority Data by means of respective data pa...
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JP3568255B2 |
PURPOSE: To improve the quality of a voice even when a background noise from outdoors or the like is superposed to the voice in a digital mobile radio communication system such as an automobile telephone system and a portable telephone s...
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JP3565545B2 |
To surely transfer data and to improve a sampling frequency converting error by mutually comparing the values of plural latched data signal and selecting one of plural data signals corresponding to the compared result. A latch array circ...
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JP3566652B2 |
A pitch search method and device for digitally encoding a wideband signal, in particular but not exclusively a speech signal, in view of transmitting, or storing, and synthesizing this wideband sound signal. The new method and device whi...
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JP3561923B2 |
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JP3563215B2 |
To restore a lost portion of a signal by estimating that portion based on the first known portion of the signal precedent to and the second known portion of the signal succeeding to the lost portion. A lost portion of a signal is restore...
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JP3564306B2 |
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JP3564144B2 |
A method and device for encoding a digital audio-signal divided into a succession of blocks according to a LPC "forward" and "backward" analysis respectively under a choice criterion. For coding each current block, the choice criterion i...
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JP3560964B2 |
To obtain a wide-band voice restoring device which restores a wide-band voice signal of high quality by estimating a stable wide-band sound source with a correct amplitude from narrow-band voices or narrow-band voice codes under less inf...
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JP3559488B2 |
To reduce the effects of a transmission error or packet loss by deforming an error spread over hierarchies, in bit rate scalable encoding and decoding, based on hierarchical quantization such as controlling of an amplitude. A signal, def...
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JP3557416B2 |
To provide an LSP parameter encoding and decoding device which can secure high quantum precision and increase the tolerance of an error even when an input voice signal is in a transient state. This device is equipped with a 1st quantizin...
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JP3556363B2 |
To attain efficient transmission by allowing a transmitter side to send contour blocks with error correction coding and to send non-contour blocks with error detection coding and allowing a receiver side to reproduce frames through inter...
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JP3554566B2 |
A sound decoder (10) has a decoding unit (11) and an amplification control unit (12). The decoding unit (11) decodes a received coded sound signal (bit stream) BS and outputs a decoded sound signal SP. The amplification control unit (12)...
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JP3555925B2 |
To estimate a lost parameter corresponding to the state of signals and to perform highly accurate parameter estimation. When a code error is detected in a communication path and the parameter mapped by a mapping device 101 is lost, the l...
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JP3552201B2 |
To obtain a voice coder in which coding distortion is made less noticeable even at a low bit rate. By windowing first autocorrelation coefficients, that are computed in an autocorrelation computing section 101 from inputted voice signals...
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JP3552619B2 |
To effectively use a line by automatically selecting sound encoding in accordance with the situation of line quality. In exchange devices A000, B100, C200 and D300, the line quality of a repeating line is detected and one of plural sound...
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JP3551806B2 |
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JP3552249B2 |
PURPOSE:To provide the system in which various decoding processing units make decoding by improving an existing MPEG. CONSTITUTION:The restriction of a buffering delay time 1sec specified in an existing MPEG is relaxed, and a buffering d...
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JP3552200B2 |
To provide high communication efficiency without the occurrence of an error in transmission contents by providing a voice extending means for outputting extended voice information and a voice output means for receiving synthetic voice ou...
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JP3549963B2 |
An inexpensive, compact digital radio receiver corrects IQ imbalance, non-orthogonal I and Q phases, and DC offset by a DSP. The digital radio receiver is equipped with an antenna, an RF/IF converter for converting a radio frequency into...
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JP3549516B2 |
To achieve an improved disparate error protection in the transmission of coded symbols of an information stream, the information stream is supplied to a multiplicity of coding branches for coding, and is supplied in parallel, to a punctu...
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JP2004215103A |
To provide an electronic camera which can prevent informational perturbations and protect private information not displaying others than required images, at the circulation to many, unspecified persons.An electronic camera comprises an i...
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JP3548882B2 |
To obtain a circuit about which high position accuracy is not demanded in the mounting of a switch element such as a diode to a transmission path by outputting a signal which is undergone specific phase modulation from a synthesizer acco...
