Method for in-band signaling of data over digital wireless telecommunications networks

• US 7,747,281 B2
• Filed: 01/07/2008
• Issued: 06/29/2010
• Est. Priority Date: 05/19/1997
• Status: Expired due to Fees

• Current Assignee: Karma Automotive LLC (Wanxiang Group Corporation)
• Original Assignee: Airbiquity Incorporated
• Inventors: Preston, Joseph, Eatherly, Wayne, Preston, Dan A., Proctor, Rod L., Leyendecker, Robert
• Primary Examiner(s): Bost, Dwayne
• Assistant Examiner(s): Mehra, Inder P
• Application Number:
  US11/970,433
• Publication Number:
  US 20080108389A1
• Time in Patent Office: 904 Days
• Field of Search: 370/352, 370/494, 370/512, 370/519, 370/328, 370/349, 370/493, 370/410, 370/522, 370/527, 370/529, 370/310, 370/503, 455/404.2, 455/556.1, 455/550.1, 455/557, 704/202, 704/208, 704/258, 704/262, 704/500
• US Class Current: 455/557
• 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: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G08G 1/127 to a central station ; Indicators in a central station
• CPC Class Codes: H04M 11/066 Telephone sets adapted for data transmision
• CPC Class Codes: H04W 88/181 Transcoding devices; Rate adaptation devices

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 portable device comprising:

a digital processor arranged to implement an in-band signaling modem for receiving digital data over a digital voice channel of a wireless communications network, the digital processor adapted to execute software, and the software stored in a computer-readable storage medium disposed in the portable device;

and wherein the software is arranged to implement

an input that receives voice signals over the digital voice channel of the wireless communications network;

a filter that detects synthesized tones representing the digital data that is interleaved with the voice signals transmitted over the digital voice channel, the synthesized tones synthesizing frequency characteristics of human speech and preventing voice encoding circuitry in the wireless telecommunications network from corrupting the digital data represented by the synthesized audio tones; and

a demodulator that converts the detected synthesized tones back into the represented digital data;

wherein the filter includes;

a first in-band filter for detecting signals outside of a predetermined synthesized tone frequency band;

a second out-of-band filter for detecting signals inside the synthesized tone frequency band; and

a comparator that compares the signals detected outside the synthesized tone frequency band with the signals detected inside the synthesized tone frequency band and identifies signals as synthesized tones when the compared value is greater than a selected value.

2. A portable device according to claim 1 wherein the digital processor comprises a signal-processing apparatus in the portable device.

3. A portable device according to claim 1 wherein the software is executable in a digital processor in the portable device and the portable device includes a transceiver for voice channel communications over a wireless communications network.