JPS60171880A - Charged television terminal device - Google Patents

Abstract

PURPOSE:To attain a charged TV system even in unidirectional transmission system by receiving charging information in response to the time viewing a TV program and the content of the program, storing it at each prescribed time and reading and displaying it as required. CONSTITUTION:A TV signal transmitted from a DBS center 11 is received by a receiver 16 via a broadcast satellite 13. An intermediate frequency demodulation unit 19 converts an input signal into a signal of base band. When a charged program is received, a data processing circuit 20 writes a charge in response to a viewing time according to the charge data superimposed in the blanking period of the video signal and displays as required on a CRT17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a billing method that can be used in a unidirectional 94N system VC such as satellite broadcasting.

The configuration of the conventional example and its problems In order to operate the terminal receiver in the same way as when receiving G A IV paid belt in satellite broadcasting t1 @ one-way Shinkokomi Party Sinutem, it is necessary to It is necessary to make the viewer pay the fee in a deferred manner, and if the viewer does not pay, it is necessary to make the viewer's terminal unable to receive reception.

These are implemented in pay television with interactive 0m1°V system.

However, in the case of the Alpha TV system, the viewing of pay TV was performed on the transmitting side via uplink or telephone, so this system was used as a one-way system such as satellite broadcasting (VC).
cannot be used.

In addition, when a large number of Karo users applied to the sending side all at once, the capacity of the telephone line was exceeded, and the processing capacity of the receiving side of the sending side was exceeded.

An example of such a conventional lecture is shown in FIG.

In the figure, 1 is the center computer of the CM TV station, which manages the subscriber's audiovisual payment status, the specification of broadcast programs according to the subscriber's wishes, the creation of control codes, etc.
When '=2, the control code is added to the video signal of a VTR, film, studio, etc. and sent out. 3m is at the head end of Ya.

For example, multiple video signals of OA and TV center 2 are V.
It is sent out in line with the HF midband. 3B is a buffer circuit that receives the upper Vg from each scrap book.

The tuner converter 4 and buffer circuit 3B on the end side of the head end 3 and CM TV are connected by the same cable or by separate cables. Also, tuner/converter 4
A telephone line may be used instead of the cable from the buffer circuit 3B to the buffer circuit 3B.

4 is twice the midband g'ft: tuner on the end side that converts to 1 channel (or 2 channels) of VHF/
It is a converter, and according to the instructions from the keypad 5, one channel in the mid-band CAT Vi) V
Convert to 1 channel of VHF. If the ATV signal is scrambled, it may be converted to a baseband signal, subjected to tenu crampling, and then converted to an RF multiplied signal again to be output as a VHF 1-channel signal.

This is a television receiver that receives 61dJ standard V'llF band.

The viewer operates the keypad 6, turns on the telephone 7, and inputs the desired program (charged) into the center computer 1. At the center 1, charges are set for each terminal, and if scrambled, the decoding key code is sent to the center computer 1 → C), TV center 2 → head end 3 → converter/tuner 4. Use this key code in the tuner/converter 4 to descramble and play back the NTSC video signal with a normal image.
B9 Supply to image 6. Tuner/Converter 4~
There are many chargers 7, and a telephone office is provided between the telephone booklet and the telephone interface 8. The telephone interface 8 is generally operated by a human being who listens to the requests from each end user and converts them into a human form at the center computer 1. This is an example.