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JP2004208112A |
To provide a radio communication system for performing radio communication in which the effect of multipath noise, etc., is appropriately eliminated.A transmitter 1 reads transmission object data from an information source 11, and a modu...
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JP2004522388A |
The present invention, relevant to a procedure for modulating/demodulating with code-select/code-division multiple access, provides a technique of code-division multiple-access, in which information channels in number of N+1 are assigned...
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JP2004207932A |
To provide a transmission-reception apparatus and a transmission-reception method for voice signals whereby excellent voice can be heard without deteriorating the S/N even when a voice volume level at a transmission output side is low.Th...
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JP2004208111A |
To provide a radio communication system for performing appropriate radio communication while reducing power consumption.A transmitter 1 reads a transmission object data from an information source 11, and a modulating part 12 and a pulse ...
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JP3546063B2 |
A turbo encoding device and method using recursive systematic component encoders (RSCs) with dummy bits insertion at positions of a data frame having a higher error occurrence probability. In particular, the invention uses the techniques...
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JP2004521569A |
A communication system (1) is described in a possible embodiment comprising a main transmitter (TR) having two or more series arrangements of at least a digital signal processor (6) and a down sampler (7) coupled to the band pass filter ...
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JP3541413B2 |
PURPOSE: To easily realize addition of dummy data with simple configuration when video data of a variable length is recorded on a recording medium and the dummy data are added to the video data to produce a fixed rate in order to be in m...
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JP3541342B2 |
To provide a sampling clock frequency information transmission system, capable of efficiently transmitting the frequency information of a sampling clock provided with a frequency different from a transmission clock by a small bit number....
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JPWO2002071389A1 |
An interpolation device that determines the sound status of the frame in which the error or loss occurred in the audio data and performs interpolation according to the status, the input section for inputting the audio data, and the error...
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JP2004519736A |
In a speech coding system with a speech encoder and a speech decoder cooperating with said speech encoder, the speech encoder comprises a pre-processor and an ADPCM (adaptive differential pulse code modulation) encoder with a quantizer a...
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JP2004519917A |
A frequency synthesizer is provided that allows for a half-cycle division of the synthesized frequency. In a conventional sigma-delta fractional-N frequency synthesizer, a controllable divider is configured to allow for the division of t...
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JP2004177421A |
To obtain desired audio information without any operation for keyboard input etc., to enable an apparatus to be always put on a user's body without any feeling of physical disorder by making the apparatus small-sized, and to obtain audio...
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JP2004518388A |
If TDM connections are typically switched through from origination TDM network to a target TDM network by way of a data network as the backbone (ATM or IP) (e.g. VoIP). The transitions between the TDM network and the data network go thro...
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JP3537750B2 |
To provide an error control method for link layer in a broadband wireless communication employing a simultaneous multiple copying technology and an adaptive forward error control technology. This method includes a step (a) where an error...
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JP2004165771A |
To solve a problem of a conventional audio reproducing apparatus that causes sound interruption and noise through the application of exception processing to all channels even if no error is included in other channel when even one channel...
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JP3535900B2 |
PURPOSE: To always automatically select and listen to data best received among plural data sent multiplexingly. CONSTITUTION: N-sets of transmission signal alphabet data received by an antenna 1 and demodulated by N-sets of correlation d...
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JP3534763B2 |
A speech signal is transmitted over a radio path by a mobile station, and is received in a first base station. The speech signal, encoded using encoding parameters, is forwarded in the information frames from the first base station to a ...
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JP3535901B2 |
PURPOSE: To improve a CNR (signal power to noise power) in the reception of a modulation signal subject to an OFDM(orthogonal frequency division multiplex). CONSTITUTION: A multiplex signal received by an antenna 1 and filtered by a 1st ...
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JP3531780B2 |
To reproduce high quality voices using a small bit rate. Inputted voices are fed into a linear prediction inverse filter 18 and residue signals r(t) are obtained. Then, the signals r(t) are segmented (31) into one pitch period for every ...
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JP3532556B2 |
To provide an equipment and its method for performing data communication between at least two data stations, which is well-suited to be used as radio local area network for highly reliable data communication via radio communication chann...
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JP3533421B2 |
A first and second digital rate converter device and method provides for synchronization between a first digital sample sequence and a second digital output sequence related to the first digital sample sequence for a rate converter pair ...
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