JPS5925429A - Emergency broadcast receiver - Google Patents

Abstract

PURPOSE:To ensure a simple countermeasure even to a change of a variable pattern code, by setting a variable pattern code necessary for reception of emergency broadcast with an interchangeable cartridge. CONSTITUTION:An emergency broadcast contains a specific pattern code in a signal. A radio or TV set for receiving the emergency broadcast decodes the pattern code with a built-in decoder and delivers an alarm when it detects a pattern code of the emergency broadcast. The pattern code is written in an ROM and incorporated into a cartridge 13. It is impossible for general users to read the contents of the ROM. The user can simply change the pattern code by exchanging the ROM together with the cartridge.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an emergency broadcast receiving device in which a variable pattern hood for verifying a pJ9 pattern code included in an emergency broadcast signal can be set using a freely replaceable cartridge.

Generally, an emergency broadcast receiving device is equipped with a decoder unit that decodes the encoded warning contents in order to determine whether the received signal is an emergency broadcast signal. Emergency broadcast signals include, for example, a fixed pattern code that has a fixed code pattern that is valid nationwide, and a variable pattern code that has a variable code pattern that is valid only in a specific area, but both codes can be used by radio jacks. It is not open to the public in order to prevent malicious interference.

For this reason, if a user has purchased a radio or television set equipped with the above emergency broadcast receiving device, or is using it in another area where the variable pattern code is different, there is a need to check the received variable pattern code in the receiving device. It becomes necessary to change the variable pattern code provided in the . However, in conventional emergency broadcast receiving devices, once the variable pattern code for verification is set, the user cannot change it. There are disadvantages in that users who are no longer able to use the device may have to request repairs from the manufacturer or give up on continuing to use the device they are currently using.

The present invention eliminates the above-mentioned drawbacks by making it possible to set a variable pattern code for collating variable pattern codes included in emergency broadcast signals in a variable pattern code setting circuit using a freely replaceable cartridge. To provide an emergency broadcast receiving device which allows a user to freely exchange a pattern code as required while keeping a pattern code secret.

In order to achieve this object, the present invention provides a variable pattern code that detects whether a 1-variable pattern code included in an emergency broadcast signal and necessary for verification when receiving an emergency broadcast matches a preset variable pattern code. a pattern code match detection circuit;
The gist of the present invention is to provide a variable pattern code setting circuit for setting the variable pattern code using a freely replaceable cartridge.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of the emergency broadcast receiving device of the present invention, and FIG. 2 is a circuit diagram of the main part of FIG. 1.

In FIG. 1, an emergency broadcast receiving device 1 includes a receiving section 2 that receives and demodulates an alarm signal sent over broadcast radio waves, and a decoder section 3 that decodes the alarm signal received by the receiving section 2.
, an alarm output drive section 4, etc.

A time signal is usually an emergency broadcast signal broadcast from public or private broadcasting stations on a regional or national level when a natural disaster such as an earthquake or typhoon occurs, or when a large-scale man-made disaster occurs. It is encoded inside and transmitted, and a digital signal is used.

The receiving section 2 includes a waveform shaping circuit 2a that shapes the waveform of the alarm signal input, and an FSK demodulation circuit 2b that demodulates the waveform-shaped rear axis signal.

The decoder section 3 includes a fixed pattern code/number configuration circuit 3a.
It has a Yoshimachi odd pattern code-number configuration circuit 3b1, a fixed pattern code setting circuit 13a, and an old variable pattern code setting circuit 13b. The fixed pattern code-number configuration circuit 3a determines whether the code is included in the alarm signal tuned by the FSK post-tuning tuning circuit 2b or matches a predetermined fixed pattern code set in advance by the fixed pattern code setting circuit 13a. This is to detect. The variable pattern code number configuration circuit 13b determines whether the code included in the alarm signal demodulated by the FSK demodulation circuit 21 matches the variable pattern code set in advance by the variable pattern code setting circuit 13b. It is something to detect.

The alarm output drive section 4 includes -number output circuits 3a and 3b.
When both or only 3a detect a coincidence of signal codes, it operates and outputs an alarm. Therefore, when an emergency situation occurs and an emergency broadcast is broadcast from a broadcasting station,
The jurisdictional signal power is sent to the decoder unit 3 via the receiving unit 2,
The alarm output drive section 4 is operated by the code scattering output from the fixed pattern code-multiple circuit 3a or the oJ variable pattern code-multiple circuit 3b or only 3a, and an alarm output is obtained.

In this embodiment, the variable pattern code setting circuit 13b is packaged using a II, 0M cartridge 13, which is a read-only storage means, as shown in FIG. Variable pattern code setting circuit 13b to be set by changing
This allows you to change the contents at will. In general, there are regional codes with different contents depending on the region, but there are representative tS of variable pattern codes.
By simply changing the cartridge 13, a region code unique to the place of use can be set, so there is no need to ask the manufacturer for modification every time the place of use is changed. In addition, since the contents of the variable pattern code are stored in the It, OM cartridge 13, the contents can be kept secret from the general user, thus avoiding malicious radio interference caused by radio jacks. can.

1.7 is +? , 0M Car 1 - A car for detecting whether or not the IJ cartridge 13 is installed) This is an IJ installation detection section, and uses a microswitch that opens when the R, 0M cartridge 13 is not installed. ,
When it is opened, the alarm output drive section 4 is activated by the output of only the variable pattern code/number configuration circuit 3b.

15 and 16 are buffer circuits for the variable pattern code read out from the ROM car cartridge (3).

As explained above, in the emergency broadcast receiving device of the present invention, the variable pattern code required for verification when receiving an emergency broadcast is set in a freely replaceable cartridge. Even if it is predicted that the conventional variable pattern code cannot be matched, the user can immediately receive the warning signal included in the emergency broadcast number by replacing the cartridge. In addition to eliminating the hassle of exchanging pattern codes, anyone can use it anytime, anywhere.
This provides excellent effects such as making it possible to prevent alarm signals from being overheard during emergency broadcasts.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the emergency broadcast receiving device of the present invention, and FIG. 2 is a circuit diagram of the main part of FIG. 1. ■...Emergency broadcast receiving device, 2...Tune receiving section, 3...Tekota section, 3b...Old...Variable butter 7: l-1-' match Detection circuit, 13b Flexible variable pattern code setting circuit, 13... ROM cartridge.

Claims (1)

[Claims] When an emergency broadcast is received by an emergency broadcast receiving device that receives an emergency broadcast by collating an emergency broadcast signal encoded with warning contents using a code pattern, a fixed fixed pattern code t' code pattern, or a variable variable pattern code, A variable pattern code-number circuit that detects whether the variable pattern code included in the emergency broadcast signal necessary for matching the emergency broadcast signal matches a preset variable pattern code, and a variable pattern code that can be freely exchanged. An emergency broadcast receiving device comprising a variable pattern code setting circuit that is set using a cartridge.