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WO/1999/021187A1 |
Several audio signal processing techniques may be used in various combinations to improve the quality of audio represented by an information stream formed by splice editing two or more other information streams. The techniques are partic...
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WO/1999/020004A1 |
The invention relates to digital signal processing and specificly to level control of a pulse density modulated (PDM) signal generated by a sigma-delta modulator. A single-bit pulse density modulated PDM signal is generated by a first si...
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WO/1999/018681A2 |
A data processing device and method for use in a system for reducing quantization noise is presented. In some Internet access and other dial-up services, modems or other sources connect into analog switching systems, and then are A/D-con...
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WO/1999/018680A2 |
A system and method for reducing quantization noise is presented. In some Internet access and other dial-up services, modems or other sources connect into analog switching systems, and then are A/D-converted to reach remote switching off...
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WO/1999/014866A2 |
In a transmission system a signal to be transmitted by a first node (2) is applied to an encoder (8) and is transmitted by a transmitter (10) to a second node (6). In the second node (6) the signal from the transmission medium (4) is rec...
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WO/1999/013602A1 |
A method and system for controlling an encoding rate in a communication system utilizes feedforward rate information (48) and/or rate desirability information (50) sent from each of a plurality of variable rate vocoders (34) to a communi...
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WO/1999/013604A1 |
A method and system for controlling speech encoding in a communication system utilizes feedback information such as packet modification control data (154) sent from a communication link output controller, such as a network arbitor (142)....
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WO/1999/012342A1 |
The present invention provides an apparatus and method for supporting analog fax calls between two wireless subscriber stations (62, 70) in a tandem configuration. The existence of a tandem configuration is detected, and a more efficient...
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WO/1999/012258A2 |
The invention pertains to an audio frequency ripple control transmitter including a pulsed A.C. rectifier fitted with a capacitive accumulator (2). The transmitter (2) has a LC coupling device for oscillatory circuits (12), whereas the p...
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WO/1999/010988A2 |
The communication device comprises, connected in series, a binary information source, a carrier pulse generator, a transmitter, a communication link, a high-frequency signal receiver, a correlation-phase demodulator, a decision-maker, a ...
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WO/1999/009684A1 |
Auxiliary data (315, 414) is carried substantially imperceptibly with video transform data in combined transform samples according to a visibility threshold. The auxiliary data (315, 414) provides a capability for a copy protect scheme o...
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WO/1999/009656A2 |
The method relates to the transmission of messages in which a number of L components (m¿0?,...,. m¿L-1?) are coded by means of orthogonal functions to a signal (s(t)), and in which approximations of hermitic functions are used as ortho...
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WO/1999/007076A2 |
There is provided a channel encoder having convolutional encoders concatenated in parallel or in series. The channel encoder includes a first encoder for encoding input information bits, an interleaver having a memory and an index genera...
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WO/1999/005806A1 |
An oversampled, noise shaping signal processor (300) is described having at least one integrator stage (306) in the loop. A sampling stage (310) is connected coupled to the at least one integrator stage. The sampling stage samples an ana...
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WO/1999/001941A1 |
The present invention relates to a transmission device for transmitting, for example by radio, packets of successive bits of a voice signal. The device comprises differential coding means (11) for coding differentially said bit packets o...
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WO/1998/057435A1 |
A spectral and power shaping mapper (36) for high data rate signaling modem functions in a first mode having spectral and power shaping and using convolutional encoding, a second mode having power shaping, a third mode having power shapi...
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WO/1998/052188A1 |
An audio signal encoder and an audio signal decoder which can reproduce audio signals even when the decoder does not make full use of information from the encoder. A quantizing section constituting the encoder (1) is constituted to have ...
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WO/1998/050983A1 |
A communications system (10 and 12) in which a communications channel is defined at least in part by an electromagnetic wave (78) having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-li...
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WO/1998/047297A2 |
A method is shown for transmitting a digital data message in time slots within fixed length time frames between a sending unit and a receiving unit. The message is transcoded for transmission according to a transcoding function and when ...
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WO/1998/047247A1 |
An efficient method for compressing audio and other sampled data signals without loss, or with a controlled amount of loss, is described. The compression apparatus contains a subset selector, an approximator, an adder, two derivative enc...
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WO/1998/047134A1 |
The invention concerns a method and a device for coding an audio signal by 'forward' and 'backward' LPC analysis, the coding being produced by 'forward' LPC filtering for non-stationary zones and on a synthetic signal based on 'backward'...
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WO/1998/045977A2 |
A mapper for a PAM encoder is provided and includes apparatus for generating (70) desired code levels, and a constellation matrix memory (40) which stores indications of a plurality of different N-dimensional constellations. The pluralit...
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WO/1998/045833A1 |
In a variable bitrate speech encoder (4) frames of speech samples are derived from an input speech signal by framing means (20). From the frames of speech samples, LPC analysis parameters such as LPC parameters are determined by analysis...
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WO/1998/045970A1 |
A system transmits digital information bits, which are encoded into a predefined number of signed symbols per frame from a transmitter (40) over a network (46) to a receiver, wherein the transmitted signed symbols have a desired spectral...
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WO/1998/039882A1 |
Ultrashort pulse time hopping code-division-multiple-access (CDMA) and time-division-multiple-access (TDMA) RF, IR, and optical communications systems (20, 30) in the time-frequency domain (60) comprise a transmitter (20) including a sho...
