JPH0368576B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a channel selection control device for a television receiver having a built-in emergency warning broadcast receiver.

Prior Art The configuration of an example of a conventional emergency warning broadcast receiver is shown in the second example.
As shown in the figure. This is because it is necessary to constantly receive TV audio, so the standby power supply 7 is used to enable the tuner 2 to receive the tuner 2 on a predetermined channel, a tuning circuit 3, and a control circuit A4 that controls the tuning. , and supplies power to the video intermediate frequency amplification/detection section 5 and the audio intermediate frequency amplification/detection section 5. The detected audio signal a is supplied to an emergency warning broadcast reception decoder 6 and an audio amplification output stage 8. Since the emergency warning broadcast reception decoder 6 also needs to be in operation at all times, it is supplied with power by the standby power supply 7.

When the emergency warning broadcast is received, the control circuit B1 is activated by the control signal b from the emergency warning broadcast receiving decoder 6.
0 and supplies power from the standby power source 7 to the audio amplification output stage 8 so that the emergency warning broadcast can be audible through the speaker 11. When a viewer turns on the power switch of the television, the control circuit A detects the operation and controls the power supply circuit 9 to supply power to the video processing and deflection processing circuits, and the rest of the television receiver is turned on. All circuits become operational. At this time, the control circuit A4 detects that the power supply circuit 9 has operated, and sends a control signal C to the control circuit B10, so that power to the audio output stage 8 is also supplied.

The control circuit of a television receiver with a built-in emergency warning broadcast receiver having such a configuration is shown in more detail in FIG. A key matrix circuit 13 is connected to a group d of input ports of the microcomputer 15, and keys for instructing channel positions, keys for turning on/off the power, etc. are arranged in a matrix. A group e of I/O ports of the microcomputer 15 is connected to the memory 16 and the channel selection circuit 3. Memory 16 is non-volatile memory or battery backed up memory. The tuning circuit 3 is composed of a D/A converter, a Pandoratz circuit, and a low-pass filter, and is adapted to apply a tuning control voltage and a high band and low band switching voltage between UHF and VHF to the electronic tuning tuner. The power supply clear circuit 14 applies a signal so that the microcomputer 15 does not operate until it returns to normal operation after a certain period of time after the power from the standby power supply 7 is applied to the microcomputer 15.

The output terminal f of the microcomputer 15 is connected to the memory 16, and the writing to the memory 16,
It is designed to control reading. memory 16
are the areas M ₁ to _{M o} that store channel data,
Address L that stores the channel position during channel selection
and the address W for storing channel data of the standby channel position indicating the emergency warning broadcasting channel.
and an address P for storing the power on/off state, and when no particular control is performed, writing and reading are performed sequentially starting from area _M1 . The microcomputer 15 has key sense, and when the power key of the key matrix circuit 13 is pressed, if address P of the memory 16 indicates power off, power is applied to the output terminal h of the microcomputer 15. If the address P of the memory 16 indicates that the power is on, a control signal that turns off the power is output to h.

When the microcomputer 15 turns on the power, it reads the contents of address L in the memory 16, sends the channel data that was being selected immediately before the power was turned off to the channel selection circuit 3, and sends the channel data that was being selected immediately before the power was turned off. Same channel (hereinafter referred to as last channel)
It has become possible to receive images.

Also, when the microcomputer 15 turns off the power, it reads the contents of the address W of the memory 16,
The channel date of the standby channel position indicating the emergency warning broadcasting channel is sent to the selection circuit 3. The channel data of this standby channel position is written into address W of the memory 16 by the microcomputer 15 by operating an emergency warning broadcast channel storage key (not shown) of the key matrix 13 in advance at the time of presetting. As described above, when an emergency warning broadcast is received, the selection circuit 3, standby power supply 7, control circuit B10, etc. function so that the emergency warning broadcast channel can be received.

Problems to be Solved by the Invention However, in a television receiver with a built-in emergency warning broadcasting receiver having this conventional configuration, a memory address is required to store the position of the emergency warning broadcasting channel as the standby channel position. This increases memory costs and requires a switch to memorize the position at the time of presetting.

Further, even during the channel selection operation, the processing becomes complicated, as the channel data is skipped over memory addresses such as M ₁ to _{M o} to read out the W address of the standby channel.

Furthermore, television receivers use high voltage in their cathode ray tubes. This high voltage can cause internal discharge in the cathode ray tube and destroy the memory contents. It has drawbacks such as not being able to receive emergency alerts while on standby.

The object of the present invention is to provide a device that eliminates these drawbacks.

Means for Solving the Problems The television receiver with built-in emergency warning broadcasting receiver of the present invention is configured such that if the address P storing the power on/off state of the memory indicates the power off, that is, the television receiver is in standby mode, The data in the first position _M1 of the memory where the emergency warning broadcast channel data is stored is immediately read out and sent to the channel selection circuit.

Effects According to the television receiver of the present invention, if there is an emergency warning broadcast during standby, it can be reliably received.

