JPH0263390A - Telephone receiver - Google Patents

Abstract

PURPOSE:To set the capacity of a ring buffer of a memory according to an object by providing a standard RAM, an extended RAM and a buffer setting circuit using RAMs and setting the capacity of the ring buffer in response to an external signal. CONSTITUTION:Extension RAMs 24a, 34a to increase the capacity of a ring buffer comprising a standard RAM 24 are added and a ring buffer capacity command signal is sent to a ring buffer setting circuit 46 as an external signal. Then an end address is set to as to obtain a set capacity in the ring buffer setting circuit 46 to obtain a ring buffer with an object capacity. In this case, the extension RAMs 24a, 34a are provided to the memory expansion card and made removable to a teletext processing section (main body) 4 to select them as required. Thus, all pages of a teletext program are selected momentarily.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a teletext receiver n in which the capacity of a ring buffer can be set according to the purpose.

"Prior Art" The functions of a memory expansion card in a conventional teletext receiving device were determined in advance by the capacity of the built-in memory (RAM and ROM). 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 device cost. The model was prepared.

``Problems to be solved by the invention'' Providing a wide variety of models as in the past makes it difficult for manufacturers to manage demand and parts, and from the user's perspective, it is difficult to improve functionality. In order to do this, we had to purchase a different model, which was a lot of waste.

In order to solve these problems, the present invention aims to provide a memory ring buffer whose capacity can be set according to the purpose.

"Means for Solving the Problems" The present invention provides standard RAM, additional RAM, and these RAMs.
M, and a ring buffer setting circuit that sets the capacity of the ring buffer according to an external signal.

"Operation" In order to increase the capacity of the ring buffer configured with standard RAM, an additional RAM is added and a ring buffer capacity command signal is sent as an external signal to the ring buffer setting circuit. Then, in the ring buffer setting circuit,
Set the end address so that it has the set capacity to obtain a ring buffer with the target capacity. At this time, the additional RA
M is installed in a memory expansion card and is detachable from the teletext processing unit (main body) so that it can be changed as necessary.

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

First of all, teletext reception will be explained in this article. (1
) is an RF modulator for controlling RF double signal switching, (2) is a tuner circuit for tuning and intermediate frequency increase $i, (3) is a video/audio switching control section, (4) is a teletext processing section, (5) is the remote control receiver, (6) is the 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 (
lO), analog switch (11), RGB encoder (12), system microcomputer (13), non-volatile RAM (
14), an RGB 21-pin connector (15), and other connectors are provided. The video/audio switching control section (3) also includes a CRT (16) connected to a 21-pin connector (15), a VCR (17) for storing and reproducing video tapes, video power sets, etc. stereo, 2
A display section (18) for Japanese and other data is combined.

The teletext processing unit (4) includes a waveform equalization circuit (19), a teletext data reception IC (20), and a CPU (21).
), P (program) ROM (22), gate array (
23), program RAM (24), non-volatile RAM (25)
), Composite processing for teletext processing i C (26), Gate array (27), ■ (Video) RAM (28), C
A G (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 watching general TV broadcasts, connect the analog switch (11) and 21-pin connector (15) to the CRT (
16) and displayed on this CRT (16).

(b) When recording on the VCR (17), the Vc
Recorded at R(17).

(e) When sending an RF multiplied signal to an external device other than the VCR, the RGB encoder (12) to the RF modulator (1)
The signal is then output 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 sent directly to the teletext processing section (4).
The signal is sent to the waveform equalization circuit (19). This waveform equalization circuit (1
9), the CPU (21) commands the waveform shaping such as ghost 1-removal, and then the 1 character broadcasting data reception IC (2).
0) 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, which exchanges and stores new data one after another.

Here, when a certain program is selected by a control signal from the remote control (6), which will be described later, the teletext composite processing IC (
26) and in the V RAM (28) with reference to the CGROM (29). This VRAM (2
The data in 8) is sent to the video/audio switching control unit (3) via the teletext composite processing IC (26), and is sent to the CRT via the 21-bin connector (15) of the video/audio switching control unit (3). (16) and the character image is displayed.

