JPH09113648A - Timepiece with automatic time setting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a timepiece which is set by the time signal of AM and FM broadcasting. SOLUTION: This timepiece is provided with a band selection means 9 for selecting an AM receiver circuit 2 or an FM receiver circuit 3, a time signal detection circuit 5 connected with a sound circuit part 4 and the first microcomputer 6 to select a receiver and an internal timepiece and simultaneously the second microcomputer 7 to reserve the time signal. By receiving AM broadcasting and FM broadcasting by turns at the preset time, the just time is detected from the time signal and zero-reset of the internal timepiece of the second microcomputer 7 is performed. By this with a band in good receiving condition, correct time setting is made.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece with an automatic time adjustment function, and more particularly to a timepiece with an automatic time adjustment function for adjusting the time of day by radio broadcasting.

[0002]

2. Description of the Related Art Conventionally, a clock for adjusting the time according to the time signal of a radio broadcast has been mainly introduced in a video equipment. This is connected to the TV antenna and is in a good reception condition.
The time was adjusted by selecting the station that outputs the time signal, such as K educational TV, within a day. However, a clock with a time correction function using an AM or FM radio receiver is not in practical use because the reception situation is often not better than that of a TV.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a timepiece with an automatic time adjustment function that utilizes time signals from AM and FM radio broadcasts.

[0004]

In order to solve such a problem, a watch with an automatic time adjustment function according to the invention of claim 1 is connected to a band selecting means and a band selecting means for selecting an AM receiving circuit and an FM receiving circuit. A second microcomputer having an audio circuit section and a time signal signal detection circuit connected to the audio circuit section and an internal clock connected to the time signal signal detection circuit, and a reception band connected to the second microcomputer and having a channel selection keyboard It is configured to include a first microcomputer for selecting and selecting a channel, and the time for receiving the time signal is set by the second microcomputer so that AM broadcasting and FM broadcasting are not received at different set times. Detect the time,
The internal clock in the second microcomputer is reset.

According to a second aspect of the present invention, a timepiece having an automatic time adjustment function is provided with a sound volume adjusting circuit in the voice circuit section, and the second microcomputer controls the voice output level to a constant level when receiving the time signal.

According to another aspect of the present invention, in a timepiece having an automatic time adjustment function, a tuning keyboard is provided with at least a band switching key and a tuning key, and one of the tuning keys is used for presetting a broadcasting station that receives a time signal. .

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 is a block diagram of a timepiece having an automatic time adjustment function according to the present invention, FIG. 2 is an amplitude change diagram of a time signal, and FIG. 3 is a just time detecting operation of a timepiece having an automatic time adjustment function according to the present invention. FIG. 4 is a time chart showing the reserved time for the just time detection operation of the timepiece with the automatic time adjustment function of the invention. FIG.
6 is a flowchart of just time detection operation of the timepiece with an automatic time adjustment function of the invention.

First, the timepiece 1 with the automatic time adjustment function of the present invention has an AM receiving circuit 2, an FM receiving circuit 3, a voice circuit section 4 receiving these outputs, a time signal detecting circuit 5, a first microcomputer 6, and a second microcomputer 6. The control unit 8 is composed of the microcomputer 7. The AM receiving circuit 2 includes a mixer 2b that mixes an RF signal received from an antenna and a local oscillation signal received from a local oscillator 2a, an IF amplifier 2c that amplifies the signal of the mixer 2b, and a detection circuit 2d that detects a signal from the IF amplifier 2c. .

The FM receiving circuit 3 receives RF from the antenna.
A mixer 3b for mixing a signal and a local oscillation signal received from the local oscillator 3a, an IF amplifier 3c for amplifying the signal of the mixer 3b, and a detection circuit 3d for detecting the signal from the IF amplifier 3c are provided. The outputs of the AM receiving circuit 2 and the FM receiving circuit 3 are selectively connected to the audio circuit section 4 via the band changeover switch 9.

The audio circuit section 4 is provided with a volume adjusting circuit 4a for receiving a signal from the band changeover switch (band selecting means) 9 and adjusting the signal level, and a power amplifier 4b and a speaker 4c are provided at the subsequent stage of the volume adjusting circuit 4a. , And a headphone amplifier 4d and a headphone 4e are connected in parallel with the power amplifier 4b.

