JPH043681A - Teletext receiver with removable memory expansion card - Google Patents

Abstract

PURPOSE:To prevent runaway or malfunction occurring by comprising the receiver so as not to draw in and out a card suddenly by controlling an electronic lock with the system microcomputer of a video/audio switching control part. CONSTITUTION:The card 7 for memory extension is equipped with a RAM 34 for memory extension and a ROM 37 for program extension, and the video/ audio switching control part 3 is equipped with the electronic lock 42 and the system microcomputer 13 to control the electronic lock. The electronic lock 42 is controlled by the system micromomputer 13 in the video/sound switching control part 3 while a CPU 21 is being operated by proper software in the ROM 37 in the card 7 for memory extension. In other words, the card 7 for memory extension is locked so as not to be drawn out when the card 7 for memory extension is inserted to a teletex processing part 4, and the card 7 for memory extension can be locked even when it is inserted suddenly. Thereby, the runaway and the malfunction can be prevented occurring.

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 and a program expansion ROM, and the video/audio switching control unit is equipped with an electronic lock. and a system microcomputer that controls this, and this system microcomputer controls switching between the ROM in the teletext processing section and the ROM in the memory expansion card, and also prevents the memory expansion card from being removed. be.

[Effect]

In the video/audio switching control section, the system microcomputer controls an electronic lock using proprietary software in the ROM in the memory expansion card while the CPU is in operation, so that the memory expansion card cannot be removed.

〔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) is an audio multiplex decoder O.
ω, analog switch O1), RGB encoder 0, system microcomputer Q3), non-volatile RAM (141, RGB 21-pin connector 05), and other connectors. In addition, this video/audio switching control section (3
) has a C RT connected to the 21-bin connector 0S.
For playing back memories of original video tapes, video cassettes, etc.■C
RQTI, stereo, bilingual, and other data display sections Oa are combined.

The teletext processing unit (4) includes a waveform equalization circuit 09), teletext data reception rc (c), CPU (21), P
(Program) ROM (22), gate array (23)
, program RAM (24), non-volatile RAM (25)
, complex processing IC for teletext broadcasting (26), gate array (27), ■ (video) RAM (28), CG (character generator) ROM (29), printer I
/F (30), audio signal filter and amplifier (3
1), a card connector (32), and other connectors. In addition to the card (7), a printer (33) is connected to this teletext processing section (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 watching general TV broadcasts, connect analog switch Ql), 21-pin connector 05) to CRTO6)
and is displayed on this CRTQω.

(b) When recording to VCR (17), go from analog switch OD to RGB encoder 0 to VCR07)
Recorded at.

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

(b) 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 09
Then, after performing waveform shaping such as ghost removal in accordance with the commands of the CPU (21), the teletext data receiving IC (c) performs error correction and generates sampling pulses for data acquisition, and this signal is sent to the gate array (23). Program RA via
Sent to M (24). This program RAM (24)
forms a ring buffer and stores it in exchange with new data sent in one after another. Here, when a certain program is selected by a control signal from a remote control (6), which will be described later, the VRAM (
2B). The data in this V RAM (2B) is transferred to the video/video via the teletext composite processing IC (26).
It is sent to the audio switching control section (3), and this video/audio switching control section 1 (3) (D21 hy=+, tl') (15)
The text is sent to the CRTO 6) and the character image is displayed.

(e) To record a character image on a VCR, the data from the teletext processing unit (4) is encoded by the RGB encoder Q21 of the video/audio switching control unit (3) and the data is VCRQT.
).

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

(2) When printing character images, V RAM (28
) data to the teletext composite processing IC (26), gate array (27), and boolean 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 general T
The V broadcast audio signal and the teletext audio signal described in (c) 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 0D 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 θD is first sent to the CRT (16) via the 21-pin connector 05), and secondly sent to the VCR07) to the gourd 3 and the RF signal. It is output from the RF signal output terminal (9) of the modulator (1).

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 one system microcomputer of the video/audio switching control section (3). The system microcomputer side performs the following control.

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

[Yes]) Sends a switching signal to the analog switch 00, and connects 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 channel data in the nonvolatile RAM 04).

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

(e) Instruct the audio multiplex decoder 00) to switch audio main/sub.

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

In the above device, the present invention has a function to prevent the memory expansion card (7) from being accidentally removed or inserted from within the teletext processing section (4). As shown in Figure 1, the memory expansion card (7) is equipped with an expansion ROM (37) and an expansion RAM (34), and has an expansion ROM presence/absence terminal (40) and an expansion ROM (40). It is equipped with a RAM with/with terminals and without terminals 5).

Further, an electronic lock (42) is coupled to the system microcomputer side of the video/audio switching control section (3).

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)
Conventionally, if the memory expansion card (7) is removed from the CPU, the CPU (21) goes out of control and cannot be restored unless the power is removed.However, in the present invention, the video/audio switching control section (3) )'s system microcomputer 0■ controls the electronic lock to prevent the memory expansion card (7) from being removed.

Therefore, runaway is prevented.

(2) A memory expansion card (7) is installed in the teletext processing unit (4).
) is not inserted, F ROM (22)
During normal operation, the memory expansion card (7) is inserted into Sakae.
Assume that the is inserted. In this case as well, the system microcomputer 031 of the video/audio switching control section (3) T: if
Lock the child lock to prevent insertion and prevent malfunction.

〔Effect of the invention〕

As described above, the present invention prevents runaway or malfunction by controlling the electronic lock by the system microcomputer of the video/audio switching control unit to prevent the card from being suddenly inserted or removed. It can be prevented from

[Brief explanation of drawings]

FIG. 1 is a block diagram of the main 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 receiving section, 6- Remote control, 7--Memory expansion card, 8- RF signal input terminal, 9-...RF
Signal output terminal, 10- Audio multiplex decoder, 11-
Analog switch, 12RGB encoder, 13-
System microcomputer, 14, - Non-volatile RAM, 15
-・-21 bin connector, 16-... CRT, 17
-・-VCR, 1B-・-Display unit, 19-・-Waveform equalization circuit, 20- Teletext data reception IC121-
--CPU, 22FROM, 23- Gate array, 24- Program RAM, 25- Nonvolatile RAM,
26- IC127 for teletext composite processing, gate array, 23-V RAM, 29-9 CGROM,
30 Printer I/F, 31-- Audio signal filter and amplifier, 32-- Card connector, 33- Printer, 34- Expansion RAM, 35-- Expansion RAM
With/terminal terminalless 7- Expansion ROM, 40 ・--
Expansion ROM with/without terminal, 42- Electronic lock patent applicant Fujitsu General Co., Ltd.

Claims (1)

[Claims] (1) A memory expansion card is removably attached to the teletext processing unit, wherein the memory expansion card includes a memory expansion RAM and a program expansion ROM, and the video/audio switching control unit has an electronic lock. The system microcomputer is equipped with a system microcomputer that controls this, and this system microcomputer stores the ROM in the teletext processing unit and the RO in the memory expansion card.
1. A teletext receiving device with a removable memory expansion card, characterized in that the switching between the M and M is controlled and the memory expansion card is prevented from being removed by electronic lock control.