JPH0727037B2 - Receiver - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a multi-functional television receiver, a radio receiver, a receiver used in a VTR and the like, which has a built-in clock.

[Outline of Invention]

The present invention relates to a multi-functional television receiver having a built-in clock, a radio receiver, a receiver used in a VTR, etc., which accurately detects a time signal sound signal transmitted from a broadcasting station and has a built-in clock. By automatically correcting the time of day and prohibiting the automatic time adjustment of the clock at least in the external input mode, it is possible to prevent unnecessary time adjustment without relying on the true time signal sound signal, and to improve the reliability of the time control function. It is intended to improve.

[Conventional technology]

Conventional television receivers, radio receivers, VTRs, etc. have been multi-functionalized and have a built-in clock, and various functions are automatically performed based on the function of displaying the time of the clock and the time of the built-in clock. It is known to have a timed control function that can be performed in a timely manner. In the case of adjusting the time of a clock built in such a type of device to the correct time, it is general that the user himself / herself makes it manually.

On the other hand, it has been proposed to detect a relatively accurate time signal sound signal broadcast from a broadcasting station every specific hour to automatically correct the time of a clock. As a method or a clock for automatically correcting the time by detecting a time signal sound signal, Japanese Patent Publication No. 38-1299
Known are those disclosed in Japanese Patent Publication No. 39-14744 and Japanese Patent Publication No. 39-28695.

In any of these cases, the characteristics peculiar to the hourly sound are utilized, and the frequency and amplitude of the hourly sound and the hourly sound, the duration of the hourly sound, or the hourly sound signal such as the time interval of the hourly sound and hourly sound are generated. Based on the format, only the time signal sound is accurately separated from the voice signal which is considered to be unnecessary noise, and the hour sound is detected to automatically adjust the time.

[Problems to be solved by the invention]

However, a television receiver, a radio receiver, and
When applied to a VTR or the like, there was a problem that the user could not confirm whether or not the built-in clock was automatically adjusted and the usability was poor.

Therefore, the applicant of the present application has disclosed that, in Japanese Patent Application No. 61-164518, it is possible to detect the time signal sound signal transmitted from the broadcasting station and automatically adjust the time of the built-in clock, and the correction is made. We have already proposed a receiving device that can inform the user.

However, when recording a broadcast program on a tape, a time signal may be recorded together with the program. When the tape on which this time signal is recorded is played back, a time signal sound signal that exactly matches the signal format is obtained. There was a problem that the clock built in the receiving device was confused by the automatic time adjustment.

In view of such a point, an object of the present invention is to provide a receiving device that prevents unnecessary automatic time adjustment that does not depend on a broadcast time signal sound signal of a built-in clock.

[Means for solving problems]

The present invention selects a broadcast information signal including a broadcast time signal sound signal supplied via an antenna in the normal input mode and a reproduction information signal including a reproduction time signal sound signal supplied via an external input terminal in the external input mode. From the information signal received by the receiving unit, the system control unit that controls the receiving unit to a receiving state according to at least each input mode, the clock for time management of the system control unit, and the information signal received by the receiving unit. The system control unit includes a time signal sound detection unit that detects a time signal sound signal, and the system control unit includes at least an input mode determination unit that determines an input mode in the reception unit and a time signal sound signal from the time signal sound signal detection unit. , A time adjustment means for adjusting the time of the clock, and a time adjustment prohibition for prohibiting the time adjustment by the time adjustment means when the determination result from the input mode determination means indicates the external input mode. Constituting provided with means.

[Action]

In the receiving device according to the present invention, the receiving unit is controlled by the system control unit to be in the receiving state according to the normal input mode or the external input mode. Specifically, when the receiving unit is in the normal input mode, the broadcasting time signal sound signal (the time signal sound signal indicating the true time) supplied via the antenna in the receiving unit.
When broadcast information including is received and the receiver is in the external input mode, the receiver receives the reproduction time signal sound signal (time signal sound signal that does not indicate the true time) supplied through the external input terminal.
Will be received.

Then, in the normal input mode, the time of the clock is corrected by the time adjusting means based on the time signal sound signal from the time signal sound signal detecting means. On the other hand, in the external input mode, the time correction prohibiting means is activated based on the discrimination result indicating the external input mode from the input mode discriminating means, and the clock time is corrected based on the time signal sound signal from the time signal sound signal detecting means. Will be banned.

As described above, in the receiving device according to the present invention, the time of the clock is corrected only by the true time signal sound signal, and the unnecessary time adjustment without the true time signal sound signal is prevented. The reliability of the timed control function will be improved.

〔Example〕

An embodiment in which the 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 FIG. 1, the high frequency input signals from the receiving antenna (1) and the external high frequency input terminal (2) are selected by the changeover switch (3) and supplied to the tuner (4). For example, since channel # 2 is not used for broadcasting in the Tokyo area and channel # 1 is used in the Osaka area, the VTR of the above-mentioned empty channel is input from the input terminal (2).
Carrier reproduction signal 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 supplied to the intermediate frequency circuit (5). The video signal and the audio signal from the video detection circuit (6V) and the audio detection circuit (6A) of the intermediate frequency circuit (5) are respectively transferred via the changeover switches (7V) and (7A) to the video signal circuit (8V). And an audio amplifier circuit (8A). The 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 the high voltage DC from this are supplied to the picture tube (10) and the video signal circuit (8
The video signal output of V) is supplied to the picture tube (10). The audio signal output of the audio amplifier circuit (8A) is supplied to the speaker (11).

