JPS6149574A - Program transmission method - Google Patents

Abstract

PURPOSE:To serve effectively the user of a personal computer by transmitting the menu program, which indicates titles or contents of plural programs, in serial in bit sequence. CONSTITUTION:In a CATV line center, programs from plural data channels of programs sources 2101-2131 and the serial menu program in bit sequence are transmitted from a transmitter 10 through a multiplexer 22. In the terminal equipment side, the CATV broadcast from a cable 1 is received by a TV receiver 30. A receiver 40 used for reception of service broadcast receives signals supplied to front end 41 and gives signals to a personal computer 63 through a demultiplexer 45 and a selector 61, and left and right audio signals are outputted to speakers 55L and 55R by a decoder 51. The user can input a desired menu in the menu program, which is displayed on the TV receiver 30, from a keyboard of the computer 63.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for transmitting a program for a personal computer.

Conventional Technology As a method of transmitting various digital data using a CATV line, a method of transmitting in a format as shown in Fig. 7 has been considered (for example, Japanese Patent Application No.
210,356%).

That is, this transmission signal St, as shown in FIG.
Although it is a binary signal having many frames, one frame is composed of 256 words W1 to W256, and as shown in the figure, one word is composed of 168 bits and has a period. is 1/44.1kHz
It is. And each word is an 8-bit synchronization code 5
YNC, 4 service bits SB, 32 bits x 4 data bits CIA-CHD, 7 bits x 4
error correction bits ECC.

In this case, the synchronization code 5YNC is set to frame sync FS in word W1 at the beginning of the frame, as shown in A in the same figure.
255 (Fixed words W2 to W256 are word sync WS, and the frame sync FS and word sync WS have different bit patterns.

Also, the service bit SB is for one frame, that is,
This is an address signal for each terminal device in units of 4 x 256 = 1024 bits, and a signal indicating the service content for that terminal device, such as permission to listen to paid audio broadcasting. For example, if 21 bits of one unit (1024 bits) of service bit SB are used for addresses for terminal devices, it is possible to address 221.gamma.2.1 million terminal devices.

Furthermore, data bits CHA-CHD each have 3
It is composed of 2 bits and constitutes four mutually independent channels CHA to CHD. And each of the channels CHA-CHD is C-F in the same figure.
It is possible to take any mode from mode A to mode D, not shown in . Here, in A mode, the stereo left and right channel audio signals, R, are set at a frequency of 4
This is a mode in which the signals are sampled at 4.1 kHz and encoded into 16-bit PCM signals, which is also the same format as compact discs. Therefore,
This A mode can provide an extremely high quality stereo audio signal.

In addition, B mode has two sets of stereo signals LL.

R1 and L2. In this mode, R2 is sampled at a frequency of 44.1kHz and encoded into 8-bit PCM signals. Note that in this B mode, noise reduction by compression/expansion of the audio signals L1 to R2 is also used. Therefore, in this B mode, two channels of western quality stereo broadcasting can be provided.

Furthermore, in C mode, 8 channels of monaural signal M1
-M8 are sampled at a frequency of 22.05 kHz and encoded into 8-bit PCM signals, but some of the signals M1-M8 are used for faxes etc. depending on the purpose.

Therefore, in this C mode, services such as news, weather forecast, emergency broadcast, and fax can be realized.

Furthermore, D mode realizes B mode and C mode in one channel, and can support more detailed services.

And these A-D modes and channels CHA-CH
The combination with D is free.

Furthermore, the error correction code ECC is for correcting errors in each of the 7 bits of the channels CHA to CHD, and is a BCH code.

The transmission signal s't having the above format has a transmission bit rate of 16) 1 bit x 44.1 kHz, which is 7.4 Mb/
s, which can be transmitted using the band 6M112 corresponding to one channel of television broadcasting or CATV.

Problems to be Solved by the Invention When transmitting personal computer programs and data using a general telephone line, the programs and data must be converted to MSK signals in the audio band before being transmitted. Even when transmitting a personal computer program using the above-mentioned formant, it is conceivable to convert the program into an MSK signal in the audio band and then transmit it as the signal M1, for example.

However, if this is done, for example in the D mode, only the signals M1 to M4 can be used, so only four programs can be transmitted.

Moreover, the user cannot know the contents until he/she receives the four programs, loads them onto the computer, and executes them.

