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WO/2001/058024A1 |
A method of coding information for transmission over a communication channel involves differentially coding selected bits of an input sequence with respect to bits of a previous input symbol to generate a transmit sequence comprising a p...
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WO/2001/052411A2 |
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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WO/2001/047203A2 |
The invention relates to a method and transmitting devices for transmitting and/or receiving information using waves. According to said method, an information signal is impressed onto a carrier wave, whose frequency is continuously modif...
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WO/2001/043367A1 |
A method and a system for implementing leaf node proxy in a network are disclosed. In one embodiment, a leaf node is switched to a standby state in response to a standby command. A leaf node self-identification ('self-ID') packet is synt...
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WO/2001/041314A1 |
A method and radio device are provided for interleaving a stream of data (201) consisting of digital information symbols prior to transmission over a radio interface. A permutation is performed (202, 203, 401, 402) to the stream of digit...
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WO/2001/037461A1 |
To generate a high-power modulated radio frequency (RF) signal (S¿OUT?) from an input low or medium frequency information signal (S¿IN?) the information signal is pulse-shaped in a quantifier (108) to form a digital signal (S¿D?) havi...
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WO/2001/031868A1 |
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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WO/2001/026274A1 |
According to the invention, elements to be transmitted are distributed to several radio frames and repeated by an interleaver. The repetition is carried out in such a way that the pattern prevents that the distance between two randomly s...
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WO/2001/026094A1 |
A noise section detection unit (101) separates an input signal into a voice section and other sections to detect a signal in sections other than the voice section as a background noise. A noise level estimation unit (102) estimates a noi...
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WO/2001/024382A1 |
The invention relates to a process for channel encoding in an information transfer system and a device for execution thereof.
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WO/2001/024164A1 |
A voice analyzer (101) in a voice encoder (100) extracts the fundamental frequency and spectral envelope information from an input voice signal. A fundamental frequency quantizer (102) quantizes the fundamental frequency. A matrix genera...
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WO/2001/024549A2 |
A method and system are disclosed for transmitting a digital representation of voice data. A first step of the method includes sampling and digitizing a voice signal and generating a first data stream having a bit rate of X bits per seco...
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WO/2001/020892A2 |
A telecommunications data transmission system (1) for communicating between a client's PC (2) and a server (3) of an internet service provider comprises transmission between a PCM codec modem (5) of the server (3) and a liner codec modem...
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WO/2001/016941A1 |
In a sinusoidal audio encoder it is known to use different time scales for analyzing different parts of the frequency spectrum. In prior art encoders sub-band filtering is used to split the input signal into a number of sub-bands. By spl...
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WO/2001/015358A2 |
A method for transmission of compressed data for a digital audio broadcasting system comprises the steps of producing digital information representative of an audio signal; estimating the number of bits to be allocated to the digital inf...
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WO/2001/013518A1 |
A chaotic carrier pulse position modulation communication system and method is disclosed. The system includes a transmitter (12) and receiver (14) having matched chaotic pulse regenerators (16, 18). The chaotic pulse regenerator in the r...
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WO/2001/013375A1 |
A transmitter is disclosed for transmitting a digital information signal having M bit PCM samples via a transmission medium. The M bit PCM signal is split (8) into a P bit PCM signal, whereby P < M and a difference signal. The P bit PCM ...
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WO/2001/010035A1 |
A Sigma-Delta modulator(10) comprises a signal input (34) coupled to a forward filter comprising a series connection of a plurality of N summing stages (28, 30, 32), where N is an integer of at least 2, alternating with a corresponding p...
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WO/2001/005074A2 |
The invention concerns a method whereby the audio data of a source of useful signals (1) are separated (2) into a main dataflow (HD) and a secondary dataflow (ZD). The main dataflow (HD) contains at least as much information as required ...
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WO/2001/004734A2 |
An expansion processor (202) has a buffer defining unit (240) for defining one of two buffers (BUF1, BUF2) as a present inverse quantization buffer and defining one of two buffers (BUF11, BUF12) as a present restoration buffer, an invers...
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WO/2001/005076A1 |
The invention is concerned with a method and an apparatus, wherein information data is sent between at least two transceivers in a telecommunication system. The information data is transmitted from the sender of a transceiver to the rece...
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WO/2001/003316A1 |
A communications system (10) transmits a near end digital signal using a compression code comprising a plurality of parameters including a first parameter. The parameters represent an audio signal comprising a plurality of audio characte...
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WO/2001/002929A2 |
A communications system (8) transmits digital signals using a compression code comprising a plurality of parameters including a first parameter. The parameters represent an audio signal comprising a plurality of audio characteristics, in...
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WO/2001/003317A1 |
A communications system (10) transmits digital signals using a compression code comprising a predetermined plurality of parameters including a first parameter. The parameters represent an audio signal comprising a plurality of audio char...
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WO/2001/003122A1 |
The invention relates to a method for improving the coding accuracy and transmission efficiency of an audio signal. According to the method, a part of the audio signal to be coded is compared with earlier stored samples of the audio sign...
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WO/2001/001614A1 |
A system and method for adaptive voice buffering is disclosed. In a voice transmitter, a ring buffer uses read and write pointers to implement changes in the delay of a communication link. The receiver also implements a ring buffer havin...
