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Modem with low part count and improved demodulator

  • US 4,431,867 A
  • Filed: 12/13/1982
  • Issued: 02/14/1984
  • Est. Priority Date: 06/15/1981
  • Status: Expired due to Term
First Claim
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1. In a data communications adapter including means for coupling a telephone line to a first point in a signal path, said first point being an input point to a filter network, said filter network including an output, and a decoding means for decoding signals from said telephone line, the improvement comprising in combination:

  • a first impedance connecting said first point to a second point;

    means for connecting said output of said filter network to a third point and for providing a low output impedance at said third point;

    a second impedance connecting said second point and said third point;

    wherein said first impedance, said second impedance and said output impedance provide a low pass function between said first point and said second point; and

    said output impedance and said second impedance provide a high pass function between said output of said filter network and said second point; and

    means connecting said second point and said decoding means.

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