JP3322489B2 - Automatic time setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic time setting device for automatically setting the time of a built-in clock based on time data included in an EDS (Extended Data Service) signal during a vertical blanking period of a video signal.

[0002]

2. Description of the Related Art In a video tape recorder (hereinafter, referred to as a VTR), channel setting and time setting are operations that must be performed before a user starts using a device. In recent years, it has an automatic channel selection function of automatically searching for and storing a tuned channel, and an automatic time setting function of setting time based on an additional signal in a vertical blanking period of a video signal (television signal). An automatic time setting device has been realized, and there is a VTR equipped with the automatic time setting device to simplify an operation to be performed by a user.

[0005] Broadcasting stations transmit various information using a vertical blanking period such as a caption. Currently, PDC (Program De-
livery Control) and teletext (teletext). In the United States, a new data service (EDS = Extended Data Service) in which a data signal is superimposed on a video signal using a vertical blanking period was started in April 1994. The EDS signal also includes time data, broadcast station (channel) information, and the like, similarly to the additional signal of the other vertical blanking period, and uses this time data to automatically set the clock. I have.

As shown in FIG. 5, the EDS signal is superimposed on the 21st horizontal synchronizing signal in the vertical blanking period of the even field of the video signal (television signal). And 17 bits are transmitted. Therefore, although the data portion is 2 bytes, one character code is assigned to one byte, and each byte has parity bits p1 and p2. EDS
In the signal, first, a control code (1 byte) and a type code (1 byte) are transmitted, and the two codes indicate the type of information to be transmitted. (Example: Time data (0
7,01), broadcasting station (channel) information (05,0)
2)) After the type of information to be transmitted is determined by the above-described code, information specified in the specification (the number of bytes, format, etc.) is transmitted, and after the information transmission is completed, a control code (OF) indicating the end is transmitted.
Send

The time data of the EDS signal is composed of, for example, a total of 10 bytes (5 even fields = 5 frames) as follows. (07,01)-(minute, hour)-(day, month)-(day, year)
-(OF, any code) In the time data of the EDS signal, the sixth bit (b5) of the "month" data is used as a second reset flag ("Z" bit) indicating that the second of the time is just 0 second. I have.

An operation procedure of a time setting process of a VTR provided with a conventional automatic time setting device based on an EDS signal is described below by using a menu key and a cursor on a display unit using an on-screen display (hereinafter referred to as OSD). A description will be given based on a configuration example in which an instruction is given by an input unit using a key and an execution key.

First, the user operates the menu key,
Call the main menu on the OSD screen. The main menu is “TUNER PRESET”, “CLOCK SET”, “TIMER
The part where the entry is highlighted is the cursor position, and the entry at the cursor position is processed by operating the execution key. Then, the time is set. Use the cursor keys to move the cursor to the “CLOCK SET” entry, and use the Enter key to enter “CLOC SET”.
Call up the “K SET” menu on the screen.
The menus are “EDS (AUTO)”, which automatically sets the time based on the EDS signal, and “MANUA,” which sets the time manually.
L ”entry.

In order to set the time based on the time data of the EDS signal, the user operates a cursor key to select "EDS (AUT
Move the cursor to the “O)” entry and operate the Enter key to bring up the “SET EDS CHANNELS” menu on the screen.
"AUTO" for setting the time after searching for a channel including time data in the DS signal, and when the user knows the channel including time data in the EDS signal, the user inputs the channel and hassle in searching. “MANUA”
L ”entry. Next, use the cursor keys to move the cursor to the“ AUTO ”entry,
The execution of the time setting process is set by operating the execution key.

When the power of the apparatus is turned off, a time setting process is started to sequentially search for a receivable channel from the lower frequency side to determine whether or not time data is being transmitted. When a channel for transmitting time data is found, the time is set based on the time data.

[0010]

However, the time data of the EDS signal does not include the second data as described above.
It only includes a "Z" bit indicating that the second of the time is exactly 0 seconds. Therefore, when setting the clock built in the device using the time data of the EDS signal, it is necessary to wait until a channel having the time data with the “Z” bit set is received. In this case, if time data is always transmitted every 0 seconds, the clock can be set by waiting for a maximum of one minute.

However, EDS rules (EIA-608, "Recom
mended Practice for Line 21 DataService ", June 17.1
993) stipulates that the transmission cycle of the time data of the EDS signal is transmitted once every 1 to 10 minutes.
It is not specified to be transmitted at exactly 0 seconds. Therefore, when there is a channel having time data in which the “Z” bit is not set and waiting for the time data in which the “Z” bit is set, until a channel having the time data in which the “Z” bit is set is found. , You might end up waiting for a long time. Conventionally, the clock built in the device is not set until the time data with the "Z" bit set is received. Therefore, the user may have to wait a long time until the clock is automatically set, or may have to manually set the clock.

The present invention has been made in view of such circumstances, and in the first invention, a second reset flag indicating that the second of the time data included in the EDS signal is 0 second is set. By providing the second reset flag identifying means for identifying whether or not there is a second setting flag and the second non-set storage means for storing the identification result of the second reset flag identifying means, the time required for the automatic setting is reduced, and the user manually sets the time. It is an object to provide an automatic time setting device that does not need to be provided. In the second invention, a time data channel storage means for storing a channel of a television signal having an EDS signal including time data, and whether or not a receiving channel is stored in the time data channel storage means. Time data channel identifying means for identifying;
By providing time data transmission channel storage means for storing the time data channel identified by the time data channel identification means, it is possible to provide an automatic time setting device in which the time required for setting the seconds after the automatic setting of the clock is short. With the goal.

[0013] In the third invention, in the state where the second non-set storage means indicates that the second reset flag is not set, the second of the time data included in the EDS signal of the received television signal is set. When the reset flag is set, by providing means for resetting the clock circuit based on the time data, after the automatic setting of the clock, promptly without the user noticing during normal use,
It is an object of the present invention to provide an automatic time setting device capable of correcting seconds. In the fourth invention, when the power is turned off, the channel stored in the time data transmission channel storage unit is selected when the second non-set storage unit indicates that the second reset flag is not set. By providing the means, when the power is turned off after the automatic setting of the clock, promptly without the user noticing,
It is an object of the present invention to provide an automatic time setting device capable of correcting seconds.

[0014]

An automatic time setting device according to a first aspect of the present invention includes a tuner for receiving a television signal and a clock circuit, and an EDS superimposed on a horizontal scanning line in a vertical blanking period from a video signal. In an automatic time setting device for extracting a signal and automatically setting the clock circuit based on time data included in the EDS signal, a second reset indicating that seconds of time data included in the EDS signal is 0 second. A second reset flag identifying means for identifying whether or not the flag is set; and a second non-set storage means for storing an identification result of the second reset flag identifying means. Regardless, the clock circuit is automatically set.

An automatic time setting device according to a second aspect of the present invention includes a time data channel storage means for storing a channel of a television signal having an EDS signal including time data;
Time data channel identification means for identifying whether or not the receiving channel is stored in the time data channel storage means, and time data for storing the time data channel identified by the time data channel identification means. Transmission channel storage means.

In the automatic time setting device according to a third aspect of the present invention, the EDS of the received television signal is stored in a state in which the second non-set storage means indicates that the second reset flag is not set. When the second reset flag of the time data included in the signal is set, a means for resetting the clock circuit based on the time data is provided.

According to a fourth aspect of the present invention, there is provided an automatic time setting device for storing the time data transmission channel when the power is turned off in a state where the second non-set storage means indicates that the second reset flag is not set. Means for selecting a channel stored in the time data transmission channel storage means, when a time data channel stored in the time data transmission channel storage means is received, a second reset flag of the time data channel is set. The present invention is characterized in that the clock circuit is reset according to the present time data.

[0018]

In the automatic time setting device according to the first invention, the second reset flag identifying means determines whether or not the second reset flag indicating that the second of the time data included in the EDS signal is 0 second is set. The identification and second not-set storage unit stores the identification result of the second reset flag identification unit.
Then, the clock circuit is automatically set regardless of the identification result of the second reset flag identification means.

In the automatic time setting device according to the second aspect of the present invention, the time data channel storage means stores an E containing time data.
A channel of the television signal having the DS signal is stored, and the time data channel identification means identifies whether or not the receiving channel is stored in the time data channel storage means. Then, the time data transmission channel storage means stores the time data channel identified by the time data channel identification means.

In the automatic time setting device according to the third aspect of the present invention, the second reset flag identifying means receives the second reset flag in a state where the second non-set storage means indicates that the second reset flag is not set. When it is determined that the second reset flag of the time data included in the EDS signal of the TV signal is set, based on the time data,
Reset the clock circuit.

