JPH0531340B2 - - Google Patents

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention is a receiving device equipped with a plurality of independent program ROMs, such as for teletext broadcasting, captain use, and personal computer use, as a fixed part that does not require modification. The variable part, which can be changed as needed, is separated from the circuit to create a chip, and multiple program ROMs are switched and controlled by the CPU in the data processing part of the fixed part. .

``Prior Art'' The present applicant has already proposed a receiving device as shown in FIG. 2 as a receiving device capable of receiving both teletext and caption (for example, Japanese Patent Application No. 61-302947). This consists of a teletext dedicated circuit 1, a captain dedicated circuit 2, and a common circuit for teletext and captain 3.
It is broadly divided into

A synchronizing signal generating circuit 6 and a data clock generating circuit 7 are connected to the television video signal input terminal 4 of the teletext dedicated circuit 1 via a waveform equalizing circuit 5, and this data clock generating circuit 7 is connected to an interface. An error correction circuit 9, a packet buffer 10, and a bus buffer 11 are connected via a line 8.

A telephone line input terminal 12 and a telephone output terminal 13 of the captain-dedicated circuit 2 are connected to a telephone line switching control and modem circuit 14, and further connected to an interface 15, a captain upstream signal oscillator 16, and a captain-dedicated program ROM 17. There is.

The common circuit 3 is provided with a CPU 18 for image processing, and this CPU 18 is connected via a bus line 19 to a program ROM 20 dedicated to teletext broadcasting, a bank switching refresh control circuit 21, and a RAM 22 for storing program data for shared use with teletext broadcasting and the captain.
CGROM23, printer interface 24,
A microprocessor 25 for melody processing and program ROM switching commands, a CRTC 26, a bus buffer 11 of the teletext dedicated circuit 1, and, if necessary, a buffer 27 or directly coupled to the program ROM 17 of the capsule dedicated circuit 2. ing.

An interrupt circuit 28 is also coupled to the CPU 18, a printer 29 as an external device is coupled to the printer interface 24, and a remote control 31 as an external device is coupled to the microprocessor 25 via a light receiving section 30. ing. This microprocessor 25 also has a buffer and data.
RAM 34, refresh control circuit 35 and FM sound source circuit 32 are combined, and this FM sound source circuit 32 is
It is coupled to a TV interface 36 via a DAC 33. The CRTC26 has V-RAM3.
7 is coupled, and the TV interface 36 and RGB encoder 38 are coupled, and this TV interface 36 and RGB encoder 3
8 is coupled to TV connection terminals 39 and 40.

``Problems to be solved by the invention'' When converting the above circuit into an IC chip,
Simply put together several circuits to create one or several circuits.
If you just put everything together in an IC, you won't be able to change the model, increase functionality, or combine it with other devices, or it will be extremely troublesome. In particular, when a plurality of program ROMs are provided, switching control of these ROMs is troublesome, and the number of control ICs increases, making the circuit complex.

``Means for Solving the Problems'' Therefore, in the present invention, it is desirable to change or convert the entire circuit from fixed parts that do not change unless the principles and principles change. In addition to dividing the variable parts into chips,
The fixed part stores multiple program ROMs in one
This is a program that can be switched by the CPU, and specifically includes memory for character generation and multiple programs for each type of input signal that store independently configured programs for processing and controlling input signals.
The CPU switches and controls the ROM and these program ROMs, and processes and processes audio and images during playback.
a data processing circuit for controlling, a plurality of input circuits for each type of input signal for converting the input signal into character data, reading and primarily storing the input signal, and a data processing circuit for controlling the program ROM from an external circuit; The system control CPU, which controls the entire system including switching, and the memory, which stores data signals from the input circuit, are configured as variable parts.

``Operation'' The circuit is divided into two parts: the fixed part is the circuit that does not require changes in principle, and the variable part is the circuit that can be changed depending on the model. At this time, the program ROM for each input circuit can be switched and controlled by the CPU of the data processing circuit, making it possible to generalize the circuit configuration of the fixed part, and changing the simplified variable part to It can be changed depending on the price etc.

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

In FIG. 1, 50 is a fixed part and 51 is a variable part. The fixed part 50 performs audio processing, video processing, program commands, etc. when reproducing the input signal, and is used to connect speakers and CRTs.
a data processing circuit 54 that temporarily stores data when sending it to a memory 5 that generates characters;
5. It is composed of a teletext program ROM 60, a captain program ROM 61, and a personal computer program ROM 62.

The variable part 51 receives command signals from an external circuit 56 such as a remote control or a keyboard, and controls the entire system thereby.
7. It is composed of a teletext input circuit 52, a captain input circuit 53, and a memory 58 for storing data taken in by a personal computer (not shown) or the like.

