Login| Sign Up| Help| Contact|

Patent Searching and Data


Matches 651 - 700 out of 9,840

Document Document Title
WO/1992/008289A1
DE 37 02 490 describes a process for data transmission in which data from pixel blocks are converted into digital signals which are coded with variable word length. Here the digital signals are displayed in blocks of an average length. I...  
WO/1992/006467A1
An electronic system and a method substantially eliminates any delays caused by buffering of a signal containing speech. The electronic system comprises a receiver for receiving signals (16), a buffer (26), coupled to the receiver, a buf...  
WO/1992/005541A1
A voice coding system which finds by evaluation operation a code vector that minimizes the error between an input voice signal and a reproduced signal obtained through a linear estimation synthesis filtering simulating the vocal tract ch...  
WO/1992/000637A1
For individual tuning of the dynamics of a radio programme signal (variable dynamics), a control parameter is derived from the associated radio programme signal and emitted together with the programme signal. At the receiver, the control...  
WO/1991/018361A1
The disclosure involves the use of a library of modulated wavelet-packets which are effective in providing both precise frequency localization and space localization. An aspect of the disclosure involves feature extraction by determinati...  
WO/1991/018464A1
A pi/4-shift DQPSK modulator modulates a digitized voice signal and other information. An FM modulator modulates the analog voice signal and other information. The FM modulator is coupled to the quadrature mixers (109 and 110) of the pi/...  
WO/1991/016769A1
This invention relates in general to high-quality low bit-rate digital transform coding and decoding of information corresponding to audio signals such as music signals. More particularly, the invention relates to signal analysis/synthes...  
WO/1991/015926A1
In a method of aligning a data receiver (2) with a data transmission from, e.g., a head-end station (1), data is encoded for transmission with a hybrid differential coding scheme including at least one invalid codeword, and the coding sc...  
WO/1991/013370A1
The figure shows a transmitter (10), where an oscillator (12) generates a base frequency of 100 kHz to be fed into a divide-by-four unit (14). The divide-by-four unit (14) produces a 25 kHz output signal to be fed into the regulated powe...  
WO/1991/010283A1
The invention relates to an interpolative analog/digital converter for band-pass signals in which the amplitudes of the scanning values are quantized in 2 consecutive stages. The first stage contains the actual analog/digital interface a...  
WO/1991/005412A1
The process disclosed enables the ''time domain aliasing cancellation'' method to be extended systematically to larger block overlapping. The boundary conditions which, when using various modified transforms, the analysis and synthesis w...  
WO/1991/005411A1
A signal, preferably an audio signal, is subdivided by windows into successive blocks each of which is converted into a spectrum by transform. The spectra resulting from the transform are then coded, transmitted, decoded after transmissi...  
WO/1991/003901A1
A relay exchange system in which a plurality of switchboards for switching transmission information contained in frames each consisting of m bits are connected in cascade using a plurality of transmission paths, a pair of multiplexers ar...  
WO/1990/016128A1
A signal transmission and/or storage system comprising a transmission stage and, after transmission and/or storage of signals transmitted on a limited band-pass medium involving processing to reduce the volume of information to be transm...  
WO/1990/014719A1
A signal, in particular an audio signal, is divided by means of windows into consecutive blocks which overlap by at least 50 % and the signal sections contained in the blocks are evaluated by means of analysis windows. The partial signal...  
WO/1990/011650A1
Electrical circuits suitable for encoding binary information, in accordance with a novel modulation method. The novel modulation method is referenced in the instant case, and it is explained that the method may be used when the encoding ...  
WO/1990/010980A1
A time domain communications system (10, 96) wherein time modulated (220), impulse derived signals are multiplied (226) by a template signal (234), integrated (248), and then demodulated (254, 258, 260). By this process, usable signals (...  
WO/1990/010993A1
A system for transmitting and receiving multiplexed video and audio signals. The video and audio signals are balanced to enhance the transmission quality and to use the transmission capability fully under the condition of a limited trans...  
WO/1990/009063A1
In a process for transmitting a signal which is subdivided by windows into consecutive, overlapping blocks, each partial signal contained in the blocks is converted by transformation into a spectrum, the sepctra are then coded, transmitt...  
WO/1990/009022A1
A transform encoder/decoder system employs a discrete transform, carefully designed analysis/synthesis window pairs, adaptive transform coefficient quantization, and adaptive bit allocation to encode high-quality music including broadcas...  
WO/1990/009064A1
A low bit-rate (192 kBits per second) transform encoder/decoder system (44.1 kHz or 48 kHz sampling rate) for high-quality music applications employs short time-domain sample blocks (128 samples/block) so that the system signal propagati...  
WO/1990/006632A1
A method of processing data for transmission from a transmitter (T) to a receiver (R) both of which are switchable between a compression mode in which the data stream is encoded or decoded with a data compression algorithm and a transpar...  
WO/1990/004890A1
A circuit for demodulating digital voice signals to prevent generation of large voice distortion when the interpolation is effected continuously to correct error in case error has developed continuously. The demodulation circuit comprise...  
WO/1990/004891A1
A circuit for demodulating digital voice signals to suppress the broken noise that generates when the synchronism is no more maintained or when the mute is forcibly applied. The demodulation circuit comprises a synchronism detecting circ...  
WO/1989/011759A1
