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Video transmission system

  • US 4,742,543 A
  • Filed: 07/10/1986
  • Issued: 05/03/1988
  • Est. Priority Date: 12/22/1983
  • Status: Expired due to Fees
First Claim
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1. A method of transmitting an audio signal comprising the steps of:

  • (a) repetitively digitizing the audio signal to repetitively generate a digital portion and a respective remainder portion, wherein said digitizing is performed by sampling the audio signal at spaced instants in time and quantizing each audio sample to a certain number of spaced levels, the digital portion being the quantized audio sample, the remainder portion being approximately the difference between the audio signal and the digital portion at said spaced instants in time,(b) transmitting the digital portions and their respective remainder portions as a series of analog samples, the analog samples representing the digital portions being quantized to more than two levels, the analog samples representing the remainder portions having substantially more resolution than the resolution of the analog samples representing the digital portions, each remainder portion being transmitted as a single analog sample,(c) receiving the series of analog samples, quantizing the analog samples representing digital portions to generate quantized values, and adding the quantized values to values of the respective analog samples representing remainder portions to thereby generate a series of values representing the transmitted audio signal.

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