A time signal signal detection circuit (tone decoder) 5 for detecting a time signal is connected to the output side of the headphone amplifier 4d, and the time signal signal detection circuit 5 is connected to the control unit 8. The time signal signal detection circuit 5 is the time signal 4
A 40 Hz signal is detected and the High and Low levels (H / L level) of the signal are output. Since the time signal is output from the latter stage of the volume adjusting circuit 4a, the signal level can be easily changed.

The control unit 8 is provided with a first microcomputer 6 connected to the AM receiving circuit 2 and the FM receiving circuit 3 to select a channel, select a band and mainly control the receiver. A second microcomputer 7 connected to the first microcomputer 6 for receiving the output of the time signal signal detection circuit 5 is also provided.

A channel selection keyboard 10 is provided in the first microcomputer 6.
Is connected, and AM, F on the tuning keyboard 10
Band selection key 1 for selecting frequency bands such as M and SW
0a, a preset key 10b for presetting the reception frequency of the selected broadcasting station, and a scan key 10c for sweeping the reception frequency.

The second microcomputer 7 has an internal clock and has a program input terminal 7a for counting time, reserving a time signal of a desired time, and reserving a broadcasting station for detecting the time signal. A display 7b, which is provided with liquid crystal or the like for displaying the reception frequency, time, and time correction, is connected.

Before explaining the operation of the timepiece having the automatic time adjustment function having the above-mentioned structure, the time signal will be explained with reference to FIG. In the case of NHK, the time signal 11 is, as shown in FIG. 2, three first tones 11a, 11b and 11c each having a voice frequency of 440 Hz for 0.1 second.
The second tone 11d consisting of a voice frequency of 880 Hz is emitted for 0 second, followed by a second tone 11d for 1 second or longer, and when this is heard, it sounds like a beep, a beep, a beep and a pawn. It sounds like it sounds. The time when the second tone 11d is started is the just time 12.

The operation of the timepiece having the automatic time adjustment function having such a configuration will be described below. This will be described with reference to FIGS.
First, one of the tuning keys 10b of the first microcomputer 6
Select 0b1 and preset AM broadcast NHK first broadcast 594 Hz and FM broadcast NHK FM82.5 MHz.

Next, from the program input terminal 7a of the second microcomputer 7, a program for presetting the time of the received time signal is input. For example, as shown in FIG. 4, it is assumed that 5 times of 0 o'clock, 7 o'clock, 12 o'clock, 15 o'clock, and 19 o'clock are selected within 24 hours a day. In addition, at each reception time signal, the reception bands AM and FM of the receiving broadcasting station are input.

For example, as shown in FIG. 4, the AM station at 0 o'clock,
FM station at 7:00, FM station at 12:00, AM at 15:00
The station is preset to receive the FM station at 19:00. In this way, if different reception bands are received depending on the reception time, for example, when the radio wave condition of the AM band is bad at 0 o'clock and reception is not possible, the just time is not detected by the time signal check and skipped. And
When the FM band received at 7 o'clock can be received, the time signal check can be performed there.

In the state set in this way, for example, time 0
Assuming that it is near time, the AM receiving circuit and the audio circuit section 4 are turned on at 0:03, and at the same time, the band changeover switch 9 is switched to the AM receiving side, and the preset NHK first broadcast is started. Received. Further, the output level of the volume adjusting circuit 4a is set to a preset value. When the reception state is good, the time signal 11 shown in FIG. 2 arrives.

First, the first tone 11a is detected by the time signal signal detection circuit 5 and is sent to the second microcomputer 7 in the form of a high and low level signal (H / L signal).
In the second microcomputer 7, the first tones 11a, 11
When three tones b and 11c are detected, an internal timer (included in the second microcomputer 7) is counted for 0.9 seconds from the trailing edge of the last tone 11c, and at the same time the count ends, the internal timer is counted. Reset the clock to zero.