OBJECTS OF THE INVENTION An object of the present invention is to provide a billing method that allows live broadcasting of a pay television system in a unidirectional signal transmission system such as a satellite broadcasting system.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, a unidirectional television signal receiving device receives billing information corresponding to the time of viewing a television program and the content of the program at regular intervals in the form of a digital V signal. The amount is determined and stored in a billing amount determination circuit in the copying unit, and charge data proportional to the amount is read out and displayed as necessary. In that case,
A nonvolatile ordering memory for storing fee information and a fully volatile memory for storing an encrypted video signal and a key code signal for decoding Ondo Hakata are separately provided. The key code signal memory includes a first memory that stores the currently valid key code and a second memory that stores the mode code signal that will be valid in the future. The incoming key code signal is written into non-volatile memory only once. Furthermore, a non-volatile memory is provided for storing the contents of the charge information memory, and a flag indicating the month and day when tL has passed, and the type of charge information at 7, according to the charge information for each end copy sent from the sending side; A third memory is provided that stores information that the contents of the second memory have been transferred to the first memory in response to a key code signal switching signal from the sending side.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.An embodiment of the present invention is shown in FIG. 11 in the figure is a satellite broadcast transmission center, which is called a DBS center. 12 is a large parabolic antenna that sends signals to a geostationary satellite 13. 13 is a geostationary satellite that relays signals sent from the ground.

It is a broadcasting satellite that retransmits to the ground. 14 is a receiving antenna installed on the ground. 15 is a low noise condoder, for example, 12G received by antenna 14)
The Iz band signal 11G) is converted to the Iz band signal and transmitted to the receiver 16.

19 in the receiver 16 is an intermediate frequency demodulation unit (IDU).
), and the example is 11;
It is converted to a second IF of Hz, amplified, detected, and outputs a baseband signal. 20 removes the digital signal g that is being output j15! This is a data processing circuit that processes and supplies the data to the decrambler 21.

Assume that the video signal is scrambled using a method of synchronizing shift and randomly inverting the video components, and the f7'H is scrambled using a method of randomly changing the bit arrangement using the digitizer/I/audio. When the output of the IDU 19 is projected on the CRT of the seven-hour color television receiver 17, the brightness of the screen is inverted and horizontal.

Since vertical synchronization cannot be achieved, the content flows and the content is unclear. Also, if you listen to the voice as it is from the speaker, it becomes noise. Therefore, the descrambler 21 switches between inverting and non-inverting the video based on the output of the data processing circuit 20, and also rearranges each bit of the audio digital signal to restore normal video and audio. lamp/
I/).

The system/V reproducing circuit 22 changes the DC level only during the horizontal retrace period during the output of the IDU 19, that is, the portion from t to t2 in FIG.
10) and the t2 to t11 portion of the 1-original video signal (
3) and converts the digital audio signal output from the descrambler 21 into an analog signal.

The output of this person/V regeneration circuit 22 is converted to vH by the RF modulator 23.
If the signal is converted to an appropriate F-band channel signal and the output is supplied to the antenna input of the continuous shooting color television receiver 17, scrambled video and audio can be viewed in a normal state with descrambled images. It is possible to convert such scrambled video and audio into normal N.
There is often a charge to view images and sounds again. If a fee is charged, the vertical retrace period (
Control digital) superimposed on VBL)
The fee is recorded in the memory of the receiver.

Generally, if you receive a certain program for more than 2 to 10 minutes, you often have to pay for the entire program.

To pay the fee, for example, a card reader is added to the data processing circuit 20 in Fig. 2, and the card (such as a few volumes of u) that was purchased with the price is inserted into it. There is a method in which a descrambling control signal is sent from the data processing circuit 20 to the descrambler 21 only for a certain amount of time. Or bank 1 in advance
8, and send the prepaid fee as data to D.
A code representing the paid fee is sent from the BS center 11 to each terminal (individually addressed) via the geostationary satellite 13, and the fee code is written in the memory inside the terminal.
There is also a method in which the charge code in the memory is completely changed (decreased) every time the charge cord is viewed on the terminal, and when it reaches "0", the money is paid to the bank 18 again and the above procedure is repeated.

Now, here, the contents of the data processing circuit 20 in FIG. 2 are configured as shown in 31 to 6o in FIG. 4, and when a pay program is received, the charge data superimposed on the VBL period of the video signal is The fee corresponding to the viewing time is written in the non-volatile memory, the viewing fee is paid to the bank every month, and the paid fee is sent to each terminal (for each valley atlus) by polling from the DBS center 11, and the contents of the memory 47 are sent. Unless the content of the memory 47 becomes "0", the paid programs will not be available from the next month.

