MOBILE RADIO COMMUNICATION TERMINAL INCORPORATING ELECTRONIC WAVE CLOCK

• Main Authors: WATANABE HIDEAKI, KUROSAWA KAZUHITO, SOMA ATSURO
• Format: Patent
• Language: English
• Published: 28.07.2000
• Edition: 7
• Subjects: ELECTRONIC TIME-PIECES; HOROLOGY; PHYSICS; RADIO-CONTROLLED TIME-PIECES

PROBLEM TO BE SOLVED: To correct time and to provide accurate time by incorporating a receiver with a long-wave standard electronic wave in a mobile radio communication terminal and achieving the function of an electronic wave clock. SOLUTION: A long-wave standard electronic wave is received by an antenna 1 for long wave and a reception low-noise amplifier(LNA) 2 for long wave, and a reference marker in a standard signal being received by a reception pulse extraction circuit 3 is detected and is sent to a time generation circuit 4 and a time difference measurement circuit 5 as a pulse signal. On the other hand, a clock 7 being generated from an oscillator 12 by an incorporated crystal oscillator is counted by a built-in clock and is sent to the measurement circuit 5 via a time signal generation circuit 6 for measurement. The difference between time from the standard electronic wave being received and time from the built-in clock is measured and is sent to a correction signal generation circuit 7, and a correction signal corresponding to the time difference is sent to the built-in clock, thus correcting time. Accurate time is displayed on a display 11 as an electronic wave clock also at the mobile radio communication terminal by the loop control.