JPH043680A - Teletext receiver with loadable/unloadable card for memory extension - Google Patents

Abstract

PURPOSE:To prevent a card extracted accidentally by issuing an alarm in message or sound when touching the card by always outputting a check signal from a timer to the system microcomputer of a video/audio switching control part, and detecting the presence/absence of a signal from a sensor at a card side at a constant cycle. CONSTITUTION:The signal from the sensor 42 in the card 7 for memory extension is always checked by the system microcomputer 13 in the video/audio switching control part 3, and the sensor 42 is operated and the signal is outputted when a person touches the card 7 while a CPU 21 is operated by proper software in a ROM 37 in the card 7 for memory extension. The system microcomputer 13 judges the signal, and the signal to instruct the display of an alarm message and the output of an alarm tone to the CPU 21 is outputted, and the alarm message and the alarm tone are displayed/outputted from a CRT, etc., by the same function as the one to display a character image from the CPU 21. Thereby, it is possible to prevent the card extracted accidentally.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a teletext receiving device configured to prevent a memory expansion card for page expansion, software expansion, etc. from being accidentally removed. .

[Conventional technology]

The memory (RA) built into conventional teletext receivers
M and ROM), their functions were predetermined by their capacities. In other words, in order to provide many functions, a large capacity memory is required, but the cost of memory accounts for a large proportion of the total cost of the device. The model was prepared.

[Problem to be solved by the invention]

Providing a wide variety of models as in the past makes it difficult for manufacturers to manage the demand and parts, and from the user's perspective, they must seek different models in order to improve functionality. There was a lot of waste.

In order to solve these problems, the present invention aims to provide a memory device whose functions can be changed simply by replacing the memory expansion card, but which does not allow the expansion card to be accidentally removed. .

[Means to solve the problem]

In the present invention, a memory expansion card is removably attached to a teletext processing unit, wherein the memory expansion card includes a memory expansion RAM, a program expansion ROM, and a sensor, and a video/audio switching control unit includes a memory expansion card, a program expansion ROM, and a sensor. The system microcomputer is equipped with a system microcomputer that checks the signal from the sensor at predetermined intervals, and when the system microcomputer detects the signal from the sensor, it sends a signal that instructs the CPU in the teletext processing unit to display a warning message or output a warning sound. It was designed to produce the following.

[Effect]

In the video/audio switching control section, the system microcomputer constantly checks the signal from the sensor in the memory expansion card (for example, every 0.1 seconds). Here, if a person touches this card while the CPU is operating on the ROM in the memory expansion card using its own software, the sensor will operate and output a signal, so the system microcontroller will determine this. It outputs a signal instructing the CPU to display a warning message or output a warning sound. A warning message or warning sound is displayed/outputted from the CRT or the like by the same action as displaying a character image from the CPU, thereby preventing the card from being removed by mistake.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

First, teletext reception will be explained with reference to FIG.

(1) is an RF modulator for controlling RF double signal switching, (2) is a tuner circuit for tuning and intermediate frequency amplification, (3) is a video/audio switching control section, (4) is a teletext processing section, (5) is a remote control receiver, (6) is a remote control,
(7) is a memory expansion card.

The RF modulator (1) is equipped with an RF signal input terminal (8) from a television antenna and an RF signal output terminal (9) for an RF multiplied signal.

The video/audio switching control section (3) includes an audio multiplex decoder (
10), analog switch (In, RGB encoder 0
In addition to a small system microcomputer 03), a nonvolatile RAM 04), an RGB 21 bin connector Q5), and other connectors are provided. In addition, this video/audio switching control section (
3) has a CR connected to the 21-pin connector 05).
CRQ7) for storing and reproducing original video tapes, video cassettes, etc., stereo, bilingual, and other data display section 08) are combined.

