JPS60501684A - Stochastic scrambler and stochastic scrambling method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to signal processing (conditioning) for communication purposes. and more particularly to digital signal processing for communication purposes.

[Background technology]

The present invention is an improvement of a scrambler (SCram'bler) and K. The present invention relates to an improved method of scrambling. In the conventional technology, ``The term ``scrumbling'' is used in two different ways. It is used to mean a procedure used for the purpose of However, that Both procedures are used in the field of communications.

Scrampling (the term ``scrampling'' is a term used to describe when an unqualified person interferes with or ``wiretaps'' communications. (eavesarop) J to make something difficult or impossible It has been used to refer to signal processing that is commonly used. scramble , the data to be transmitted (typically digital signals) is sent to a confidential key (this is digital signal) or its derivative signal from 1”J of the secret key. will be carried out. An unqualified third party may interfere with the signal resulting from this scrambling operation. Even if it were possible to eavesdrop, it would be impossible for an unqualified person to eavesdrop unless they have key information. It is either impossible to extract the original data from the combined signal, or At the very least, it is difficult. By prior arrangement, qualified persons may By accessing the key and using that key, the combined signal sent The original data can be retrieved. This operating procedure is also often referred to as encryption. It will be revealed. See, eg, US Pat. No. 4.2') 1,931.

However, in the prior art, the term "scrambling" is completely Also used to refer to operations performed for different purposes. let someone send This digital data is a completely random event from the perspective of the communication device. General In order to synchronize the receiver clock, the receiver in the communication system must Relying on data transitions during communication messages is completely This is very normal. However, due to the random nature of the transmitted data, the received The data transitions fast enough for the machine clock to remain synchronized with the transmitter clock. There is no guarantee that it will be revealed.

Furthermore, some communication media exhibit non-uniform transfer functions as a function of frequency and 12 . Furthermore, the communication medium changes not only in frequency but also in time. , which is normal. To overcome this non-uniformity, tc.

The transmitted signal is divided relatively widely over the effective band. It should contain distributed frequency components. However, it is not possible to send Because the data to be transmitted is completely lantern, the frequency content of the data to be transmitted is There is no guarantee that it will be relatively widely distributed over the available band.

In order to overcome these problems and the same problem, the conventional technology uses a scrambling method. A protocol procedure is used in which the actual data to be transmitted is separated by another bit string (b lt, 5equence) (for example, using exclusive OR (χOR) operation signal for transmission and Ru. A parallel bit string (or scrambling bit string) is selected and transmitted. The final signal should have a higher probability of indicating a transition than relatively random data. . From another point of view, by using scrambling sequences, In this case, the energy in the transmitted signal is more extensive than the raw data to be transmitted. (The reliability of being distributed over the available bandwidth will increase.

The former scrambling is 1-encryption scrambling. scrambling) J, and the latter can be called [distributed scrambling] (aispersal scrambling) . The present invention relates to an improvement in distributed scrambling, which will hereinafter be referred to simply as scrambling. I'll call it Pulling.

The key to successfully utilizing such scrambling operations boils down to: It depends on the facts. In other words, Akira Akira GO-! 1i01684 (3) The receiving device is We have one piece of information that represents the scrambling bit string, and from this information we can The purpose is to obtain the lamp link bit string (cl, escribe). , Therefore, tVC is the difference between the received signal and the scrambling bit string at the receiving device. The data to be transmitted is transferred to the transmitting device using a supplementary process executed with the as before, before being combined with the scrambling bit string in the However, this transmission depends on being able to synchronize the data.

In the prior art, regularizing the transitions in the transmitted signal and/or distribution of the frequency components over the effective bandwidth to exhibit the desired characteristics. Many efforts have been made to select scrambling bit sequences to use. typical In prior art data scramblers, the transmitter and receiver are on the same pin. A repeated set of scrambling sequences is used. In other words, the transmitter and receiver are , using the same bit scrambling sequence to send different messages'1- Use repeatedly. See U.S. Pat. No. 4,214,209 in this regard. sea bream.

