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Alternate Mark Invert (AMI) transceiver with switchable detection and digital precompensation

  • US 4,584,690 A
  • Filed: 05/07/1984
  • Issued: 04/22/1986
  • Est. Priority Date: 05/07/1984
  • Status: Expired due to Fees
First Claim
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1. An apparatus for transmission and reception of digital data over a bandlimited channel comprising:

  • means for generating and transmitting a pure alternate mark invert pulse code (pure AMIPC, signal from a digital message signal, said pure AMIPC signal being free of bipolar violations; and

    means for receiving a signal representative of said pure AMIPC signal, said receiving means including means defining a first threshold and a second threshold, said first threshold for identifying positive polarity pulses of said pure AMIPC signal, and said second threshold for identifying negative polarity pulses of said pure AMIPC signal, said first threshold and said second threshold being substantially equal in amplitude, first detecting means coupled to said threshold defining means for only detecting a signal of an amplitude greater than said first threshold, second detecting means coupled to said threshold defining means for only detecting a signal of an amplitude greater than said second threshold, means for simultaneously enabling said first detecting means and said second detecting means until receipt of a first representative signal of arbitrary polarity, said enabling means also for disabling said first detecting means upon receipt of a representative signal of positive polarity until receipt of a representative signal of negative polarity and for disabling said second detecting means upon receipt of a representative signal of negative polarity until receipt of a representative signal of positive polarity and timing means, for establishing a pulse duration of a reconstructed pulse for each said representative signal of positive polarity and negative polarity, said pulse duration being independent of duration of said representative signal in order to minimize effects of intersymbol interference.

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