(e) For VCR recording of character images, data from the teletext processing section 4) is sent to the RG of the video/audio switching control section (3).
B 工” / ml-da (12) t'xn code and V
Send to CR(]7).

(f) During RF output of a character image, a signal similarly encoded by the RGB encoder (12) is sent to the RF modulator (1) and output from the RF signal output terminal (9).

(g) When printing character images, V RAM (28
) data to the teletext complex processing IC (26), gate array (27), and 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) R from the antenna via the RF signal input terminal (8)
It is input to the F modulator (1) and then to the tuner circuit (
2) and is sent to the video/audio switching control section (3). This video/audio switching control section (3) has an audio multiplex decoder (
10) to an analog switch (11), where the signal is switched between a general 1゛V broadcast audio signal and a teletext audio signal, which will be explained in (b) below.

(b) 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).
Only the audio signal is sent to the analog switch (11) of the video/audio switching control section (3) via an audio signal filter and amplifier (31).

(c) Either one of the audio signals selected by the analog switch (11) is first sent to the CRT (16) via the 21-pin connector (15), and secondly sent to the VCR (1
7); thirdly, the RF of the RF modulator (1);
Output from the signal output terminal (9).

C6 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 (13) of the video/audio switching control section (3). This system microcomputer (13)
Then, control as follows.

(a) Send a switching signal to the analog switch (11) to switch between a normal TV broadcast audio signal and a teletext audio signal.

(b) Send a switching signal to the analog switch (11) and combine the video signal from the tuner circuit (2) with the teletext processing unit (
4) Switch the teletext synchronization number 44 from 4).

(c) Channel selection control of the tuner circuit (2) is performed based on channel data in the nonvolatile RAM (14).

(d) Selection of a teletext program by instructing the CPU (21) via the gate array (23) of the teletext processing unit (4);
Instructs printing, voice control, etc.

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

(f) Control the display by commanding the display section (18).

In the above-mentioned apparatus, in the present invention, in addition to the standard program RAM (24) in the teletext processing unit (4), an additional R
If there is an A M (24a), use it, or if the memory expansion card (7) is removable, use the internal expansion RAM (34) to change to the desired ring buffer capacity. Has a function. As shown in FIG. 1, a ring buffer setting circuit (46) is used to set the capacity of the ring buffer. This ring buffer setting circuit (46) is the goo 1 to circuit (47) (48)
, a memory read counter (49), a memory write counter (50), a comparison circuit (st) (52), a memory end address latch (53), and a selector (54), and the memory end address latch (53) includes a Ring buffer end address information is input from the input terminal (55).

In such a configuration, ring buffer end address information is input to the input terminal (55). This information is, for example, the expansion RA of the memory expansion card (7) that is installed or removed.
The capacity data of M (34), commands from the remote controller (6), the amount of information to be recorded in the video signal, etc. are used.

This information is sent to the comparison circuits (51) (52) via the memory end address latch (53).

Separately, from the CPU (21) to the gate circuit (47)
(48), the control signals of the read signal and the write signal are counted by a memory read counter (49) and a memory write counter (50), respectively. These count values are compared by the comparison circuits (51) and (52), and a match signal clears the memory read counter (49) and memory write counter (50). The values of the memory read counter (49) and the memory write counter (50) are alternately selected by the selector (54), and one program RAM (24)
input as the address of the CPU (21
) are sequentially written into a ring buffer.

Here, if the standard program RAM (24) alone is insufficient for the set ring buffer capacity, an additional RAM (24a) in the teletext processing section (4) is added. In addition, if this additional RAM (24a) is insufficient, or if the additional RAM (24a) is
4a), an expansion RAM (34) in a memory expansion card (7) is added as shown in FIG. Expansion RA in this memory expansion card (7)
The capacity of M (34) has 256 byte types and 1M byte type. The method for identifying the capacity of the expansion RAM (34) is based on the flowchart shown in FIG. 3, for example. That is, (t) the program starts when the source is turned on or the memory expansion card (7) is inserted into the teletext processing section (4).