(12V) is an external video signal input terminal, and (12A) is an external audio signal input terminal. For example, a VTR baseband playback video signal and playback audio signal from these terminals and a detection circuit (6
V) and (6A) video and audio signals and switch (7
V) and (7A).

The audio signals are supplied from the audio amplifier circuit (8A) to the band-pass filters (13) and (14) whose center frequencies are 440 Hz and 880 Hz, respectively, and the outputs of both band-pass filters (13) and (14) are
It is supplied to the system control circuit (microcomputer) (20). This system control circuit (20) has, for example, a built-in clock (21) that operates based on the frequency of the commercial power supply AC, and the output of the character display circuit (22) controlled by the system control circuit (20) is Supplied to 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 main body of the receiver and a receiver (24) for remote control are connected to the system control circuit (20). The user operates the key device (23) or the remote control transmitter (25) to be controlled by the system control circuit (20) to select the tuner (4), switch (3) or switch (7V). ) And (7A) are switched.

Next, the time adjustment operation of this embodiment will be described with reference to FIG. The time signal sound signal is supplied from the band-pass filters (13) and (14) to the microcomputer (20).
When the time signal is detected by (step), it is judged whether or not the receiver is in the test mode (step). In the test mode, the automatic time adjustment is always performed by the test time signal sound signal in the manufacturing process. Done.

If the test mode is not set (because the product is switched to the non-test mode and shipped after the test in the manufacturing process), it is determined whether or not the clock has been (manually) set by the user (step). If the clock has not been set, automatic time adjustment will not be performed because it has no meaning.

If the clock has been set, switch (7V) and (7V
It is determined whether or not A) is in the connection state shown and the receiver is in the external input mode (step). In the external input mode, automatic time adjustment is not performed. In the external input mode, it is determined whether the required time adjustment value is within the allowable adjustment range (step). This allowable correction range is set to, for example, around 00 minutes of the built-in clock within a range of ± 3 minutes, and automatic time adjustment is performed only when the correction value is within this range (step) to prevent malfunction. .

Next, another time correction operation of this embodiment will be described with reference to FIG. In FIG. 3, the above-mentioned second
The steps corresponding to those in the figure are denoted by the same reference numerals and the description thereof is partially omitted.

In FIG. 3, when the time signal is detected by the microcomputer (20) and it is determined that the receiver is not in the test mode and the clock has been set (step ~), for example, in the Tokyo area, It is determined whether or not the channel # 1 or # 3 is received (step). If channels other than channels # 1 and # 3 are being received, it is determined that the one detected in step is not a true time signal sound, and the time is not adjusted.

When the channel # 1 or # 3 is received, it is determined that the required time correction value is within the allowable correction range (step) and the time is corrected, as described above.

It should be noted that the time adjustment in FIG. 3 is performed on channel # 1 or # 3.
However, this channel is used only when the receiver is installed in, for example, the Osaka area.
Therefore, it is designated as appropriate according to the status of the time signal broadcast in the installation area.

Next, still another time adjustment operation of this embodiment will be described with reference to FIG. In FIG. 4, steps corresponding to those in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is partially omitted, and the determination (step) of the test mode is omitted.

In FIG. 4, when the time signal is detected by the microcomputer (20) and it is determined that the time setting of the receiver has been completed (step,), whether the frequency of the commercial power supply AC is 50 Hz or not is determined. If the power supply frequency is 50 Hz, it is determined whether or not channel # 2 is being received (step). If the power supply frequency is not 50 Hz, it is whether or not channel # 1 is being received. Is judged (step). As is well known, the power supply frequency in the Tokyo area is 50 Hz, and the power supply frequency in the Osaka area is 60 Hz. Further, as described above, since channel # 2 is generally used in the Tokyo area and channel # 1 is used in the Osaka area as a transmission path for the VTR reproduction signal, respectively, depending on the steps,
It is determined whether or not the reproduction signal of is received, and when the reproduction signal of the VTR is received, the automatic time adjustment is not performed, and unnecessary time adjustment is prevented.

In the above description, the operations of FIGS. 2 to 4 are described as being performed independently, but they may be used in combination.

〔The invention's effect〕

As described above in detail, according to the present invention, in the external input and the specific television channel, the unnecessary automatic time adjustment which does not depend on the true time signal is prohibited. An improved receiver is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the receiving apparatus according to the present invention, and FIGS. 2 to 4 are flowcharts for explaining the operation of the embodiment of the present invention. (2) is an external high frequency signal input terminal, (4) is a tuner,
(8V) is the video signal circuit, (8A) is the audio signal amplifier, (12V)
V) is an external video signal input terminal, (12A) is an external audio signal input terminal, (13) and (14) are bandpass filters, (20) is a system control circuit (microcomputer), and (21) is a clock.

Claims (1)

[Claims] 1. A broadcast information signal including a broadcast time signal sound signal supplied through an antenna in a normal input mode, and a reproduction information signal including a reproduction time signal sound signal supplied through an external input terminal in the external input mode. A receiving unit for selectively receiving, a system control unit for controlling the receiving unit to a receiving state according to at least each input mode, a clock for time management of the system control unit, and a receiving unit for receiving the And a time signal sound detecting means for detecting a time signal sound signal from the information signal, wherein the system control section includes at least an input mode judging means for judging an input mode in the receiving section, and a time signal sound signal detecting means. The time adjustment means for adjusting the time of the timepiece on the basis of the time signal sound signal and the determination result from the input mode determination means indicates the external input mode. Receiver and having a time correction inhibiting means for prohibiting the time correction of positive means.