Method and apparatus for transmitting and receiving data using continuous tone control squelch system
First Claim
1. A method for transmitting and receiving data using a continuous tone control squelch system (CTCSS), comprising the steps of:
- a) dividing an effective frequency band of said CTCSS into regular intervals, setting the divided intervals as channels and assigning data code values respectively to the set channels;
b) for data transmission, successively transmitting CTCSS frequency signals corresponding respectively to code values of specific data; and
c) for data reception, converting successively received CTCSS frequency signals into corresponding data code values, respectively.
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Accused Products
Abstract
A method and apparatus for transmitting and receiving data using a continuous tone control squelch system (CTCSS), which can transmit and receive data simultaneously with voice communication using the CTCSS. The apparatus is capable of transmitting and receiving a global positioning system (GPS) data signal containing a position value together with a voice signal using the CTCSS by a wireless communication terminal. Therefore, a user of the terminal can notify another party of his or her current position while conducting a voice conversation therewith. The method comprises dividing an effective frequency band of the CTCSS into regular intervals, setting the divided intervals as channels and assigning data code values respectively to the set channels. For data transmission, CTCSS frequency signals corresponding respectively to code values of specific data are successively transmitted. For data reception, successively received CTCSS frequency signals are converted into corresponding data code values, respectively. In this manner, data can be transmitted and received together with a voice signal.
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Citations
9 Claims
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1. A method for transmitting and receiving data using a continuous tone control squelch system (CTCSS), comprising the steps of:
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a) dividing an effective frequency band of said CTCSS into regular intervals, setting the divided intervals as channels and assigning data code values respectively to the set channels;
b) for data transmission, successively transmitting CTCSS frequency signals corresponding respectively to code values of specific data; and
c) for data reception, converting successively received CTCSS frequency signals into corresponding data code values, respectively. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for transmitting and receiving data using a continuous tone control squelch system (CTCSS) by a first wireless communication terminal one-to-one communicating with a second wireless communication terminal, said first and second wireless communication terminals being the same in construction, said apparatus comprising:
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transmitter means including a first data processor for converting specific data to be transmitted into CTCSS frequency signals on the basis of a pre-registered CTCSS frequencies-by-codes table, a CTCSS frequency generator for generating the converted CTCSS frequency signals under control of said first data processor, and a radio transmitter for mixing said CTCSS frequency signals from said CTCSS frequency generator with a voice signal from said first wireless communication terminal and transmitting the mixed result to said second wireless communication terminal over a predetermined carrier; and
receiver means including a radio receiver for receiving a carrier signal containing CTCSS frequency signals and a voice signal from said second wireless communication terminal and separating the CTCSS frequency signals and voice signal from the received carrier signal, a CTCSS frequency discriminator for discriminating which frequencies of said pre-registered CTCSS frequencies-by-codes table are channel frequencies of said CTCSS frequency signals separated by said radio receiver, and a second data processor for converting said CTCSS frequency signals separated by said radio receiver into the original data on the basis of the pre-registered CTCSS frequencies-by-codes table and the results discriminated by said CTCSS frequency discriminator. - View Dependent Claims (7, 8, 9)
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Specification