In the automatic time setting device according to the fourth invention, when the power is turned off in a state where the second non-set storage means indicates that the second reset flag is not set, time data transmission is performed. When selecting a channel stored in the channel storage means and receiving the time data channel stored in the time data transmission channel storage means, the second reset flag of the time data channel is set. The clock circuit is reset according to the time data.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing embodiments thereof. FIG. 1 is a block diagram showing a main configuration of a VTR using the automatic time setting device according to the first to fourth inventions. This automatic time setting device sets the time based on the EDS signal which is one of the additional signals in the vertical blanking period. The television wave captured by the antenna 1 is received and selected by the tuner 2, subjected to signal processing by the video signal processing circuit 14, and output as a video signal. The output of the tuner 2 is provided to the EDS signal processing circuit 4. ED
In the S signal processing circuit 4, only the EDS signal is selectively passed and supplied to the VTR control unit 8.

A VTR control unit 8 having a microcomputer includes a time data channel table 5 for storing time data channels of a television signal having an EDS signal including time data, and a channel received by the VTR control unit 8. Time data channel table 5
A time data transmission channel memory 6 for storing a channel identified to be stored in the clock circuit 9, and a second reset flag (“Z” bit) indicating that the second of the time data used for setting the clock circuit 9 is 0 second. Are connected to a second unset flag 16 for storing whether or not the clock has been set, and a clock circuit 9 for setting the time by the VTR control unit 8. The time data transmission channel memory 6 has an EEPRO
Although it is provided in the M6, it may be provided in the RAM in the microcomputer of the VTR control unit 8.

The VTR control section 8 includes a display control circuit 17 for controlling a display section 18 and a key 13 or a remote control 12.
Control unit 11 for transmitting the operation by the user to the VTR control unit 8
A tuning circuit 3 for controlling the tuning operation of the tuner 2;
Under the control of the TR control unit 8, the tuner 2, the tuning circuit 3, each unit of the VTR, and the power supply circuit 7 for individually supplying power to the automatic time setting device are connected.

The operation of the VTR using the automatic time setting device having such a configuration will be described below with reference to flowcharts 2 to 4 showing the operation. First, when the user instructs the start of automatic tuning time setting using the key 13 (S1), ATS (Auto Tuning Sear).
ch), a channel search is performed from the lowest frequency (S3), and it is determined whether or not the station is a station (there is a broadcasting station using the channel) (S5). As a method of determining whether or not a station is located, it is determined whether or not the input video signal includes a certain number or more of horizontal synchronization signals. If it is not a station (S5), the process proceeds to the next channel search (S15,
S3). If it is a station (S5), the EEPROM 15
(Step S7).

Next, the broadcasting station (channel) information of the EDS signal of the station channel is searched (S9), and if it is not found (received) within a predetermined time (S17), the process proceeds to the next channel search (S15). , S3). When the broadcast station (channel) information of the EDS signal of the broadcast channel is found (received) (S9), the broadcast time (data) table 5 is searched with the broadcast station (channel) information (S11). If the (channel) information is not stored in the time data channel table 5, the process proceeds to the next channel search (S15, S3). When the broadcast station (channel) information is stored in the time-and-time data channel table 5, the channel is set to EEP
It is stored in the time data transmission channel memory 6 in the ROM 15.

Next, when the search of all the channels is not completed (S15), the process proceeds to the next channel search (S3), and the same operation as described above is performed. When the search of all the channels is completed (S15), if there is no channel stored in the time data transmission channel memory 6 (S19), in that state (the time is not set or the previous setting is continued). ) End automatic time setting. If there is a channel stored in the time data transmission channel memory 6 (S19), the channel is selected and received (S21), and the time data of the EDS signal is received (S19).
23). If the time data of the EDS signal cannot be received within the predetermined time (S31), the automatic time setting ends in that state (in a state where the time is not set or a state where the previous setting is continued).

When the time data of the EDS signal of the channel is received (S23), the clock circuit 9 receives the time data.
Is set (S25). At this time, if the second reset flag (“Z” bit) indicating that the second is 0 second in the time data is not set (S2).
7) The second unset flag 16 is set to "1" (S25). If the second reset flag has been set (S27), it means that the time has been accurately set to the second in the time data, and the second unset flag 16 is cleared (S30), and the automatic time setting ends.

When the automatic time setting is completed and the second unset flag 16 is set to "1" (S41),
When the VTR is in the normal use state (S43),
The time / date data channel table 5 is searched with the received channel (broadcasting station) information (S57). When the channel information is stored in the time data channel table 5, a second reset flag ("Z" bit) indicating that the second is 0 second in the time data of the EDS signal of the channel is checked ( S59). If the second reset flag is set (S59), the time of the clock circuit 9 is reset with the time data (S61), and the second unset flag 16 is cleared (S63).

