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5151698 |
Method for the coding of a digital signal, coder and decoder to implement this method, regeneration method and corresponding regenerator utilizing pulse position modulation
Method for coding a digital signal, a coder and decoder for implementing this method, a regeneration method and a corresponding regenerator. On each bit time, a detection is made of the possible...
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5128792 |
Self-synchronizing infra-red communication system
A self-synchronizing infra-red communication system. The coding scheme involves transmitting a series of pulses, the separations between successive pulses representing the same data. Even though...
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5113278 |
Communication system and apparatus using chip signals
There are provided a communication system and an apparatus for modulating a communication signal into a chirp signal and executing the communication. In the system, a signal to be transmitted is...
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5093844 |
Pulse-spacing decoder
A circuit for filtering pulse sequences of a given frequency out of a composite signal includes a series combination of a monostable multivibrator (MF) and a random-access memory (RAM), an address...
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5052019 |
Pulse-generating sensor unit for remote sensing system
In a digital remote-sensing system, in which the time intervals between pulses are modulated according to the value of the parameter being measured, an overly sensitive sensing element 30 may...
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5026156 |
Method and system for pulse interval modulation
A system and method for pulse interval modulating signals in accordance with a code wherein the code resides in the spacing between adjacent pulses. The invention has particular utility in...
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5023888 |
Pulse code recognition method and system
A system and method for pulse interval modulating signals in accordance with a code wherein the code resides in the spacing between adjacent pulses. The invention has particular utility in...
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5007042 |
Method and apparatus for transmitting analog data embedded in a digital pulse train
A method and apparatus for digitizing and transmitting one or more analog signals simultaneously over a two-wire line. The two-wire line not only provides the power required for the digitizing...
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4995058 |
Wireline transmission method and apparatus
In a wireline data transmission system for passing data between downhole and surface locations in a wellbore, a system for transmitting data at a frequency above the relatively low roll of...
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4992774 |
Method for powering remote visual displays and allowing for data exchange over the same wire pair
A novel way of powering a remote visual display and allowing data interchanges over the same wire pair. Such a station may be used for displaying the time, paging a person or an advertising...
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4972435 |
Frequency independent information transmission system
The system is used for transmitting information wherein each possible message unit in a set, (e.g. the alpha-numeric symbol set) is defined by a specific interval (I=f s /f R ) and messages are...
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4964139 |
Multi-purpose circuit for decoding binary information
Electrical circuits suitable for decoding binary information, in accordance with either of two novel modulation methods. The novel modulation methods are referenced in the instant case, and it is...
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4928318 |
Optical signal transmission system including pulsed FM modulator/demodulator
In the pulsed FM system, the input signal is first modulated into the pulse FM signal. Thereafter, this pulse FM signal is modulated into the pulsed FM signal by the frequency divider. This pulsed...
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4918689 |
Asynchronous communication system
Methodology, and associated circuitry, for encoding and decoding signals utilize combined time-signal path diversity techniques that trade-off bandwidth for autonomy of communications and...
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4912524 |
Digital signal transmission system having conversion means for reducing the light emission time of a light emitting diode
The invention relates to a system to transmit digital signals reproduced from a compact disk player, a digital audio tape recorder or the like. In order to increase the S/N ratio of transmission of...
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4896335 |
Digital 2B1Q transmitter with high precision and linearity time domain response
A digital 2B1Q transmitter utilizes a dual modulator to generate a 2B1Q coded output by summing two binary modulated vectors in a 2:1 weighting ratio, allowing one modulating envelope generator to...
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4888791 |
Clock decoder and data bit transition detector for fiber optic work station
Apparatus for use in a fiber optic transmission system having a variable bit rate and a variable duty cycle. The system senses data bit transmissions of bi-phase encoded data, and provides a...
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4870425 |
Communications system
A communication system particularly adapted for use in an aircraft collision avoidance system wherein the transmitted portions of messages changed between aircraft consist of pulses or pairs of...
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4866738 |
Circuit and method for deriving the word timing of a pulse position modulated signal
A method of deriving the word timing or word boundaries of a PPM signal, without requiring a synchronizing marker to be added to the PPM signal, employs a bipolar evaluation signal which begins at...
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4864648 |
Method of transmitting a group at least two measured values through an optical transmission path
A method of transmitting at least two measured values by means of light pulses which are passed by an optical transmitter through an optical transmission path to an optical receiver and whose...
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4800391 |
Method of and apparatus for message communication on Loran-C navigational signal broadcasts and the like with reduced navigation errors
In a Loran-C message communication system a method of obviating errors in navigation locking caused by sampling reception at the conventional symmetrical pulse modulation time intervals in advance...
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4787093 |
Combinatorial coded telemetry
A unipolar, RZ, constant width pulse telemetry is achieved in the combinatorial set, or any desired subset of pulse sequences thereof. Each input datum W is in one-to-one correspondence with a...
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4768207 |
Systems for receiving messages transmitted by pulse position modulation (PPM)
The present invention relates to remote control or trajectory calculation systems for missiles for example, and in particular to a message receiving device which may be mounted on the missle...
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4764769 |
Position coded pulse communication system
Pulse position coding is used to transmit several channels of data from a ground radar transmitter to a receiver in an airborne, remotely-piloted vehicle. The system is designed to ignore...
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4748446 |
Position coded pulse train
Pulse position coding is used to transmit several channels of data from a ground radar transmitter to a receiver in an airborne, remotely-piloted vehicle. The system is designed to ignore...