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WO/2000/079763A1 |
A technique for compressing header information (43) to produce a compressed header portion (46) of a data packet to be transmitted across a communication channel includes generating a checksum (51) from the header information (43), and p...
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WO/2000/079520A1 |
A multi-channel audio compression technology is presented that extends the range of sampling frequencies compared to existing technologies and/or lowers the noise floor while remaining compatible with those earlier generation technologie...
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WO/2000/079706A1 |
A wireless receiver receives a wireless signal by inverting the polarity (78) of an incoming waveform on every one half clock cycle of a conversion clock to produce a commutated waveform and converting said commutated waveform to a serie...
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WO/2000/077971A1 |
The circuit has an input signal which is filtered with a first filter having a bandwidth greater than a bandwidth of the desired signal. The filtered signal is then sampled to generate discrete time samples, which is then filtered with a...
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WO/2000/074036A1 |
A voice decoding device smoothes the filter factor intermittently transmitted similarly to the RMS in decoding a voiceless section and feeds it to a synthesis filter, so that the discontinuous change of the filter factor due to the inter...
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WO/2000/065720A1 |
In a digital image processing device (10) such as a portable camera, an analog decimation circuit is provided as a front end for the digital video imaging circuit so that the data is reduced without substantial loss of fidelity so that p...
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WO/2000/065713A2 |
Sample rate converters are known, and are used to convert a signal with a first sample rate (sampling frequency) into a signal with a second sample rate (sampling frequency). To obtain a flexible sample rate converter with sampling frequ...
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WO/2000/065790A1 |
An improved Nyquist filter can be used as a matched filter in a digital communications system. This filter is characterized in that the frequency domain response meets the Nyquist criteria and that the square root of the frequency domain...
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WO/2000/063886A1 |
Techniques like Huffman coding can be used to represent digital audio signal components more efficiently using non-uniform length symbols than can be represented by other coding techniques using uniform length symbols. Unfortunately, the...
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WO/2000/064073A1 |
Apparatuses for a transmitter and a receiver (202) which enhance the performance of a system utilizing interleaving and transmit diversity by reordering the sequence of symbols transmitted along the different transmission channels. This ...
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WO/2000/046922A1 |
A frequency offset differential pulse position modulation scheme is used to transmit data between computing devices (105A, 105B) within a wireless network system (100). The differential pulse position modulation component of the scheme p...
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WO/2000/046932A1 |
A method and apparatus for communicating both voice and control data between a communication device (such as a cellular phone) (100) and an external accessory (such as a hands-free kit) (102) over a data bus (101). The method includes fo...
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WO/2000/045533A1 |
Methods are provided for determining whether any slots of a modem frame are subjected to robbed bit signaling (RBS), and whether the robbed bit signaling is $g(b)-codec robbed bit signaling. From an obtained DIL sequence, an ordered tabl...
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WO/2000/045524A1 |
Methods are provided for generating at least one translation table for a modem having a frame having a plurality of slots. DIL sequence information from another is used to generate ordered table of levels (15), and distances (20) between...
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WO/2000/045534A1 |
Modem constellations are designed by independently optimizing for each slot of a frame, the distances between constellation points used for that slot. A maximum number of points N(0) (824) are chosen having at least the minimum distance ...
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WO/2000/045525A1 |
A method in a modem having a frame having a plurality of slots, for determining whether incoming DIL sequence information contains A-law or mu-law is provided. From the DIL sequence information, an ordered table of levels for each slot i...
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WO/2000/042781A1 |
The invention relates to a method for implementing multipoint codes in an exchange with which it is possible to e.g. carry out a network consolidation and connect additional network providers in an existing network. A network identifier ...
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WO/2000/041315A1 |
The invention relates to a method for coding, transmitting and decoding digital multimedia data. The aim of the invention is to protect said data in relation to the errors that are created by the respective channel. Different importance ...
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WO/2000/041347A1 |
Interleaving within a communication system occurs by finding a minimum value (m). A maximum-length sequence generator is initialized to 1 and a bit reverse sequence generator is initialized to 0. An n bit output is determined from the bi...
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WO/2000/035161A1 |
When the setting of the compression/expansion rules of an encoder or decoder contains an error, it causes a problem that even when it should be judged that a channel is electrically connected, a misjudgement is made. A channel check test...
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WO/2000/033527A1 |
Methods and systems are provided for receiving a modulated signal including symbols representing both encoded and unencoded bits from a data (e.g., speech) frame where a received slot is first demodulated and the encoded bits are decoded...
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WO/2000/031981A1 |
An image processing device which improves the transmission of image data over a low bandwidth network by extracting foreground information and encoding it at a higher bit rate than background information.
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WO/2000/031719A2 |
The quality of comfort noise generated by a speech decoder (93) during non-speech periods is improved by modifying (30, 75) comfort noise parameter values (33) normally used to generate the comfort noise. The comfort noise parameter valu...
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WO/2000/030101A1 |
A method and an arrangement are disclosed for embedding supplemental data in an information signal such as a sigma-delta modulated audio signal. The encoded signal includes two or more channels, e.g. a left channel bit stream (z¿1?) and...
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