If Figure 1 and Figure 2 correspond, system control
CPU57 corresponds to microprocessor 25,
Memory 58 is bank switching refresh control circuit 2
1 corresponds to the RAM 22 for storing program data. Further, the teletext input circuit 52 corresponds to the teletext dedicated circuit 1, and the captain input circuit 53 corresponds to the teletext dedicated circuit 1.
corresponds to the circuit obtained by removing the captain-dedicated program ROM 17 from the captain-dedicated circuit 2, and the CG
The data processing circuit 54 corresponds to the CG-ROM 23, and the data processing circuit 54 consists of the common circuit 3 excluding the teletext-only program ROM 20, the light receiving section 30, the microprocessor 25, the bank switching refresh control circuit 21, and the program data storage RAM 22. The teletext program ROM 60 corresponds to the teletext dedicated program ROM 20, and the captain program ROM 61 corresponds to the captain dedicated program ROM 17. Note that the light receiving section 30 and the remote control 31 in FIG. 2 constitute the external circuit 56 in FIG. 1.

In the above embodiment, the circuit is described as being capable of receiving all of teletext broadcasting, a captain, and a personal computer, but it is also possible to use only one or two of them. In addition, these program ROM60,6
1 and 62 may be connected to the switching control CPU 59 in advance, but it is also possible to connect only the target program ROM using a ROM cartridge.

The operation of the circuit configuration as described above will be explained. All program ROM60, 61, 62
is connected, when the power is turned off,
When the captain mode is selected using the remote controller of the external circuit 56, the signal is inputted to the system control CPU 57 through the light receiving section to turn on the power, and the program ROM of the CPU 59 in the data processing circuit 54 is input.
The CPU 59 performs ROM switching control so that the captain program ROM 61 is selected. Note that when the captain mode is selected from a state where the mode has already been switched to the teletext mode, the same processing is performed except that the power-on processing is not necessary.

In the captain mode, the telephone line input terminal passes through the modem, interface, and buffer in the captain input circuit 53, and then is connected to the CPU 57.
It is connected to the data processing circuit 54 via. Once connected, the user operates the remote control or keyboard to request a program. The requested program data (downlink signal) is sent to the data processing circuit 54.
interface according to the instructions of the CPU 59 in the
Memory 58 for storing program data via the bus line
are memorized sequentially. After the necessary data is stored in the program data storage memory 58, even if you turn off the telephone line input terminal using the remote control,
The data will not be lost unless the power is turned off. Therefore, the data can be played back on a TV and printed on a printer if necessary.

Next, when the teletext mode is selected with the remote control, the teletext input circuit 52 is activated and the teletext program ROM 60 is selected by the CPU 59 in the data processing circuit 54. Then, the teletext signal is extracted from the television video signal, and the program data is then stored in the memory 58 in substantially the same manner as the host, and the data is played back on the CRT. The same applies when selecting a personal computer.

"Effects of the Invention" Since the present invention is configured as described above, the variable parts can be replaced depending on the model, purpose of use, etc., and since the variable parts are the minimum necessary, it is easy to make the device more versatile. . Also, multiple program ROMs
Switching is controlled by the CPU in the data processing circuit, which simplifies the control system and circuit configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a receiving device according to the present invention, and FIG. 2 is a block diagram of a receiving device proposed earlier by the present applicant. 50... fixed part, 51... variable part, 52... teletext input circuit, 53... captain input circuit, 54...
Data processing circuit, 55...CG memory, 56...
...External circuit, 57...System control CPU, 58
...Memory, 59...CPU, 60...Teletext program ROM, 61...Captain program ROM, 62...PC program
ROM.

Claims (1)

[Claims] 1. A character generation memory and a plurality of programs for each type of input signal storing independently configured programs for processing and controlling input signals.
The CPU switches and controls the ROM and these program ROMs, and processes and processes audio and images during playback.
A data processing circuit for controlling the data processing circuit is configured as a fixed part, a plurality of input circuits for each type of input signal that converts the input signal into character data and reads it and stores it primarily, and a data processing circuit for controlling the program ROM from an external circuit. System control that controls the entire system including switching
A receiving device comprising a CPU and a memory for storing data signals from the input circuit as variable parts. 2. The receiving device according to claim 1, wherein the plurality of program ROMs are switchably coupled to the CPU of the data processing circuit in advance. 3 Multiple program ROMs are used for data processing circuits.
2. A receiving device according to claim 1, which is coupled to a CPU using a cartridge. 4. The receiving circuit according to claim 1, wherein the input circuit comprises a circuit for extracting teletext from a television video signal. 5. The receiving device according to claim 1, wherein the input circuit comprises a modulation/demodulation circuit that receives a down signal from a telephone line and transmits an up signal to the telephone line.