FIG. 3 is a time chart showing the just time check and the zero reset operation. The time of the clock is (1) when the time signal is detected and (2) when the reception condition is bad and the time signal is not detected. Shown along the axis. In this example, the clock indicates 0 minutes 0 seconds (timing t
There is a deviation (advancement of the clock) between 2) and the actual time of just time 12 (timing t3), but the zero reset is performed at the time of t3 and the time is corrected to the correct time.

FIG. 5 is a flow chart showing the just time detection operation described above. The arrival of the reserved time is detected in step S1, the power of the receiver and the voice circuit unit 4 is turned on in step S2, and then in step S3. The 6-minute timer is turned on, and then in step S4 the display on the display 7b is switched to the display during the just time detection operation. Then, in step S5, the first tone 11a is detected, and then in step S6, the one second timer is turned on,
At 7, the first tones 11b and 11b are detected. If it is detected, it is checked in step S8 whether or not the one second timer is over. If it is over, the microcomputer internal clock is reset to zero in step S9.

Then, in step S10, the display 7b is displayed.
Switch to the current time display. Next, in step S11, the receiver and the audio circuit unit 4 are turned off. If the tone cannot be detected in step S7, the first tone 11a is detected again in step S12, and it is checked in step S13 whether or not the one second timer has expired. 1 tone 11a
Detection is repeated. If not over, the process returns to step S12.

In the above-described embodiment, the AM broadcast and the FM broadcast are received almost alternately at the time set for receiving the time signal, but the present invention is not limited to this embodiment, and both bands can be received within 24 hours. In this case, the effect of the present invention can be obtained.

[0026]

According to the present invention, since the time of the clock is corrected by the time signal of a plurality of reception bands, the time of the quartz oscillator, which is the time base, can be adjusted because the time can be adjusted with high reliability and high accuracy. It is possible to provide a clock with an automatic time adjustment function that can reduce demands and reduce costs.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a timepiece having an automatic time adjustment function according to the invention.

FIG. 2 is a diagram showing an amplitude change of a time signal.

FIG. 3 is a time chart of the just time detection operation of the timepiece having the automatic time adjustment function of the invention.

FIG. 4 is a time chart showing reserved times for the just time detection operation of the timepiece having the automatic time adjustment function of the invention.

FIG. 5 is a flowchart of the just time detection operation of the timepiece with the automatic time adjustment function of the invention.

[Explanation of symbols]

 1 Clock with Automatic Time Adjustment Function 2 AM Reception Circuit 2a Local Oscillator 2b Mixer 2c IF Amplifier 2d Detection Circuit 3 FM Reception Circuit 3a Local Oscillator 3b Mixer 3c IF Amplifier 3d Detection Circuit 4 Voice Circuit Section 4a Volume Adjustment Circuit 4b Power Amplifier 4c Speaker 4d Headphone amplifier 4e Headphones 5 Time signal detection circuit (tone decoder) 6 First microcomputer 7 Second microcomputer 7a Input terminal 7b Display 8 Control section 9 Band changeover switch (band selection means) 10 Channel selection keyboard 10a Band selection key 10b Channel selection key 10c Scan key 11 Time signal 11a, 11b, 11c First tone 11b Second tone 12 Just time

Claims (3)

[Claims] 1. A band selecting unit for selecting an AM receiving circuit and an FM receiving circuit, an audio circuit unit connected to the band selecting unit, a time signal detection circuit connected to the audio circuit unit, and the time signal. A second microcomputer having an internal clock connected to the detection circuit; and a first microcomputer connected to the second microcomputer and having a tuning keyboard for selecting a reception band and tuning. The time signal for receiving the time signal is set by the microcomputer of, the AM broadcast and the FM broadcast are not received at different set times, the just time is detected from the time signal,
A clock with an automatic time adjustment function for resetting the internal clock in the second microcomputer. 2. The audio circuit section is provided with a volume adjusting circuit, and the audio output level is set to a constant level by the second microcomputer when a time signal is received.
Clock with automatic time adjustment function described in. 3. The tuning keyboard is provided with at least a band switching key and a tuning key, and one of the tuning keys is used for presetting a broadcasting station that receives a time signal. Clock with automatic time adjustment function described in.