JPS58209233A - Time display system - Google Patents

Abstract

PURPOSE:To display time on a time display incorporated into a receiver, by detecting and separating time information transmitted in multiplexing with main information by a decoder. CONSTITUTION:In PCM broadcast, for example, an analog signal is converted into a digital signal at an A/D converter 6 at the trasmission side, a standard time generator 7 generates the time information, the main information and the time information of an output of the A/D converter 6 are coded by an encoder 8, the modulation is done by a modulator 9 and the coded information is transmitted to a transmission line via an antenna 23. The information through a transmit ter is demodulated by a demodulator 10 via an antenna 24 at the receiving side, and separated into the main information and the time information at a composite separator 11. The main information is converted into an analog signal by a D/A converter 12 and outputted to a terminal 30. The time is displayed from the time information on the display 13.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for displaying time in a multiplex broadcasting receiver, particularly in a single receiver that receives a signal on which time information is multiplexed.
This invention relates to a time display device.

In order to display the time by incorporating a time display device i into a receiver, as shown in Fig. The oscillation frequency of the crystal oscillator 1 is divided by the oscillation frequency of the crystal oscillator 1, and the time is displayed by counting. If you display the time using this method, you can watch it even if you are not listening.

Since the time is determined by an internal crystal oscillator, there may be an error with the oscillation frequency setting of the crystal oscillator.

There will be an error in the displayed time. If an error occurs in the time, there is a problem in that the counter value must be reset to the correct time.

The present invention aims to eliminate the drawbacks of the conventional technology by multiplexing and transmitting time information and displaying this time information on a receiver, and furthermore, to provide a single time display device that automatically corrects the displayed time. be.

In the present invention, it is assumed that time information is multiplexed and radio waves are transmitted, and the receiver displays the time based on the time information included in the received information.

Furthermore, even after the reception ends, the current time is displayed based on the time displayed at the end of the reception, and the time is automatically corrected.

FIG. 2 shows an embodiment of the present invention. Figure 2 shows pct(F
LLtzy cocLg modulation) In an example where the present invention is applied to broadcasting, 1.
A converter 6 converts the υ analog signal into a digital signal, a standard time generator 7 generates time information,
The main 1# signal and time information output from the A/'Df vague device 6 are encoded by the encoder 8, modulated by the modulator 9, and sent to the transmission path via the amplifier and +23. do. On the receiver side, the information that has passed through the transmission path is demodulated by the LX unit 10 via the antenna 24, and separated into main information and time information by the No. 1 separator 11. Main information is D/A converter 12
The signal is converted into a digital analog signal and output to the terminal 50. The time information is displayed on the display device 15.

FIG. 3 shows another aspect of the present invention; the transmitter side is omitted and only the receiver side is shown. In this example, the receiver has a clock device 27 so that the time can be displayed even when the main power switch 16 of the receiver is turned off. Watch #
127 and the display device 13 are not shown in FIG. 3, but are assumed to operate even when the main power switch 16 is turned off by using a battery or the like. Therefore, when the main power switch 16 is connected to the (α) side and power is supplied from the line voltage of 100, the switching device 25 is connected to the (α) side.
If connected to the α) side, the time information that has been transmitted can be displayed, and the main power switch 16 will be connected to the (b) till Ic
Even if it is connected and turned off, by connecting the switching device 25 to the tbl side, the time marked by the clock device 27 can be displayed on the display H1It15. In this example, if the main power switch 16 and the switching device 25 are made to operate in conjunction with each other, when the main power switch 16 is on, the transmitted time information is transmitted, and when the main power switch 16 is off, the transmitted time information is It is also possible to switch to displaying the time marked by the clock device 27.

FIG. 4 is a diagram showing another embodiment of the present invention, and is an example in which the clock device 27 shown in FIG. 3 is realized by a microcomputer. is omitted. Switching device t17ri in Fig. 4
This switching device 117 replaces the switching device i25 of FIG. 5, and is operated in conjunction with the main power switch 16 of FIG.

That is, when the main power switch 16 is connected to the (α) side, the switching device 17 is also connected to the (α) side, and when the main power switch 16 is connected to the (b) side, the switching device 17 is also connected to the t&j side. shall be The operation will be explained in detail below using the flowchart shown in FIG. The main power switch 16 is (α
) side, that is, when the switching device 1i17
is connected to the (α) side, the clock unit consisting of a microcomputer [(hereinafter referred to as microcomputer for the sake of explanation) 27r! , the switching device t17 (hereinafter referred to as y') determines whether it is "high level" or "low novel" in step (2).

When 5F is high level, the time information υ output buffer 18 of the decoding separator 11 is transferred to the arrangement device JIIj9 (hereinafter referred to as memory and "t") of the microcomputer 27 in step (2). At this time, H and h are the time information υ , M and m are minutes, S and z are seconds, and X and x are seconds.