The methods and devices described so far do not work well for their intended purpose. On the other hand, their effectiveness varies. The transmitted signal is between a set scrambling sequence and varying or random data to be sent. This is the transmitted signal generated from the combination. The scrambling function is used when the transmitted signal is selected to increase the percentage of time it exhibits desirable characteristics such as those described in . death However, since the scrambling column is fixed, it can be obtained from any data column. It is not possible to guarantee that transmitted signals that have been transmitted will still exhibit those desired properties. do not have. In fact, for any bit string that does not have those desired properties and There are data sequences that produce transmitted signals that do not last as long as desired. specific street Depending on the communication system, some of the transmitted signals may not be received correctly. child Here, the term data refers to information whose communication resulted in a desired result. do. Scrampling (or descrampling) bit string should be sent A bit string that is combined with data to produce a transmitted signal or a received signal. A bit string that is combined to generate the data being communicated.

In the communications field, it is important to determine when a received signal is correctly received.1. used to determine There are normal procedures that can be followed. Furthermore, it is clear that the received signal was incorrectly received. It is normal to request its retransmission if it becomes a ``C'' or ``C''.

To the extent that the communication system represents time-varying parameters, retransmissions It is expected that this will result in a received signal that is received correctly on the second or third try, etc. Ru.

However, as long as the scrambling function works effectively, conventional communication systems The system does not have time-varying parameters, i.e. the second and subsequent In each trial, the system was able to decode with the same fixed scrambling bit sequence. In order to perform scrambling of the data that was incorrectly received on the first attempt. The same data will be sent. Of course, the results will depend on the second and third trials. The same is true for rows. Therefore, if a specific data sequence number (with respect to As long as a scrambling bit sequence is chosen that produces a clean transmitted signal, Rampling techniques do not improve the probability that the transmitted signal will be received correctly, and This may change the probability of correct reception on a second or subsequent retransmission. do not have.

Such prior art scrambling methods and devices can be said to be deterministic. . In more detail, the scrambling bit string is fixed and must be transmitted. The resulting data is sent unchanged (after the second or subsequent attempts). The signals (combination of the signals mentioned above) are also the same. If you send 'l* 1g issue If it exhibits undesirable properties at the time it is initially created, then it is It will exhibit the same characteristics each time it occurs.

Therefore, one objective of the present invention is to eliminate the deterministic nature of scrambling. and to promote the effectiveness of scrambling.

The above-mentioned feature of the invention provides that the transmitter can be By generating 5 different focusing sequences, This is realized in the transmitter. Complementary changes are also required at the receiver for the following reasons. Changes are necessary. In conventional technology, the scrambling bit string is fixed. as long as the receiver keeps the same bits during its descrampling operation. columns are used. By making the changes described above in the transmitter, the device It is no longer possible to use fixed bit strings in scrambling operations . Further 1 (in detail, the bit string used for the descrampling operation is Must be the same bit scrambling sequence used in the ring operation. No. Therefore, for this purpose, a descrampling operation is performed in the receiver. A mechanism is provided so that the bit string used for the operation can be predicted or determined. I need to be there.

One of the techniques for providing the receiver with information on the bit string used in the scrambling operation one is at the same time that the message is sent, or before it ((()). Immediately after that, the bit scrambling sequence is also transmitted. Paraphrase , the message contains (prior to, immediately after, or in parallel with) , it is possible to accompany some data such as era name to define the bit scrambling sequence. I can do it. This data is then used to derive the entire bit scrambling sequence. It may be information on the species (5eecl) that can be identified, or it may also be Either identify the rumpling bit string directly or use a bit screen from it. Any ordinal number that identifies the species from which the Rampling sequence can be derived. e number). Anything other than these is obvious to a person skilled in the art. It will be clear.

