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WO/1997/031367A1 |
A speech compression system called "Transform Predictive Coding" or TPC, provides encoding for 7 kHz band speech at 16 kHz sampling at a target bit-rate of 16 or 32 kb/s one or two bits per sample. The system uses short and long term pre...
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WO/1997/027681A1 |
A self initialized coder and method thereof, the coder arranged and constructed for decoding an information stream (217), the coder including a buffer (301) for storing a portion (403) of the information stream, a controller (313) couple...
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WO/1997/025794A2 |
A transmitter provided with a subband coder is disclosed. The transmitter receives a wideband digital information at an input (1) and provides an output signal for transmission at an output (30). The input signal may have a varying sampl...
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WO/1997/023971A1 |
In a transmission system a sequence of digital symbols comprising concatenated words, is transmitted by a transmitter (2) via a transmission medium (14) to a receiver (16). In order to reduce the transmission capacity no word synchronisi...
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WO/1997/021211A1 |
A subband audio coder (12) employs perfect/non-perfect reconstruction filters (34), predictive/non-predictive subband encoding (72), transient analysis (106), and psycho-acoustic/minimum mean-square-error (mmse) bit allocation (30) over ...
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WO/1997/016009A1 |
A device for communication between a digital adapter (5) connected to an exchange (4) via a digital interface (7), particularly an ISDN interface, and an analog adapter (6) connected to an exchange (3) via an analog interface (8). Said e...
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WO/1997/015984A1 |
An encoding apparatus is provided for encoding a wideband digital signal, comprising an input (1) for receiving the wideband digital signal, a splitter unit (3) for splitting the wideband digital signal into a number of M sub-signals and...
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WO/1997/016008A1 |
A device for communication between a digital adapter (5) connected to an exchange (4) via a digital interface (7), particularly an ISDN interface, and an analog adapter (6) connected to an exchange (3) via an analog interface (8). Said e...
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WO/1997/015983A1 |
The method and the apparatus allow coding, manipulation and decoding of audio signals independently of the specific signal content. An encoder (AC) carries out an object-oriented coding and generates a coded signal, with variable bit rat...
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WO/1997/014139A1 |
A method and a device for predicting periodicity data present in a voice signal to be coded that is subdivided into a series of sub-frames. The prediction is performed using an adaptive dictionary built up from the optimal excitation of ...
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WO/1997/011535A1 |
A method and apparatus for selecting an error correction code rate in a cellular radio system. Each base station broadcasts a power product value, PP, which is its transmit power, PBT, multiplied by its desired receive power, PBR. A mobi...
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WO/1997/010584A1 |
An apparatus and method for processing a voice message to provide low bit rate speech transmission processes the voice message to generate speech parameters which are arranged into a two dimensional parameter matrix (502) including a seq...
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WO/1997/005602A1 |
The present invention teaches of a method of encoding linear predictive coefficient data. The present invention transforms the linear predictive coefficient data into line spectral cosine data (103). The line spectral cosine data is used...
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WO/1997/004621A1 |
The invention concerns a process for reducing redundancy during the coding of multichannel signals, the digital signals being predicted. A prediction error is determined which is then quantized and prepared for transmission via a transmi...
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WO/1997/003502A1 |
Known is a digital transmission system in which bit groups of a digitized analog signal are converted into corresponding analog signals before serial transmission in the form of a series of PAM-signals. At receiver side, an analog signal...
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WO/1997/002561A1 |
The invention relates to a method for mutual synchronization of the transmitter's speech encoder and the receiver's speech decoder in a communication system utilizing discontinuous transmitter between the transmitter and the receiver. Th...
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WO/1996/042137A1 |
A pulse position modulation detector divides a timing window (205) into a plurality of pulse position windows (210), determines the peak magnitude of a signal level (360) received during each pulse position window (210), compares the pea...
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WO/1996/041432A1 |
A receiver for acquisition and lock of an impulse radio signal comprising an adjustable time base to output a sliding periodic timing signal having an adjustable repetition rate, and a decode timing modulator to output a decode signal in...
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WO/1996/037048A2 |
In a method of lossless processing of an integer value signal in a prediction filter which includes a quantiser, a numerator of the prediction filter is implemented prior to the quantiser and a denominator of the prediction filter is imp...
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WO/1996/035269A1 |
Data representing an information signal are non-linearly quantized to generate respective quantized data that represent the information signal using fewer bits. Each of the data, when non-linearly quantized, is represented by a quantizin...
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WO/1996/034462A1 |
An impulse radio transceiver for full duplex ultrawide-band communications. The transceiver comprises an impulse radio transmitter to transmit impulse radio signal pulses, an impulse radio receiver to receive impulse radio signal pulses,...
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WO/1996/034465A1 |
The invention concerns a device comprising: a voltage/frequency converter (3 to 7) which receives the input voltage and emits pulses of a frequency proportional to this voltage; an electro-optical converter (8) which transforms the elect...
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WO/1996/031881A1 |
A data transmission apparatus for transmitting an original data has a converter for converting the original data to sequential data codes. The data code is formed by a combination of HIGH level binary codes and LOW level binary codes. Th...
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WO/1996/029800A2 |
A method and apparatus for detecting and indicating a collision on a wireless channel are provided. According to the method, data is transmitted over the wireless channel using pulse position modulation. The channel is monitored during e...
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WO/1996/029789A1 |
To monitor the transmission quality of digitised signals, the quantisation disturbance power is measured in a range in which no useful signals are transmitted. It is possible from the quantisation disturbance power to obtain the quantisa...