The teletext processing unit (4) includes a waveform equalization circuit θg), a teletext data reception IC12[D, CPU (21
), P (program) ROM (22), gate array (
23), program RAM (24), non-volatile RAM (
25), Teletext composite processing IC (26), Gate array (27), ■ (Video) RAM (28), C
A C (character generator) ROM (29), a printer I/F (30), an audio signal filter and amplifier (31), a card connector (32), and other connectors are provided. In addition to the card (7), a printer (33) is connected to this teletext processing unit (4).

The operation of the above configuration will be explained.

A. First, the video signal path will be explained.

The signal is inputted from the antenna to the RF modulator (1) via the RF signal input terminal (8), and further sent to the tuner circuit (2). This tuner circuit (2) converts the signal into an intermediate frequency signal and sends it to the video/audio switching control section (3).

(a) When viewing general TV broadcasts, the signal is sent to the CRTO 6) via the analog switch OD and 21-pin connector 05), and displayed on this CRTQω.

(b) When recording to VCRO7), go from analog switch 01) to RGB encoder 0i to VCR07)
Recorded at.

(c) When sending the RF multiplied signal to an external device other than the VCR, the signal is output from the ROB encoder 02), via the RF modulator (1), and from the RF signal output terminal (9).

(d) In the case of teletext, the signal input to the video/audio switching control section (3) is directly transmitted to the teletext processing section (
4) is sent to the waveform equalization circuit 09). This waveform equalization circuit 0
In 9), after performing waveform shaping such as ghost removal according to the command from the CPU (21), the teletext data receiving ICI 21
) performs error correction and generates sampling pulses for data capture, and this signal is sent to the program RAM (24) via the gate array (23). This program RAM (
24) constitutes a ring buffer and stores it by exchanging new data one after another. Here, when a certain program is selected using a control signal from a remote controller (6), which will be described later, the VRA
Store in M (28). This V RAM (2B)
The data is sent to the video/audio switching control unit (3) via the text broadcasting composite processing IC (26), and is sent to the C via the 21-bin connector (15) of the video/audio switching control unit (3).
It is sent to RTQω and the character image is displayed.

(e) For VCR recording of character images, the teletext processing unit (
4) to the RG of the video/audio switching control section (3).
It is encoded by B encoder 02) and sent to VCR07).

When outputting the RF ratio of a character image, similarly, the signal encoded by the RGB encoder 02) is sent to the RF modulator (
1) and output from the RF signal output terminal (9).

(6) When printing character images, V RAM (2
8) to the teletext composite processing IC (26),
Gate array (27), printer I/F (30)
The data is output to the printer (33) and printed.

B. Next, the route of the audio signal will be explained.

(a) The signal is input from the antenna to the RF modulator (1) via the RF signal input terminal (8), and further sent to the video/audio switching control section (3) via the tuner circuit (2). In this video/audio switching control section (3), the signal is sent to the analog switch OD via the audio multiplex decoder 0
The broadcast audio signal and the teletext audio signal described in (b) below are switched.

Since the teletext audio signal is stored together with the video signal in the program RAM (24) of the teletext processing unit (4), it is stored in the teletext composite processing IC (26).
), and only the audio signal is sent to the analog switch 00 of the video/audio switching control section (3) via the audio signal filter and amplifier (31).

(C) Either one of the audio signals selected by the analog switch 00 is first sent to the CRTO6) via the 21-pin connector 00, secondly sent to the VCRQT), and thirdly sent to the RF modulator ( 1) is output from the RF signal output terminal (9).

C1 Next, the route of the control signal from the remote controller (6) will be explained.

A signal from the remote control (6) is received by the remote control receiving section (5) and input to the system microcomputer 0■ of the video/audio switching control section (3). The system microcomputer side performs the following control.

(a) Send a switching signal to analog switch 01) to switch between a normal TV broadcast audio signal and a teletext audio signal.

(b) Send a switching signal to the analog switch OD to combine the video signal from the tuner circuit (2) and the teletext processing unit (
4) Switch the teletext synchronization signal from 4).

(C) Channel selection control of the tuner circuit (2) is performed based on the channel data of the nonvolatile RAM Q41.

