Pulse or digital communications – Repeaters – Testing
Patent
1991-01-18
1993-09-14
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375 89, H04L 2710
Patent
active
052456315
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a process and a device for transmitting numerical data in the form of a sequence of words. For a given band of transmission frequencies, the invention permits a high flow of transmission.
In particular, it is applicable for transmitting numerical data representing an image in which each word represents a spectral characteristic (luminance, chrominance . . . ) of one point of the image.
BACKGROUND OF THE INVENTION
There currently exists a known system for transmitting numerical data appearing in the form of a sequence of words in which the words are successively converted into a variable frequency analog signal whose frequency represents the value of those words. Each period of the signal possesses a period proportional to the value of one word of the sequence to be transmitted. This analog signal is transmitted by any device, in particular by a telephone connection and is then decoded on the receiving location with the aid of a phase locking loop delivering a voltage proportional to the input frequency; this voltage is then converted into a numerical signal so as to restore the original numerical data.
The main defect of this type of system is that each word requires at least one period of the analog signal so as to represent its value. This limitation, which firstly results from the actual principle of the process and secondly the nature of the decoding means used (automatic control of the phase locking loop requiring at least one period), entails for a given frequency band a transmission flow (in words per second) limited to the value of the frequency. In addition, in such a system, it is necessary to introduce between words or groups of words synchronism pulses making it possible to recognize the relative positions of the data according to the decoding principle with the aid of a phase locking loop which generates an uncertainty in the position of the words. In addition, the phase locking loops are used in these systems up to the limit of their possibilities and are extremely delicate to adjust from the industrial point of view.
SUMMARY OF THE INVENTION
The present invention seeks to mitigate the defects of the above-mentioned known system.
The main purpose of the invention is to provide the new transmission process in which the coding and decoding of the numerical data permits a high transmission flow for a determined band of frequencies, this flow possibly being much higher than that of the known system for a similar accuracy of transmission.
Another object is to provide a decoding of the data in which the words are correctly positioned in the absence of any additional synchronization signal.
Another object is to provide a transmission device not involving any industrial adjustment difficulty.
Another object is to provide a device whose functions are able to be wired in a "VLSI" ("Very large scale integration") type integrated circuit.
Another object is to provide a device whose cost, volume and energy consumption are reduced.
To this effect, the process of the invention for transmitting numerical data (M) appearing in the form of a sequence of words (M1, M2, M3 . . . ) possesses a coding phase in which the data is converted into a periodic analog signal, a transmission stage consisting of transmitting said analog signal, and a decoding phase in which the signal received is converted into a numerical signal representing the data (M).
In the coding phase, the analog signal is drawn up from the numerical data by generating from said data and from a reference frequency (F) a numerical signal (Nv), the frequency of which is dependent upon said data in a time base linked to the reference frequency (F). Each period of said numerical signal is composed of p period fractions (p>1). Each function of one word (M1, M2 . . . ) of the data is encoded by carrying out on said numerical signal (Nv) a periodic transfer function with a predetermined form, especially sinusoidal, so as to generate a transcoded numerical signal (Nt) representative of the preceding si
REFERENCES:
patent: 3566033 (1971-02-01), Young
patent: 3668562 (1972-06-01), Fritkin
patent: 4066841 (1978-01-01), Young
patent: 4306308 (1981-12-01), Hossen
patent: 4809299 (1989-02-01), Ho
patent: 4972435 (1990-11-01), Ho
Bonnaval-Lamothe Michel
Ghebretinsae T.
Kuntz Curtis
Marchand Renaud
Societe de Recherche Development et en Application Matiere Breve
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