JPS62272183A - Automatic time correcting timepiece - Google Patents

Abstract

PURPOSE:To simplify the circuit constitution of a time correcting means by correcting the current time of a timepiece circuit part automatically at the start of the transmission of a specific broadcast radio wave. CONSTITUTION:A clock V1 of specific frequency generated by a clock generation part 1 is counted by a counting circuit part 2 and the current time is displayed on a time display part 3. A broadcast reception part 5 is so constituted as to receive a broadcast radio wave which begins to be transmitted again at specific time when the second digit of the standard timepiece of a broadcasting station is 0. A time correcting signal generation part 6 generates a time correcting signal V6 when obtaining a carrier detection signal V5 outputted at the time of the reception of the broadcast radio wave from the reception part 5 for 60XN seconds (N: positive integer except 0) from the rising of the signal V5. A time correction part 7 corrects the current time of the timepiece circuit part 4 to 0sec which is nearest with the signal V6. Thus, the circuit constitution of a time correcting means is simplified.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Technical Field] The present invention provides a time display system that automatically corrects the advance or lag of the displayed current time so that the accurate time is always displayed. It concerns self-correcting watches.

[Background Art] Conventionally, this type of automatic time correction clock that automatically adjusts the advance or lag of the current time displayed has been designed to automatically adjust the advance or lag of the displayed current time by extracting time signals from radio broadcasts or television broadcasts using a filter or the like. There was a device that corrected the current time to the hour, but there was a problem that the circuit configuration of the time signal extraction circuit that extracts only time signal No. 46 from the audio signal in case of disaster became complicated and the cost increased. If the content of the broadcast was audio No. 46 similar to the time signal, the time would be incorrectly adjusted and a large time error would occur, making it impractical.

[Object of the Invention I The present invention has been made in view of the above-mentioned points, and its purpose is to simplify the circuit configuration of the time adjustment means, reduce cost, and prevent malfunctions from occurring. The object of the present invention is to provide an automatic time correcting timepiece that can minimize time errors caused by malfunctions.

[OR'il of the Invention (Embodiment 1) Figure 1 shows an embodiment of the present invention.
The daily time error of the current time displayed on 53 is ±
It is equipped with a clock generating section 1 consisting of a crystal oscillation circuit or a power synchronization signal generating circuit that is sufficiently shorter than 30 seconds (for example, about ±1 second), and a predetermined frequency (for example, about ±1 second) generated by the clock generating section 1. 60Hz) clock V
A clock circuit section 4 that counts l in a counter circuit section 2 and displays the current time on a time display section 3, and a clock circuit section 4 that counts l in a counter circuit section 2 and displays the current time on a time display section 3. Specific broadcast radio waves for which transmission of broadcast radio waves is resumed when the second digit is 0 seconds (for example, NHK-7 Noo Broadcasting, NH
K TV broadcasting, other private sector TV broadcasting, etc.)
a carrier wave detection signal V output when a broadcast radio wave is received from the broadcast receiving section 5;
A time correction signal generator 6 that generates a time correction signal v6 when the carrier detection signal ■ is continuously obtained for 60XN seconds (N is a positive integer excluding 0) from the rising edge i) of
and a time adjustment section 7 that adjusts the current time of the clock circuit section 4 to the nearest 0 seconds using a time adjustment signal (6).
The current time is corrected by 11h.

Here, the time correction signal generation section 6 in the embodiment includes a change detection circuit 10 that detects the rise and fall of the carrier wave detection signal (2) and outputs a rise signal Vu and a fall signal Vd, and a change detection circuit 10 that detects the rise and fall of the carrier wave detection signal (2) and outputs a rise signal Vu and a fall signal Vd. A clock with a predetermined frequency outputted from the clock generator 1 is counted to perform a time-limited operation, and a falling signal Vd is
The timer circuit i#311, in which the time-limited operation is reset, and the time-up signal V output from the timer circuit 11
A pulse generating circuit 12 consisting of a monostable multi-vibration circuit which generates a time correction tE4-VG in synchronization with L is formed as a pulse generating circuit 12.