(d) Gate array (23) of teletext processing unit (4)
) to the CPU (21) to instruct teletext program selection, printing, audio control, etc.

(e) Command the audio multiplex decoder 0ω to
Switch sub.

(f) Control the display by commanding the display section.

In the above device, the present invention has a function of preventing the memory expansion card (7) from being accidentally removed from the teletext processing section (4). As shown in Figure 1,
The memory expansion card (7) has an expansion ROM (37
), an expansion RAM (34), and a sensor (42), as well as an expansion ROM terminal (40) and an expansion RAM terminal (with/with and without an end) (5).

Furthermore, the sensor (42) of the memory expansion card (7) is located on the system microcomputer side of the video/audio switching control section (3).
), and is provided with a timer (41), which outputs a check signal at intervals of, for example, 0.1 seconds or 1 second.

The operation in such a configuration will be explained.

(1) Insert the memory expansion card (7) into the teletext processing unit (4), and if the expansion ROM (37) of the memory expansion card (7) is operating, this expansion ROM
It is assumed that the CPU (21) is running with its own software according to (37). At this time, the teletext processing unit (4)
If you remove the memory expansion card (7) from the CP
U (21) has gone out of control and cannot be restored unless the power is removed.

However, in the present invention, the system microcomputer 0ω of the video/audio switching control section (3) receives a check signal from the timer (41), and the sensor (
The presence or absence of a signal from 42) is constantly monitored. and,
When this system microcomputer side detects that a person has touched the memory expansion card (7), the teletext processing section (
4) A signal instructing the CPU (21) to display a warning message or output a warning sound is output. Therefore, messages and sounds are displayed/outputted from the CRT etc. through the same route as that for displaying character images from the CPU (21), thereby preventing the card from being accidentally removed.

〔Effect of the invention〕

As described above, the present invention constantly outputs a check signal from the timer to the system microcomputer of the video/audio switching control unit to detect the presence or absence of a signal from the sensor on the card side at a fixed period. When the card is touched, a message or sound will be issued to warn you, preventing the card from being removed by mistake.

[Brief explanation of drawings]

FIG. 1 is a block diagram of essential parts of a teletext receiving apparatus according to the present invention, and FIG. 2 is a block diagram of the entire teletext receiving apparatus. 1-・-RF modulator, 2- tuner circuit, 3-
・Video/audio switching control section, 4- Teletext processing section, 5-
− Remote control receiver, 6・−゛ Remote control, 7・−・−
Memory expansion card, 8-RF signal input terminal, 9...
RF signal output terminal, 10 - Audio multiplex decoder, 11
・−・−Analog switch, 12・RGB encoder,
13--System microcomputer, 14--Nonvolatile RAM,
15-21 pin connector, 16--- CRT, 1
7--VCR, 1B display unit, 19 - Waveform equalization circuit, 20- Teletext data reception IC, 21-C
PtJ, 22 PROM, 23 - Gate array, 24
- Program RAM, 25 - Non-volatile RAM, 26 Teletext composite processing IC127 - Gate array, 2B
-VRAM, 29 - CGROM, 30 printer I/
F, 31-・Audio signal filter and amplifier, 32-
Card connector, 33- Printer, 34- Expansion RAM, 35- Expansion RAM with/endless terminal 7
- Expansion ROM, 40-Expansion ROM presence/absence terminal,
41- Timer, 42... Sensor patent applicant Fujitsu General Ltd.

Claims (2)

[Claims] (1) A memory expansion card is removably attached to the teletext processing unit, wherein the memory expansion card is equipped with a memory expansion RAM, a program expansion ROM, and a sensor, and the video/audio switching control unit is equipped with the memory expansion card. It is equipped with a system microcomputer that checks the signal from the sensor at predetermined intervals, and when this system microcomputer detects the signal from the sensor, it issues a signal instructing the CPU in the teletext processing unit to display a warning message or output a warning sound. A teletext receiving device with a removable memory expansion card, characterized in that: (2) A teletext receiving device with a removable memory expansion card, characterized in that the sensor is a temperature sensor.