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4668950 |
Encoding apparatus and method for a position coded pulse communication system
Pulse position coding is used to transmit several channels of data from a ground radar transmitter to a receiver in an airborne, remotely-piloted vehicle. The system is designed to ignore...
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4648133 |
Synchronization tracking in pulse position modulation receiver
A clock pulse generator for decoding pulse position modulation in an optical communication receiver is synchronized by a delay tacking loop which multiplies impulses of a data pulse by the...
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4644563 |
Data transmission method and system
For transmitting binary data at a data transmission speed of F=1/[(N+1)T] bits/second, where N represents a value selected in accordance with a given transmission speed and T represents a...
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4642637 |
Method for transmitting data via a line of an alternating current distribution network, and a transmitter for carrying out the method
The transmitter generates a current signal typical of the data to be transmitted, as a load current of a specific load resistance. To transmit this current signal, the load resistance is connected...
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4641317 |
Spread spectrum radio transmission system
A communications system wherein an intelligence signal modulates the spacing of relatively narrow pulses of a fixed rate pulse train, and these pulses key on a transmitter which employs a pair of...
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4627075 |
Method of identifying possible valid data pulses in a position coded pulse train
Pulse position coding is used to transmit several channels of data from a ground radar transmitter to a receiver in an airborne, remotely-piloted vehicle. The system is designed to ignore...
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4627105 |
Signal transmission system and method
A sub-center type switched-star CATV system network in which a number of transmission signals are transmitted from a central source to a number of sub-centers over a number of sets of optical...
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4612653 |
Delay modulation phase coding
The use of delay modulation (or "Miller") phase coding to encode transmitted data is disclosed in a multinodal, peer network communication system. The use of delay modulation provides bandwidth...
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4584720 |
Optical communication system using pulse position modulation
An optical communication system using digital pulse position modulation employs a mode locked laser with a mode locking frequency equal to the time slot frequency of the modulation and means...
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4527276 |
Digital pulse position modulation communications system with threshold extension
A digital pulse position modulation (PPM) communications system with threld extension including a radio receiver for achieving optimum coherent detection of a pulse position modulated communication...
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4468788 |
Digital frequency translator for offset frequency generation of unmodulated signals
A frequency translator receives an input frequency signal and an offset frequency signal, and processes the signals digitally in order to obtain an output from a multiplexer. Pulse trains derived...
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4438519 |
Methods, and apparatus, for transmitting high-bit-rate digital data in power line communication media having high harmonic noise content
In a power line data communications system, high-bit-rate digital data is transmitted through a communications media, having high harmonic noise content, by use of a frequency-modulated chirp...
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4430652 |
Remote control system
A remote control system capable of utilizing manually encoded signals is disclosed. The system is particularly suitable for use in the logging industry because it is capable of utilizing...
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4399564 |
Fiber optic system for transmission of video signals by pulse-frequency-modulation
A fiber optic system utilizing pulse-frequency modulation (PFM) for transmission of video information signals substantially enhances the signal-to-noise ratio of the transmitted video signals. FM...
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4380746 |
Pulse modulator using capacitor charging and discharging circuits
A self-starting, non-latching, pulse modulator which will function as an analog divider of first and second input quantities, or as a linear pulse period modulator responsive to one of the...
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4357634 |
Encoding and decoding digital information utilizing time intervals between pulses
A method and apparatus for encoding and decoding digital information upon a recording medium using the time interval between adjacent pairs of pulses. A number "n" of unique time intervals between...
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4334214 |
Warning apparatus using microwaves
A warning apparatus comprises a Gunn oscillator, a transmitting antenna, a receiving antenna, a detector, and a comparator which produces a detecting signal when the output signal from the detector...
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4324002 |
Delay-modulated random energy intelligence communication system
1. An intelligence communication system comprising a transmitter and a receiver; said transmitter comprising non-periodic energy means for generating a carrier, means for effecting a change in the...
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4309703 |
Segmented chirp waveform implemented radar system
In a radar system utilizing same, a segmented chirp waveform is built up by frequency hopping trains of simple chirp pulses. Each chirp pulse in a train is identical and is transmitted on one of a...
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4300236 |
Radio signalling systems
This invention is a radio frequency identity system in which each user has a token containing a low power transmitter. If he wants to enter a security area, a receiver operates to let him enter if...
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4295221 |
Method and apparatus at one-way or two-way information link to effect interference suppression
A radio communication method and apparatus for transmitting a modulated radio frequency signal from a first station to a second station wherein an information-bearing pulse train for modulating the...
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4266201 |
Method and apparatus using first and second parallel channels, one of which includes an inverter, for producing an electrical signal with an improved on/off ratio
In certain types or electrical systems such as pulse modulators, it is extremely important that the systems have a high on/off ratio. To accomplish this, an electrical system is provided having...
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4253071 |
Phase modulator circuit
A problem with phase modulators particularly when modulating high frequency signals with signals of audio frequency is that noise is generated during the production of a free running ramp signal...
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4242664 |
Remote control arrangement
The invention provides remote control methods and arrangements using pulse code modulation for transmission as in infrared remote control arrangements. A primary feature is that only one quartz...
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4232297 |
Remote control arrangement using pulse spacing modulator
A remote control arrangement uses pulse code modulation for transmission as in infrared remote control arrangements. A feature of the arrangement is that only one quartz oscillator is necessary and...
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