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WO/1995/022858A1 |
In a process for the cascade coding and decoding of audio data, the spectral components of the relevant short-time spectrum are formed for a data block with a given number of time input data, the coded signal is formed on the basis of th...
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WO/1995/019072A1 |
The present invention provides a transcoder (400) for transcoding of digitally encoded bit streams produced by predictive encoders. The transcoder of this invention is less complex than previously known transcoders in terms of both compu...
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WO/1995/018494A1 |
A data frame structure for variable size data constellations includes repetitive data segments each containing a fixed number of symbols arranged as a data segment sync character and data bytes. The frame includes a header segment includ...
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WO/1995/017049A1 |
A transmission system includes transmit and receive paths coupled via a hybrid circuit (16) to a bidirectional transmission path (18). The transmit path includes a DAC (14) having a given rang and precision. The transmit path signal is l...
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WO/1995/016315A1 |
In a TDMA cellular telephone system, an error concealment method provides parameter interpolation based on soft quality measures that will enhance the speech quality under bad channel conditions compared to prior methods of repeating pre...
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WO/1995/016333A1 |
A multi-channel signal compressor for compressing digital sound signals in the respective channels of a multi-channel sound system. The apparatus comprises a first-stage compression system and a second-stage compression system. In the fi...
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WO/1995/013660A1 |
When a time region sample or a frequency region sample of input signals such as audio signals is quantized, the present invention executes block floating processing of MDCT coefficient as a frequency region sample, for example, then exec...
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WO/1995/012943A1 |
A communication system for transmitting variable rate data is disclosed wherein redundancy is added to the variable rate data to provide repetition symbols. The repetition symbol data is transmitted with symbol energy scaled in accordanc...
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WO/1995/012939A1 |
A method of pulse-position modulation in a spread-spectrum communication system which is capable of transmitting more than one bit per received and recognized chip sequence in a system in which an entire chip sequence is required to prod...
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WO/1995/012254A1 |
A transmitter for transmitting at least a first and a second main signal component (L+R) is disclosed, having at least two input terminals (1, 90) for receiving the at least two input signals. The transmitter comprises multiplexer means ...
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WO/1995/010890A1 |
In a transmission system for transmitting speech and music signals, an input signal is split up into two spectral portions in a coder. These spectral portions are coded each by its own sub-coder. The transmission quality may be improved ...
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WO/1995/010885A1 |
A method and apparatus for demodulating a pulse width modulated (PWM) signal previously modulated with either a first or second data value comprises sensing an actual duration of the first period of the bit cell, and generating an actual...
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WO/1995/008877A1 |
The invention relates to a transcoding and transdecoding unit in a digital mobile radio system, and to methods for adjusting their output signals. The unit comprises an expander unit (ED) for converting companded digital data (SD1) into ...
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WO/1995/008241A2 |
A speech encoder converts analog speech signals into a stream of binary coded speech samples. A circuit for performing analog to digital conversion compares an input speech signal with a signal from a digital integrator. Based on the com...
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WO/1995/008152A1 |
A communication system implements detection of bad frames of information by utilizing multiple bit correction thresholds. Equipment used within the communication system adapts to different signaling environments by dynamically altering t...
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WO/1995/006984A1 |
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to method and apparatus for reducing the amount of information required to convey a...
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WO/1995/002930A1 |
The invention relates to computationally efficient sophisticated perceptual models which can provide a basis for adaptive bit allocation and quantization of encoded information useful in high-quality low bit-rate coding systems. In one e...
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WO/1995/002928A1 |
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to adaptive bit allocation and quantization of encoded information useful in high-q...
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WO/1995/002929A1 |
The invention relates in general to low bit-rate encoding and decoding of information such as audio information. More particularly, the invention relates to computationally efficient adaptive bit allocation and quantization of encoded in...
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WO/1995/001680A1 |
A signal encoding device which encodes acoustic signals is provided with a conversion circuit (601) which converts inputted acoustic signals into frequency components, signal component separation circuit (602) which separates the output ...
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WO/1994/029982A1 |
The invention relates to a speech decoding method and a speech decoder. The speech decoder receives information frames containing speech encoding parameters. The first bits in each frame form a synchronization word, and a synchronization...
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WO/1994/028542A1 |
A discriminator (24) discriminates between stationary and non-stationary signals. The energy E(Ti) of the input signal is calculated in a number of windows Ti. These energy values are stored in a buffer (52), and from these stored values...
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WO/1994/025960A1 |
A transmission system is described comprising at least a coder (101) for coding a signal (10a). The system furthermore comprises at least a transmitter (102), at least a receiver (103) and at least a decoder (104). At least for a coder (...
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WO/1994/025961A1 |
A transmission system is proposed comprising at least a coder (101) for coding a signal (10a). The system furthermore comprises at least a transmitter (102), at least a receiver (103) and at least a decoder (104). At least for a coder (1...
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WO/1994/026068A1 |
A method for the differential coding and decoding and related circuits are disclosed here. The differential coding is a special type of coding which, instead of coding directly an input signal, carries out the difference between this sig...
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WO/1994/021049A1 |
A method and apparatus are provided for digitizing a wide frequency bandwidth signal (105). The digitizing is accomplished by separating the wide frequency bandwidth signal (105) into a plurality of narrow frequency bandwidth signals wit...
