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Speech and data multiplexor optimized for use over impaired and bandwidth restricted analog channels

  • US 4,757,495 A
  • Filed: 03/05/1986
  • Issued: 07/12/1988
  • Est. Priority Date: 03/05/1986
  • Status: Expired due to Term
First Claim
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1. A speech and data multiplexor for use over imparied and bandwidth restricted analog channels or digital representative of such channels, said multiplexor comprising,allocating means for alllocating a speech sub-band in a central poriton of the available bandwidth for the transmission of speech,selecting means for selecting at least one data sub-band, within the available bandwidth and on a border of the speech sub-band and in a portion of the available bandwidth separate and distinct from the portion of the bandwidth containing the speech sub-band, for the transmission of data,said analog channel being an analog channel of the kind in which impairments of induced noise, attenuation and/or group delay are common in the data sub-band, andadaptive means for adapting the transmission of the data in the data sub-band to any impairments existing in the data sub-band and independent of any speech signals and/or channel impairments existing or occurring in the speech sub-band and effective to optimize the transmission of data in the data sub-band in the presence of said impairments in the data sub-band and within the limt of the power available or allocated for the transmission.

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