Synchronous frequency modulation of digital data
阅读：648发布：2023-05-19
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1. A METHOD OF SYNCHRONOUSLY CONVERTING A DIGITAL WAVEFORM HAVING A SERIES OF PULSES OF TWO DISCRETE AMPLITUDE LEVELS AND A GIVEN BIT RATE TO FREQUENCY MODULATED PULSES INDICATIVE OF SAID DIGITAL WAVEFORM, COMPRISING DIGITALLY DIFFERENTIATING SAID DIGITAL WAVEFORM AND A SERIES OF ASSOCIATED CLOCK PULSES HAVING A CLOCK RATE EQUAL TO THE BIT RATE OF THE PULSES OF SAID WAVEFORM TO THEREBY PRODUCE A DIGITAL DIFFERENTIAL OF SAID WAVEFORM INCLUDING A SERIES OF PULSES VARYING BETWEEN TWO DISCRETE AMPLITUDE LEVELS, DIGITALLY COMBINING SAID DIGITAL DIFFERENTIAL WITH A SECOND SERIES OF CLOCK PULSES AT THE SAME CLOCK RATE AS SAID FIRST SERIES OF CLOCK PULSES AND SHIFTED 180* IN PHASE RELATIVE THERETO TO GENERATE OUTPUT PULSES IN TIME CORRESPONDENCE WITH SAID SECOND SERIES OF CLOCK PULSES WHEN SAME COINCIDE IN TIME WITH PORTIONS OF THE PULSES OF SAID DIFFERENTIAL AT ONE OF THE AMPLITUDE LEVELS THEREOF AND TO GENERATE NO OUTPUT PULSES WHEN THE SECOND SERIES OF CLOCK PULSES COINCIDE IN TIME WITH PORTIONS OF THE PULSES OF SAID SAID DIFFERENTIAL AT THE OTHER OF THE AMPLITUDE LEVELS THEREOF, AND COMPLEMENTING SAID OUTPUT PULSES AND SAID FIRST SERIES OF CLOCK PULSES TO THEREBY PRODUCE FREQUENCY MODULATED PULSES CHANGING BETWEEN AN UPPER FREQUENCY NUMERICALLY EQUAL TO SAID CLOCK RATE AND A LOWER FREQUENCY NUMERICALLY EQUAL TO ONE-HALF SAID CLOCK RATE, AND PASSING FREQUENCY COMPONENTS OF SAID FREQUENCY MODULATED PULSES IN A BAND DEFINED BETWEEN SAID UPPER AND LOWER FREQUENCIES WHILE SUPPRESSING FREQUENCY COMPONENTS OUTSIDE OF SAID BAND TO PRODUCE A SINUSOIDAL FREQUENCY MODULATED WAVE WHEREIN A FREQUENCY MIDWAY BETWEEN SAID UPPER AND LOWER FREQUENCIES IS REPRESENTATIVE OF SAID FIRST AMPLITUDE LEVEL OF SAID DIGITAL WAVEFORM AND SAID UPPER AND LOWER FREQUENCIES ARE REPRESENTATIVE OF SAID SECOND AMPLITUDE LEVEL OF SAID DIGITAL WAVEFORM.
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