JP2003008447A - System encoder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system encoder that can prevent an output of a TS(transport stream) or a PS(program stream) at a high transfer rate resulting in causing deficiency of an available band in a transmission line of an output destination even when the encoder receives data at any transfer rate. SOLUTION: An input rate detection section 101 of the system encoder 10 detects an overall input bit rate of input data, compares the detected bit rate with a threshold value for TS or PS output stored in a threshold value storage section 109, and a processing control section 107 allows an output format conversion section 104 to stop format conversion when the input bit rate exceeds the TS output threshold value or allows an output format conversion section 105 and an IP conversion section 106 to stop format conversion when the input bit rate exceeds the PS output threshold value as its control.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the transmission of digital signals, and more particularly to a system encoding device that performs system coding on an input video signal, audio signal, etc. and outputs the result.

[0002]

2. Description of the Related Art In recent years, as a transmission system for digital signals such as video and audio, it conforms to the ISO / IEC13818-1 standard (hereinafter referred to as "MPEG2 system standard") defined by the International Organization for Standardization / International Electrotechnical Commission. Many systems have been built.

A conventional device for converting a video signal and an audio signal into a format for transmission in accordance with the MPEG2 system standard will be described below. FIG. 15 is a diagram showing a schematic configuration of a conventional program encoder that converts a video signal and an audio signal into a format for transmission. Program encoder 8
Reference numeral 05 basically includes a video encoding unit 801, an audio encoding unit 802, a system encoding device 803, and a system control unit 804 that controls these units.

Here, the video encoding unit 801 and the audio encoding unit 802 compress and code the input video signal or audio signal, respectively, and use an access unit (AU) data string which is a unit that can be independently expanded. A certain video elementary stream (video ES) or audio elementary stream (audio ES), and a video ES or audio E
A video packetized elementary stream (video PES) or an audio packetized elementary stream (by adding S to the stream ID indicating the attribute, time information for decoding, time information for display, and the like to form a packet. This is a mechanism for generating audio PES) and outputting it to the system encoding device 803.

Further, the system encoding device 803 is
It is a device that generates and outputs a transport stream (TS) and a program stream (PS) defined in the MPEG2 system standard by time-division multiplexing input video PES, audio PES, and other data.
FIG. 16 is a diagram showing an internal configuration of a conventional system encoding device 803.

As shown in the figure, the system encoding device 803 basically includes a video PES processing unit 901 and an audio P.
ES processing unit 902, TS generation unit 903, and PS generation unit 9
Have 04. Here, the video PES processing unit 901 and the audio PES processing unit 902 use the time information that is determined based on the timekeeping mechanism inside the system encoding device, and the time information for decoding and displaying in the input video PES or audio PES, respectively. The resulting video PES
Alternatively, the audio PES is generated by the TS generation unit 903 and the PS generation unit 90.
Enter in 4. The TS generation unit 903 receives the input video P
The TS is generated and output based on the ES, the audio PES, and other data, and the PS generation unit 904 uses the PS based on the input video PES, audio PES, and other data.
Is generated and output.

The system encoding device 8 shown in FIG.
Reference numeral 03 denotes an input of the video PES and the audio PES, but conventionally, there is also a system encoding device that receives the input of the video ES and the audio ES. Figure 1
FIG. 7 is a diagram showing an internal configuration of another conventional system encoding device. As shown in the figure, the system encoding device 806 includes a video ES processing unit 1001, an audio ES processing unit 1002, a video PES processing unit 901, an audio PES processing unit 902, and a TS generation unit 903. Note that FIG.
The same components as those shown in are designated by the same reference numerals. Here, the video ES processing unit 1001 and the audio ES processing unit 1002 respectively input the input video ES or audio E.
A video PES or audio PES is generated and output by adding a stream ID or the like to S and packetizing.

As described above, the conventional system encoding device generally receives an input of video PES, audio PES, etc., or an input of video ES, audio ES, etc., as shown in FIG. 16 or FIG. It is classified as either.