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WO/1998/039768A1 |
A post-processing method for a speech decoder (1) which gives a decoded speech signal in the time domain in order to obtain high frequency resolution from a frequency spectrum having non-harmonic and noise deficiencies. The method compri...
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WO/1998/038752A1 |
A pulse amplitude modulated (PAM) mapper (36) includes a constellation matrix memory (40) string indicating of a plurality of different constellations. The constellations are used individually or together to support a plurality of differ...
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WO/1998/038766A1 |
A sample rate converter (200) is described for converting an input data stream including a plurality of input samples (X) at one sample rate to an output data stream including a plurality of output samples (Y) at another sample rate. The...
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WO/1998/038631A1 |
To accurately determine rate and voice activity in moderate-to-low signal-to-noise ratios (item 703) (SNRs) to maximize voice quality, system capacity and/or battery life, parameters from a noise suppression system are used as inputs to ...
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WO/1998/037544A1 |
The invention relates to a method for coding discrete time signals (x�1?) sampled at a first sampling rate. According to said method second time signals (x�2?) are generated using the first time signals, the band width of which corre...
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WO/1998/036577A1 |
A predictive coding method for a dynamic image having two types of prediction modes of global motion compensation and local motion compensation, wherein an unnecessary code word MCSEL is reduced as much as possible, even by one bit, thus...
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WO/1998/035341A2 |
In a speech decoder (40) a speech signal is represented by a plurality of prediction parameters updated once per frame. Each frame comprises a plurality of sub-frames in which the excitation signal generated by a fixed codebook (52) and ...
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WO/1998/035448A2 |
In a speech communication network in which a transmitter (1) transmits speech signals via a network (4) to a receiver (8), it can happen that more traffic is offered to the network (4) than it can handle. In order to reduce the network l...
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WO/1998/035450A2 |
Focused error correction and/or focused error detection is used in the information coding system according to the invention. The purpose of the present invention is to present a speech encoding method, in which the number of speech param...
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WO/1998/035447A2 |
A method of coding an audio electrical signal using backward adaptive prediction. A first time frame of the audio electrical signal to be coded is received and transformed into the frequency domain using a modified discrete cosine transf...
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WO/1998/028936A1 |
The present invention relates to detecting speech channel back-looping in a speech processing device in digital telecommunication systems. The detection is based on the speech samples from different transmitters being independent of one ...
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WO/1998/026519A1 |
A subchannel within a CDMA signal is provided together with a system for receiving and decoding this subchannel. A message is transmitted over the subchannel by applying a sequence of phase rotations to the user data. A single subchannel...
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WO/1998/020423A1 |
A system (100) for communicating digitally-encoded acoustic information across a computer network (120) between computers (110). The system includes a plurality of client computers (110) coupled together via a computer network (120). Eac...
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WO/1998/015945A1 |
Transform coefficients of audio signal samples are grouped into subbands. A predetermined number of subband bit allocation patterns (encoding categorizations), specifying parameters including quantization step size, dead zone, maximum bi...
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WO/1998/015946A1 |
Desired audio information intermittently present in a first audio signal is communicated over a communications medium by generating a first communications signal in the communications medium when the desired audio information is present ...
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WO/1998/013941A1 |
The mobile telephone detects bad data packets by decoding speech parameters represented by the packets and comparing those speech parameters against acceptable ranges of speech parameters. If the speech parameters do not lie within the a...
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WO/1998/011683A1 |
The present invention relates to arrangements and methods for radio frequency modulation and power amplification of an information signal (X�IF?). Modulation and amplification of the information signal (X�IF?) is carried out with ver...
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WO/1998/008329A1 |
A compensation system (figure 2A) for improving the accuracy of digital signals that are communicated through a digital network (113, figure 1) by reducing loss from attenuation quantization (DAQ) and rob bit signaling (RBS). The combine...
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WO/1998/008318A1 |
A cooperative feedback system (210) is provided for a compensation system associated with a transmitter or codec, for enabling the compensation system to improve the accuracy of digital signals transmitted to a digital network (113). The...
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WO/1998/003955A1 |
A digital data shuffling/deshuffling system which can prevent the decipherment of information data by an unspecified third person. The system is provided with a means which generates digital data of a plurality of bits to be transmitted,...
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WO/1998/003037A1 |
When coding and decoding stereophonic spectral values, both the intensity stereo process and a prediction process are used to achieve a high data compression. When an intensity stereo coding is active in a section composed of scaling fac...
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WO/1997/050202A2 |
A method and apparatus for communicating information with a user via electromagnetic radiation. The information can be communicated to or from an electronic device in accordance with a plurality of protocols to provide a plurality of ser...
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WO/1997/049216A1 |
An improved coding system (fig. 1) for digital compression applicable as a digital compression algorithm for increasing the bandwidth of telecommunications and broadcasting network. The system operates in the transmission regime, not in ...
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WO/1997/038416A1 |
The present invention relates to a method and an arrangement for reconstruction of a received speech signal (r), which has been transmitted over a radio channel that has been subjected to disturbances, such as e.g. noise, interference or...
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WO/1997/034404A1 |
An infrared communication system transfers secure communication signals between a source unit and a destination unit, while having low power comsumption in a wireless remote unit. The system comprises an audio processor (203), a scramble...
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