This invention makes it possible to transmit a large number of programs when transmitting personal computer programs (and data) using the format described above, and also to enable the receiving side to easily retrieve a desired program. That is.

Means for Solving the Problems In the present invention, a plurality of computer programs and a menu program indicating the title or content of each program are transmitted, for example, in the format shown in FIG.

Since menu programs displaying the titles or contents of these programs are also transmitted at the same time as the original programs, the user can immediately and easily know what kind of program is currently being sent.

Furthermore, it is easy to change the program to be transmitted, and even if there is a change, the user can be notified immediately by changing part of the menu program. Needday also allows you to easily select your desired program from among the many programs available.

Embodiment In the example shown in FIG. 1, ζ is the channel CHA to CHD.
Among them, the channel CHA is set as DT--F, and therefore,
Four monaural signals M1'' and M4 are prepared.

In this case, these four signals M1 to M4 each have 8
Since it is a bit and has a period of 1/22.05kllz, for example, when the first bit [1] of the signal M1 arrives at 1-1
Then, this first bit [1) is ]/22.05
Can be used for each kllz. Similarly, the remaining hits [2) to (8J and the first to eighth hits (1) to 18 of M2 to M4) of signal M1 are each 1/22.05k.
) can be used for each lz.

Therefore, bit [1] of signal M1 is used in order to configure the first data channel DCOI, and in the same manner,
Bits [2] to [8] of signal M1 and pinpoints (1) to (8) of signals M2 to M4 are sequentially used to form second to 32nd data channels DC02 to DC32, respectively.

Thirty-one personal computer programs (or data) are serially transmitted through each of the data channels DCOI to DC31. These 31 programs can be used on general personal computers, such as MS
This is a program that can be executed on an X standard personal computer.

Furthermore, data channel DC32 serially transmits menu programs. This menu program displays the titles and contents of the 31 programs being transmitted by the data channel DCOI-DC31, and when the user specifies one of the 31 programs, the specified program can be personalized. This is a program that is loaded onto your computer and starts automatically.

In addition, in the data channel DCOI, when the program in charge of this data channel DCOI is transmitted to the end, the program is transmitted again from the beginning, and so on, each data channel DCOI to DC3
In step 2, the program handled by that data channel is repeatedly transmitted.

Note that the period of the signals M t to M 4 is 1/22.0
Since the frequency is 5kHz, each data channel DCOI~D
The bit rate of C32 is 22050 bps.

Figure 2 shows an example of a CATV center.
This is a transmission circuit for ATV broadcasting, in which a television signal for each television channel is formed, and the television signal is transmitted to the coaxial cable (11) through a mixing circuit (29).

Furthermore, (20) skips the transmission circuit for performing the above-mentioned service broadcasting, and outputs the data channel DC from the program source (2101) to (2131) such as a computer.
The program transmitted on OI~DC31 is taken out and supplied to the multiplexer (22), and the menu program transmitted on the data channel DC32 is taken out from the program source (2132) and supplied to the multiplexer (22). , this multiplexer (
22), signals M1 to M4 in the format described above are taken out, and these signals M1 to M4 are supplied to the next stage multiplexer (23).

Furthermore, a stereo signal when channel CIA is used in D mode is extracted from the signal source (21^), and an H digital signal is extracted and supplied to the 1ζ multiplexer (23), and the signal sources (21B) to (210) )
From + + 'J ne7L/ CHB = CHD (
7) 7”; The tall signal is taken out and sent to the multiplexer (
23).

Then, the forming circuit (24) generates the smell -ζ, the service pins 1-3B corresponding to each terminal device, the synchronization code 5YNC, the error correction code ECC, etc., and supplies them to the multiplexer (23). The above-mentioned transmission signal St is extracted.

This signal St is then fed to the AM modulation circuit (26) through a binary transversal filter (25) for reducing interference between symbols, and is converted into an intermediate frequency signal (the intermediate frequency is, for example, 38.9 MHz). This signal is supplied to a VSB filter (27) and converted into a VSB signal with an occupied bandwidth of 6Ml1z, which is the same as that of a general television signal, and this signal is supplied to a frequency converter (28) to convert it to a predetermined frequency. This signal is frequency-converted into a TV channel signal, and this signal is sent to the coaxial cable +11 through the mixing circuit (29).