[0009]

In the conventional system encoding apparatus, when data such as video PES is input at a somewhat high transfer rate, the TS at a high transfer rate such that the usable bandwidth on the transmission path of the output destination becomes insufficient. Or P
There is a problem that S is output, and as a result, a FIFO normally provided for adjusting the output transfer rate.
An abnormal situation such as overflow of the buffer may occur, which may cause an adverse effect such as a malfunction of a device that receives transmitted data.

In order to prevent this problem, it is conceivable that the video encoding section for transmitting the video PES to the system encoding apparatus and the audio encoding section for transmitting the audio PES to the system encoding apparatus individually limit the transfer rate to a certain range. This problem cannot be solved properly unless comprehensive restrictions are applied to all of the various data input to the system encoder, and the transmission of each TS and PS that the system encoder outputs to the outside. It is not practical to limit the video band and the audio band in consideration of the band of the road.

Therefore, the present invention has been made in order to solve such a problem on the system encoding device side, and no matter what transfer speed data is input, the usable band in the transmission path of the output destination is An object of the present invention is to provide a system encoding device capable of preventing TS or PS from being output at a high transfer rate that is insufficient.

Incidentally, such a system encoding device is
It can be said that the device has a flexible input interface with respect to the transfer rate of input data. Another object of the present invention is to improve a conventional input interface in which only PES can be input or only ES can be input, and to provide a system encoding device having an input interface that is flexible with respect to the type of input data. .

[0013]

In order to solve the above-mentioned problems, a system encoding apparatus according to the present invention is a system encoding apparatus for generating and outputting output data of a specific format based on input data, Input data acquisition means for acquiring input data to be input, and conversion for sequentially generating output data by performing format conversion processing including one or more processing steps based on the input data acquired by the input data acquisition means Means, output means for outputting the output data generated by the converting means, input speed detecting means for detecting the input speed of the input data acquired by the input data acquiring means, and detection by the input speed detecting means When the input speed exceeds the predetermined standard, one or more processing steps in the format conversion process are performed. Characterized in that it comprises a conversion control means for controlling said converting means so as to locked.

Performing a format conversion process based on input data means, for example, on the basis of input data such as video data and audio data, contents including at least a part of the contents of these input data in a specific format. It means to generate TS etc. expressed in a format. With the above configuration, it is possible to prevent the TS or the PS from being output at a high transfer rate such that the available bandwidth in the transmission path of the output destination becomes insufficient, no matter what transfer speed the data is input. It is possible to prevent in advance an abnormal situation such as overflow of the output FIFO buffer. Note that when the input speed is too high for the usable bandwidth of the output destination, some of the format conversion processing steps are stopped, so there is also an effect of preventing unnecessary power consumption due to execution of unnecessary processing steps. can get.

Further, the system encoding apparatus according to the present invention is a system encoding apparatus which generates and outputs output data of a specific format based on input data, and is either a video PES or a video ES sequentially input. Video acquisition means for acquiring the input data of the type, audio acquisition means for acquiring the input data of any one of the audio PES and the audio ES that are sequentially input, and the input data acquired by the video acquisition means are the video ES. , A sound judging means for judging whether the input data acquired by the sound acquiring means is a sound ES, and a picture PES when the picture ES is input. A video ES processing means for outputting the audio ES, an audio ES processing means for shaping and outputting the audio PES when the audio ES is input, and a video PES. When input, a video PES processing unit that processes and outputs the video PES, a video PES processing unit that processes and outputs the audio PES when the audio PES is input, and a video PES and an audio PES are sequentially input. Then, format conversion processing is performed based on the video PES and the audio PES to sequentially generate output data in at least one of the transport stream and the program stream, and the input data is converted by the video determination means. When it is determined to be the video ES, the input data acquired by the video acquisition means is input to the video ES processing means, and the video PES output from the video ES processing means is input to the output conversion means. However, the input data is video ES by the video determination means.
If it is determined that it is not, the input data acquired by the video acquisition unit is input to the video PES processing unit and output from the video PES processing unit.
When the input data is determined to be the audio ES by the video selection means and the audio determination means, the input data acquired by the audio acquisition means is input to the audio ES processing means. Enter the voice ES
The voice PES output from the processing means is input to the output conversion means, and the input data is voice E by the voice determination means.
If it is determined that the audio PE is not S, the audio PE output from the audio PES processing means by inputting the input data acquired by the audio acquisition means into the audio PES processing means.
It is characterized by comprising a voice selecting means for inputting S to the output converting means, and an output means for outputting the output data generated by the output converting means.

