JPH0454487A - digital clock - Google Patents

Abstract

PURPOSE:To automatically correct the time by taking in the time announcement of a TV, etc., through a microphone, discriminating whether the time announcement is by NHK (Nippon Hoso Kyokai) or commercial broadcasting station, judging whether the timepiece is fast or late in how many seconds and advancing the hand operation when the timepiece is late and stopping the hand operation when the timepiece is fast. CONSTITUTION:Every second signals 275 are taken into a counter A 271 of a deciding circuit 27. The counter A 271 is so preset as to be reset to 0 simultaneously when the count value attains 60. When a time announcement signal 261 is admitted from the microphone the signal is tuned to the frequency of the time announcement on the hour so as to turn the output signal 274 to an H. The pulse signal of an output section 274 and the 0 reset signal 276 of the counter A 271 are sent to a counter B 277. The signal inputted earlier of the time announcement 274 on the hour and the 0 reset signal of the counter A 271 is decided as a start signal and the time seconds before the other signal is inputted are counted. The count is sent to a control circuit 278. The display of a time display section 24 is changed by the output of the control circuit section 278.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a time adjustment method for small and medium-sized timepieces such as wristwatches, table clocks, and wall clocks.

[Problem to be solved by the invention]

In the conventional example, some kind of operation is required when adjusting the time. Recent electronic watches have a monthly difference of less than ±20 seconds,
You only need to adjust the time once every 1-2 months. However, generally speaking, adjusting the time is not a habit, and even if it is done once a month, it is a nuisance, and especially for elderly people, they feel resistance just by looking at the operation buttons on a digital watch. There are some people. The presence of operation buttons is also a bottleneck in watch design. The object of the present invention is to eliminate such drawbacks and provide an accurate and beautiful digital clock.

[Means to solve the problem]

The digital watch of the present invention is provided with a microphone or line jack terminal on the main body of the watch, an amplifier circuit that amplifies the signal obtained from the terminal or the microphone, and a synchronization determination of the signal obtained from the amplification circuit. A tuned circuit that can emit a signal and a counter B that takes in the signal obtained from the tuned circuit.
and counter A to send a 0 reset signal to counter B.
It is characterized by being equipped with an automatic time adjustment device consisting of.

〔Example〕

A circuit block diagram of the present invention is shown in FIG.

In the case of normal drive, the configuration is of block 11;
a frequency dividing circuit 15 for dividing the frequency of the clock motor 1 signal, a drive pulse forming circuit 14 for shaping a drive signal for driving the clock motor using the frequency divided signal, and a clock motor 1.
5 growls.

In the case of time adjustment, signal control is performed in block 16, and a signal for time adjustment is sent to clock display section 15 to perform time adjustment.

The configuration consists of a receiving unit 1 that receives signals sent from a TV, etc.
7 and a determination circuit 18 for time signal determination.

Specific examples of each block will be explained below.

FIG. 2 shows a specific embodiment of the present invention.

In this embodiment, an inverter oscillation circuit 21 including a crystal resonator 212 and an inverter 215 is used.

10 of the crystal oscillator 212 is 5Z768KH2, but 2
N) If N≧8 in IZ, the frequency can be freely selected. Resistor 211 is about 1MΩ, capacitor 2i4, 215
It is sufficient to use one having a value of about 15 to 50 PIF. The frequency is adjusted to 52.768 KHz by a variable capacitor 216.

The frequency of the signal obtained from the oscillation circuit 21 is divided by the frequency dividing circuit 22 to obtain a signal of a desired frequency.

In the embodiment of the present invention, Q+5 (IHz
)+Q for time adjustment. (52 nz)' frequency signal is used.

Data signal Q1° obtained by frequency dividing circuit 22.

One of the signals of QI5 is selected by the analog switches 251 and 252 of the drive pulse shaping circuit 26 (the selection method will be described later), and the signal is sent to the v/D counter 2 via the OR circuit 233.
Send to 34.

Next, the signal control method will be described.

A time signal from a TV or the like is received by a condenser microphone or line jack terminal 25, and the signal amplified by a Tr 26 is sent to a time signal determination circuit 27. As everyone knows (NHK's time signal is 44
After issuing three 0HH signals, an 880Hz signal is issued on the hour. In addition, after the commercial broadcaster issued two 440Hz signals,
Outputs an 880Hz signal. Therefore, it is necessary to set in advance which signal to use, and to determine whether the signal is 880 Hz or 440 Hz after the two 440H2 signals.

