JPS63163191A - Receiver - Google Patents

Abstract

PURPOSE:To achieve a higher reliability with automatic correction of significant deviation, by detecting a time tone signal among received signals to automatically correct time of a timepiece while the detection time range of the time tone signal is altered according to the history of the automatic correction. CONSTITUTION:When time tone signals are supplied from bandpass filters 13 and 14 and a time tone is detected with a microcomputer 20, it is determined whether time setting is done by a user or not. Unless the time setting is done, automatic time correction is omitted as being useless. When the completion of the time setting is found, it is determined whether the time tone detected is the first after the time setting or after a power failure. When the time tone detected is found to be the first after the time setting or a power failure, the allowable range of the automatic correction is expanded to + or -30min so that time correction is permitted to counter even a significant deviation of a built-in timepiece 21. This can prevent erroneous time correction while accomplishing automatic correction of significant deviation of the timepiece.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a receiving device that has a built-in clock and is multi-functional and is used in television receivers, radio receivers, VTRs, and the like.

[Summary of the invention]

This invention provides a built-in clock that accurately detects a time signal sound signal sent from a broadcasting station in a multifunctional television receiver, radio receiver, VTR, etc. that has a built-in clock. By automatically correcting the time and changing the detection time width of the time signal sound signal according to the history of automatic correction, it is possible to prevent incorrect time correction and automatically correct large deviations of the built-in clock. As a result, the reliability of the time control function is improved.

[Conventional technology]

Conventional television receivers, radio receivers, VTRs, etc. have become more and more multi-functional and have built-in clocks, and have the ability to display the time on the clock, or to display scheduled programs based on the time on the built-in clock. There are known devices that have a timed control function that can automatically perform various operations such as displaying images. In the case of setting the time on the built-in clock of this type of equipment to the correct time, it has generally been done manually by the user himself/herself.

On the other hand, it has been proposed to automatically adjust the time of a clock by detecting a relatively accurate time signal that is broadcast from a broadcasting station every specific hour. The method or clock that detects the time signal and automatically adjusts the time is
Those shown in Japanese Patent Publication No. 299, Japanese Patent Publication No. 39-14744, and Japanese Patent Publication No. 39-28695 are known.

In any of these cases, the characteristics unique to the time signal sound are utilized, and the time signal sound signal includes the frequency and amplitude of the forecast sound and the hour sound, the duration of the forecast sound, or the time interval between the occurrences of the forecast sound and the hour sound. Based on the formant, it is configured to accurately separate only the time signal sound from the audio signal that is considered unnecessary noise, detect the hour sound, and automatically adjust the time.

Furthermore, in order to prevent malfunctions, it is also known to set a correction allowable range of a predetermined time width centered on the hour of the built-in clock.

[Problem that the invention seeks to solve]

However, when the conventional automatic time adjustment technology described above is applied to multi-functional television receivers, radio receivers, VTRs, etc., it becomes impossible for the user to check whether the built-in clock has been automatically adjusted. However, there was a problem in that it was not easy to use.

Therefore, in Japanese Patent Application No. 61-164518, the present applicant proposed that automatic time adjustment of a built-in clock by detecting a time signal signal sent from a broadcasting station would be possible, and that the adjustment had been made. A receiving device that can notify the user has already been proposed.

However, if the user of the receiving device roughly sets the built-in clock, if the receiver recovers after a power outage, or if automatic time adjustment is not performed for a long time, the built-in clock may become significantly incorrect. There is. If this deviation exceeds the above-mentioned allowable correction range, the built-in clock cannot be automatically corrected, and there is a problem in that the time control function of the receiving device, such as the display of reserved programs, is impaired.

In view of the above, an object of the present invention is to provide a receiving device that can prevent malfunctions in automatic time adjustment of a built-in clock and automatically correct large deviations thereof.

[Means for solving problems]

The present invention provides a receiving device having a clock, which detects a time signal in a received signal to automatically correct the time of the clock, and also changes the detection time width of the time signal according to the history of automatic correction. This is a receiving device.

[Effect]

According to the present invention, erroneous time adjustments are prevented, and large clock errors are automatically corrected, thereby improving the reliability of the time control function of the receiving device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a receiving device according to the present invention is applied to a multifunctional television receiver will be described below with reference to the drawings.

The configuration of one embodiment of the present invention is shown in FIG.

In Figure 1, a high frequency input signal from a receiving antenna (1) and an external high frequency input terminal (2) is connected to a selector switch (3).
) and supplied to the tuner (4). From the input terminal (2), for example, a VTR carrier reproduction signal from an empty channel is supplied.

In the tuner (4), the selected high frequency input signal is converted into a video intermediate frequency signal and an audio intermediate frequency signal of a predetermined frequency, and then supplied to the intermediate frequency circuit (5). The video signal and audio signal from the video detection circuit (6V) and audio detection circuit (6A) of this intermediate frequency circuit (5) are transferred to the video signal circuit (8V) via the changeover switch (OK) and (7A), respectively. ) and the audio amplification circuit (8A). Horizontal and vertical synchronizing signals from the video signal circuit (8V) are supplied to the deflection/high voltage circuit (9), and the deflection signal and high voltage DC from this are supplied to the picture tube (10). ) is supplied to the picture tube (10). The audio signal output of the audio amplification circuit (8A) is supplied to the speaker (11).

