METHOD FOR DATA COMMUNICATION VIA A VOICE CHANNEL OF A WIRELESS COMMUNICATION NETWORK USING CONTINUOUS SIGNAL MODULATION
First Claim
1. A method of sending data between a vehicle and central facility over a wireless communication system, comprising the steps of:
- encoding data sent in either direction between the vehicle and central facility using continuous signal modulation of a carrier signal such that the modulated carrier signal contains no more than four significant frequency components; and
transferring the modulated carrier signal between the vehicle and central facility using a newer generation EVRC vocoder.
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Accused Products
Abstract
A system and method for data communication over a cellular communications network that allows the transmission of digital data over a voice channel using a vocoder that monitors parameters of a Levinson Durbin recursion and then uses full rate CELP if the monitored prediction error falls to below a predetermined threshold within a pre-selected number of iterations of the recursion. The system and method encode digital data to be transmitted using a continuous signal modulation technique at a selected bit rate and one or more frequencies that are selected such that the resulting modulated carrier signal is processed by the vocoder using full rate CELP as a result of the monitored prediction error.
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Citations
25 Claims
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1. A method of sending data between a vehicle and central facility over a wireless communication system, comprising the steps of:
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encoding data sent in either direction between the vehicle and central facility using continuous signal modulation of a carrier signal such that the modulated carrier signal contains no more than four significant frequency components; and transferring the modulated carrier signal between the vehicle and central facility using a newer generation EVRC vocoder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of exchanging data over a wireless communication system which uses a vocoder in each direction to encode an inputted audio stream using a vocoder that encodes speech segments by determining an approximation of the speech segment, selecting between a full bit rate and one or more slower bit rates based at least in part on an error calculation relating to the difference between the approximation and the speech segment, and generating an encoded speech segment using the approximation and selected bit rate, wherein the method comprises the steps of:
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encoding data sent in each direction using continuous signal modulation of a carrier signal at a selected modulation bit rate and one or more frequencies such that the vocoder selects the full bit rate based on the error calculation; sending the modulated carrier signal over the wireless communication system; receiving the modulated carrier signal; and demodulating the modulated carrier signal back into the data. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of exchanging data over a wireless communication system which uses a vocoder in each direction to encode an inputted audio stream using a CELP codec that determines a predictor using a Levinson Durbin recursion that generates predictor coefficients, wherein encoding of the speech occurs at a bit rate selected at least in part based on a prediction error that is calculated for each of a number of iterations of the Levinson Durbin recursion, the method comprising the steps of:
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encoding first data into a first audio stream that is inputted into the vocoder used for transmission in a first direction over the wireless communication system, wherein the encoding of the first data is carried out using continuous signal modulation of a first carrier signal at a first frequency and selected modulation bit rate such that the prediction error for the first modulated carrier signal falls below a predetermined threshold within a preselected number of iterations of the Levinson Durbin recursion; sending the first modulated carrier signal over the wireless communication system; receiving the first modulated carrier signal; demodulating the first modulated carrier signal back into the first data; encoding second data into a second audio stream that is inputted into the vocoder used for transmission in a second direction over the wireless communication system, wherein the encoding of the second data is carried out using continuous signal modulation of a second carrier signal at a second frequency and selected modulation bit rate such that the prediction error for the second modulated carrier signal falls below the predetermined threshold within the preselected number of iterations of the Levinson Durbin recursion; sending the second modulated carrier signal over the wireless communication system; receiving the second modulated carrier signal; and demodulating the second modulated carrier signal back into the second data.
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Specification