Therefore, the bit scrambling sequence used at the transmitter (and the desk The corresponding bit scrambling sequence used in the ramping operation is time The present invention uses probabilistic scrambling as long as it changes from message to message. Apparatus and methods therefor are provided. probabilistic (probabj, 1istic ) is an adjective that indicates the nature of the transmitted signal (data (combination of data sequence and bit scrambling sequence) is not possible. means. The transmitted signal generated from this combination is used for the scrambling operation. Since the bit string used is not fixed and changes, it is impossible to determine It is possible.

Accordingly, in one aspect, the present invention provides a reasonable frequency for the receiver clock. Scramping the transmitted data so that a transmitted signal that provides a transition is generated It provides a method and consists of the following steps: a. Generating a scrambling bit string; b. The above scrambling bit string. Generating a signal to be transmitted by combining the bit string with data for -F transmission , here, the improvements are as follows; C1 due to the combination with the above data periodically generating different scrambling bit sequences.

According to another feature of this aspect of the invention, the steps (al) include: nothing: 1. Generating species information; 11. Loading the above seed information into a shift register, 1j1. The above species information Shift in the above register to generate the above scrambling bit string. In this case, the step fcl periodically generates new species information. Contains.

In another aspect, the invention includes the following steps: The transmitted message data is scanned to generate a transmitted signal that gives the appropriate frequency of transitions. Provide a method for clamping.

a. generating a scrambling bit string; b. scrambling; ・Generate a transmission signal by combining the focus row with transmission data. , the improvements are as follows; c. ``Including a bit identifying the scrambling bit string in the transmission signal. To meditate.

According to a further particular feature of this aspect of the invention, the invention provides the above-mentioned bits. A profile file containing species information that generates the above scrump 1 non-bit string by A method for identifying scrambling bit strings is provided.

According to yet another aspect of the invention, the transmitter 1 is scrambled and the receiver Apparatus for obtaining a transmitting signal providing a reasonably frequent transition for a clock, comprising: A device is obtained comprising:

Means for generating a scrambling bit string, the above scrambling bit string This is a means of generating a transmission signal by combining the transmission data and the transmission data, and the improvements here are as follows. is as follows: By controlling the means for generating the above scrambling bit string, different scrambling bit strings can be generated. A device that periodically generates a string of bits.

Furthermore, still further features of the present invention include the following means: can be obtained by combining the above means of generating a sequence of cuts: means for generating species information; means for loading the species information into the shift register; Shift through the register to generate the scrambling bit string. means for controlling said means for generating a scrambling bit string; The above-mentioned stage for the purpose of the present invention includes means for periodically generating new species' information. −(Means such as

[Brief explanation of the drawing]

Here, a more detailed explanation of the present invention will be given in line 1□・, for those skilled in the art or with assistance. By referring to the attached drawings, the same practicality as described in the following parts of the unclear specification can be obtained. Examples can be created and made available. Attached drawings (F-8 same reference) Reference symbols indicate the same parts.

Figure 1 shows a typical example employing the scrambling and desclamping methods and equipment. A typical communication link is shown.

Figure 2 schematically shows the scrambling function and/or desk clamping function. (C Explain.

FIG. 6 shows an apparatus in conjunction with a conventional scrambler according to the method and apparatus of the present invention. FIG.

FIG. 4 is an example of a scrambler suitable for use in accordance with the method and apparatus of the present invention. be.

FIG. 5 shows a descrambler used in accordance with and in conjunction with the method and apparatus of the present invention. FIG. 2 is a block diagram of a blur.

FIG. 6 shows details of a descrambler suitable for use in accordance with the method and apparatus of the present invention. It is a detailed drawing.

[Detailed description of preferred embodiments]

As shown in FIG. 1, digital information is transferred from a data source 10 to a data sink 60. Apparatus for transmitting includes a modulator in response to a signal provided by data source 10. includes a scrambling device 20 that provides output to 30; Modulator 30? Their outputs (transmitted signals) are transmitted to a remote location, where a demodulator 40 converts the received signals. provides an output to the descrambler 50 in response to the signal. Descrambler-50 The output of is given to data synchro 0. Those skilled in the art will understand that FIG. Only the parts related to Scramp Ring and Desk Clamp Ring operations are shown. It will be appreciated that other conventional devices are not shown.