With the above configuration, the system encoding device has a flexible input interface, so that the ISO / IEC13818 is provided to the system encoding device.
If you input either video PES or video ES according to
Alternatively, even if either voice PES or voice ES is input, TS
And PS can be obtained.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a system encoding apparatus according to the present invention will be described below with reference to the drawings. <First Embodiment> FIG. 1 is a functional block diagram of a system encoding apparatus 10 according to the first embodiment.

The system encoding device 10 performs processing such as time division multiplexing on the input video PES, audio PES and other data to convert the format, and
A transport stream (TS) and a program stream (PS) specified in the PEG2 system standard are generated, the TS is output to a network network of a real-time processing system such as digital broadcasting, and the PS is stored in the Internet network. A device for outputting an Internet datagram (hereinafter, referred to as an "IP packet"), which has a function of stopping the format conversion based on the input speed of the input data, in addition to the function of the conventional system encoding device (see FIG. 16). Is also provided. In addition,
The system encoding device 10 is a device that can be arranged in the program encoder 805 instead of the system encoding device 803 shown in FIG.

As shown in FIG. 1, the system encoding apparatus 10 includes an input speed detection unit 101 and a video PES processing unit 1.
02, audio PES processing unit 103, output format conversion unit 104/105, IP conversion unit 106, processing control unit 10
7, output format setting unit 108 and threshold value storage unit 10
9, and also has a clock mechanism, that is, a mechanism for obtaining time information. Each component of the system encoding device 10 is realized by an independent circuit, or a part or all of the components are incorporated in one chip.

Here, the input speed detecting unit 101 uses the separate input interface for the system encoding apparatus 10.
It has a function of detecting the input speed of each of the video PES, the audio PES, and other data input to the above, that is, the bit rate of the input data, and transmitting the individual input speed, which is the input speed of each input data, to the processing control unit 107. The video PES processing unit 102 has a function of processing the input video PES and sending the processed video PES to the output format conversion units 104 and 105. The audio PES processing unit 103 includes the input audio PE.
S is processed to output format conversion units 104 and 1
05 has a function of sending out. The details of this processing are P
Presentation_time_stamp defined in the MPEG2 system standard in ES
(PTS), decoding_time_stamp
A process of correcting the contents of the time information field such as (DTS) so as to match the time information obtained by the system encoding device 10 is included.

The output format setting unit 108 holds information indicating the data formats of TS and PS in association with each output format conversion unit in order to determine the data format of the data string output by each output format conversion unit. This is a memory area. The output format conversion units 104 and 105 set the output format based on the video PES input to the video PES processing unit 102, the audio PES input to the audio PES processing unit 103, and other data that is input data. The output format conversion unit 104 multiplexes input data to generate a TS and outputs the TS to the outside of the system encoding apparatus 10. Converter 1
Reference numeral 05 is for generating a PS and sending it to the IP conversion unit 106.

The IP conversion unit 106 divides the PS transmitted from the output format conversion unit 105 into a start point address,
It has a function of adding an end point address and other information, shaping it into an IP packet, and outputting it to the outside of the system encoding device 10. The TS and IP packets output from the system encoding apparatus 10 to the outside are specifically stored in output first-in first-out (FIFO) buffers in the system encoding apparatus 10, and then the system encoding apparatus 10 is stored. It is output according to the clock given from the network outside.