Embodiment FIG. 1 shows the configuration of a television receiver according to an embodiment of the present invention. The basic configuration for receiving the emergency warning broadcast is exactly the same as that shown in FIG. 2, and the difference between this embodiment and the conventional example is that it corresponds to the control circuit A in FIG. 2 that controls the channel selection operation. This is circuit 19. In the figure, memory 18 is a non-volatile memory, and is an area for storing channel data.
M ₁ /M _o , an address L for storing the currently selected channel position (last channel), and an address P for storing the power on/off state. The address L storing the channel position being selected by the microcomputer 17 is rewritten each time a channel selection operation is performed, and the address P is rewritten each time the power is turned on and off.

Microcomputer 17 is key matrix 1
3, each time a specific channel is selected by the channel selection circuit 3, the channel data in the memory 18 is transferred to the channel selection circuit 3.
(stored at addresses M ₁ to _{M o} ). The channel selection circuit 3 has the same configuration as that explained in FIG.

When the power key of key matrix 13 is pressed,
The microcomputer 17 reads the contents of the address P of the memory 18, and if the power is on, outputs a control signal to turn off the power, thereby cutting off the power supply circuit 9. Thereafter, the microcomputer 17 automatically transfers the channel data of _M1 in the memory 18 to the channel selection circuit 3. Therefore, when the power is cut off and the television receiver with a built-in emergency warning broadcasting receiver is in standby mode, the channel in position 1 is always being received, and the channel providing the emergency warning broadcasting service is always being received in position 1. If this is stored, whenever an emergency warning broadcast is transmitted, the broadcast will be received by the emergency warning broadcast receiving decoder.

When the standby power supply 7 is cut off due to a power outage, etc.,
Next time the standby power supply 7 starts up, the power supply clear circuit 1
Microcomputer 1 after a certain period of time according to 4.
7 becomes operational again, the microcomputer 17 first reads the contents of address P in the memory 18, and if the power is off, that is, in the standby state, the channel data of position ₁ of M1 is sent to the channel selection circuit. 3, select the station that is broadcasting the emergency warning, and enter the reception standby state. memory 1
If the contents of the address P of 8 indicate that the power is on, the address L is read out, the last channel data is transferred to the channel selection circuit 3, and the viewer selects the channel that was being selected last.

The power supply circuit 9 has the same configuration as the conventional example, and is controlled by the output h from the microcomputer 17 by a power relay or the like. Standby power supply 7,
The power supply clear circuit 14 has the same configuration as the conventional example,
A group d of input terminals, a group e of output terminals, and a group of output terminals f of the microcomputer 17 are also the same as those shown in FIG. In this way, without providing a special address in the memory 18 for receiving emergency alerts, when the power supply circuit 9 is off, the station is selected from position 1, and when the power supply circuit 9 is turned on, the station is selected from the last channel. .

Effects of the Invention As described above, according to the present invention, it is possible to receive emergency warning broadcasts while on standby without providing a special address for emergency warning broadcasts in the memory or without attaching a structure such as a switch. It can be set automatically every time the viewer turns off the power.
This is useful because it eliminates the need to tune in to a station providing emergency warning broadcasting service and then disconnect.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a channel selection control circuit of a television receiver according to an embodiment of the present invention, FIG. 2 is a block diagram of a conventional television receiver with a built-in emergency warning broadcast receiver, and FIG. FIG. 3 is a block diagram of the channel selection control circuit. 2...Tuner, 3...Tuning selection circuit, 4...Control circuit A, 6...Emergency warning broadcast reception decoder, 7
... Standby power supply, 8 ... Audio amplification output stage, 9 ... Power supply circuit, 10 ... Control circuit B, 11 ... Speaker, 13 ... Key matrix circuit, 17 ... Microcomputer, 18 ... Memory.

Claims (1)

[Scope of Claims] 1. An emergency warning broadcast receiving circuit that inputs an audio detection signal, a standby power supply circuit provided separately from the power supply circuit of the television receiver body, a memory in which channel selection information is stored, and a key. A control system having a microcomputer operated by a matrix circuit, which controls the channel selection circuit based on the channel selection information stored in the memory, and controls power on/off of the television receiver based on the power on/off information stored in the memory. comprising a control means for outputting a signal, an audio signal amplification circuit and a speaker for amplifying the emergency broadcast signal from the emergency warning broadcast receiving circuit and making it audible, the emergency warning broadcast receiving circuit, the control means and a television receiver; The standby power circuit described above constantly supplies power to the tuner section, channel selection circuit section, video and audio intermediate frequency amplification and detection circuits of the television receiver, regardless of whether the television receiver itself is powered on or off. It has an address that stores the channel that was being selected immediately before the viewer turned off the power to the television receiver, and the TV receiver can be watched again while the power on/off information in the memory indicates that the power is on. When the main unit is powered on, the channel immediately before being disconnected is received, and when the power on/off information in the previous memory indicates power off, that is, in the standby state, the first channel selection information in the previous memory is received. A television receiver characterized in that a channel corresponding to a position is received, and an emergency broadcast reception channel is set at the first position.