Concomitant inband signaling for data communications over digital wireless telecommunications network
First Claim
1. A concomitant inband signaling modem system for communicating digital data over a voice channel of a wireless telecommunications network, comprising:
- a wireless network access device;
a first inband signaling modem that transmits data using a first audio tone having a first frequency and a second audio tone having a second frequency;
a second inband signaling modem that receives data using a first audio tone having a first frequency and a second audio tone having a second frequency;
a first codec to convert analog voice signals to digital audio data;
a second codec to convert digital audio data to analog voice signals;
a voice activity detector providing a voice activity indicator;
a controller that controls when the sending inband signaling modem transmits data based on the voice activity indicator.
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Abstract
Systems and methods are described to use an inband signaling modem to communicate digital data over a voice channel of a wireless telecommunications network, while simultaneously maintaining the ability to support a voice conversation. An inband signaling modem receives digital data. A voice activity detector receives a digitized voice signal from a codec. The voice activity detector outputs an indication of the degree of confidence that speech is present in the digitized voice signal. If the indication denotes that speech is not present, the inband signaling modem encodes the digital data into audio tones. The synthesized audio tones are sent to a voice channel of a wireless telecommunications network. If the voice activity detector indicates that speech is present, the digitized voice signal is sent to the voice channel of a wireless telecommunications network.
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Citations
17 Claims
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1. A concomitant inband signaling modem system for communicating digital data over a voice channel of a wireless telecommunications network, comprising:
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a wireless network access device;
a first inband signaling modem that transmits data using a first audio tone having a first frequency and a second audio tone having a second frequency;
a second inband signaling modem that receives data using a first audio tone having a first frequency and a second audio tone having a second frequency;
a first codec to convert analog voice signals to digital audio data;
a second codec to convert digital audio data to analog voice signals;
a voice activity detector providing a voice activity indicator;
a controller that controls when the sending inband signaling modem transmits data based on the voice activity indicator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A concomitant inband signaling modem system for bidirectional digital data communication over a voice channel of a wireless telecommunications network, comprising:
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a wireless network access device;
a first multichannel inband signaling modem;
a second multichannel inband signaling modem;
a first codec to convert between analog voice signals and digital audio data;
a second codec to convert between analog voice signals and digital audio data;
a first voice activity detector providing a first voice activity indicator;
a second voice activity detector providing a second voice activity indicator;
a first controller that controls when the first multichannel inband signaling modem transmits data based on the first voice activity indicator;
a second controller that controls when the second multichannel inband signaling modem transmits data based on the second voice activity indicator;
a first modem activity detector providing a first modem activity indicator;
a second modem activity detector providing a second modem activity indicator;
a third controller that controls when the audio to the first codec is muted based on the first modem activity indicator;
a fourth controller that controls when the audio to the second codec is muted based on the second modem activity indicator.
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12. A method of digital data transfer through the voice channel of a digital wireless network concomitantly with a voice conversation and without interrupting the voice conversation, comprising the steps of:
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receiving digitally encoded voice data;
receiving digital data for transmission in the voice channel of a call;
detecting whether or not voice activity is currently present in the digitally encoded voice data; and
if voice activity is not currently detected in the digitally encoded voice data, transmitting the digital data in the voice channel of the call. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification