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Patent Searching and Data


Matches 701 - 750 out of 9,841

Document Document Title
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...  
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...  
WO/1987/005178A1
In the method for digital video signal transmission, coding prescriptions are adapted in time intervals.  
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...  
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...  
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...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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...  
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 ...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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...  
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 ...  
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...  
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 (...  
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 ...  
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 ...  
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 (...  
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...  
WO/1982/000396A1
Apparatus for processing information signals in a plurality of information channels comprises a comparator (634-648) for comparing samples of a first information signal in a first channel (Y) with a plurality of selected combinations of ...  
WO/1982/000390A1
In an analog to digital converter circuit (10) for a CODEC a single reference voltage (VREF) is used for comparing both positive and negative input signals. The circuit comprises a capacitor array (40) to define the decision levels corre...  
WO/1982/000226A1
A single carrier is amplitude-modulated by a signal which is a transform (as the sine function) of the audio signal, and one set of sidebands is removed. In a receiver (76), the signal can be recovered by first deriving the Hilbert trans...  
WO1982000072A1
Un convertisseur analogique/numerique comprend des amplificateurs (2), un commutateur analogique (3) connecte par ses entrees aux amplificateurs (2) et une unite de comparaison a etages multiples (4) recevant a son entree le signal de so...  
WO/1981/003728A1
Subscriber line audio processing circuit apparatus comprising an analog-to-digital converter (16) coupled to a subscriber line for sampling an input audio signal at a first sampling frequency and for developing a series of digital words ...  
WO/1981/003725A1
An interpolative analog-to-digital converter comprising an integrator (77) for integrating the difference between an input analog signal x(t) and a quantized signal q(t) to develop an integrated signal, a first comparator (78) for sampli...  
WO/1981/003724A1
An interpolative encoder for a subscriber line audio processing circuit including an interpolative analog-to-digital converter as shown in Fig. 9 for converting an input analog signal to a digital signal including a series of multi-bit b...  
WO/1981/003590A1
A converter of P-codes into analog values comprises key elements (1) and an adder (2) of standard analog values, the output of which is the output of the converter. The converter is provided with a code sweep unit (5), a unit (6) for dif...  
WO/1981/000181A1
Pulse code modulated (PCM) signals are used to produce differential pulse code modulated (DPCM) signals and the (PCM) and (DPCM) are mixed and transmitted together as a composite signal whereby on reception all or substantially all the D...  
WO/1981/000180A1
Device for the tracking and recursive estimation of the local state of image contours, particularly in television, and application to the adaptative prediction in differential coding. The predictor according to the device operates by cal...  
WO/1979/000901A1
A predictive speech signal processor features an adaptive filter (120) in a feedback network (137) around the quantizer (111). The adaptive filter (120) essentially combines the quantizing error signal, the formant related prediction par...  
WO/1979/000462A1
A method and an arrangement for reducing the demand on the number of transferred bits when transferring PCM information. Polarity and amplitude information are transmitted from a transmitter side to a receiver side, expressed by binary c...  
JP2018148510A
[Subject] Quality of a Pulse-Density-Modulation signal of RF belt is improved. [Means for Solution] A communication apparatus generates and outputs an abnormal-conditions signal based on an amplitude ingredient signal and a phase ingredi...  
JP6378654B2  
JP6372268B2  

Matches 701 - 750 out of 9,841