In the embodiment, since the broadcast receiving unit 5 is configured to receive broadcast radio waves whose transmission is resumed at a predetermined time when the second digit of the standard clock of broadcast Canada is 0 seconds, the timer time v111 The time limit set for is set to 60 seconds, but if the second digit is not 0 seconds, the specified time (for example, M seconds)
If the transmission of broadcast waves is started in , the time limit is 6
Set to 0-M seconds or 120-M seconds.

Further, when the second digit of the current time of the clock circuit section 4 is less than 30 seconds, the time adjustment unit 7 of the embodiment resets the second digit and below while leaving the hour digit and minute digit as is, and If it is more than a second, leave the hour digit as is and add 1 minute to the minute digit.
Although it is formed by an arithmetic control circuit that controls the counting circuit section 2 to reset the seconds digit and below, in another embodiment, the time error per day is a leading error sufficiently smaller than 30 seconds. The clock generator 1 of the clock circuit WS4
It is conceivable that the time adjustment unit 7 is formed by a counting control circuit that resets the second digit and below when the time adjustment signal 6 is input.
The clock generator 8SL of the clock circuit section 4 is formed so that the time error per day is a leading error sufficiently smaller than 30 seconds, and the second digit of the current time after the output of the carrier wave detection signal 2 first becomes 0 seconds. When this occurs, the operation of the clock generator 1 is stopped, or the input of the clock to the counting circuit 92 is stopped to stop the counting operation of the clock circuit section 4,
It is conceivable that the time adjustment section 7 is formed by a counting control circuit that restarts the counting operation when the time adjustment signal 6 is input.

The operation of the first embodiment will be explained below. Now, in the example, clock generation! The frequency error of the clock 1 generated by the IS1 is determined by the time display section 3 of the clock circuit section 4.
Although the daily advance or lag of the current time displayed on the If no correction is made, the time errors will gradually accumulate, resulting in a large time error. However, in this embodiment, the time is automatically adjusted based on the standard clock of the broadcasting station at the start of broadcasting, so the time error is not accumulated and '2I! If you set the time almost accurately (within an error of 30 seconds) immediately after turning on the power, the accuracy will always be around ±1 second, and the current time will be accurate and approximately match the standard clock of the broadcasting station that is the standard for time adjustment. Time display section 3
will be displayed. FIG. 2 is a time chart showing the time adjustment operation in the embodiment, and the specific operation of the embodiment will be described below. First, the receiving frequency of the broadcast receiving section 5 is determined by checking the reception state of the broadcast using earphones or the speaker 5a, and checking the receiving frequency of the broadcast radio wave (for example,
It is set and fixed to receive medium-wave NHK radio broadcasts. Thereafter, the broadcast receiving section 5 constantly receives this broadcast radio wave and outputs a carrier wave detection signal 5 as shown in FIG. 2(a) which becomes "H" level when the carrier wave is received. When the carrier wave detection signal 5 is at the H'' level, the reception display section 5b made of a light emitting diode displays that the broadcast radio waves are being received normally.In this case, the specific broadcast radio waves to be received are In the time correction signal generating section 6 to which this carrier wave detection signal (■), which may be set to the radio wave of the broadcasting station with the strongest electric field strength, is input, the rise of the carrier wave detection signal (■5) is detected by the change detection circuit 10, The time-limiting operation of the timer circuit 11 is started in synchronization with the rising 9 signal Vu shown in FIG. The time-up signal Vi shown in FIG. 2(d) is output from the timer circuit 11, and this time-up signal (No.
The time adjustment signal as shown in Fig. 2(e) is synchronized with
6 is output from the pulse generation circuit 12.