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WO/1996/028896A1 |
Data, as may be employed in telecommunications, is segmented into blocks (A), each block having associated therewith a metric of distortion (B) as a function of the number of bits in the block to represent the quality of the data contain...
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WO1996025809A1 |
In a quantization noise reduction circuit (200), a feedback signal (W) is added to an input signal (X) to the quantization circuit to reduce quantization noise. The feedback signal is generated as a filtered difference between a sample o...
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WO/1996/023297A1 |
A first remote vocoder (15) receives analog voice (170) and produces packetized vocoder data (190) which is transmitted over a wireless link (20). A first local vocoder (35) receives the packetized vocoder data (190) from the wireless li...
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WO/1996/022637A1 |
The invention relates to a signal processing method for a block-coded audio signal in an audio information transmission system with the steps: a) intermediate storage of each signal block properly transmitted; b) detection of an incorrec...
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WO/1996/021975A1 |
A method and apparatus is disclosed for determining a masked threshold curve as a function of frequency from an information signal. The method comprises a first step of determining for each frequency value a first masking component MC(1,...
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WO/1996/018244A1 |
A site controller (102) instructs a transcoder (121) to operate in a partial transcoding mode (401). While in the partial transcoding mode, the transcoder continuously monitors for a synchronization pattern. If the synchronisation patter...
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WO/1996/017449A1 |
Input data signals inputted to a data input terminal (1) are supplied to an FIR digital filter (4) having a low-pass characteristic through a memory (2). The memory (2) is controlled by a control circuit (6), and the data immediately bef...
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WO/1996/014695A1 |
The invention concerns a method and an apparatus for encoding a wideband digital information signal. The apparatus comprises a signal splitting unit (2) for splitting the signal into M narrowband subsignals (SB1 to SBM). A scale factor i...
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WO/1996/011531A2 |
In a transmission system for transmitting speech and music signals, an input signal is coded in a coder (11) by a time domain coder (4). The output signal of the time domain coder (4) is decoded by a time domain decoder (8) and the signa...
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WO/1996/009700A1 |
A method and apparatus for mitigating error in a received communications signal includes an error mitigator (35) of a communication unit (12) which receives and performs mitigation based on an error indication. In a first embodiment, the...
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WO/1996/009694A1 |
An impulse radio communications system using one or more subcarriers to communicate information from an impulse radio transmitter (901) to an impulse radio receiver (1400). The use of subcarriers provides impulse radio transmissions adde...
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WO/1996/008115A1 |
A method of transmitting timing critical data via an asynchronous channel. The timing critical data can be an MPEG transport stream of packets. The asynchronous channel can be a computer or telephone network, a digital storage media such...
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WO/1996/004653A1 |
In order to improve the transmission quality of block-coded audio signals in audio communications systems (e.g. in DECT cordless telephones) when transmission errors occur, with a view to reducing to a minimum the computer processing eff...
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WO/1996/003820A2 |
A method of, and system for, communicating messages in an environment which is subject to fading, in which data to be transmitted is encoded and formatted, a checksum (CSM) is determined for said encoded and formatted data and in which t...
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WO/1996/002091A1 |
The invention relates to a method and apparatus for speech transmission in a telecommunications system in which a speech signal is compressed to a small number of speech coding bits by a speech coding method, and the speech coding bits a...
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WO/1996/001527A1 |
A circuit for applying a predetermined algorithm to an input signal, comprises an input for receiving the input signal, a signal processing device for processing the input signal in accordance with the predetermined algorithm, and a devi...
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WO/1995/032556A1 |
The arrangement for determining a signal spectrum of a wideband digital audio signal in an adaptive bit allocation system, comprises signal splitting means (2) for splitting the wideband digital audio signal into M narrow band sub signal...
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WO/1995/030282A1 |
In a digital radio communication system in which information is transmitted and received in time slots and some bits of each received audio frame is interleaved over at least two time slots and other bits in each audio frame are non-inte...
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WO/1995/029541A1 |
Apparatus for determining a complexity measure of a data signal is disclosed which includes an encoder (14), having an input terminal (5) responsive to a data input signal (DATA IN) and a data output terminal producing a coded output sig...
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WO/1995/029540A1 |
Apparatus for sampling a signal parameter of a plurality of data signals is disclosed which comprises a plurality of sources (5) of data signals. Each data signal includes sequential groups of data. Each group of data in all of the data ...
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WO/1995/027977A2 |
A method of transmitting timing critical data via an asynchronous channel without changing any datum to be transmitted. The timing critical data can be an MPEG transport stream. The asynchronous channel can be a computer or telephone net...
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WO/1995/027978A2 |
During recording of an MPEG information signal on a record carrier (40), transport packets (Pk) are stored in signal blocks in a track (1) on the record carrier (40). x transport packets of the MPEG information signal are stored in the s...
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WO/1995/026083A1 |
In a process for coding a plurality of audio signals, the left and right-hand basic channels and the central channel are formed into a jointly coded signal by joint stereo coding which is decoded to provide simulated decoded signals. The...
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WO/1995/023461A1 |
The wireless communication system, comprising a transmitter and a receiver, operates according to the present PPM-FSK modulation format with two subcarrier frequencies f1 and f2. The PPM encoded data on the main data channel (43) are fed...
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WO/1995/022859A1 |
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 communication channel corrupted by multipath interfe...
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