The threshold storage unit 109 is a memory area for storing input speed threshold information indicating the upper limit of the allowable range for the input speed. Further, the processing control unit 107 determines that the video PES
It has a function of controlling execution and suspension of clock supply to the processing unit 102, the audio PES processing unit 103, and the output format conversion units 104 and 105, and controlling execution of processing of each unit. The processing control unit 107 obtains a total input speed (hereinafter, referred to as "total input speed") by summing the individual input speeds of the respective input data transmitted by the input speed detection unit 101 for these controls. Then, the total input speed is compared with the threshold value in the input speed threshold value information stored in the threshold value storage unit 109, and the comparison is performed according to the comparison result.

The method of detecting the individual input speed by the input speed detecting unit 101 will be described below. FIG. 2 is a diagram showing fields in the video PES representing the input speed. The input video PES is a unique word s
sequence_start_code (0x0000
01B3) is detected and its sequence_star is detected.
Individual input speed expressed as the bit rate when ES is converted into a value obtained by obtaining the value of the 18-bit bit rate field from the 33rd bit after the last bit of t_code and multiplying that value by 400. Becomes

The audio PES that is input is also a video PE.
Similar to S, the individual input rate can be obtained based on the value of a particular field in PES. Specifically, the individual input speed represented by the bit rate when converted to ES is specified by the pattern of the value from the 5th bit to the 4th bit after the AU synchronization pattern (0xFFF). For other data such as video PES and audio PES,
The input speed detection unit 101 obtains an individual input speed by referring to a predetermined field in the data, or directly obtains numerical data indicating the individual input speed from the input source of the data. The individual input speed is detected by this method.

The input speed threshold information stored in the threshold storage unit 109 will be described below. FIG. 3 is a diagram showing an example of the contents of the input speed threshold information. Input speed threshold information 1
90 is composed of a TS output threshold and a PS output threshold.
Here, the TS output threshold is the total input speed of the input data that is the basis of the generation of the TS in order to keep the TS output bit rate within the limit in which the network as the TS output destination can read and process the TS. Is an upper limit value set for. Further, the PS output threshold is set to P when the Internet network or the like which is the output destination of the PS output after being IP packetized.
In order to keep the output bit rate of the IP packet within the limit in which S can be read and processed, the upper limit value is set for the total input speed of the input data that is the basis of PS generation.

The TS output threshold value and the PS output threshold value are set by the designer of the system encoding device or the like in consideration of the amount of change in the data amount in the format conversion. For example, as shown in FIG. It is 0 megabits per second (Mbps) and 5.0 Mbps. Less than,
The operation of the system encoding device 10 having the above-described configuration will be described while focusing on the difference from the conventional system encoding device, that is, the stop control of the format conversion process is performed based on the input speed of the input data.

FIG. 4 is a flowchart showing the stop control operation of the format conversion by the system encoding apparatus 10. When the input speed detection unit 101 detects the individual input speed of each input data and notifies the processing control unit 107 (step S151), the processing control unit 107 sums the individual input speeds to calculate the total input speed ( Step S15
2).

After the total input speed is calculated, the processing controller 1
07 refers to the input speed threshold information, and the total input speed is T
It is determined whether or not it is less than or equal to the S output threshold value (step S15).
3) If the total input speed exceeds the TS output threshold value, a reset signal or the like is issued to the TS output output format conversion unit 104 to stop the processing (step S1).
54), and controls to stop the clock supply to the output format conversion unit 104 (step S155).

If the total input speed is equal to or less than the TS output threshold value in step S153, the processing control unit 107
Refers to the input speed threshold information to determine whether the total input speed is equal to or less than the PS output threshold value (step S156). If the total input speed exceeds the PS output threshold value, P
A reset signal or the like is issued to the output format conversion unit 105 for S output to stop the processing (step S157),
Control is performed to stop the clock supply to the output format conversion unit 105 and the IP conversion unit 106 (step S1).
58).

The procedure after step S151 shown in FIG. 4 is repeatedly executed. Further, each output format conversion unit continues the format conversion unless a stop instruction is given. For example, assuming that the input speed threshold information is as shown in FIG. 3, when the total input speed calculated in step S152 is 4.9 Mbps, the system encoding device 10 causes the IP of the PS generated based on the input data. Packets and TS are output, but if the input speed thereafter increases and the total input speed calculated in step S152 becomes 5.1 Mbps, the total input speed exceeds the threshold for PS output, so the system encoding device 10 stops the format conversion process for PS output and also stops the clock supply to the output format conversion unit 105 and the IP conversion unit 106 to suppress the power consumption thereof, and as a result, outputs only TS.

