Abstract 986, 757. Electric selective signalling systems. LIGNES TELEGRAPHIQUES ET TELEPHONIQUES. Oct. 23, 1962 [Nov. 8, 1961; Oct. 1, 1962], No. 40065/62. Heading G4H. In a gas chromatography system the position of a recording pen 0, Fig. 1, is converted into a corresponding amplitude significant voltage which signal is then converted into a frequency significant pulse train, by a frequency modulator, demodulator and shaper 2, 3, 4, the pulses of which are then counted 5 so as to produce a count representing the integral of the input displacement with respect to time. The contents of the counter 5 are transferred to relay stores 8 1 to 8p via a switching arrangement 6, 7, at appropriate times, so that each store records data relating to a single gas constituent. The outputs from the stores may be used for any purpose for example in a computer 12 for computing the calorific value of the gas mixture being analysed. In a modification (Figs. 2 and 4 not shown) a capacitor is charged to a level corresponding to the maximum displacement of the pen which charge is then digitised and stored by integrating, with the circuit shown in Fig. 1, the voltage across the capacitor as it discharges through a known resistor.
AN ANALOG INPUT DIGITAL MEMORY DEVICE COMPRISING: MEANS FOR CONVERTING THE INFORMATION TO BE STORED INTO ELECTRICAL SIGNALS; MEANS FOR CHANGING SAID SIGNALS TO ANALOG VOLTAGES; A FIRST LOCAL OSCILLATOR; MEANS FOR MODULATING THE FREQUENCY OF SAID OSCILLATOR IN ACCORDANCE WITH SAID ANALOG VOLTAGES; A DIGITAL COUNTER; A SECOND LOCAL OSCILLATOR OPERATING AT THE NOMINAL FREQUENCY OF SAID FIRST LOCAL OSCILLATOR; MEANS FOR COMBINING THE OUTPUT OF SAID FIRST AND SECOND LOCAL OSCILLATORS, AND FOR SUPPLYING A RESULTANT SIGNAL TO SAID DIGITAL COUNTER; A SWITCHING MATRIX CONNECTED TO THE OUTPUT OF SAID COUNTER; MEMORY MEANS CONNECTED TO THE OUTPUT OF SAID SWITCHING MATRIX; AND A TIMING GENERATOR CONNECTED TO SAID COUNTER, SWITCHING UNIT, AND MEMORY FOR CONTROLLING THE OPERATION THEREOF.
Claim 2
Dependent Claim
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AN ANALOG INPUT DIGITAL MEMORY DEVICE COMPRISING: MEANS FOR CONVERTING THE INFORMATION TO BE STORED INTO ELECTRICAL SIGNALS; MEANS FOR CHANGING SAID SIGNALS TO ANALOG VOLTAGES; A FIRST LOCAL OSCILLATOR; MEANS FOR MODULATING THE FREQUENCY OF SAID OSCILLATOR IN ACCORDANCE WITH SAID ANALOG VOLTAGES; A DIGITAL COUNTER; A SECOND LOCAL OSCILLATOR OPERATING AT THE NOMINAL FREQUENCY OF SAID FIRST LOCAL OSCILLATOR; MEANS FOR COMBINING THE OUTPUT OF SAID FIRST AND SECOND LOCAL OSCILLATORS, AND FOR SUPPLYING A RESULTANT SIGNAL TO SAID DIGITAL COUNTER; A SWITCHING MATRIX CONNECTED TO THE OUTPUT OF SAID COUNTER; MEMORY MEANS CONNECTED TO THE OUTPUT OF SAID SWITCHING MATRIX; AND A TIMING GENERATOR CONNECTED TO SAID COUNTER, SWITCHING UNIT, AND MEMORY FOR CONTROLLING THE OPERATION THEREOF.