On the other hand, as shown at the rear end of the time chart in Figure 2,
When a noise signal is received from time tol to time t, l, the rising edge 1) Signal Vu is output and the timer circuit 1
After the time limit operation 1 starts, the falling signal Vd is output while the time-up signal 2 is not output, and the time limit operation of the timer circuit 11 is immediately reset, and the timer circuit 11 starts the next rising signal. The device is in a standby state until Vu is obtained, and the time adjustment signal 6 is not generated. In other words, if the carrier wave detection signal 5 is obtained for a short time of 60 seconds or less, it is considered to be a noise signal when the broadcasting station's broadcast wave transmission is stopped and is canceled. 1. It is designed to prevent malfunctions caused by transient noise such as transceiver interference noise. By the way, when the time adjustment signal (2) generated by the time adjustment signal generation section 6 is input to the time adjustment section 7, the calculation control section changes the current time displayed on the time display section 3 of the clock circuit section 4. If the seconds digit is less than 30 seconds, leave the hour digits and minutes digits as they are and reset the seconds digits below.
When the second digit is 30 seconds or more, the counter circuit unit 2 is controlled to leave the hour digit unchanged, add one minute to the minute digit, and reset the seconds digit and below. The second digit is corrected to the nearest 0 seconds, and this correction allows the current time of the clock circuit section 4 to approximately match the current time of the standard clock of the broadcasting station transmitting the broadcast radio waves. It will be possible. For example, on time (5:00:00)
When the reception frequency of the broadcast receiving unit 5 is set to receive NHK radio broadcasts that start broadcasting at The carrier wave detection signal (g. The time correction signal 6 is output at the time when the time is set.

When this time adjustment signal 7 is input to the time adjustment section 7,
The current time (5:0101 to 4:59:59) displayed on the time display section 3 of the clock circuit section 4 is determined by resetting the counter below the seconds digit of the counting circuit section 2.

Corrected to O. Therefore, the current time displayed on the time display section 3 of the clock circuit flls4 is automatically corrected based on the 5 quasi-clock of the broadcasting station when the broadcasting station starts broadcasting, so that the current time is always accurate (in the embodiment). The time error per day is always about ±1 hour).

It goes without saying that the time display section 3 does not need to display seconds.

In addition, since the second digit of the clock circuit section 4 is corrected to the nearest 0 seconds by the time correction signal v6, the maximum correction width is always 30 seconds.
If the time difference is less than 30 seconds and no correction is made for more than 30 seconds, and if the broadcast radio waves are interrupted at a time other than the scheduled time due to a power outage at the broadcasting station or otherwise malfunctions, the time error is within 30 seconds and the next day's scheduled broadcast will be broadcast. At the beginning, the probability of being modified by α is large, and
Even if the correction is not made, the time lag at the time of the next day's time adjustment will be only one minute, and the time lag due to one malfunction will be minimized, resulting in almost no inconvenience in daily life. Furthermore, if the time during which time can be adjusted is set appropriately, malfunctions in time adjustment can be significantly reduced. In addition, the above-mentioned time adjustment possible time is, for example, when using a clock V with a time error of about ±1 second per day, when the second digit of the time display section 3 of the clock circuit section 4 is 58 seconds or more or 2 seconds or more. It suffices to set the value to a range less than or equal to the time error (approximately twice the time error per day).

(Embodiment 2) FIG. 3 shows another embodiment, in which the operation time of the broadcast receiving section 5 and the time adjustment I 3 all generation 6 is a certain period T (for example, 1 o ± 2 to 5 minutes) is provided.
By limiting the time during which time can be adjusted to about 4 to 10 minutes, malfunctions are less likely to occur and power consumption is reduced. An automatic setting section 9 is provided which operates the signal generating section 6 continuously and automatically sets the time adjustment possible time based on the time adjustment signal 6 outputted at the start of broadcasting the next morning. In addition, when it is acceptable to increase the error by 1 (for example, when the allowable time error is 1
~several seconds), the day or day of the week may be set in the time setting section for setting the operation time of the operation control section 8, and the time adjustment operation may be performed approximately once every two days to one week.

The operation of this embodiment will be explained below. Now, the broadcast receiving section 5 and the correction signal generating section 6 are operating continuously immediately after the power is turned on, and the next morning's broadcast start time t is reached. The time correction signal v6 is obtained at time t, one minute after. At this time, the automatic setting unit 9 determines the broadcast start time t0 based on the time L1 of occurrence of <No. 6, and sets the broadcast start time as shown in FIG. 2U.

and includes a certain period T of ~L (for example, 4:58:00
The on/off time of the operation control unit 8 is set so that the broadcast reception unit 5 and the broadcast start detection g6 are operated only from It is possible to set the on and off times, making initial settings easier. Note that the clock circuit section 4, time adjustment section 7, and operation control section 8 are formed of a clock IC with a timer function, and the on time and off time can be set using a manual switch instead of the automatic setting section 9. It goes without saying that a manual setting section may be provided to do this.