In this example, 440H2 signal is issued 1 second after two 440H2 signals
The determination will be based on whether the Hz signal is high or not.

Details of the determination circuit 27 are shown in diagram M3. A signal 275 is taken in every second into a color/receiver A271 provided inside. Counter A
271 is O when the second hand reaches the 12 o'clock position when the product is shipped.
Reset. If there is no second hand, use a standard clock to set it. If the counter A271 is set to be simultaneously KO reset when the count number reaches 60, the movement of the hand and the count number will match.

A time signal 261 is input from the condenser microphone 25 to the determination circuit 27 via the amplifier 1i1Tr 26. Judgment circuit 2
In the tuning circuit 273 provided at 7, the hourly signal frequency 8
It is tuned to 80Hz so that the output signal 274 becomes H. As shown in FIG. 4, in the case of NHK, the signal for time adjustment is the hourly signal (SA
oaz), there are three preliminary signals (440Hz), and in the case of commercial broadcasting, there are two more like a pulse signal 52. If both signals are tuned at 880 Hz, a pulse signal (51152) will be output from the output section 274 of the simultaneous circuit 273 on the hour. The pulse signal of the output section 274 and the D reset signal 276 of the counter A271 are sent to the counter B277. The hourly signal 27
If 4 is earlier than the 0 reset signal of the counter A271 inside the determination circuit, it is determined that the clock is delayed. Whichever is earlier (using the input signal as a start signal, it counts how many seconds it took until the other signal is input and sends it to the control circuit 278. Therefore, first, it is determined whether it is behind or ahead; Next, count how many seconds there is a difference from the regular time signal.If the clock is ahead, the control circuit 278 sends a signal to the v/D counter 254 in FIG. 2 via 255 by the difference. the clock display section 24 by counting down.To adjust the time, press the second button.
The determination circuit 27 shown in the figure outputs an L signal.

Analog switch 251 is H, analog switch 232
becomes L, so Q□ of the frequency dividing circuit 22. A signal is output, allowing you to quickly adjust the time. The hour signal is from counter 2
If the reset signal is input 15 seconds after it is input, there is a 15 second delay. Therefore, the frequency dividing circuit 22
Ql. The correction is completed by sending 15 signals to the v/D counter.

If the amount of correction is large and it takes more than 1 second to correct, add the amount of correction and make the correction. In the case of this embodiment, when a correction is made for 51 seconds or more, a correction amount of 1 is added to the correction.

〔Effect of the invention〕

As described above, the present invention takes in a time signal such as T7 through a microphone, amplifies it with an amplifier circuit, and determines whether the time signal is N.
In addition to determining whether the watch is broadcast from HK or a commercial station, it also determines how many seconds the clock is ahead or behind, and if it is behind, the hands will move forward, and if it is ahead, it will stop moving and automatically adjust the time. It is.

According to the present invention, the time can be automatically corrected without bothering the user, and accurate time can be provided to the user. In addition, the method of the present invention does not require the use of a special and expensive crystal oscillator or any special circuitry in order to maintain high accuracy, so it is possible to provide an inexpensive and highly accurate timepiece.

Additionally, since there is no need for a crown or operation buttons for adjusting the time, it is possible to provide users with a watch that has a clean and luxurious design.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of the present invention. FIG. 2 is a detailed circuit block diagram. FIG. 3 is a detailed diagram of the determination circuit 27. FIG. 4 is a timing chart of the time signal. In the figure, 11-.--Blocks for normal drive 12-m-Oscillation circuit 15--Frequency dividing circuit 14--Drive pulse shaping circuit 15--Clock display section 16--Block for one-time adjustment 17--Receiving section 18--One judgment circuit 21--Inverter oscillation circuit 22--One frequency division circuit 25--Drive pulse Molding circuit 24 --- Clock display section 25 --- Condenser microphone 26 --- Amplifying transistor 27 --- Time signal determination circuit 5l --- NHK pulse signal 52 --- Commercial broadcast pulse More than a signal

Claims (1)

[Claims] In small and medium-sized watches such as wristwatches and table clocks, a microphone or line jack terminal is provided on the watch body, and an amplifier circuit that amplifies the signal obtained from the terminal or the microphone and a tuning circuit that determines the tuning of the signal obtained from the amplifier circuit. , a counter B that takes in the signal obtained from the tuned circuit, and a counter B
A digital timepiece characterized in that it is equipped with an automatic time adjustment device consisting of a counter A for sending an O reset signal to a counter A.