Therefore, the system encoding device 10
According to this, even when data is input at a speed that is so fast as to lose the balance with the output speed, overflow of the output FIFO buffer and output of abnormal data can be prevented, and unnecessary power consumption can be suppressed. become able to. <Second Preferred Embodiment> A system encoding device 20 according to a second preferred embodiment is a partial modification of the system encoding device 10 shown in the first preferred embodiment. Unlike the device that controls the stop of the format conversion process according to the result compared with the stored threshold value, the output speed requested by the output destination is detected, and the output speed of the total input speed It is a device that obtains a ratio, compares the ratio with a prestored threshold value, and performs control related to the stop of the format conversion process according to the result.

FIG. 5 is a functional block diagram of the system encoding device 20 according to the second embodiment. It should be noted that, of the constituent elements of the system encoding device 20 shown in FIG. 7, constituent elements equivalent to those shown in FIG. 1 in Embodiment 1 are assigned the same reference numerals as those in FIG. A detailed description is omitted. As shown in FIG. 5, the system encoding device 20 includes an input speed detection unit 101, a video PES processing unit 102, an audio PES processing unit 103, an output format conversion unit 104/105, and an IP conversion unit 10.
6, processing control unit 207, output format setting unit 10
8, a threshold value storage unit 209, an output speed detection unit 210, and a speed ratio calculation unit 211, and a mechanism for obtaining time information. The respective constituent elements of the system encoding device 20 are realized by independent circuits, or a part or all of the constituent elements are incorporated in one chip.

Here, the input speed detecting unit 101 calculates the individual input speed, which is the input speed of each input data, from the speed ratio calculating unit 2
11 has the function of communicating. The output speed detector 210 is
TS output from the output format conversion unit 104,
It has a FIFO buffer that temporarily stores each of the PS IP packets output from the IP conversion unit 106, and the TS or IP packets are stored in the FIFO buffer in accordance with the clock given from the network outside the system encoding apparatus 10.
The data is output from the buffer, and has a function of detecting the output speed of each output data and transmitting it to the speed ratio calculation unit 211.

The threshold storage unit 209 is a memory area for storing speed ratio threshold information indicating the upper limit of the allowable range for the ratio of the total input speed to the output speed. Speed ratio calculator 2
11 calculates the total input speed by summing the individual input speeds transmitted from the input speed detection unit 101, and then outputs the TS output speed and the IP packetized PS output transmitted from the output speed detection unit 210. The ratio of the total input speed to each of the speeds is calculated, and the calculated ratio value is used as the processing control unit 2
07 has the function of transmitting.

Further, the processing control unit 207 controls the execution and suspension of clock supply to the video PES processing unit 102, the audio PES processing unit 103, and the output format conversion units 104 and 105, and the control for suppressing the processing execution of each unit. Have the function to do. The processing control unit 207 performs these controls
The ratio value transmitted from the speed ratio calculation unit 211 is compared with the threshold value in the speed ratio threshold information stored in the threshold value storage unit 209, and the comparison is performed according to the comparison result.

The method of detecting the output speed by the output speed detecting unit 210 will be described below. Output speed detector 210
Is a timer counter that operates with a fixed clock, a counter that counts the number of output TS packets,
And a counter for counting the number of bytes of the PS packetized and output. If the timer counter value and the output TS packet number at a certain time point are PCRx and Px, respectively, and the timer counter value and the output TS packet number after a certain time from that time point are PCRy and Py, respectively, two times. After acquiring the timer count value and the number of output TS packets, the TS output speed, that is, the output bit rate TS_R
ate (bps) is calculated by the following equation 1.