In Figure 4, 31 is IDU19 (7) output +7) VB
This is a binarization circuit for shaping the waveform of the binary data signal superimposed between LJF and creating a pulse waveform as shown in the left end portion of FIG. 5B. 32 is an inscription of the clock, which includes the 2-byte “1” at the beginning of Figure 6B, [oJ
Clock run signal of double signal repetition (i R(Cl0Ok
, Run) to regenerate the clock synchronized with Yare and receive it! - Detect the framing code at the 8th bit of the 1st framing code FG of WB A, establish frame synchronization, and synchronize the sampling clock generated by the sampling clock generation circuit 33 with the received signal B. 33 is a circuit that generates all sample link clocks with excessive phase controlled in this manner, and its output is divided by a main clock generation circuit 34 to generate work RAh37.
Work RO plant 38. Center Processing Uni, 1-(
It forms the main clock that drives the CPU) 39, etc.

Sample "The clock synchronized with each bit of the received signal in FIG. 5B from the output of the link clock generation circuit 33 is sampled."
The signal is supplied to a link circuit 35, and each sample of the received signal B is linked. If the width of each puff of the received signal B is KB, it will be about 175 nS, and it is difficult to operate the work RAM 37 to GPU 39 in FIG. 4 in this period.

Furthermore, when an 8-bit microprocessor is used as the UPU 39, it is more convenient to handle the received data as 8-bit parallel signals. Therefore, as the sampling circuit 36, a serial manual-parallel output type shift register such as 5N74LS164 is suitable. The latch circuit 3 is set for each bit using the 8th bit of the frame code as a reference.
6, its output (1-11, 8 bits are output in parallel. This cycle is passed through the operation of each circuit. Its output is connected to the pass line 4o.

37 is the work RAM of C1PU39, 3B is cpU3
CPU 39 is an 8-bit microprocessor (for example, M86809K).

Well, i51! To explain the control code C8゜C1hC7 in the Zl received signal B, co and 01 are "1"
.

It is the clock run signal OR of the repetition of rOJ, and C2
is a framing code signal of "N 1100101". U3 consists of 4 bits of information, 3 bits of Hamming check code, and 1 bit of parity.

The data after C4 also has the same structure for each byte. All oral responses from the information department of C5 and 04 are recorded in Table 1. Here, only three types necessary for explanation are described. In reality, several types or more are possible.

Similarly, Table 2 shows the oral response of the 4-bit information section of C5.

Table 1: In the case of satellite broadcasting, the 8 bits of a, , and C4 are rol.
oooooooJ 'x used, C5 is r 10000Jr
Either 0100J or N100J is used.

FIG. 6C shows a case where 28 bytes of data in a received signal such as that shown in FIG. 5 is program data. A number indicating the type of program is expressed as a 4-byte, 4VT BCD code as a tough code. Therefore, 9999 types can be specified.

The next keyword is a key code that changes every month. This key code is required to descramble the received signal on the terminal side. For terminals that do not pay fees, this key code is sent from the DBS center. Prevent reception by not sending. For example, assume that the fee payment deadline is the 2oth of every month, and the key code is changed from the 1st of every month. Since the receiver 16 in FIG. 2 is always energized, it continues to operate unless the power cord is disconnected.

The next charge code is 4 bytes and contains 4 digits of BCD information. The charge code changes with time, and a charge proportional to the time the program was viewed (the time it was displayed on the CRT'l-) is recorded. This content will be described in more detail later.

The next PN key represents the initial value of the PN code for descrambling the scrambled signal in 4 bytes (16 bits as information).

The first safety measure is to prevent eavesdropping using a PH key.

For the next month and day, the month is represented by two SCD digits and the first day is represented by two BCD digits, so the 5 digits of BOD, that is, 4 bits of information in 4 bytes x 4 are used. Regarding the time, change the time to 2
Digit BCD, minutes are expressed in two-digit BCD. The contents of the program data packet (C5 is "1") are as described above.

