Synchronizer for use with improved in-band signaling for data communications over digital wireless telecommunications networks
First Claim
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1. A system for communicating digital data over a voice channel of a digital telecommunications network comprising:
- an input for receiving digital data;
a processor for converting the digital data into audio tones; and
an output for outputting the audio tones to digital transmission circuitry that encodes the audio tones in a same manner used for encoding voice signals and transmits the encoded audio tones over the same voice channel in the digital telecommunications network used for transmitting the voice signals.
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Abstract
An inband signaling modem communicates digital data over a voice channel of a wireless telecommunications network. An input receives digital data. An encoder converts the digital data into audio tones that synthesize frequency characteristics of human speech. The digital data is also encoded to prevent voice encoding circuitry in the telecommunications network from corrupting the synthesized audio tones representing the digital data. An output then outputs the synthesized audio tones to a voice channel of a digital wireless telecommunications network.
121 Citations
33 Claims
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1. A system for communicating digital data over a voice channel of a digital telecommunications network comprising:
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an input for receiving digital data;
a processor for converting the digital data into audio tones; and
an output for outputting the audio tones to digital transmission circuitry that encodes the audio tones in a same manner used for encoding voice signals and transmits the encoded audio tones over the same voice channel in the digital telecommunications network used for transmitting the voice signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A synchronizer, comprising:
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an input that samples first and second audio tones;
a demodulator that generates a synchronization value by comparing the samples of the first audio tone with the samples of the second audio tone; and
a synchronizer that synchronizes the demodulator by shifting a start time for the samples of the first and second audio tones until the demodulator generates an optimum synchronization value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A multichannel inband signaling modem for communicating digital data over a voice channel of a telecommunications network, comprising:
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an input for receiving digital data;
a first modulator that converts a first binary bit value in a first portion of the digital data into a first audio tone having a first frequency and converts a second binary bit value in the first portion of digital data into a second audio tone having a second frequency;
a second modulator that converts the first binary bit value in a second portion of the digital data into a third audio tone having a third frequency and converts the second binary bit value in the second portion of the digital data into a fourth audio tone having a fourth frequency; and
an output for outputting the audio tones over a voice channel of a digital wireless telecommunications network. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33)
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29. A multicarrier inband signaling modem for communicating digital data over a voice channel of a telecommunications network, comprising:
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an input for receiving digital data;
multiple modulators that each convert binary values at associated bit locations in the digital data into different audio tones; and
an output for outputting the audio tones over a voice channel of a digital telecommunications network.
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Specification