After this, in step 2, fl, , M, and S in the memory 19 are transferred to the output buffer 21, and in step 2, the output buffer 21 is transferred to the output buffer 21.
The contents of y are displayed on the display device 15, and it is again determined whether y is at high level or low level, and the above operation is repeated. When J is at a low level in step (2), the arithmetic unit 20 in the microcomputer 2 counts clock pulses of the internal clock generator 22 in step (2).
After counting the number corresponding to +0 seconds, add 1 to X in the memory 19 in step ①. If X<10 in step (2), it is determined again whether y is at a high level or low level, and if X-10 in step (2), one second has elapsed. So,
In step ■, add 1 to S and set X to 0. Next, if S<60fx in step 0, the process goes to step (2), the contents of the memory 19 are transferred to the display buffer 21, and the contents are displayed on the display device 13 in step (2). 5-60 in step [phase]
In that case, one minute has passed, so in step ◎, add 1 to M and ceratos S to O. Next, step @
If M<60, the process proceeds to step (2), where the contents of the memory 19 are transferred to the display buffer 721, and the contents of the memory 19 are transferred to the display buffer 721, and are displayed on the display device 15 at step C. If it is M-60 in step @, it means that 1 hour has passed, so set 1 to H in step [phase] to 1M.
Set to 0. In step @, when H<24, step ■
When B=24 at step @ where the time is displayed on the display device 16 after step ■, B is displayed at step [phase].
Set to O and display in the same way.

By performing the above operation, the microconbeater 27 does not keep time using the internal clock generator 22 even when the receiver is not receiving broadcast waves, and even if an error occurs in the displayed time, When the main power switch 16 of the receiver is turned on, the switching device [17 is also synchronously set to "high level".
Therefore, the contents of the memory 19 are rewritten with the transmitted time information, and the time is automatically set and corrected. Further, even if the piezoelectric power switch 16 is turned off, the clock operation continues based on the clock of the internal clock generator 22 based on the time information received up to that point.

Although the embodiments of the present invention have been described using a case in which time information is digitally multiplexed in PCM broadcasting, it is not limited to PCM broadcasting, and a method of multiplexing time information in the frequency domain may also be used in conventional broadcasting. is clear.

According to the present invention, since the correct time information is sent from the broadcasting station, the time at home can also be displayed correctly, and the time displayed on the receiver can be automatically set and corrected, making it possible to automatically set and correct the time displayed on the receiver. When an error appears in the displayed time,
This has the advantage of eliminating the need to reset the display time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional time display device, FIG. 2 is a diagram showing an example of a time display system according to the present invention, FIG. 5 is a diagram showing another embodiment of the present invention, and FIG. 4 is a diagram showing an example of the present invention. FIG. 5 is a flowchart of the microcomputer of the embodiment shown in FIG. 4. 1: Crystal oscillator, 2: Frequency divider, 3: Counter, 4: Decoder. 5: Display, 6: -41D converter, 7:
Standard time generator, 8, encoder, 9: modulator, 10: demodulator, 11: decoding separator. 12: D/A converter, 15: display device, 16: main power switch, 17: switching device. 18: Output buffer, 19: Memo 11.20; Arithmetic unit,
21. Output) Kutufa. 22, internal ripple generator, 2ro: antenna, 24: antenna. 25: Dissection device, 27: Clock device. Representative Patent Attorney Susuki 1) Yuki Toshi

Claims (1)

[Claims] 1. A transmitter that multiplexes time information with main information and transmits the same, a decoder that receives a transmission signal from the transmitter, detects and separates the time information, and displays the time information. A time display system similar to a receiver having a display device. 2. A receiver equipped with a decoder that receives a transmission signal including time information, detects and separates the time information, and a display device that displays the time information. A switching device that operates in conjunction with a power switch of the receiver and a clock device that operates even when the power switch of the receiver is off, and when the power switch of the receiver is on, the received time is A time display system characterized in that the time of the clock device is displayed when the power switch is off. 5. In a receiver that receives a transmission signal containing time information, a decoder that detects and separates the time information, a storage device that temporarily stores the time information for display, and a storage device that continuously outputs the time information from the storage device. A display device for displaying the time information, a clock device and a switching device that share the time information portion of the storage device and operate even when the receiver stops receiving the transmission signal, and a switching device that displays the transmission signal by the switching device. While receiving the signal, the time information is displayed, and when the reception is stopped (d) the clock device displays the time based on the time information recorded in the device 1 at the time the reception is stopped. A time display system characterized in that the correct time is automatically set when the receiver receives a transmission signal.