[Effect of the invention] As described above, the present invention has a time error of ±30 per day.
A clock circuit section that punishes a clock generation section that generates a clock smaller than a second, counts the clock in a counter circuit section, and displays the current time on a time display section, and a clock circuit section that stops the transmission of broadcast waves for a certain period of time at night. a broadcast receiving unit that receives a specific broadcast radio wave, and the transmission of the broadcast radio wave is restarted at a predetermined time when the second digit of a standard clock installed at the broadcasting station is 0 seconds;
A carrier wave detection signal is continuously obtained for 60 × N seconds (N is a positive integer excluding O) from the rise of the carrier wave detection signal output when a broadcast radio wave is received from the broadcast receiver M section. A time adjustment signal generation section that generates a time adjustment signal when the time adjustment occurs, and a time adjustment section that adjusts the current time of the clock circuit section to the nearest 0 seconds using the time adjustment signal. The system automatically adjusts the current time of the clock circuit at the same time, and detects the start of broadcasting depending on whether or not a carrier wave is received, and generates a time adjustment signal to adjust the current time. The circuit configuration of the time adjustment means is simpler and the cost is lower than in the conventional case where the time signal is extracted from the carrier wave detection signal. Since the time correction signal is output when the time is obtained,
Malfunctions will not occur due to transient noise such as lightning noise or transceiver interference. Even if the broadcast signal is suddenly interrupted due to a power outage at the broadcasting station and malfunctions, the error will be within 30 seconds and the probability will be corrected at 2α when the scheduled broadcast starts the next day. is large, and
Even if the time is not corrected, the time lag at the time of the next day's time adjustment is only one minute, and the time lag due to one malfunction is minimized, resulting in almost no inconvenience.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the same operation. @3 Figure is a block circuit diagram of another embodiment. 1 is a clock generation section, 2 is a counting circuit section, 3 is a time display section, 4 is a clock circuit section, 5 is a broadcast reception section, 6 is a time 1 positive signal generation section, 7 is a time correction section, 8 is an operation control section Department.

Claims (5)

[Claims] (1) A clock circuit unit that includes a clock generator that generates a clock with a time error of less than ±30 seconds per day, counts the clock in a counter circuit unit, and displays the current time on a time display unit; A broadcast receiving unit that receives a specific broadcast radio wave in which the transmission of the broadcast radio wave is stopped for a certain period of time at night, and the transmission of the broadcast radio wave is resumed at a predetermined time when the second digit of a standard clock installed at the broadcasting station is 0 seconds. Then, the carrier detection signal is obtained continuously for 60 × N seconds (N is a positive integer excluding 0) from the rise of the carrier detection signal output when the broadcast radio wave is received from the broadcast receiving section. It consists of a time adjustment signal generation section that generates a time adjustment signal when the time adjustment signal is received, and a time adjustment section that uses the time adjustment signal to adjust the current time of the clock circuit section to the nearest 0 seconds. An automatic time correction clock characterized in that the current time of a clock circuit section is automatically corrected at the same time. (2) If the second digit of the current time in the clock circuit section is less than 30 seconds, leave the hour digit and analysis as is and reset the second digit and below; if the second digit is 30 seconds or more, leave the hour digit as is and analyze. 2. The automatic time adjustment timepiece according to claim 1, wherein the time adjustment section is formed to add one minute to the second digit and reset the second digit and below. (3) Form the clock generating section of the clock circuit section so that the time error per day is a leading error sufficiently smaller than 30 seconds, and when the time correction signal is input, the hour and minute digits are left as they are and the seconds are 2. The automatic time-correction timepiece according to claim 1, wherein the time adjustment section is formed to reset the digits below. (4) Form the clock generating section of the clock circuit section so that the time error per day is a leading error sufficiently smaller than 30 seconds, so that the second digit of the current time after outputting the carrier wave detection signal first becomes 0 seconds. The time automatic timer according to claim 1, characterized in that the time adjustment section is formed so that the counting operation of the clock circuit section is stopped when the time adjustment signal is inputted, and the counting operation is restarted when the time adjustment signal is input. Corrected clock. (5) The automatic time correction clock according to claim 1, further comprising an operation control section that sets the operating time of the broadcast reception section and the time correction signal generation section to a fixed time including the broadcast start time. .