On the other hand, FIG. 3 shows an example of a terminal device.

Further, (30) is a television receiver for receiving energized CATV broadcasting, and a television signal from cable (1) is supplied to this television receiver to receive energized CATV broadcasting.

Further, (40) indicates a receiver for receiving the above-mentioned service broadcasting, the signal from cable +11 is supplied to the front end (41), the VSB signal by signal St is taken out, and it is converted into an intermediate frequency signal. This signal is sent to the demodulation circuit (43) through the intermediate frequency amplifier (42).
), the signal St is demodulated, and this signal St is sent to a demultiplexer (45) through a waveform shaping circuit (44).
to the desired channel, e.g. channel CH
A signal is taken out. And out of this signal, signal.

The R digital signal is supplied to the decoder (51), where error correction and correction are performed, and then to the D/A converter (51).
2L) and (52R) to become the original audio signal, and this signal is sent to the noise reduction circuit (53L).
), (53R) and amplifier (54L),
(54R) through speaker (55L),
(55R).

Also, from the demultiplexer (45) the channel CHA
Signals M1 to M4 among the signals are supplied to a selector (61), and a signal of a predetermined data channel is extracted.
This signal is supplied to the personal computer (63) through the interface (62). Note that the video output of this computer (63) is, for example, a television receiver (3).
0), and this receiver (30) is connected to a computer (
63) is used as its CRT display.

FIG. 4 shows an example of an interface (62). In this example, the computer (63) is an MSX standard personal computer, so the interface (63) is
2) is a cartridge type computer (63
) is connected to the expansion cartridge slot.

The memory map of the MSX standard personal computer is shown in Figure 6, and the installed RA
When M is 32 bytes, its starting address is 800.
It is set to address 0H, and when it is hidden at 16, its start address is set to address COOOH.

Additionally, in MSX computers, ROM cartridges and RAM cartridges can be used as expansion cartridges. When the power is turned on, the existence and type of expansion cartridges are checked, and if a ROM cartridge is set, data is written to the ROM. The program is configured to run.

Then, in the interface (62), (621
11) is a data bus, (621^) is an address bus, (
621C) indicates a control bus, and these buses (621C) indicate control buses.
210) to (621C) are connected to the connector (622), and this connector (622) is connected to the MSX computer (621C).
3) is connected to the expansion cartridge slot (631).

Further, (623) represents a ROM, (624) represents a RAM, and the routine (70) of the flowchart shown in FIG. 5 is written in the ROM (623). In addition, RAM (
624) is used to load the program transmitted from the CATV center in cooperation with the RAM of the computer (63), and these memories <623>,
The data terminal DB and address terminal AB of (624>) are connected to buses (621D) and (6218), respectively.

However, in this case, ROM (623) and RAM (624)
) are the same memory address, and both start addresses are address 8000H. Therefore, the memory control circuit (625) is connected to the buses (6210) to (621G) and addressed to the I10 address, and its output is supplied to the chip select terminal C8 of the ROM (623) and RAM (624), and the ROM (623) and RA
Bank switching (chip selection) is performed with M (624). In addition, when the power is turned on and reset, the ROM
(623) is selected.

Furthermore, a read line signal is also taken out from the control circuit (625), and this signal is supplied to the output enable terminal OB of the ROM' (623) and the read/write terminal R/H of the RAM (624).

Also, (627) indicates the input circuit, and the dirt is R3-23.
The configuration is similar to the 2C receiving circuit. This input circuit (627) is connected to the buses (6210) to (621G) and is addressed to the I10 address, and is also connected between the selector (61) and the data bus (6210) and is connected to the selector (61). converts the output signal from a serial signal into a parallel signal and supplies it to the data bus (6210).

Furthermore, (62B,) opens a 5-bit latch, its input terminal is connected to the data bus (6210), and its output Q is connected to the selector (61), and the data channel DCO
It is supplied as a control signal to determine which data channel signal among the signals of the I-DC 32 is to be used as the output signal of the selector (61). In addition, (629) indicates an address decoder, which is connected to buses (6210) to (621G) and forms a latch signal at the I10 address of the latch (62B) and supplies it to the launch (628). .

