METHODS FOR IN-BAND SIGNALING THROUGH ENHANCED VARIABLE-RATE CODECS
First Claim
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1. A method for transmitting digital data in a voice channel connection of a digital wireless telecommunication system, the method comprising:
- receiving digital input data;
encoding the digital input data into a series of audio frequency tones;
assembling the series of audio frequency tones into a data burst;
applying a selected windowing function to the data burst, the windowing function comprising a tapered leading edge followed by a substantially constant amplitude data region, so as to form a windowed waveform burst having a substantially constant amplitude data region that includes the data burst; and
inputting the windowed waveform burst to a transmission side vocoder for transmission over the voice channel connection of a digital wireless telecommunication system.
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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, some employing tapered waveforms, 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. These features can be used in cell phones or other wireless communication devices, including automotive applications.
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Citations
14 Claims
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1. A method for transmitting digital data in a voice channel connection of a digital wireless telecommunication system, the method comprising:
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receiving digital input data; encoding the digital input data into a series of audio frequency tones; assembling the series of audio frequency tones into a data burst; applying a selected windowing function to the data burst, the windowing function comprising a tapered leading edge followed by a substantially constant amplitude data region, so as to form a windowed waveform burst having a substantially constant amplitude data region that includes the data burst; and inputting the windowed waveform burst to a transmission side vocoder for transmission over the voice channel connection of a digital wireless telecommunication system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An in-band signaling modem for use in a digital wireless telecommunications device to send data over a voice channel of a digital wireless telecommunications network, the in-band signaling modem comprising:
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software stored in a memory in the wireless telecommunications device, the software executable in a processor in the wireless telecommunications device; the software configured to control the processor to receive digital input data; encode the digital input data into a series of audio frequency tones; assemble the series of audio frequency tones into a data burst; apply a selected windowing function to the data burst, the windowing function comprising a tapered leading edge followed by a substantially constant amplitude data region, so as to form a windowed waveform burst having a substantially constant amplitude data region that includes the data burst; and output the windowed waveform burst to a transmission side vocoder for transmission over the voice channel connection of a digital wireless telecommunication system. - View Dependent Claims (11, 12, 13, 14)
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Specification