Next, when Cs Cal 2 J (r 0010 J) indicates that sulfurized data is being sent, 28 bytes (of which 14 bytes are information data) as shown in C'. All of the data is data, and 14 bytes of information are written to a predetermined location in the work RAM. This data has different contents for each program. There are various possible contents and uses for the scrambled data, but they will be omitted here.

Next, C5 is r3. ．． 1, (roll J), the address data is sent in 28 byte keratos like in C#. This address data (as shown in FIG. 5C') contains addresses indicating two terminals within 1/kugutsu+-.

This C# is shown enlarged in FIG. If the first half of the 14 byes I- is enlarged, it will look like the sixth diagram.

The information bits in the first half of T bytes of D are 28 bits out of 7 bytes and can distinguish 228 terminal addresses, that is, about 2.68 billion terminal addresses.

The latter 8 bytes are divided as shown in Figure 6E. E contains only information bits, that is, 32 of the 8 bytes. 2) Write (1 byte if only information) at the front end of E is used to input up to 256 instructions from the DBS center to each terminal, for example, as shown in Figure 6.
1" indicates the total amount of pay TV that the terminal has watched so far. If the amount is in 26 cent increments, 21
Values up to $0 can be specified using the 12 bits at the right end of FIG. 6 (1.6 bytes of information in 3 bytes of data).

Therefore, when clearing charges, send a code for the amount (up to 1,024 dollars and 6 cents) to each terminal, send the amount paid by the terminal to the bank from the DBS center 11 to each terminal, and The contents of memory 47 are changed. If the amount of money for viewing is written in the amount memory 47 in 25-cent increments, and the amount sent from the DBS center 11 is read from the content, and the content of the amount memory 47 becomes zero. The CPU 39 detects this and reads the key code shown in FIG. If the amount in the amount memory 47 does not reach zero, that is, if the amount to be paid is not yet calculated, the key code will not be imported, so you will not be able to decode and listen to the scrambled information (images, audio) from the next month onward. become unable.

The amount is written (i.e., subtracted) to the memory 4 once a month, and the DBS center 11 writes it once every month at the end of the month and beginning of February.
If you send the price data continuously for about a week,
Even if you accidentally turn off the power to the receiver, if you connect the power for even one day during those two weeks, the payment amount will be written to the amount memory 47 and the contents will become zero, making it possible to read the key code. can. The key code, month, date (time), etc. to be written into the amount memory 47 are written into a non-volatile memory 63 similar to the amount memory 47 in FIG. The memory 53 stores the month and day (date and time) of data writing to the amount memory 47, and even if the payment is mistakenly paid in two or more installments, the amount is stored correctly for the first, second, etc. It is used to manage data to be written to 47.

Next, let's talk about key codes. The key code is composed of 12 bits and indicates a generating polynomial forming the PN sequence of 212-1. For example, rollooooolooolJ
If the key code is sent, the generator polynomial is x”+x
'+x2+x = f ke).

It may be a polynomial of 11 bits or more instead of 12 bits. Alternatively, the key code may be 16 bits and the message in FIG. 6E may be reduced from 1 byte to 4 bits.

Next, the actual operation will be explained. When the terminal book device is purchased, the contents of the buffer circuit 48 in FIG. 4 are all zero, so when the terminal book (assumed as X) is supplied with power, it first captures the key code. When I purchased the device,
The P of the moon is that.

Since the 13BS center 11 does not regularly poll all terminals, it temporarily polls the number of terminals (for example, 1 J) installed on or around that day.

As is clear from Fig. 6, two ends can be polled in 1kl (horizontal period), so if 5H during the VBL period is allocated for polling, 10 terminals / 7 e#d = eo
o7 seconds = 36,000/min, and all 24 newly added endpoints are ringed within one minute. Therefore, a newly installed copy can usually capture the current month's key code within one minute. If installed at the end of the month, the next month's key code will be periodically sent to all subscribers, but the 5H of the vBL period will be sent to all subscribers periodically.
If only half of the 1H is used for polling the current month's key code for new subscribers, as is clear from the previous explanation ((360
00/10) Assuming that the total number of subscribers at this point is 10 million, it will take about 61 minutes to poll all the subscribers.Now, in this sample, 28 unique addresses have been given. This 28 pi l-U
VL to prevent eavesdropping? 266 people's memory is dotted with stones, 28 according to the 5th evil C's kief = 1
It is written as part of the work uOM 38 or in an independent chip so that the correct address can be obtained by performing arithmetic operations on the bit address code. If keyword 1
', it is necessary to receive the sixth worst packet C.

Considering data transmission efficiency, 5H is transmitted at a rate of once per second.
Assuming that the same Hackett is superimposed on all of them and sent out,
On the receiving side, the key code is received within 1 second and the work RA
Write to M37. This keyword has 16 bits of information.

The second security (prevention of eavesdropping) is achieved by performing calculations on data after the keyword and other data using the keyword to decode the gambling data iy.

After receiving the keyword, it receives a bucket of the form 6th C'' and searches for the 28-bit address of terminal x.The sent 28-bit address data and the aforementioned work ROM
When 28 bits of address in 38 match, Fig. 6E
8 bytes are taken into the working RAM 37. Since the content of the amount memory 47 of terminal X is zero, the MSB of the message X in FIG.
Look at the bit of place. Work RO program like this
Put it in L38. The following explanation also assumes that the CPU 39 follows the program in the work ROM 3B.

In the half of the month, the MOB is "1", so the key code is 1 (assuming that the other bits are light on the code side and can be ignored).
The two bits are transferred to the work HAM 37 four times, sent to the nonvolatile memory 53 via the vane line 4o, and stored there. From then on, use this key code to enter the 6th C, c'
, decode the data of c'.

If the received program is a paid program, the charge code □ indicates the charge per unit time. Ideally, for paid programs, the fee should be charged directly in proportion to the viewing time. As one method, it is assumed here that a 60-minute program costs $6, and charges are charged at 26 cents for every 2.6 minutes.

Therefore, as a charge code, the contents of the code are changed every 2.6 minutes, and each time the code changes, the contents of the charge memory in the work RAM 3 are added by 1 bit (equivalent to 25 cents). The memory 41 in the amount memory 47 supplies fee information data from the work RA) I 37, increments the fee data in the work RAM 37 by the number of bits corresponding to the viewing time, and increments the fee data in the work RAM 37 by the number of bits corresponding to the viewing time. ” or using a backup code), when the receiving channel is switched, or when the power is turned off, the battery supports the parts 37 to 47 for a short time, and the output of memory 41 (this is 26 cents). ) is supplied to the addition/subtraction register 46, added to the contents of the memory 4, and the result is written to the memory 43 again.

The nonvolatile memory block of amount memory 47 consists of three memories 41, 43, and 44 of 12 bits each. The output of the flag register 46 instructs addition "Ol all 1
If it is J, the addition register 45 performs addition. Work RA by supporting 37 to 470 circuits for a short time with battery
) Write the fee information of σ37 to the memory 41,
The contents of the memory 43 are added to the contents of the memory 43, and the result is written to the memory 43.

As another method, the DBS center 11 sends the charge code of the cumulative amount r up to that point every 2.6 minutes from the start of the program, and the difference between the first received charge code and the last received charge code on terminal CPU39 and work ROI38
and calculate it in the work RAM 37 and write it to the memory 41,
There is also a method in which the contents of the memory 41 are added to the contents of the memory 43 and written to the memory 43 when the program is finished watching. In this case, each time the charge code changes, calculate the unit charge, calculate how many times 26 cents is, and use the work RA for that number.
The contents of the fee memory in M37 are incremented, and the incremented results are loaded into the memory 41 each time.

In either method, memory 41
The contents of are incremented by 1 bit.

The amount memory 47 is transferred to the memories 41, 43, 44 as shown in FIG.
The work F1. A I' (The contents of the charge memory in 37 are written to the memory 41, and when one program is finished watching (i.e., when switching channels, when detecting an end code, when turning off the power, etc.), the contents of the memory 41 are written. There is also a method in which the contents are added to the contents of the memory 43 and stored in the memory 43, and then read from the memory 43 at the time of reading.

