Methods for in-band signaling through enhanced variable-rate codecs
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United States of America Patent
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Jul 19, 2011
Grant Date -
Mar 18, 2010
app pub date -
Oct 15, 2008
filing date -
Sep 15, 2008
priority date (Note) -
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Abstract
Improvements are disclosed for in-band signaling, i.e., transmission of data in a voice channel of a digital wireless network during a voice call session. A family of narrow-band signaling methods is disclosed to successfully pass data-carrying signals through the low-bit rate modes of the EVRC-B vocoder commonly used in CDMA wireless channels. Some embodiments generate a tapered signaling waveform in tandem with another waveform using FSK-modulation. These features can be used in cell phones or other wireless communication devices, including automotive applications.
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