When the automatic time setting is completed and the second unset flag 16 is set to "1" (S41),
When the power supply of the VTR is turned off (S43), the power supplies of the tuner 27 of the power supply circuit 7 and the tuning circuit 3 are turned on (S45). Next, the channel stored in the time data transmission channel memory 15 is selected and received by the tuner 2 and the channel selection circuit 3 (S47), and the ED of the channel is received.
When the time data of the S signal is received (S49), a second reset flag ("Z" bit) indicating that the second of the time data is 0 second is checked (S51). If the second reset flag has been set (S51), the time of the clock circuit 9 is reset with the time data (S53), the second unset flag 16 is cleared (S55), and the tuner 2 and the selection of the power supply circuit 7 are selected. The power of the station circuit 3 is turned off (S5
6).

If the time data with the second reset flag set cannot be received within a predetermined time (S66) (S51), the next channel stored in the time data transmission channel memory 15 is set to the tuner 2 and the channel selection circuit. When the channel is selected and received in S3 (S47) and the time data of the EDS signal of the channel is received (S49), the second reset flag ("Z" bit) indicating that the second of the time data is 0 second is checked. (S51). Hereinafter, similarly, the second reset flag is set until a channel for which the second reset flag is set is found (S51) or until the check of all the channels stored in the time data transmission channel memory 15 is completed (S65). ("Z" bit) is checked (S51).

The second reset flags (“Z”) for all channels stored in the time data transmission channel memory 15
(S65), the power of the tuner 2 of the power supply circuit 7 and the power of the tuning circuit 3 are turned off (S65).
56). In this embodiment, ATS (automatic channel selection = Auto T
Although the automatic time setting in the channel search by uning search has been described, it is needless to say that the present invention can be applied to a manual channel search.

[0033]

According to the automatic time setting device according to the first aspect of the present invention, it is possible to realize an automatic time setting device in which the time required for the automatic setting is short and the user does not need to manually set the time.

According to the automatic time setting device according to the second invention, it is possible to realize an automatic time setting device in which the time required for setting the clock in units of seconds after the automatic setting up to the minute unit is short.

According to the automatic time setting device according to the third invention, after the automatic setting of the clock to the minute unit, the automatic time setting device can quickly correct the second unit without the user noticing during normal use. Can be realized.

According to the automatic time setting device according to the fourth aspect of the invention, after the clock is automatically set up to the minute unit, when the power is turned off, the second unit can be immediately corrected without the user's knowledge. An automatic time setting device that can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a main part of an automatic time setting device according to the present invention.

FIG. 2 is a flowchart showing the operation of the automatic time setting device according to the present invention.

FIG. 3 is a flowchart showing an operation of the automatic time setting device according to the present invention.

FIG. 4 is a flowchart showing the operation of the automatic time setting device according to the present invention.

FIG. 5 is an explanatory diagram showing a configuration example of an EDS signal and time data included therein.

[Explanation of symbols]

 2 Tuner 3 Tuning circuit 4 EDS processing circuit 5 Time data channel table 6 Time data transmission channel memory 7 Power supply circuit 8 VTR control unit 9 Clock circuit 15 EEPROM 16 second unset flag

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G04G 5/00 G04G 7/02

Claims (4)

(57) [Claims] 1. A tuner for receiving a television signal and a clock circuit, extracting an EDS signal superimposed on a horizontal scanning line in a vertical blanking period from a video signal, and based on time data included in the EDS signal. An automatic time setting device for automatically setting the clock circuit, wherein a second reset flag for identifying whether or not a second reset flag indicating that the second of the time data included in the EDS signal is 0 second is set; Means, and a second unset storage means for storing an identification result of the second reset flag identification means, wherein the clock circuit is automatically set regardless of the identification result of the second reset flag identification means. Automatic time setting device. 2. A time data channel storage means for storing a time data channel of a television signal having an EDS signal including time data, and a receiving channel stored in the time data channel storage means. 2. A time data channel identification means for identifying whether or not there is, and a time data transmission channel storage means for storing the time data channel identified by the time data channel identification means. Automatic time setting device. 3. The second reset of time data included in the EDS signal of a received television signal in a state where the second non-set storage means indicates that the second reset flag is not set. 3. The apparatus according to claim 1, further comprising: means for resetting the clock circuit based on the time data when the flag is set.
Automatic time setting device as described. 4. When the power is turned off in a state in which the second non-set storage means indicates that the second reset flag is not set, a channel stored in the time data transmission channel storage means is selected. A time data transmission channel stored in the time data transmission channel storage means. 4. The automatic time setting device according to claim 2, wherein the automatic time setting device is reset.