(2) Initialize the counter and memory address by setting them to O.

(3) Write a certain value X to a certain address in the expansion RAM (34) after initialization. Here, the expansion RAM (34
) is assumed to have two types in 256: byte and 1M byte. For example, if the expansion RAM (34) has 256 bytes (=16 bytes 16 banks), a certain value be included.

(4) Read the value at the written address. Let the read value be y.

(5) If x and y are different, it means that the byte expansion RAM (34) is not inserted in 256, and N
It becomes o (nothing) and ends.

(6) If Yes, there is at least 256 bytes of RAM, so add + to the counter.
1 is added, +1 is added to the address, and x=y at that address is similarly determined. If X~y, 25
This results in a 6-byte RAM. If x=y, it is determined that the memory size is 256 x 2 bytes or more.

In the same manner, x=y is determined for the third and fourth times.

Based on the fifth judgment, when it comes to X to y, 256 X 4
It is determined that the RAM is 1 Mbyte.

Note that the memory capacity is not limited to 256 bytes and 1 Mbyte.

"Effects of the Invention" Since the present invention is configured as described above, the capacity of the ring buffer can be freely set using the RAM and the additional RAM. Therefore, all pages of a teletext program can be instantly selected.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing an embodiment of the teletext receiving device according to the present invention, Fig. 2 is a block diagram showing a state in which it is combined with a memory expansion card, and Fig. 3 is a block diagram showing an embodiment of the teletext receiving device according to the present invention. flowchart,
FIG. 4 is a block diagram of the teletext receiver. (1)...RF modulator, (2)...tuner circuit, (3)...video/audio switching control section, (4)...
・Teletext processing unit, (5)...Remote control receiving unit, (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)...RG
I3 encoder, (13)...System microcomputer, (
14)...Nonvolatile RAM, (15)...21-bin connector, (16)...CRT, (17)...VCRl
(18)...display section, (19)...waveform equalization circuit, (
20) Teletext data reception IC1 (21)...c
pu, (22)...PROM, (23)...Gate array, (24)...Program RAM, (24a)-Extension RAM, (25)...Nonvolatile RAM, (26)...
・IC1 for composite processing for teletext broadcasting (27)...Goo 1 Hair Ray, (28)・V RAM, (29)・CGRO
M, (30)...Printer I/F, (31)...Audio signal filter and amplifier, (32)...Cart connector, (33)...Printer, (34)...RA for expansion
M, (46)...link buffer setting circuit, (47)
(48)...Goo 1~Circuit, (49)...Memory read counter, (50)...Memory write counter, (5
]) (52)・Comparison circuit, (54)・Selector, (55
)・End address input terminal. Applicant Fujitsu General Ltd. Figure ■

Claims (6)

[Claims] (1) A teletext receiving device comprising a standard RAM, an additional RAM, and a ring buffer setting circuit that uses these RAMs to set the capacity of a ring buffer according to an external signal. (2) The teletext receiving apparatus according to claim 1, wherein the standard RAM and the additional RAM are fixedly provided in the teletext processing section. (3) Standard RAM is installed in the teletext processing unit, and additional RA
2. The teletext receiving apparatus according to claim 1, wherein M is provided in a memory expansion card, and the teletext processing section and the memory expansion card are detachably connected by a connector. (4) The teletext receiver according to claim (1), wherein the external signal to the ring buffer setting circuit is a command from a remote controller. (5) The teletext receiving apparatus according to claim (3), wherein the external signal to the ring buffer setting circuit uses an output that identifies the capacity of the additional RAM of the memory expansion card. (6) The teletext receiving apparatus according to claim (1), wherein the external signal to the ring buffer setting circuit uses the amount of information in the video signal to be recorded.