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TX preemphasis filter and TX power control based high speed two wire modem

  • US 5,463,661 A
  • Filed: 02/23/1995
  • Issued: 10/31/1995
  • Est. Priority Date: 02/23/1995
  • Status: Expired due to Term
First Claim
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1. A two-wire modem for, upon transmitting, for a first predetermined time segment, a first line probing signal of varying frequency content and varying power level/levels over communication media, selecting a carrier frequency and a symbol rate from a predetermined plurality of carrier frequencies and symbol rates, a transmitter preemphasis filter and a transmitter power level determined from estimated characteristics of said communication media, to communicate with another modem over said communication media in a full duplex mode, said two-wire modem comprising:

  • A) an echo and received signal analyzer for;

    receiving at least one echo signal of said first line probing signal of varying frequency content and varying power level/levels from said communication media in said first predetermined time segment and estimating echo characteristics of said communication media based on an analysis of said received at least one echo signal of said first line probing signal; and

    receiving a second line probing signal of varying frequency content and varying power level/levels from said communication media in a second predetermined time segment and estimating signal characteristics of said communication media based on an analysis of said received second line probing signal.andB) a TX preemphasis and TX power control processor, operably coupled to the echo and received signal analyzer, for selecting said carrier frequency and symbol rate from the predetermined plurality of carrier frequencies and symbol rates, the transmitter preemphasis filter from the plurality of predetermined transmitter preemphasis filters, and the transmitter power level using said estimates of the signal and echo characteristics of said communication media.

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