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 the 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 the digital wireless telecommunication system;
wherein the tapered leading edge of the windowing function gradually increases in amplitude from substantially zero amplitude to substantially a predetermined peak amplitude, over a first predetermined duration in a range of approximately one-half second to three seconds, so that the leading edge of the windowed waveform burst gradually increases in amplitude from substantially zero amplitude to substantially the predetermined peak amplitude, over the first predetermined duration.
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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
12 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 the 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 the digital wireless telecommunication system; wherein the tapered leading edge of the windowing function gradually increases in amplitude from substantially zero amplitude to substantially a predetermined peak amplitude, over a first predetermined duration in a range of approximately one-half second to three seconds, so that the leading edge of the windowed waveform burst gradually increases in amplitude from substantially zero amplitude to substantially the predetermined peak amplitude, over the first predetermined duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. 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 digital wireless telecommunications device, the software executable in a processor in the digital 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 the 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; wherein the tapered leading edge of the windowing function gradually increases in amplitude from substantially zero amplitude to substantially a predetermined peak amplitude, over a first predetermined duration in a range of approximately one-half second to three seconds, so that the leading edge of the windowed waveform burst gradually increases in amplitude from substantially zero amplitude to substantially the predetermined peak amplitude, over the first predetermined duration. - View Dependent Claims (10, 11, 12)
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Specification