Next, the PN key will be explained. As mentioned above, 9 beliefs
p Stores 12 bits of a 16-digit key code. P
The N key has 16 bits, the least significant bit (LSB)
The first 12 bits indicate the initial value of the PN sequence, and the 4 bits near the most significant bit (1,98B) indicate how many bits the PN sequence should be moved from the initial value. The initial value (12 via) indicated by the PN key of It performs inversion switching and arithmetic processing of the audio signal (audio is quantized in 12 bits), and then performs descrambling processing to restore the video and audio to their original state.

Another method may be to change the video and audio decoding method by 1H by shifting 1 bit for each PN sequence 'i1H obtained by substituting the 12-bit initial value.

The data such as the 2nd time of the 2nd day of the month is stored in the work RAM 37 and used as appropriate.

Next, interest addition is to be closed one month later or on the 10th of every month, and the contents of the memory 43 mentioned above are transferred to the memory 44. This is configured to be automatically performed when the message indicating the price shown in Fig. 6 is received. As the address at this time, it is possible to use a number common to all terminals (special number), or to use a spare one in C5 to send a packet with the address "-Sai". The key code and price code are ignored after the price display message.

When the price display message is received, (:jPU39 moves the contents of the memory 43 of the Kinzuri memory 47 to the memory 44,
The contents are written to the brightness memory 49 via the buffer 48 and pass line 40. In this case, the contents of the memory 44 are converted into a numerical pattern by the work ROM 38 and the CPU 39, and the numerical pattern is written into the brightness memory 49, so the contents are read out in accordance with the scanning of the electron beam of the 1ic RT 52 and sent to the CRT 53 via the buffer amplifier 61.
If you supply it to , the fee will be displayed in numbers on GPiT.

The buffer amplifier 61 may be provided with a function of superimposing normal program video and charge information, or a function of switching to display only the charge. Reference numeral 50 denotes an address circuit that provides addresses for writing to and reading from the brightness memory 49.

For terminals that do not pay the displayed fee to the bank by, for example, the 20th of every month, the amount of address control data is set to zero after the 21st, and the key code is set to ``ro'' and polling continues. As a result, if the key code is changed to a new one from the first of the following month, the terminal will no longer be able to decode the data, and the scrambled video and audio will not be decoded and cannot be viewed.

If the fee is insufficient, a key code will be sent, but if the contents of the memory 43 have not become zero due to the function of the 0PU39 of the receiver 16, the key code will be imported into the non-volatile memory 63. Scrambled video and audio cannot be decoded. Note that if the payment method fee is less than the amount stored in the memory 43, it is preferable to automatically display the difference to be paid.

Next, an example of fee settlement will be described with reference to FIG.

When the data corresponding to the paid fee E is sent from the DBS center 11, this data is sent to the work RA.
7 to be memorized. Before that, the contents of the memory 43 are transferred to the memory 44 according to an instruction from the CPU 39, but the contents of the memory 43 can be viewed from the time of the previous month's fee deadline until the data is received from the DBS center 11 until the payment is made. The contents of the memory 43 (
(numerical value) is larger than the content (numeric value) of the memory 44.

Therefore, the data indicating the payment method fee Xi in the work RA Σ 437 is compared with the contents of the memory 44, and when the two are equal, a flag of ``rao, 1, a2'' is set in the flag register 46, and when the fee is larger, the data is [1°! L1. a2
Raise the J flag. The contents of the memory 44 and the contents of the charge are subtracted by an addition/subtraction register 45, and the result is determined and a flag is set. Next, the charge E and the contents of the memory 43 are similarly compared, and when the charge E is larger than the contents of the memory 43, the flag is set to [&o, 111. OJ, and every time you finish watching a pay program, the contents of memory 41 and the contents of memory 43 (negative number)
When the contents of the memory 41 are larger than the contents of the memory 43, by setting the flags to rao, a, and IJ, it is possible to allocate the overpaid fee to the viewing fee for the next month's paid program. be.