Figure 2 shows a typical scrambling or descrampling process. This figure shows the process diagrammatically. Figure 2 has inputs to A and B and an output to C. w + ) 5 is shown. This gate 5 is, for example, X O, R gate. good. To the two inputs (・The data to be sent (B) and the scrambling bit A sequence (A) is given. The output (C) result is the transmitted signal, i.e. scrambled This is the data obtained.

The same equipment can be used to perform desk clamping operations. If the (called a sampling bit string), the input (B) is a transmission signal (or reception signal), That is, scrambled data is provided. The resulting output (C) is the original data data.

Prior Art Scrampling Process or Descrampling Process R In this case, the bit string (input A) is fixed. That is, it repeats periodically. will be returned. On the other hand, according to the invention, in order to perform stochastic scrambling In this case, the device shown in FIG. 6 is used in conjunction with the scrambler 20.

As shown in FIG. 6, the data source is connected directly to the input of the scrambler 20. Instead, it is connected to the scrambler through the gate 15. data source 10 to the scrambler-20 and new elements, species. A timing and control device 17 is added for controlling the information source 16. There is. Seed information source 16 is coupled to scrambler 20 through the same gate 15. ing. In operation, the data is combined into the scrambler 20! lead with , timing and control device 17 provides information on the screen from the seed information source 16 through the cage 15. Transfer of species information to Rambler-20 is started. Once the species information is Once sent to the rambler 20, the timing and control unit 17 controls the The operation of the information source 16 is prohibited, and the data passes through the gate 15 to the scrambler 20. allow it to pass. These features make stochastic scrambling effective ( (The contributions to the process are shown in more detail in Figure 4. The components of the scrambler 20 are shown diagrammatically (τ).

As shown in FIG. 4, the input from gate 15 to scrambler 20 is R Ketra 501 is coupled to human power. The output of XOR gate 25 is a switch It is coupled to terminal 2 of S0 at f7. Terminal 1, which is the other seven terminals of switch SL is a binary signal of a known pattern - length) connected to the "mouth" signal source. ing. Immediately r+%Ym Switch S work co-face 3″jllj　”f” i ma) is coupled to an input of a shift register 26. K-bit shift register 2 6 is provided with a clock from a clock source not shown. shift register 2 Each stage of 6 is connected to a second XOR gate 270 input. XOR gate The outputs of 27 are coupled to the seven terminals of a single-pole, single-throw switch s2. switch s The other terminal of 2 is coupled to the other input of XOR date 25. Finally, XOR The output of gate 25 is also coupled to modulator 3o.

In operation, prior to sending a message, switch S1 is set to position 1; Switch s2 is open. This state applies to each stage of the bit shift register 26. be held long enough to memorize the "mouth" in it.

In this state (C), K pinot type information can be selected. K bit type information ( For example, the seed information source 16 is extracted immediately before the data to be transmitted, The data is input to the gate 25. One embodiment of the present invention (in which the first bit of species information is valid in the XOR gate 25, switch sl is in position 2 At the same time, the switch s2 is closed. This state is the entire 41 blue report are held until combined through XOR date 25. Immediately after this kind of information , the data to be sent continues, but it is also combined through XOR key]・25 has been done. Seed 1n Report - The route through which Deke is sent is Ke15. from bit 15 to r-) 25, through switch Sl, through the star, gate 27, switch 82 (this is closed), xoRr-) 25 and reaches the modulator 30.

(starting from date 15) 1 for each data bit given to gate 25. It is XORed with the output of the gate 27, and the result (transmission signal) is sent to the modulator 30. be forced to pass. The first bits of the transmitted signal are used to identify species information. The scrambled data that follows is used to extract the raw data. reactor.