[Equation 1] TS_Rate = 8 * (number of bytes of TS packet) * (Py-Px) * (clock cycle value of timer counter) / (PCRy-PCRx) Here, the number of TS packet bytes is 188 bytes or 20
It is 4 bytes, and the clock cycle value of the timer counter can be, for example, 2700000. For PS, since the number of bytes is counted by the counter, P
Output speed of S, output bit rate PS_Rate (bp
s) is calculated by the following equation 2.

[Equation 2] PS_Rate = 8 * (Py-
Px) * (timer counter clock cycle value) / (P
CRy-PCRx) It should be noted that the output speed detection unit 210 uses Px, Py, PCRx.
And the PCRy is obtained and the procedure for obtaining the output speed of each data is repeated, the read speed from the outside such as TS changes with the passage of time in accordance with the change in the status of the transmission path to which the data is sent. Corresponding to, detect the current output speed.

The speed ratio threshold information stored in the threshold storage unit 209 will be described below. FIG. 6 is a diagram showing an example of the content of the speed ratio threshold information. Speed ratio threshold information 290
Consists of a TS output threshold and a PS output threshold. Here, the TS output threshold is the total input speed of the input data,
It is an upper limit value defined for the ratio of the TS to the output speed. The PS output threshold value is an upper limit value defined for the ratio of the total input speed of the input data to the output speed of the PS that is IP-packetized and output.

The TS output threshold value and the PS output threshold value are set by the designer of the system encoding device in consideration of the change in the data amount in the format conversion. For example, as shown in FIG. 0.
It is 85 and 0.90. For example, when the ratio of the total input speed and the output speed of TS is about 0.8, the input / output speed balance is maintained, but when the ratio exceeds 0.85, the input / output speed balance is broken. However, it means that there is an increased risk that correct output cannot be performed due to overflow of the output FIFO buffer.

Hereinafter, the operation of the system encoding device 20 having the above-described configuration will be described, focusing on the point that the stop control of the format conversion process is performed based on the input speed of the input data, which is different from the conventional system encoding device. To do. FIG. 7 is a flowchart showing the stop control operation of the format conversion by the system encoding device 20. In the figure, the same steps as those shown in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

The speed ratio calculation unit 211 includes the input speed detection unit 1
The individual input speed of each input data detected by 01 is acquired (step S151), the individual input speeds are summed to calculate the total input speed (step S152), and the TS detected by the output speed detection unit 210 and The output speed of the IP packetized PS is acquired, and the ratio of the total input speed to each output speed is obtained and transmitted to the processing control unit 207 (step S251).

When each ratio is transmitted, the processing control unit 207 refers to the speed ratio threshold information stored in the threshold storage unit 209 and determines whether the ratio obtained for the TS is less than or equal to the TS output threshold value. If the TS output threshold value is exceeded (step S252), a reset signal or the like is issued to the TS output output format conversion unit 104 to stop the processing (step S154), and the output format conversion unit 10 is executed.
Control is performed to stop the clock supply to No. 4 (step S155).

If the ratio obtained for the TS in step S252 is less than or equal to the TS output threshold, the processing control unit 207 determines whether the ratio is less than or equal to the PS output threshold (step S253). If the ratio exceeds the threshold for PS output, a reset signal or the like is issued to the output format conversion unit 105 for PS output to stop the processing (step S157), and the output format conversion unit 10
5 and control to stop the clock supply to the IP conversion unit 106 (step S158).

The procedure after step S151 shown in FIG. 7 is repeatedly executed. Further, each output format conversion unit continues the format conversion unless a stop instruction is given. Therefore, according to the system encoding device 20, when a situation occurs in which data is input at a speed that is so high that it loses the balance with the output speed at a certain time point, the process causing the abnormality is stopped at that time point.
It is possible to prevent overflow of the output FIFO buffer and output of abnormal data, and further suppress unnecessary power consumption. <Third Embodiment> A system encoding apparatus 30 according to the third embodiment is a partial modification of the system encoding apparatus 20 shown in the second embodiment. The system encoding apparatus 20 stops the format conversion process. Unlike a device that performs such control without distinguishing the type of input data, a priority order is set for the type of input data, that is, the input system type, and control related to stopping the format conversion process is performed according to this priority order. Is a device for performing. That is, when the data is input at an excessive input speed, the system encoding device 30 excludes the input data of the low priority type from the target of the format conversion and performs the format conversion based on the input data of the high priority type. It is a device for performing TS and generating TS and PS.

