Multichannel in-band signaling for data communications over digital wireless telecommunications networks

• US 6,493,338 B1
• Filed: 06/22/2000
• Issued: 12/10/2002
• Est. Priority Date: 05/19/1997
• Status: Expired due to Term

• Current Assignee: Karma Automotive LLC (Wanxiang Group Corporation)
• Original Assignee: Airbiquity Incorporated
• Inventors: Preston, Dan A., Preston, Joseph D., Leyendecker, Robert, Eatherly, Wayne, Proctor, Rod L., Smith, Philip R.
• Primary Examiner(s): Marcelo, Melvin
• Assistant Examiner(s): MEHRA, INDER P
• Application Number:
  US09/602,593
• Time in Patent Office: 901 Days
• Field of Search: 370/276, 370/281, 370/487, 370/490, 370/493, 370/494, 370/495, 370/352, 370/522, 370/527, 370/529, 375/222, 375/272, 375/303, 375/275, 379/90.01, 379/93.05, 379/93.28, 332/100
• US Class Current: 370/352
• CPC Class Codes: G01S 2205/002 for traffic control, mobile tracking, guidance, surveillance or anti-collision
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: G08G 1/127 to a central station ; Indicators in a central station
• CPC Class Codes: G10L 19/00 Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis in musical instruments G10H
• CPC Class Codes: H04M 11/04 with alarm systems, e.g. fire, police or burglar alarm systems

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.

Claims

1. A multichannelinband signaling modem for communicating digital data over a voice channel of a telecommunications network, comprising:

an input for receiving outbound digital data;

a first modulator that converts a first binary bit value in a first portion of the outbound digital data into an outbound first audio tone having a first frequency and converts a second binary bit value in the first portion of the outbound digital data into an outbound second audio tone having a second frequency;

a second modulator that converts a first binary bit value in a second portion of the outbound digital data into an outbound third audio tone having a third frequency and converts a second binary bit value in the second portion of the outbound digital data into an outbound fourth audio tone having a fourth frequency;

a bi-directional port for outputting and receiving audio tones over the voice channel of the telecommunications network;

a first decoder that is coupled to the port and monitors for inbound first and second audio tones and converts any detected inbound first audio tones into a first binary bit value of a first portion of inbound digital data and converts any detected inbound second audio tones into a second binary bit value of the first portion of inbound digital data;

a second decoder that is coupled to the port and monitors for inbound third and fourth audio tones and converts any detected inbound third audio tones into a first binary bit value of a second portion of inbound digital data and converts any detected inbound fourth audio tones into a second binary bit value of the second portion of inbound digital data; and

a controller that controls when the first and second modulators generate outbound audio tones and when the first and second decoders monitor for inbound audio tones.

2. A modem according to claim 1 wherein the controller conducts a configuration session with another multichannel inband signaling modem.

3. A modem according to claim 1 wherein the controller controls which bits in the outbound digital data are converted into outbound audio tones by the first and second modulators.

4. A multichannel inband signaling modem for communicating digital data over a voice channel of a telecommunications network, comprising:

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 the 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;

wherein the audio tones are fed into a same analog to digital converter in a cell phone that processes human voice signals; and

an output port for outputting the audio tones over the voice channel of the telecommunications network.

5. A multichannel inband signaling modem for communicating digital data over a voice channel of a telecommunications network, comprising:

an input for receiving outbound digital data;

a first modulator, in a cellular phone, that converts a first binary bit value in a first portion of the outbound digital data into an outbound first audio tone having a first frequency and converts a second binary bit value in the first portion of the outbound digital data into an outbound second audio tone having a second frequency;

a second modulator, in the cellular phone, that converts a first binary bit value in a second portion of the outbound digital data into an outbound third audio tone having a third frequency and converts a second binary bit value in the second portion of the outbound digital data into an outbound fourth audio tone having a fourth frequency;

a bi-directional port for outputting the outbound audio tones over the voice channel of the telecommunications network and receiving inbound audio tones over the voice channel;

a first decoder, in the cellular phone, coupled to the port that monitors for inbound first and second audio tones and converts any detected inbound first audio tones into a first binary bit value of a first portion of inbound digital data and converts any detected inbound second audio tones into a second binary bit value of the first portion of inbound digital data;

a second decoder, in the cellular phone, coupled to the port that monitors for inbound third and fourth audio tones and converts any detected inbound third audio tones into a first binary bit value of a second portion of inbound digital data and converts any detected inbound fourth audio tones into a second binary bit value of the second portion of inbound digital data.

6. A multichannel inband signaling modem for communicating digital data over a voice channel of a telecommunications network, comprising:

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 a first binary bit value in a second portion of the digital data into a third audio tone having a third frequency and converts a second binary bit value in the second portion of the digital data into a fourth audio tone having a fourth frequency; and

a digital to analog converter that converts the audio tones into analog signals that are input to a voice input of a telephone,encoded, and transmitted over the voice channel of the telecommunications network by voice processing circuitry in the telephone.