After the last data bit, the switches are reset and the shift register is ” and preparations are made to receive the seed information for the next message. this (Alternatively, the next message can follow immediately after the first message.) the switch position shown in Figure 4 is maintained; the timing and control system Species/Source 16 is prohibited until such time as 17 decides that new species information should be used. It will be left as it is. At that point, the process already described is repeated. That will happen.

As a result of the foregoing process, the transmitted signal (output of date 25 coupled to modulator 30) power), but it comes in two separate parts (at least a new source). ) for the first message sent together. The first part is Contains species information, which along with various data inputs to the XOR date 25 (shift (through multiple connections to date 27 from different stages of the register) It is. Transmission of scrambled species information (followed by scrambled Data is sent. Each message that follows (without changing species information) ) and carries only scrambled data. This operation uses species information Before the shift register 26 is introduced, the shift register 26 is set in a certain known initial state ( request something. Throughout the data transmission period, Kate 27 scrambles the data. generates a scrambling bit string that is used to

Furthermore, the species information can be sent in unscrambled form, and then immediately Scramble +'l data is sent. This also applies to the device shown in Figure 4. Another method of operation is described below.

Similar to the operation described above, each stage of shift register 26 is set to 10''. child For example, keep switch S1 in position 1 and leave switch S2 open. , clock the shift register for a number of times at least equal to its length. This is done by Once the bit shift register 26 has completed each stage, 0, switch S1 is shifted to position 2 and switch S 2 is kept open. After the seed 1 green report passes through r-ts 15 and 25, it is fills the entire shift register. However, the species information also goes to the modulator 30. It is sent unchanged (through gate 25). Species information is not changed because This is because S2 is open and the only input to gate 25 is the seed/clearance information. this After that, switch S2 is closed.

The next data bit at the input from gate 15 to gate 25 is the first data bit. It's Tavit. The switch (Sl etc. 82) is kept in this state and each of the tails is The bits are shifted through the gate 25. Scrambled data is sent After the switch is reset, the switches return to their normal state. Or shift register The data retains its state after the last data bit and sends the next message. It is also possible to enter immediately through address 15.25. This latter behavior In this case, the species information is transmitted in unscrambled form (output to the modulator), The data following the species information is scrambled.

The species information source 16 indicates that the timing and control device 17 requires new species information. It is possible to supply a bit string of random 1-like bits each time it is displayed. a Alternatively, the species information source 16 may be a droplet counter, which receives new species information. is incremented each time is used. In this embodiment, each bit type i! Information is preceded by a counter that is larger than the bit type information (・5. In other cases, a species 1 report produced by species source 16 may be Combination of the contents of the counter that is updated each time the address is specified and the random bit string It may be set.

The shift register 26 shown in FIG. 4, of course, has multiple stages. Fourth The figure shows that it has multiple stages and multiple connections to cage 27. Although it is intended to show [2], not all columns are shown, Also, not all connections to keys 1-27 are shown. K-bit Shift register and date 27 are linear feedback shifts like performing basic polynomials It is desirable to configure registers. The result of this device (output of gate 27 ) is the maximum value of 11<, which is appropriate, and τ has the product density C deak transition: ~ It is possible. For example, for a 15-stage /ft register, the following polynomial or This is a good choice.

g(x)=　x15+x”’+x”+x’+x2+x+1 Figure 5 shows the method of the present invention. The timing and control device 45 is attached to the scrambler 50 in accordance with the law and equipment. It shows that you are following. The descrambler 50 has a shape shown in FIG. Anything is fine. Figure 6 shows a similar bit shift register 56 with a switch. switch S3 (similar to switch S1 in the transmitter). It is growing. Terminal 2 of switch S3 is the input from demodulator 640, It is also coupled as one input to 55. K-bit shift register 56 is combined with a typical date 54 (as will be clear to those skilled in the art, Although not shown in the diagram, some steps 54 may be required depending on the particular polynomial chosen. ). The output of r-) 54 is (sent) through switch S4. (similar to switch S2 in the transmitter) and is coupled to the other input of date 55.