FIG. 8 is a functional block diagram of the system encoding device 30 according to the third embodiment. It should be noted that, of the constituent elements of the system encoding device 30 shown in the figure, the same constituent elements as those shown in the first or second embodiment are designated by the same reference numerals, and these constituent elements are not described here. Detailed explanation is omitted. As shown in FIG. 8, the system encoding device 30 includes an input speed detection unit 101,
Video PES processing unit 102, audio PES processing unit 103, output format conversion unit 104/105, IP conversion unit 10
6, processing control unit 307, output format setting unit 10
8, a threshold value storage unit 209, an output speed detection unit 210, a speed ratio calculation unit 311, and a priority order storage unit 312, and
It has a mechanism to obtain time information. The respective constituent elements of the system encoding device 30 are realized by independent circuits, or a part or all of the constituent elements are incorporated in one chip.

Here, the input speed detecting unit 101 calculates the individual input speed, which is the input speed of each input data, from the speed ratio calculating unit 3.
11 has the function of communicating. The output speed detector 210 is
TS output from the output format conversion unit 104,
It has a function of detecting each output speed of the PS IP packet output from the IP conversion unit 106 and transmitting it to the speed ratio calculation unit 311.

The priority order storage unit 312 is a memory area for storing priority order information indicating the priority order for each input system type. This priority order is set by the designer of the system encoding device or the like. FIG. 9 is a diagram showing an example of contents of the priority order information. The speed ratio calculation unit 311 obtains the speed ratio threshold information from the processing control unit 307, refers to the priority information, and outputs the output speed detection unit 210 of the total value of the individual input speeds transmitted from the input speed detection unit 101. The ratio of each input speed from each output speed is equal to or less than each threshold, and the maximum number of individual input data for each type of input data is summed from the highest priority, and the total number of input data types is calculated. It has a function of notifying the processing control unit 307.

Further, the processing control unit 307 controls the execution and stop of clock supply to the video PES processing unit 102, the audio PES processing unit 103, and the output format conversion units 104 and 105, and the control for suppressing the processing execution of each unit. It has a function to perform, and obtains the number of types of input data returned from the speed ratio calculation unit 311 by transmitting the speed ratio threshold information to the speed ratio calculation unit 311, and from the higher priority order based on the priority order information. The control is performed so as to suppress the processing for the input data of the types other than the returned number.

Hereinafter, the operation of the system encoding device 30 having the above-described configuration will be described, focusing on the point that the stop control of the format conversion process is performed based on the input speed of the input data, which is different from the conventional system encoding device. To do. FIG. 10 is a flowchart showing the stop control operation of the format conversion by the system encoding device 30. In the figure, the same reference numerals are given to the same steps as those shown in FIG.
Detailed description is omitted here.

The speed ratio calculation unit 311 includes the input speed detection unit 1
Individual input speed of each input data detected by 01,
The output speeds of the TS and PS detected by the output speed detection unit 210 are acquired (steps S151 and S351),
Based on the speed ratio threshold information and the priority order information, the total value of the individual input speeds of the x pieces of input data of each input system type in order from the highest priority order is the TS output threshold value in the ratio to the TS output speed. As described below, the maximum value of x is obtained, and the obtained x is transmitted to the processing control unit 307 (step S352).

Following step S352, the process controller 3
07 refers to the priority information, and x from the highest priority
The data of the input system types other than the data are controlled so as not to be subjected to the format conversion for TS output (step S353). For example, if the priority order information is that illustrated in FIG. 9 and x is found to be 1 by the process of step S352, the process control unit 307 determines that
A signal is sent to the TS output format conversion unit 104 to instruct that only the video is to be processed and that audio and other data are not to be processed. The output format conversion unit 104 is configured to be able to select the data to be the basis of TS generation in accordance with such an instruction.

