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VOICE TRANSMISSION AND RECEIVING SYSTEM EMPLOYING PULSE DURATION MODULATIONS WITH A SUPPRESSED CLOCK

  • US 3,667,046 A
  • Filed: 10/09/1969
  • Issued: 05/30/1972
  • Est. Priority Date: 10/09/1969
  • Status: Expired due to Term
First Claim
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1. A system for coding analog information, including first means responsive to the analog information for producing a clocked pulse amplitude modulated (PAM) signal representative of the analog information, second means coupled to the first means and responsive to the clocked PAM signal for producing a clocked pulse duration modulated (PDM) signal representative of the clocked PAM signal, and third means coupled to the second means and responsive to the clocked PDM signal for suppressing the clock to produce a suppressed clock PDM signal representative of the clocked PDM signal.

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