Table 3 shows a list of these flags.

Now, when the contents of the memory 44 become zero, a=1 in the flag register 46 is detected and the CPU 39 takes in a new key code. If you create a program so that no new key code 1 is introduced during the period a, =O, you will not be able to watch the next month's paid programs unless you pay the fee.

Next, the key code reception operation will be explained.

With a newly subscribed terminal receiving device, 1 day in 1 month ~
During the 20th, only the current month key will be received. If the message in FIG. 6E indicates the current month's key, the current month's key code is written in the non-volatile memory 53A since the fee message does not output a signal indicating that the payment is unpaid or insufficient as described above. At this time, the R/W terminal of the memory 53A becomes "O" (low level), so the flip-flop (F,
Clear F,) and set its Q output as rOJ.

Next, after the 20th of the month, the next month's kill code is sent, and this is stored in the non-volatile memory 53B. Memo at this time! J 530 F, F4-set. In the next month, a key code change instruction is sent using, for example, a part of the spare byte shown in FIG. 5C, and based on this instruction, the receiver transfers the contents of memory 53B to memory 53A. Note while the Q output of memory 53C F, F, is at high level! Writing to J53B is not performed.

Since the CjPU39 always decodes the received signal using the key code stored in the memory 53, when the month changes, the R/W terminal of the memo jJ53A becomes "○" and the memo! If the Q output of +530 r'', F, is not rOJ, the operation is stopped and a message is displayed on the CRT 62 (this point will be described later).

On the other hand, if a new terminal receiving device is installed between the 21st and the beginning of each month, it will receive the current month's key and the 7th next month's key. The current month's key is written to the memory 53A, and the next month's key is written to the memory 53 at 4.

DBS Center 11 sends the current month's key first, and the hauling is done after that. Memo! Since the R/Vll terminal of 153A becomes "0", the F of memory 63C.

F is cleared, but the next month key sent later =
When received, F and F in the memory 53C are set.

In the next month, the contents of the favorite memory 53PS are transferred to the memory 53A based on the above-mentioned key code change instruction. At this time, the R/W terminal of the memo IJ esaA becomes rOJ.

From then on, S3G 2. F.

Q becomes "1".

Even if the power is turned off midway through, if the memory 63 is made up of a non-volatile memory, the contents will be retained. If the power is turned off for a long period of time or for some other reason, the memory 53
If the Q output of 00F', F, remains "1", please note!
Even if the contents of J53A are used to decode the screen, the screen does not return to normal, so when the receiver's operation button sends information to the CPU 39 to check, the Q output of the memory 5sc,
Alternatively, check the contents of the memory 63D (described later) and use the CRT5.
Above 2, "Key code - request to fzDBs center"
A message to the effect of this will be displayed.

It is also possible to compare the contents of the memo IJ53D, which will be described later, with the contents of FIG. 5G, to determine whether the contents of the memo 1J53A are correct, and to automatically display the message.

Here, a note! The role of J53D will be explained.

Memo! J5'3D receives the paid fee and stores it in amount memory 4.
This is a memory that stores the month and date when the contents of 7 were rewritten and the message code at that time. Four types of charge clearing messages as shown in Fig. 6F are prepared as shown in Fig. 7, and when the viewer (terminal user) pays the same amount as the amount displayed on the CXRT 52 to the bank, the DBS center 11 is notified. Then, the DBS center 11 sends the charge clearing information and amount in the message code shown in Figure 6 as described above. If this amount is the same as the content of the memory 44 mentioned above, the unpaid fee will be zero and normal reception will be possible from the next month onwards. Memo! l 5
3 I) stores the charge clear code A shown in FIG. 7 and the month and date of first reception. Clear code A will be sent at least several times. If the amount is insufficient, the insufficient amount will be displayed.