The audio signal to be transmitted is divided into chronologically consecutive blocks through time slots, then the signal portions included in the blocks are converted into a short-time spectrum, thereafter the short-time spectra are cod...  
WO/1989/011761A1
Apparatus and method for analyzing a bit stream to determine whether the stream is encoded in A-law PCM or mu-law PCM. Bit positions (2, 3, and 4) are examined to determine which of the 8 possible segment codes are present. Segment codes...  
WO/1989/010661A1
According to the invention, an information signal is sampled, quantized and processed digitally through an information encoder (100). Digitally processed samples (1104, 1106) produced by the encoder (100) are modulated onto a communicati...  
WO/1989/010031A1
A method and apparatus for transmitting information comprises a signal generator (1) for continuously generating a pair of optical signals (f1, f2). These signals are similarly modulated in a modulator (5) with information to be transmit...  
WO/1989/008357A1
The device described has the following features: the device has a first input terminal to which is applied the input signal of the acoustic signal processing system to be monitored, a second input terminal to which is applied the output ...  
WO/1989/007866A1
In a method and apparatus for coding high quality digital audio signals, the signal is sampled at repeated intervals and the sample is filtered into a number of sub-bands, preferably four. The signal in each sub-band is coded by means of...  
WO/1989/007368A1
An improved apparatus (112) and method for sigma delta converter for bandpass signals is disclosed, suitable for use in mobile radio applications, between the front end and digital signal processing states, that includes at least one ban...  
WO/1989/007372A1
Variable length codewords are grouped into successive N bit word groups (25) in sequential order as received from a variable length codeword encoder (18). The N-bit groups are each stored in corresponding N-bit-wide memory locations in a...  
WO/1989/006418A1
Input speech is processed to derive (2) LPC filter parameters and (5) parameters of a multipulse excitation which are quantised (10) prior to transmission along with the filter parameters to a decoder where the excitation is generated an...  
WO/1989/003574A1
In a digital adaptive transform coding process for transmitting and/or storing acoustic signals, in particular musical signals, scanning values N of the acoustic signals are transformed into spectral coefficients M which are divided into...  
WO/1989/003140A1
During transformative coding of audio signals, the bits are allocated to the spectrum components for purposes of quantification. After a preliminary approximative quantification, there remains the problem of distributing the still availa...  
WO/1989/002148A1
In an LPC type coded communications system the excitation source is derived from previous filter outputs at the decoder; in one embodiment the speech output is used, in other embodiments, intermediate excitation outputs are used. To enab...  
WO/1989/002195A1
A device for coding and decoding sound broadcast signals comprises a coder and a decoder, the circuit structures of which provide for band coding of the sound broadcast signals in a spectral zone with due regard to the masking effect wit...  
WO/1989/001264A1
An analog communication system having an analog-to-digital storage system including a transmitter (350) and at least one remote receiver (10, 358) for receiving an incoming signal carrying an analog component. The system is adapted to tr...  
WO/1989/000790A1
A signal having a non-uniform probability density is processed for transmission in pulse code modulated form. The signal is quantised using conventional methods and the quantised signal then coded using a non-sequential coding scheme in ...  
WO/1989/000796A1
Values, such as a set of coefficients in a transform-based video coder are to be transmitted sequentially in any one of a number of possible preset orders. The order to be selected is the one that results in the largest number of consecu...  
WO/1988/010035A1
An encoding system for transmission and reception of speech signals and utilizing sampling, filtering (12) and sub-band coding (14) techniques for reduction of the bit rate. The energy levels of each sub-band are determined with respect ...  
WO/1988/005621A1
First and second stations (1, 2) are linked by a transmission path (3). At least the first station has an echo canceller (14): simultaneous transmission by the second station takes place only during periods which immediately follow a per...  
WO/1988/004119A1
Signal transmission system equipped with a transmitter (11) and a receiver (12). The transmitter (11) has first clock extract means (13, 14) which detects synchronizing signals contained in a first DAI format signal from the receiver (12...  
WO/1988/004117A1
For purposes of transmission audio-signals are numerically represented by a plurality of spectral partial band signals by means of quadrature mirror-filtering. The quantification of the scanning values in partial bands, for example 24 pa...  
WO/1988/002201A1
A system for companding digital audio signal samples processes the digital audio signal samples to correct errors induced by the compression and expansion processes. These errors are calculated prior to compressing the samples. The error...  
WO/1988/001811A1
A digital coding process for transmitting and/or storing acoustic signals, in particular musical signals, in which N pick-up values of the acoustic signal are transformed into M spectral coefficients. The process is characterised by the ...  
WO1988000417A3  
WO/1988/000417A2
A digital broadcasting process, suitable for digital audiobroadcast, comprises encoding the data in the form of binary words using a redundant code to obtain a sequence of modulation symbols and transmitting the symbols in a plurality of...  
WO/1987/006783A1
A method of recording and reading of numerical sound information signals provides for compression in time of the numerical sound information signals by separating the sequence of numerical signal code values corresponding to the pause in...  
WO/1987/006368A1
Apparatus and methods for encoding information of one class into the parity for main data of another class. The methods and apparatus fundamentally take one member of a limited first class of data and concatenate it with main data (20). ...  

Matches 651 - 700 out of 9,840