JPS5986345A - Transmission control system of pattern information - Google Patents

Abstract

PURPOSE:To transmit the mixture of various information without losing time information in transmission information by operating a low-order bit of the said information in eliminating a transmitted inserting bit. CONSTITUTION:When the various pattern information including voice is inputted, a real time data is applied to a transmission data converting circuit 100a by a data discriminating circuit 2, and its output and other data are applied to a transmission packet assembling circuit 3. The circuit 3 checks sequentially the real time signal from the most significant bit, inserts a bit after the apperance of specific bit pattern, forms a signal neglecting the bit exceeding the least significant bit location of the real time signal by the inserting operation, and transmits this signal and the data signal after assembling the data into a transmission packet by using the discriminating signal. The received data is separated into the real time and other information by a transmission packet separating circuit 8 and a data discriminating circuit 9 and applied respectively to a receiving data converting circuit 100b and a data processing circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission control system for mixed transmission of pattern information such as images and sounds.

2. Description of the Related Art Conventionally, as a method for mixedly transmitting pattern information such as multiple images and sounds, there is a method, such as a television method, in which video signals and audio signals are assigned to separate transmission frequency bands and simultaneously transmitted. In addition, when using a digital transmission path or transmitting a digital signal using a modem, a method of mixedly transmitting image information, audio, or various data is to use the pulse train of the digital signal. There are ways to transmit different types of information. In these methods, the bandwidth and transmission speed of the transmission path for transmitting images and audio are determined in advance, so the entire transmission path cannot be used, for example, when transmitting only image or audio information. However, it has the disadvantage that only some transmission bands and transmission speeds can be used.

On the other hand, when transmitting various information such as images and audio using the entire transmission path, rather than dividing the transmission path to transmit image and audio information, it is necessary to identify the type of information behind it. need to be able to do so. As such a method, when transmitting information such as images and audio via a digital transmission path, an identifier indicating the type of information is assigned to each piece of information, and the type of information is identified and decoded based on the identifier. There is a way. The problem with this method is that in order to be able to identify the information identifier, it is necessary to manipulate the information so that the pattern of the identifier does not appear in the information. It is necessary to insert an additional bit and perform operations such as deforming the ... and turns. Due to such operations, there is a drawback that information that needs to be transmitted in real time, such as voice information, cannot be transmitted.

In order to mix and transmit real-time information such as images, data, and audio information through one transmission path, the present invention uses an identification signal for switching between information, and the identification signal does not appear in the information. It is characterized by performing a bit insertion operation and transmitting it, and when receiving this and removing the inserted pit, the lower bit side of the information is manipulated, and the purpose is to manipulate the time information of the information to be transmitted. The objective is to mix and transmit various types of information without loss.

When transmitting digital information via one transmission path, there is a method in which the information is divided into transmission units and transmitted in transmission units called 9 bits. FIG. 1 shows an example of a transmission system, where ■ indicates a unit of information transmission, F is a code called a flag indicating a packet delimiter, and C is control information for performing various controls.

When receiving such information transmitted in units of . or kerat, the content of the information I can be known by first identifying the code of the flag F and checking the control information C that follows.

However, in order to be able to perform such an operation, it is necessary that the code F must be uniquely identifiable, and for this reason, a conversion process such that the pattern of the code F does not appear in ■ is required. It becomes necessary. For example, as the code F, "0"
When using the pattern 1111110, make sure that this no or turn does not occur in C and I.” 1111
]'' When the mother turn of ``'' appears, there is a method to prevent the above code from appearing by inserting a ``0'' bit after it. When receiving and decoding this, conversely, insert the above bit. An operation is performed to remove the bit "o". However, this method has the problem that the speed of transmitting the information becomes slow because a significant bit is inserted regardless of the content of the information. These problems make it difficult to apply the method to information where the time axis must be accurately preserved, such as real-time audio information.