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WO/1994/019790A1 |
Analysis by synthesis calculates a difference by subtracting (130) synthesized speech from input speech. The synthesized speech is formed by exciting long and short term filters (124, 126) with excitation vectors from a codebook store (1...
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WO/1994/019882A1 |
Adaptive digital coding of received analog information based on signal strength can be accomplished in the following manner. Once a repeater receives analog information from a communication unit (200), the signal quality of the received ...
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WO/1994/018762A1 |
A method and apparatus for encoding digital data within digital words representing signal waveforms, includes the step of modifying least significant digits of the digital words representing signal waveforms in dependence upon the digita...
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WO/1994/010769A1 |
In DECT-standard telephone connections between a base station and mobile terminals, speech is transmitted in ADPCM-coded form. In this digital ADPCM transmission, bit errors result in strong crackling and background noise. For the durati...
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WO/1994/010758A1 |
A process for transmitting and/or storing digital signals from several channels is particularly suitable for transmitting the five channels of a 3/2 stereophonic system, as well as for transmitting two stereo channels and three additiona...
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WO/1994/007313A1 |
A process for coding speech signals to be transmitted by an emitter over a limited transmission capacity (BBR) channel to a receiver with speech coder and channel coder is characterized in that the speech coder and the channel coder have...
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WO/1994/007148A1 |
A process is disclosed for scanning an analog, periodical measurement signal affected with a phase jitter and which should be acquired in advance. A measurement value is recorded per individual signal and each ulterior measurement value ...
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WO/1994/006098A1 |
Improved preprocessing and postprocessing for vector quantization, for example, for encoding an image. In one embodiment, the luminosity of the vectors in an image are used to determine the codes for vector quantization. In another embod...
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WO/1994/006099A1 |
Improved method and apparatus for vector quantization (VQ) to build a codebook for the compression of data. The codebook (600) or "tree" is initialized by establishing N initial nodes (610) and creating the remainder of the codebook as a...
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WO/1994/003984A1 |
A data compression method and apparatus are disclosed including a receiver (14) for accepting a series of data at an input representing information to be transferred and a processor (18) for selecting one or more maximal sequences to rep...
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WO/1994/003988A2 |
Digital signal processing systems for converting a digital signal of a first resolution to a digital signal of a second different resolution include a generator for dither noise. The dither noise is used in such a way as to mask or reduc...
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WO/1994/003983A1 |
A single clock cycle adaptive data compressor/decompressor (1/2) with a string reversal mechanism (6) is described which can perform data compression and decompression at the rate of one uncompressed symbol per clock cycle. The compresso...
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WO/1994/001816A1 |
Processor architecture comprising a central processing unit CPU (2, 4), a program memory (1) and a data memory (3), the central processing unit being functionally composed of a program execution portion (1, 2) and a data processing porti...
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WO/1993/025016A1 |
The invention relates generally to an apparatus and a method for receiving and processing information, and for adapting the operational characteristics of the processing in response to material included in the received information. More ...
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WO/1993/025007A1 |
A sound information compression method of well classifying and coding inputted sound information in large dimensions in a short time using a correlation map of three or more dimensions for classifying inputted information and for storing...
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WO/1993/022847A1 |
A converter (200) includes a transmit circuit that converts modem transmit samples at 9,600 samples/second into samples that may be transmitted by a T1 channel bank at 8,000 samples/second. The converter also includes a receive circuit t...
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WO/1993/021710A1 |
Methodology, and associated circuitry, for encoding (e.g., 200) and decoding (e.g., 900) an incoming data stream (201) utilize a coordinated code constellation (e.g., Fig. 3) that effects robust signal detection in the presence of channe...
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WO/1993/019536A1 |
A data compression process is disclosed for the storage and/or transmission of digital audio signals. Known processes, such as ASPEC, allow high quality music to be transmitted in a data stream that contains less than 10 % of the informa...
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WO/1993/018615A1 |
A method for differentially coding image blocks by coding the difference (9, 11, 6, 8) between the current block of the image to be transmitted and one of the four blocks of the recreated current image (17) nearest to said block. For thi...
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WO/1993/018383A1 |
A method and apparatus for allocating transmission bits for use in transmitting samples of a digital signal. An aggregate allowable quantization distortion value is selected representing an allowable quantization distortion error for a f...
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WO/1993/017508A1 |
A method and a system for processing digital audio signal pre-echoes. Samples x(n) are frequency transform block-coded as coefficients y(k) then transmitted as coefficients Cy(k), decoded as coefficients y'(k), and reverse frequency tran...
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WO/1993/017508A2 |
A method and a system for processing digital audio signal pre-echoes. Samples x(n) are frequency transform block-coded as coefficients y(k) then transmitted as coefficients Cy(k), decoded as coefficients y'(k), and reverse frequency tran...
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WO/1993/016568A1 |
Described is a bit oriented digital switch comprising means (SPM1, ..., SPM8; WSW1, ..., WSW8; WCM1, ..., WCM8; WM1, ..., WM8; BSW1, ..., BSW8; BCM1, ..., BCM8; BM) for controlled change of bit position and PCM word of chosen bits and bi...
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WO/1993/015562A1 |
In a digital audio-signal transmission process, the digitalized audio-signals are coded in subbands; one or more scaling factors are determined for each subband, the thus coded signals are transmitted in data frames, then decoded and rep...
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