The output of gate 55 is connected to data synchro 0 through AND) f'''-457. are combined. The other input to AND gate 5γ is timing and control device 45. It is given completely. As will become clear below, the output of gate 55 is Contains bits corresponding to species information. This is required by data sync 0 According to the information provided, there are 7 steps, so the timing and control @ M45 inputs to the gate 57. The control prohibits this information from being coupled to synchro 0. this In this manner, timing and control unit 45 performs a It is designed to allow light to pass through.

Operate switches S, -S in the same way as you operate switch 5l-82. Converts a desk clamping operation to a data-only desk clamping by can be limited, or alternatively, also cause descrambling of species information. You can also do that. Of course, the mode selection for the operation of switches S3 and 84 depends on the transmitter. should be done depending on the mode of operation employed.

Typically, the K-bit shift register 56 is , a known bit pattern (same as the known bit pattern used in register 26) 1; all "0" in the examples described below) should be indicated. This is up to you. Traditional methods of This is done by keeping switch S3 in position 1. After this, switch S3 is moved to terminal 2 for inputting species information and data. If the species information is on the desk If it has to be rumbled, switch S3 is switched to terminal 2. At the same time, switch S4 is closed. On the other hand, if the species information is not scrambled, If the seed information is stored in the shift register 56, the r-ta arrives. Until the start, switch S4 is held open. Under these conditions P, the spots are Of course, switch S4 and date 57 are driven simultaneously.

Figures 7, 8, and 9 correspond to different modes of operation in the transmitter (those skilled in the art A person would be able to draw a similar diagram corresponding to a desk clamping operation) .

More specifically, FIG. Shown as numbers. For example, as shown in FIG. It is located in 1. This switch clears the K-bit shift register to "0". remain in this position long enough to guarantee that the After this, switch S1 position 2 is toggled, switch S2 is closed, and the K-bit species information is transferred to species information source 16. are connected through gate 15. After the last bit of K-bit type information Then, also through date 15, an M-bit data string is connected from data source 10. will be combined. The output of the scrambler 20 also contains the scrambled bit type information. the first part of the information followed by scrambled M-bit data; It is shown as.

FIG. 7 shows this column as repeating. i.e. the end of the data , switch S2 opens, switch S1 assumes its position 1, and the sequence start again.

Figure 8 shows that even though only a single species information is used, the length of the data string is actually multiple. Identical to above, except it is made up of several different messages.

FIG. 9 is different from FIG. 7 or FIG. 8. As shown in FIG. , except that switch S2 is open until data arrives from The sequences are the same. As a result, the output of the scrambler is again divided into two parts. or, in this case, the striped bit type information r in unscrambled form. This is the output. Following this, scrambled M-bit data is output. .

Therefore, it is clear that the present invention performs a stochastic scrambler . First, each message or messages is given a different scrambling bit. The rows of lines are blurred. The scrambling bit string is a data source 10 whose data is When input to OR date 25, it is input to XOR date 25 through switch S2. is the given column. Therefore, in order to perform proper descrambling, machine) unless you have some knowledge about scrambling bit strings. No. This knowledge is stored in a scrambled format as shown in Figures 7-9. The species information is scrambled or scrambled prior to transmission of the Obtained by sending in a form that is not intended. Species information before mesosage Although it is perfectly natural to send a message, species information Memorize the seed blue report and scramble it as it needs to be used to Send your comment and after 62 seconds please confirm your approval (scrambled or It is clear that sending (in unrumbled form) is within the scope of the invention. It is. Alternatively, species information can be sent over parallel channels.