FIGS. 2 and 3 are diagrams showing the concept of information transmission control and reception control in the present invention. In general, computer information such as images and audio is multi-quantized and converted into a digital signal at a certain frequency.For example, audio is often converted into an 8-bit digital signal at a frequency of 8 kHz. .This kind of quantized data per sampling is called a word here. Figure 2 shows the conversion method for sending each word. 1 of flag F indicating the delimiter of packets
'Indicates the action to prevent a turn from occurring. First, bit numbers and turns are sequentially checked from the MSB side of the first word of the original pattern shown in (,) in the figure, and a look turn of "111111" is searched for. In the example in the figure, the above 74 turns exist from the 6th bit to the 1st bit of the first word and from the 4th bit of the second word to the 7th bit of the third word, so there are Insert the PaO” bit. At this time, as shown in Figure 2 (b
), by performing bit insertion, the following bits are shifted to the LSB side, but the bits that exceed the boundary of the word of interest are removed. By performing such a conversion operation, it is possible to prevent the flag F pattern from occurring in the transmitted information.

On the other hand, when receiving the transmitted signal information, an inverse transformation as shown in FIG. 3 is performed. That is, the bit pattern is checked sequentially starting from the MSB side of the received first word, and
When an R-turn of 11110" is detected, the last "0" bit of that pattern is removed. At this time, as shown in Figure 3(b), by removing the bits, the following The bits are shifted toward the MSB side, but the shift beyond the boundary of the word of interest is not performed, and "0" is inserted for the missing bits.

By performing such an inverse conversion operation at the time of reception, data in which the LSB side bits are partially converted compared to the original data is obtained.

That is, by performing the above-described more advanced transmission control and reception control, only the bits on the LSB side of the digitized information are affected, and it is possible to prevent a flag pattern from occurring in the information. Moreover, since the boundaries between the words of information are taken into account in bit operations, the time axis does not change during information transmission, and real-time transmission such as voice can be performed.

FIG. 4 is an embodiment of the present invention, and is an example of a device configuration for performing a data conversion operation when transmitting information. In the figure, 101 is a data input terminal, 102 is a data buffer register, 103 is a shift register, 104 is a pattern comparator, 105 is a data register for comparison, and 106 is a comparison data input terminal for setting data in the register 105. , 107 is an output shift register, 108
109 is an output data buffer register, 109 is a word counter, 110 is a clock input terminal, 111 is a data output terminal, and 112 and 113 are a dart circuit and a delay circuit, respectively. The operation of this will be briefly explained. First, first data is set in the register 102 from the input terminal 101, and also set in the shift register 103, and read out in accordance with the clock input from the clock input terminal 110. On the other hand, comparison data is sent to the comparison data register 105 from the comparison data input terminal 106 in advance.
is set to . This is, for example, the bit/turn '11111' as described in FIG. It compares the content and outputs an output signal when there is a mismatch.This output signal and the shift register 1
A logical sum signal of the signals read out from 03 is generated by the gate 112 and stored in the output shift register 107.

At this time, if the bit pattern is thicker than the content of the comparison data, the comparator will not output a mismatch signal and a 0'' bit will be stored in the output soft register.On the other hand, the clock signal will be When one word is completed, the contents of the output shift register 107 are stored in the output buffer register 108 and output from the data output terminal 111. Gutsufu completion register 102
The next word 8 data is set in the shift register 103 via. As described above, each time a specific g-turn as explained in FIG. 2 occurs, it is possible to insert a P0'' bit immediately after the g-turn.

Next, FIG. 5 shows an example of a device configuration in which only 115 data conversion operations are performed when receiving information. In the figure, each circuit is the same as that shown in FIG. 4, so the explanation is omitted, but in this circuit, for example, the bit turn "111110" e [put out, its pitch], the last " Perform an operation to remove the 0'' bit.

FIG. 6 shows a configuration example of an information transmission control device according to the present invention, in which 1 is a data input terminal, 2 is a data identification circuit, and 10 is a data input terminal.
0a is a transmission data conversion circuit shown in FIG. 4, 3 is a transmission packet assembly circuit, 4 is a transmission line transmission interface circuit, and 5 is a data output terminal to the transmission line. In the figure, when various types of signal information including voice etc. are inputted through the input terminal 1, the real-time data is applied to the output data conversion circuit 100a through the data identification circuit 2, and the output and other The data is input to the EM stand-up circuit 3, and a transmission signal as shown in FIG. 1 is generated. This packet is sent to the transmission line by the transmission line transmission interface circuit 4.

