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US Patent 7710948 PCM-based data transmission system and voice/data communication switching method

Patent 7710948 was granted and assigned to NEC Corporation on May, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A transmitting terminal creates a data PCM stream in which data is recognized as a PCM stream by placing a prefixed idle code string before data to transmit and a postfixed idle code string after the data to transmit. By switching between a voice PCM stream and a data PCM stream, PCM steam is transmitted to a receiving terminal. The receiving terminal, when detecting the prefixed idle code string from a received PCM stream, receive the data from the transmitting terminal until detecting the postfixed idle code string.

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