Alternatively, the species information for descrambling purposes can be reproduced at the receiver. If some data is sent that is sufficient to The retrieved species information does not need to be transmitted. For example, if the species information source 16 contains different species information, which are counted once for each transmission by a counter. address is specified, and at the same time 1 (the counter is also incremented). Let's consider an example where

The receiver (e.g. in the timing and control block 45 (τ)) also has a counter. Therefore, it is addressed. Similar storage of descrampling bit type information contains an array that is The logic in FIG. 4 applies the state of the counter to modulator 30. Changed by. In this configuration, the output of Key-1-25 is If so, the seed 1 green report (in scrambled or unscrambled form) It is blocked for the duration of the transmitted signal and the state of the word counter is changed to the modulator ( (Given.

After the counter state has been transmitted, the χOR gate 25 returns to the modulator 30. The scrambled data is then transmitted. In the receiver, counting The reception of the state of the device is the address of the descrampling bit string or the type 1 green report. For dress specification (τ is used.

The connection from the demodulator to the descrambler is logically controlled by connecting terminal 2 to the descrambler. The output of the demodulator is blocked until the sampled data arrives. From that point onwards Before selecting the appropriate desk clamp line by this transmitted data of the counter The output bit string is input to the bit shift register.

+3 〉 ■ 45 FI67 I69 international search report

Claims (1)

[Claims] 1. To generate a transmit signal that gives the appropriate frequency of transitions to the receiver clock A method for scrambling data to be sent to a computer, comprising the following steps: a. generating a clumpling bit string; b. the scrambling bits; generating a transmission signal by combining the above-mentioned data for transmission, and immediately As a point; c, periodic 1 (occurrence of different scrambling bit strings, The aforementioned method comprising. 2. The method according to claim 1, wherein the step 1al comprises: 1. To generate a seed↑blue report; 11. Load the above species information into the shift register. 111. Load the above species information onto the shift register. generating the scrambling bit string by shifting through the register; and the step icl includes periodically generating new species information. The method described above. 3. To generate a transmit signal that provides an appropriate frequency of transitions to the receiver clock , a method of scrambling data to be transmitted, which includes the following i@:a, generating a scrambling bit string; b. An excellent example is to combine the above transmission data with the above transmission data to generate the ten transmission self-signs. As a point; C0 The transmission signal includes a bit that identifies the scrambling bit string. The said method comprising: 4. The method according to claim 3, comprising: 1. l’e scrambling bit string The bits to be identified are seeds I for generating the scrambling bit string. # information. 5. The method according to claim 3, wherein the scrambling bit string is identified. The above bits are used as an incremental counter to select the appropriate scrambling bit string. Said method comprising number counting. 6. To generate a transmission signal that gives a transition of an appropriate frequency to the receiver clock A device for scrambling data to be transmitted, comprising the following means: :a. means for generating a scrambling bit string; b. Generate a transmission signal by combining the above scrambling bit string with transmission data. As a means of protection; 1- As a defective point, C1 Controls the above means for generating the scrambling bit string to generate different scrambling bits. means for periodically (C) generating a clamping bit string; The device as described above, comprising: 7. The device according to claim 6, which generates a scrambling bit string. The above means are each of the following means: means for generating 10 types of information; Il, means for loading said species information into a shift register; 111, by shifting the seed information through the shift register and transmitting it to the scram reply. a means for generating a scrambling bit string, the means for generating a scrambling bit string; The above means for controlling the above means to generate new species information periodically. means including means for The device as described above, comprising: 8 To generate a transmit signal that gives transitions at an appropriate frequency with respect to the receiver clock + C. A device for scrambling data to be transmitted, which includes the following means: 2a. means for generating a scrambling bit string; b. Generate a transmission signal by combining the above scrambling bit string with transmission data. Means for C2 One or more bits identifying the scrambling bit string in the transmitted signal. is a means containing multiple bits, The device as described above, comprising: 9. The apparatus according to claim 8, which identifies the scrambling bit string. said means for inserting one or more bits to and means for generating seed information useful for generating a bit string. Said device. 10. The device according to claim 8 applies the scrambling to the transmitted signal. - the above means for adding one or more bits identifying the bit string, A counter for identifying a selected one of multiple scrambling bit strings. A device as described above, comprising: