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Enhanced Conversion of Wideband Signals to Narrowband Signals

  • US 20070162279A1
  • Filed: 09/22/2006
  • Published: 07/12/2007
  • Est. Priority Date: 01/24/2001
  • Status: Active Grant
First Claim
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1. An apparatus for converting a wideband speech signal into a narrowband speech signal, comprising:

  • a control element for determining whether to convert the wideband speech signal into the narrowband speech signal;

    a switch coupled to the control element, wherein the control element activates the switch if the control element determines that the wideband speech signal will be converted;

    a bandwidth switching filter for receiving the wideband speech signal if the switch is activated, wherein the bandwidth switching filter emphasizes a portion of the frequency spectrum of the wideband speech signal to produce an output signal with a non-flat frequency spectrum; and

    a down sampler for decimating the output signal of the bandwidth switching filter.

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