When the fee is paid for the insufficient amount, the DBS center 11 inputs the fee clear code and sends the amount code. Therefore, the receiver compares the contents of the memory 53D (month/day and type of clear message) with the received month/date and type of clear message, and only if the type of clear message is different, the amount of money will be charged based on the memory contents of the amount memory 47. Rewrite information. If the contents of the memory 44 do not become zero even after rewriting, the message that the fee is insufficient will be displayed again. At this time, take note! The clear code B sent later and the month and day are stored in the J53D. Prepare two or more types of clear codes and memorize them along with the date and time.
As described above, even if a clear code once received is sent successively, the malfunction of rewriting the contents of the amount memory 47 more than once is eliminated.

With the configuration as described below, there will be no malfunction even if the fee is paid in installments, and the key code can be easily changed every month.

In addition, to prevent eavesdropping, some programs from the contents of the work ROM 3B can be customized by putting them into the CPU 39, or the work ROM 3B can be divided into two parts and only the address can be stored as a fuse ROM, and the program can be stored in each terminal. Fuse R
The contents of the OM may be changed, and if the amount of the program is small, it can all be written to the ROM inside the CPU 39.

Effects of the Invention As described above, according to the pay television terminal device of the present invention, the following effects can be obtained.

(1) -4-way transmission (a pay TV system can also be implemented in the 'N system.

(2) A fee is charged in proportion to the amount of time a pay TV program is actually watched.

(3) Each viewing is difficult.

(4) By changing the viewing time in the minimum unit without changing the minimum unit of charge, the unit price of one program can be determined in small increments.

(5) Good compatibility with teletext systems, etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional pay television system, FIG. 2 is a block diagram of a pay television system in which the billing method of the present invention can be implemented, and FIG. 3 is an example of a receiver used in the system. The block diagram, FIG. 6, is a waveform diagram of a signal used in the receiver, and FIG. 7 is a message pattern diagram used in the receiver. 11-, -1) BS center, 12... large lapora antenna, 13... geostationary satellite, 14...
......No (labor antenna, 15...converter, 16...receiver, 1 completion...color TV receiver:, 18...bank , 19...
...Intermediate frequency demodulation unit, y) (IDU)
, 20...Data processing circuit, 21...Descrambler 122...Music/V regeneration circuit, 23...
・RF modulation circuit, 31...binarization circuit, 32...
・Clock detection circuit, 33... Sampling clock generation [71, 34... Main clock generation circuit, 36... Sampling circuit, 3
6... Latch circuit, 37... Work RAM
, 38... Work ROM, 39... Center processing unit (cpU), 40... Pass line, 41, 44.45... Non-volatile memory,
46...Flag register, 47...Amount memory, 49...Brightness memory, 60...,...
・Address [”l path, 61...Buffer amplifier,
62...CRT163...Nonvolatile memory. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3ul (Sono (J(J 0 (1) (-) 口 1

Claims (2)

[Claims] (1) Using a one-way television signal, billing information corresponding to the time spent watching a television program and the content of the program is received in the form of a digital signal at regular intervals, and the billing amount is determined in the receiving device of the terminal. The circuit determines and stores the amount, reads out and displays the fee data proportional to the amount as needed, and decodes the non-volatile memory that stores the fee information and the encrypted video and audio signals. A non-volatile memory for storing a valid key code signal is provided separately, and the key code signal memory includes a first memory for storing a currently valid key code and a second memory for storing a key code signal to be valid in the future. A memory is provided, and key code signals continuously sent from the sending side are written into the nonvolatile memory only once, and the contents of the charge information memory are stored as individual charge information for each terminal sent from the sending side. , :Pi,
The content of the second memory is stored in the first memory by storing a flag indicating the date and month of change and the type of charge information at that time + volatile memory, and key encoding code switching from the sending side. A pay television terminal device comprising a third memory for storing information transferred to the memory. (2) Even when different key code signals are stored in the first memory and second memory at the same time, the data is transferred from the second memory to the first memory and the same information as in the sixth memory is stored in the third memory. A pay television copy device according to claim 1, characterized in that the data is stored in the memory.