For example, base band reproduced video signals and reproduced audio signals from the external video signal input terminal (12V) and external audio signal input terminal (12A), and video and audio signals from the detection circuits (6V) and (6A). is selected by switch (OK) and (7A).

Each center frequency is 44 to separate the time signal sound signals.
0Hz and 880Hz bandpass filters (13) and (1
An audio signal is supplied to 4) from the audio amplification circuit (8A),
The outputs of both bandpass filters (13) and (14) are fed to a system control circuit (microcomputer') (20). This system control circuit (20) includes, for example, a clock (21) that operates based on the frequency of a commercial power supply AC.
The output of the character display circuit (22) controlled by the system control circuit (20) is the video signal circuit (8V).
The time of the clock (21) is displayed on the screen of the picture tube (10).

A key device (23) attached to the receiver body and a remote control receiver (24) are connected to the system control circuit (23).
0). When a user operates a key on a key device (23) or a remote control transmitter (25), the system control circuit (20) selects a tuner (4), switches (3) or switches. (7V)
, (7A), etc. are performed.

Furthermore, any program from any broadcast station is reserved by key operation on the remote control transmitter (25).

This reserved program is controlled by the microcomputer (20) when the clock (21) reaches a predetermined time.
0).

Next, the time adjustment operation of this embodiment will be explained with reference to FIG. Bandpass filters (13) and (14)
A time signal signal is supplied from the microcomputer (
20) When the time signal is detected (step ■), it is determined whether the clock has been set (manually) by the user (step ■) If the clock has not been set,
Automatic time adjustment is not done because it would be meaningless.

If the clock has been adjusted, it is determined whether or not the time signal detected in step ■ is the first time signal detected after the clock adjustment, or the first time signal detected after the power outage (step ■ ,■). The clock setting by the user is not always accurate and may be done roughly. Also,
Since the clock of this embodiment is of the power synchronization type as described above, it will go awry due to a power outage.

Therefore, when the first time signal is detected after clock adjustment or a power outage, in this embodiment, the allowable range for automatic correction is expanded to ±30 minutes (step ■), and the built-in clock (21) is Even if the time is significantly off, the time is corrected (step ■). As a result, at the reserved time, a channel selection signal is supplied from the microcomputer (20) to the tuner (4), and the desired reserved program of the desired broadcasting station is accurately received.

If the allowable range of correction is expanded in step ■, the time from 0:01 to 29:59 on the built-in clock (21) will be delayed and corrected to 0:00, and from 30:00 to 59:59. The time will be adjusted to 0 minutes 00 seconds, which is one hour ahead. For example, the time on the built-in clock (21) is 7:25.
If it is minutes, it will be corrected to 7:00 minutes 00 seconds, and if it is 6:35, it will be corrected to 7:00 minutes OO seconds.

If the detected time signal is not the first time after the clock was adjusted or the first time after a power outage, it is the second time since the previous automatic time adjustment.
It is determined whether or not it is within days (step ■). If it is within 2 days, the current time correction value is ±3, for example.
It is determined whether the time is within a narrow tolerance range set in minutes (step 2), and the time is corrected only if the required correction value is within this tolerance range (step 2).

If the required correction value exceeds this allowable range, it is assumed that the time signal sound detection has malfunctioned, and automatic time correction is not performed.

If the interval between the current and previous time adjustments exceeds 2 days, it is determined whether it has been within 7 days since the previous automatic time adjustment (step 2). If it has been more than 7 days since the last adjustment, there is a possibility that the clock (21) has become significantly incorrect, so expand the allowable adjustment range and perform automatic time adjustment as described above (step ■).

If it is within the range of 2 to 7 days since the last correction, the clock (21
) may exceed the aforementioned narrow tolerance range, it is determined whether the required correction value is within an intermediate tolerance range, for example set to ±10 minutes (step [phase]). If the correction value is within this allowable range, the automatic time adjustment in step (3) is performed, and if it is outside the intermediate allowable range, it is assumed that the time signal sound detection has malfunctioned, and automatic time adjustment is not performed.

As described above, in this embodiment, the allowable range of the correction value, that is, the detection time width of the time signal sound signal, is set to, for example, ±30 minutes, ±10 minutes, and ±3 minutes, depending on the time correction history of the built-in clock. By changing the time range to wide, medium, and narrow as appropriate, it was possible to prevent incorrect time adjustments and to automatically correct large clock deviations, but the detection time range and each period of correction history were set as appropriate. can do.

Furthermore, the built-in clock is not limited to the power synchronized type.

〔Effect of the invention〕

As described in detail above, according to the present invention, the detection time width of the time signal sound signal is changed according to the history of automatic correction of the built-in clock, so that erroneous time correction is prevented and the clock A receiving device is obtained in which large deviations are automatically corrected and the reliability of the time control function is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a receiving apparatus according to the present invention, and FIG. 2 is a flowchart for explaining the operation of the embodiment of the present invention. (4) is a tuner, (8V) is a video signal circuit, (8A)
is an audio signal amplifier, (13) and (14) are bandpass filters, (20) is a system control circuit (microcomputer), (21) is a clock, and AC is a commercial power supply.

Claims (1)

[Claims] In a receiving device having a clock, the time of the clock is automatically corrected by detecting a time signal sound signal in a received signal, and the detection time width of the time signal sound signal is adjusted according to a history of automatic correction. A receiving device characterized by being configured to change.