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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...
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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...
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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...
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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 ...
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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...
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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 ...
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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...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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). ...
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WO/1987/006083A1 |
A time division multiplexed (TDM) communication system, which apportions radio frequency communication channels into at least two time slots. Voice signals for transmission on this system are analyzed and vo-coded into a digital signal t...
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WO/1987/005180A1 |
A system for transmitting animation image signals wherein information is compressed on the sending side by encoding the animation image in the frame and among the frames, the image signal is divided into transmission frames of a predeter...
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WO/1987/005178A1 |
In the method for digital video signal transmission, coding prescriptions are adapted in time intervals.
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WO/1987/003128A1 |
An encoder for an analog speech signal includes a first signal path (1-40) and second signal path (50-70) for processing the analog signal. The first path includes a clipper (30) for clipping the analog signal, and a digitizer (40) for c...
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WO/1987/002849A1 |
A system for transmitting information along a common channel by means of amplitude division multiplexing. Such a system may be used to transmit RGB video signals to a network of visual display units (VDU). An encoder (1) receives RGB sig...
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WO/1987/001542A1 |
A private telephone line expander which receives two analog voice inputs (XMIT A and XMIT B). Both input signals are digitized (75) compressed using full period splicing (40), and converted back to analog for transmission (90). One is sh...
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WO/1987/001531A1 |
The digital receiver (100) contemplates a digital radio receiver which operates on a received analog signal which has been converted to a digital form after preselection at the output of the antenna. The digital receiver (100) of the pre...
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WO/1986/007658A1 |
The system includes a source of polarised electro-magnetic radiation (1) such as a laser whose output radiation is fed to a polarisation modulator (2). The modulator (2) is responsive to digital information to cause, in successive clock ...
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WO/1986/005675A1 |
Un syst�me de t�l�m�trie pour un dispositif �lectronique implant� dans un sujet comprend un �metteur implant� poss�dant un circuit d'inductance commut� et accord� (4) reli� � un modulateur par d�placement de f...
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WO/1986/005340A1 |
The system transmits blocks of N signal values preceded by block code words which are used at the receiver (200) to detect errors. In the transmitter (100), the digital value of the intelligence signal being transmitted is sent to a pred...
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WO/1986/004198A1 |
A digital signal transmission device in which input digital signals consisting of a train of words that are continuous in time are formed into a block every after a predetermined number of words, and the block is transmitted through the ...
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WO/1986/001665A1 |
A digital communication system includes a predictive decoder (30) that is operative to convert received digital codes into a predictively decoded signal, e.g., speech signal, and to generate a set of predictive parameter signals and a si...
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WO/1986/001357A1 |
A data transmission method and apparatus, particularly useful in an SCA FM subcarrier data transmission system. The method comprises selectively arranging individual characters of data messages of varying bit rates in real time in a mult...
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WO/1986/001025A1 |
A digital processor for converting an analog input signal, such as a speech signal, into a digital bit stream output signal. In order to enhance the fidelity of the information carried by the digital bit stream signal, the processor incl...
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WO/1985/005723A1 |
The unperturbed signal sections are brought together in time, with elimination of the perturbed signals, in order to form a signal free from gaps. This solution enables even rather long interruptions in the signal to be rendered inaudibl...
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WO/1985/005747A1 |
A device in which any one of a plurality of predicting filters (4) is selected, and the digital signals are transmitted via the predicting filter (4) that is selected. In order to select any prediction filter (4) out of many prediction f...
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WO/1985/005517A1 |
The apparatus uses at least data in the straight PCM mode and data in the differential PCM mode of second or higher orders as data based upon a sampling value of input signals, and detects and compares maximum absolute values of data of ...
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WO/1985/005211A1 |
A system for correcting error in digital data, wherein the reproduced data signals are supplied to error correcting circuits (34), (43) to correct error in the reproduced data signals relying upon the interpolation or substitution of dat...
