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Applications of simultaneous analog and digital communication

  • US 5,440,585 A
  • Filed: 06/14/1993
  • Issued: 08/08/1995
  • Est. Priority Date: 06/14/1993
  • Status: Expired due to Term
First Claim
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1. A modem comprising:

  • a signal mapper having digital signals applied to the mapper at a digital port and analog signals applied to the mapper at an analog port, said mapper developing a plurality of mapped output signals related to said digital signals and to said analog signals,a modulator, responsive to the output signals of the signal mapper, for developing a modulated output signal at an output port of the modulator, said modulated output signal occupying an N-dimensional signal space that is composed of a plurality of N-dimensional mutually exclusive spaces, N being greater than 1, with a predetermined point in the each of the plurality of spaces associated with a digital symbol applied to said mapper via the applied digital signal, where a digital symbol is defined by a collection of bits contained in the applied digital signal, and other points in each of the plurality of spaces associated with the analog signals applied to said signal mapper simultaneously with the applied digital signal, andswitch means interposed between an output port of the modem and the modulator output port, and responsive to an operational state of the modem, for connecting the modem output port to the modulator output port when the operational state of the modem indicates the presence of a predetermined condition and for connecting the modem output port to the analog port when the operational state of the modem indicates the absence of said predetermined condition, where the operational state of the modem is the collection of signal conditions in electronic circuits making up the modem.

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