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High pass filtering with automatic phase equalization

  • US 6,271,778 B1
  • Filed: 01/15/2000
  • Issued: 08/07/2001
  • Est. Priority Date: 01/15/2000
  • Status: Expired due to Term
First Claim
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1. Apparatus for providing selective high pass filtering of two associated digital signals, the apparatus comprising:

  • a first signal processing module that receives a first digital signal and passes the first signal through a first filtering module, through a second filtering module or through a third filtering module, depending upon the value of a switching command, to produce a first filtered signal;

    a second signal processing module that receives a second digital signal and passes the second signal through a fourth filtering module, through a fifth filtering module or through a sixth filtering module, depending upon the value of the switching command, to produce a second filtered signal; and

    wherein the first and fourth filtering modules comprise substantially identical high pass filters, the second and fifth filter modules comprise substantially identical all-pass filters, and the third and sixth filtering modules provide no filtering of a signal, and wherein the first and second signals may be passed through the following pairs of filter modules;

    first and fourth filter modules, second and fourth filter modules, first and fifth filter modules, and third and sixth filter modules.

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