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WO/1985/004995A1 |
A sample and hold circuit (10) receives a low level analog input signal and is gated by a clock (18). The output of the sample and hold circuit (10) is summed with a signal from a noise source (22) and the resulting signal coupled to an ...
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WO/1985/003609A1 |
Zero crossing switching modulation systems are used in television, facsimile, modem and teletype transmission through voice phone lines; recording on voice quality media, i.e., magnetic tapes; electronic cameras, security systems and ins...
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WO/1985/002959A1 |
Transmitter and receiver for use in a digital communication system which are capable of transmitting and receiving, respectively, a single duplex analog signal channel, such as, for example, a voice channel, and limited short asynchronou...
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WO/1985/002732A1 |
A music data compression system which includes an analog to digital converter for converting the analog music signal to digital sample signal form, a digital compression filter for compression filtering the digital sample signals, and an...
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WO/1985/002509A1 |
Digital signals which are sent each with their own frequency are corrected for frequency-dependent attenuation of the transmitting medium in a filter (5) so as to maintain a desired relationship between the amplitudes of the signals afte...
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WO/1985/000686A1 |
Apparatus for coding (Fig. 2A) an original speech signal having a waveform, including a waveform coder (14) operative at a low bit rate, for waveform coding the original speech signal to produce a coded signal having distortion, and an a...
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WO/1985/000257A1 |
Method for reading the signal to be detected according to the signal value and independently from the frequency range, as well as circuitry for implementing such method. The method according to the present invention is characterized in t...
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WO/1984/004859A1 |
It has been observed that the S/N ratio of differential-mode PCM and summation-mode PCM with respect to quantization noise is improved at low frequencies and high frequencies, respectively, and consequently the dynamic range thereof is i...
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WO/1984/004218A1 |
A method and apparatus of providing improved protection of the more significant bits of a linearly coded and error protected digital signal makes recursive use of coded range information relating to the original signal which has been not...
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WO/1984/002999A1 |
A PCM signal processing apparatus provides correction processing so that no pulse noise (abnormal sound) is generated by the reproduction of erroneous data (e.g., unerased data) that has not been recognized as an error from an error-dete...
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WO/1984/002443A1 |
Decoder for receiving and decoding a coded signal which includes a particular frequency fo with a first and second amplitude. The first amplitude of the frequency fo is associated with the end of a first coded message while the second am...
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WO/1983/003935A1 |
An apparatus for converting a signal sampled uniformely in the time domain to a signal sampled in the frequency domain, with certain samples excluded, transmitting the non-uniformly sampled signal and reconverting the transmitted signal ...
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WO/1983/003727A1 |
Modulation and coding method with reduced bit rate adapted to the signal wherein, as expected function for the centering of a signal expected set, it is possible to define an expected range so that it ideally considers and includes all d...
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WO/1983/002696A1 |
An ADPCM coder (100) converts a linear PCM input signal representative of PCM encoded speech or voiceband data into a quantized n-bit differential PCM output signal. Samples of the PCM input signal are delivered to a difference circuit (...
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WO/1983/000231A1 |
The object to be tested is supplied with a periodic analog measurement signal, preferably sinusoidal, respectively by digital samples of such a measurement signal wherein, the digital ratio between the duration of the measurement signal ...
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WO/1982/004515A1 |
A data processing system of the kind in which there is a transmission of a code format having a pattern that provides a plurality of reversals 1011010 etc. from which it is desirable to maintain bit synchronization for the incoming data ...
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WO/1982/001669A1 |
Exceptional atomization of liquids is achieved by combining shock wave formation and vortex generation in a gas stream. In a vortex generating device, a flow passage (11) is aligned with a flow axis (14) connected between a fluid inlet (...
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WO/1982/001111A1 |
A data transmission system where data signals are transmitted by the transmitter (101 and Fig. 2) with four possible two-bit binary states of the true data (221) and complement data (220) signal lines. A word state is provided before and...
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