On the other hand, FIG. 7 shows a configuration example of an information reception control device according to the present invention, in which 6 is a reception data input terminal, 7 is a reception interface circuit with a transmission path, 8 is a transmission packet disassembly circuit, and 9 is a reception interface circuit with a transmission path.
100b is the received data conversion circuit shown in FIG. 5, and lO is the data processing circuit. In the figure, data received via the transmission path is received at the reception data input terminal 6.
The received data is transmitted via the reception interface circuit 7 and separated into real-time data such as voice and other information by the transmission A kerato decomposition circuit 8 and data identification circuit 9.

Of these, real-time data is received by the reception data conversion circuit 100b.
The data is converted and output to the output terminal 12.

Other data is subjected to various reception and interpretation processes by the data processing circuit 10.

Such transmission and reception control processing is performed by HDLC.
As the sending packet assembling circuit in the figure and the receiving 74 packet disassembling circuit in FIG. 7, it is possible to use devices used in existing HDLC control procedures.

In addition, in the above explanation, "0111
1110'' flag pattern or turn is used, but as is clear from the above explanation, the present invention is not limited to such a flag pattern format, and any bit or mother turn can be used as an identifier. be able to.

Alternatively, by applying the above method, multiple identifier patterns can be used.

This can be easily realized, for example, by providing a plurality of data conversion devices as shown in FIGS. 4 and 5 and performing a data conversion operation on each identifier pattern.

As explained above, when transmitting a mixture of real-time information such as audio and video, and still images and other data signals, one transmission path can be switched arbitrarily.
Not only can transmission efficiency be improved, but also information can be switched arbitrarily during transmission, making it easy to control. This means that, for example, the various types of information mentioned above can be transmitted by applying the well-known HDLC transmission control procedure.

Further, the data conversion circuit for carrying out the present invention has the advantage that it can not only be easily realized using existing semiconductor elements, but also can be easily integrated into an integrated circuit.

In the above explanation, we have described the case where various information is transmitted using a transmission line, but this method is not limited to the case where a transmission line is used. The distribution of processing routes during processing can also be applied to such matters.

[Brief explanation of the drawing]

Figure 1 is an example of a conventional transmission system, Figures 2 and 3 are conceptual diagrams of data conversion in the present invention, Figure 4 is an example of the configuration of a data conversion device at the time of transmission, and Figure 5 is at the time of reception. FIG. 6 shows a configuration example of an information transmission control device according to the present invention, and FIG. 7 shows a configuration example of an information reception control device. 1...Data input terminal, 2...Data identification circuit, 1
00a... Sending data conversion circuit, 3... Transmission packet assembly circuit, 4... Transmission line transmission interface circuit,
5... Transmission data output terminal, 6... Reception data input terminal, 7... Receiving interface circuit, 8... Transmission and gas decomposition circuit, 9... Data identification circuit, 10.
...Data processing circuit, 100b...Reception data conversion circuit, 102.105, 108...Data buffer register, 103,107...Shift register, 104-
... iR turn comparator, 109... word counter.

Claims (2)

[Claims] (1) In a system in which a real-time signal such as a data signal and a pattern voice are mixed and transmitted through one transmission path using an identification signal that distinguishes the type of information, the real-time signal is sequentially examined from the most significant bit and identified. a first means for performing a bit insertion operation after the appearance of the bit pattern of the real-time signal, and converting the real-time signal into a signal in which bits exceeding the least significant bit position are ignored; , a third means for receiving the received signal and disassembling the transmitted packet to identify the data signal and the converted real-time signal; The most significant bit of the converted real-time signal is sequentially examined, and after a specific bit pattern appears, a bit removal operation is performed, and the least significant bit of the real-time signal is removed by the amount of bits missing due to the bit removal operation.
and fourth means for obtaining a real-time signal by converting into a signal with arbitrary bits inserted into the pattern information. (2) Using a plurality of identification signals that distinguish the types of information, after the appearance of a plurality of specific bit patterns in the real-time signal, a bit insertion operation is performed, and a plurality of specific bits are extracted from the received converted real-time signal. Claim No. 1 characterized in that a bit removal operation is performed after the appearance of a pattern.
) Transmission control method of pattern information described in section 2.