JPS61189481A - Clocking device - Google Patents

Abstract

PURPOSE:To supply always precise clocking information even if noises or voices having the same frequency as a correct time signal are received by receiving pre-time signal and a correct time signal generated from a broadcasting station and checking the arrival of the pre-time signal before the arrival of the correct time signal. CONSTITUTION:When pre-time signals are generated like 59'57'', 59'58'' and 59'59'' every second from the broadcasting station, a receiver 2 receives these pre-time signals from an antenna 7. Correct time signals are extracted from these received pre-time signals by a pre-time signal extracting circuit 3 and the correct time signals 8 are outputted. Since correct time signals 8 are respectively received after 1sec from these three pre-time signals 9 every second, a correct signal generating circuit 5 decides that the correct time signals 8 are correct time and outputs time corrected signals 10 to a clocking circuit 6. Even if sound included in voices or music and having the same frequency as that of the correct time signals is received and the correct time signals 8 are transmitted, the circuit 5 does not regard the signals 8 as correct time because the pre-time signal 9 has not been previously inputted. Thus, the always precise time information can be supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time device that corrects the time using a standard time signal transmitted from a broadcasting station and supplies accurate time information.

[Conventional technology]

Conventionally, this type of time device has corrected the time by extracting only the hourly signal from the standard time signal.

[Problem that the invention seeks to solve]

Therefore, this conventional time device cannot supply accurate time information because there is a risk that noise or voice on the same frequency as the hourly signal may be mistaken for the hourly signal and the time may be corrected. There was a drawback.

An object of the present invention is to provide a time device that reliably corrects the time only with the standard time signal and supplies accurate time information synchronized with the standard time.

[Means for solving problems]

The present invention receives the standard time signal and the hour signal issued by a broadcasting station, checks that the forecast signal comes before the hour signal, corrects the time only with the correct time signal, and eliminates noise. This prevents the user from accidentally adjusting the time due to audio or voice.

That is, the time device of the present invention includes a receiver that receives a time signal transmitted from a broadcasting station, and a receiver that extracts the hour signal and the forecast signal from the time signal received by this receiver and outputs the hour signal and the forecast signal. a time correction signal generation circuit that determines that a correct hour signal has been received and generates a time correction signal when the hour signal is inputted following the prediction signal; It is equipped with a timekeeping circuit that corrects the time based on signals.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a time device according to the present invention.

The time device 1 of this embodiment includes a receiver 2 (for example, an AM or FM receiver) that receives a time signal issued from a broadcasting station;
The hourly signal extraction circuit 8 extracts the hourly signal and outputs the hourly signal 8; the forecasting signal extraction circuit 4 extracts the forecasting signal and outputs the forecasting signal 9; 8, a time correction signal generation circuit 5 determines that a correct hourly signal has been received and issues a time correction signal IO, and a time correction signal 10 that corrects the time, displays the time, and transmits the time information to other devices. It is composed of a clock circuit 6 that supplies .

Next, the operation of this embodiment will be explained with reference to the time chart of FIG.

The broadcast station sends a forecast signal (for example, 440Hz) at time 59'1.
57', 59'158'? 59'159' are issued at 1 second intervals, the receiver 2 receives these forecast times through the antenna 7. These received forecast time signals are extracted by a forecast time signal extraction circuit 4, and a forecast time signal 9 is output. Next, the hourly signal is extracted at times 0σ and 00', and the hourly signal is generated as the hourly signal 8.
is output. The corrected hourly signal 8 is determined to be a correct time signal, and a time correction signal 10 is output to the clock circuit 6.

Even if a sound with the same frequency as the hourly signal included in voice or music is received, extracted by the hourly signal extracting circuit 8, and the hourly signal 8 is sent out, the correction signal generating circuit 5 inputs the forecasting hourly signal 9 before that. Since this is not done, it is not regarded as an hourly signal and the time correction signal 10 is not output.

〔Effect of the invention〕

As explained above, the present invention corrects the time only when the hourly signal is received following the forecast hourly signal, thereby correcting the time even when noise or voice having the same frequency as the hourly signal is received. The time is never incorrectly corrected (accurate time information can always be provided).

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a time device according to the present invention, and FIG. 2 is a time chart of time adjustment in the time device shown in the figure. 1...Time device. 2...Receiver. 3... Hourly signal extraction circuit. 4...Forecast signal extraction circuit. 5... Correction signal generation circuit. 6...Clock circuit. 8... Hourly signal. 9...Prediction signal. 10...Time adjustment signal. ■ 1:0 9 or N thunder

Claims (1)

[Scope of Claims] A time device that corrects the time using a standard time signal transmitted from a broadcasting station and supplies accurate time information, the receiver receiving the time signal transmitted from the broadcasting station; An hour signal extraction circuit and a forecast signal extraction circuit that extract the hour signal and the forecast signal from the time signal received by the receiver and output the hour signal and the forecast signal, respectively, and input the hour signal after the forecast signal. What is claimed is: 1. A time device comprising: a time adjustment signal generating circuit that determines that a correct hourly signal has been received when the hour is correct and generates a time adjustment signal; and a timekeeping circuit that adjusts the time based on the time adjustment signal.