When the MSX computer (63) is turned on or a cent is applied, the control circuit (625) selects the ROM (623) and the computer (625) selects the ROM (623).
63), the interface (62) is a ROM cartridge, so the routine (7) of the ROM (623)
0) starts from step (71). Then, in this step (71), a step (73) to be described later is performed.
) to (75) are transferred from the ROM (623) to the RAM of the computer (63) starting at address COOOH, and then the process moves to step (72), which brings the process to C00O)1. Move to the address.

After this COOOH address, steps (73) to (75) have been transferred by step (71), so step (73) is executed, and this step (73)
), the bank switching data is supplied to the control circuit (625), which changes the output of the control circuit (625), and thereafter prohibits the ROM (623) and RA
M (624) is selected.

Processing then proceeds to step (74), where step (
74) The area from address ζ80008 to address BI'FFH is RAM (624), that is, this is equivalent to the implementation state of 32-byte RAM, so this 32' is the byte RAM and M area. Processing to indicate this (such as setting the start address of the RAM area) is performed.

Next, the process proceeds to step (75), which step (
75), the latch (6
28) is addressed and the control signal of the selector (61) is latched to the launch (62B), and at the same time, the control signal is supplied to the selector (61) and the data channel D
C32 is selected, and therefore, the signal of data channel DC32, that is, the menu program signal, is taken out from the selector (61).

The signal of this menu program is input to the input circuit (6
27), and is sequentially loaded into the 5AM area starting from address 8000H, which is expanded in step (74).

When loading of the menu program is completed, the process proceeds to step (76), and in this step (76), the process shifts to the menu program loaded in step (75), and that menu program is executed. Then, based on the processing of this menu program, the title or content of the program transmitted by the data channels DCOI to DC31 is displayed on the receiver (30), and in the next step (77) it is determined which program is desired. The system waits for the specified input.

Then, when the user inputs the desired program from the keyboard of the computer (63), the process moves to step (78), and in this step (78), the chip (75) loaded in step (71), A routine to low F the data channel signal is executed, and at this time, the control signal corresponding to the program specified in step (77) is launched (628).
) is supplied to the selector (61) through step (7
The data channel of the program specified in step 7) is selected, and thereafter, in step (79), the program is loaded into the RAM area starting from address 800.

Then, when the loading of the manually-loaded program in step (77) is completed, the process proceeds to step (80), where the process shifts to the program loaded in step (78). Therefore, if the program specified in step (77) is executed and the program is a game program, the computer (6
3) and the image reception fi (30) can be used to play the game.

According to the present invention, it is possible to transmit a large number of program programs as described in (A) above, but in this case, in particular, according to the present invention, the titles or contents of those programs can be transmitted at the same time as the original programs used by the user. Since the menu program that displays the message is also transmitted, the user can easily and directly know what kind of program is currently being sent.

Furthermore, it is easy to change the program to be transmitted, and even if there is a change, the user can be notified immediately by changing part of the menu program. Furthermore, the user can easily select a desired program from among many programs.

Note that in the above, data indicating a menu may be transmitted instead of the menu program, and a program for displaying the data is prepared in the ROM (623).
It may also be transferred to the RAM and executed in step (71). Further, the program executed by the user may also be data used by the user, that is, data similar to videotex, teletext, etc. That is, data may be transmitted as a file instead of a program.

Furthermore, in the above, when the execution of step (80) is completed after step (80), step (
By executing the process that erases the loaded program in step 79), the program can be protected and prevented from being saved on a cassette tape or the like. Further, when the computer (63) is a dedicated machine, steps (75) and subsequent steps may be executed.

Effects of the Invention Since a menu program displaying the titles or contents of those programs is transmitted simultaneously with the original programs, the user can immediately and easily know what kind of programs are currently being sent.

Furthermore, it is easy to change the program to be transmitted, and even if there is a change, the user can be notified immediately by changing part of the menu program. Furthermore, the user can easily select a desired program from among many programs.

[Brief explanation of the drawing]

FIG. 1 is a bitmap diagram of an example of the present invention, and FIGS. 2 to 7 are diagrams for explaining the same. (218) ~ (210) , (2101) ~ (2
132) is a source, (22) and (23) are multiplexers, (26) is a modulation circuit, and (28) is a frequency converter. Figure 5 Figure 6

Claims (1)

[Claims] A program transmission method in which a plurality of programs to be executed by a user on a personal computer and a menu program indicating the title or content of each of the plurality of programs are serially transmitted in bit order.