Further, based on the speed ratio threshold information and the priority order information, the total value of the individual input speeds of the y input data of each input system type in order from the highest priority order is the IP packetized PS. The maximum value of y is calculated so that the ratio of the output speed to the output speed is less than or equal to the PS output threshold, and the calculated y is transmitted to the processing control unit 307 (step S35).
4).

Following step S354, the process control unit 3
07 refers to the priority information, and y is assigned from the highest priority.
The data of the input system types other than the data are controlled so as not to be subject to the format conversion for PS output (step S355). That is, the processing control unit 307 sends a signal to the output format conversion unit 105 for PS, instructing that only the y types of input data from the highest priority are processed and the others are not processed. To do. The output format conversion unit 105 is configured to be able to select the data that is the basis for PS generation in response to such an instruction.

Following step S355, the process control unit 3
Reference numeral 07 denotes a target of format conversion to either TS or PS, that is, if there is a PES processing unit that processes input data of a type that is not the basis of generation, the processing of the PES processing unit is stopped and the PES processing is performed. Control is performed to stop the clock supply to the unit (step S356). The PES processing unit is the video PES processing unit 102 or the audio PES processing unit 103.

Incidentally, step S151 shown in FIG.
The subsequent procedure is repeatedly executed. Further, each output format conversion unit continues the format conversion unless a stop instruction is given. Therefore, according to the system encoding device 30, when the data is input at such a speed that the balance with the output speed is lost, the output FIFO buffer is stopped by stopping the processing of the input data having a low priority. In order to prevent the overflow of data and the output of abnormal data, there is a high possibility that important types of data with high priority can be reliably transmitted. <Fourth Preferred Embodiment> A system encoding device 40 according to a fourth preferred embodiment is a partial modification of the system encoding device 30 shown in the third preferred embodiment. Unlike the device that sets the priority for the input system type and controls the stop of the format conversion process according to this priority, the format conversion process is performed to reflect the most input data type in the output. It is a device that performs control related to stop. That is, the system encoding device 40
Is a device which, when data is input at an excessively high input speed, generates a TS and a PS based on the largest number of types of input data after examining combinations of various types of input data.

FIG. 11 is a functional block diagram of the system encoding device 40 according to the fourth embodiment. It should be noted that, of the components of the system encoding device 40 shown in the figure, the same components as those shown in the first or second embodiment are designated by the same reference numerals, and these components will be described in detail here. The description is omitted. As shown in FIG.
The system encoding device 40 includes an input speed detection unit 10
1, video PES processing unit 102, audio PES processing unit 10
3, an output format conversion unit 104/105, an IP conversion unit 106, a processing control unit 407, an output format setting unit 108, a threshold value storage unit 209, an output speed detection unit 210, a speed ratio calculation unit 411, and an input combination unit 413,
It also has a mechanism for obtaining time information. Each component of the system encoding device 40 is realized by an independent circuit, or a part or all of the components are incorporated in one chip.

Here, the input speed detecting unit 101 calculates the individual input speed, which is the input speed of each input data, from the speed ratio calculating unit 4.
11 has the function of communicating. The output speed detector 210 is
TS output from the output format conversion unit 104,
It has a function of detecting each output speed of the PS IP packet output from the IP conversion unit 106 and transmitting it to the speed ratio calculation unit 411.

The input combination section 413 is a memory area for storing combination information for specifying a combination of input system types. This combination information is set by the designer of the system encoding device, etc. For example, No. 1 is video and audio and other data, No. 2 is video and audio, and No. 3 is video and other data. Information. The speed ratio calculation unit 411 obtains the speed ratio threshold information from the processing control unit 407, refers to the combination information, and outputs the total value of the individual input speeds transmitted from the input speed detection unit 101 from the output speed detection unit 210. The individual input speeds of the input data are summed according to each combination so that the ratio to each output speed transmitted is less than or equal to each threshold, and the combination that maximizes the total number of types of the input data is numbered. It has a function of notifying the processing control unit 307.

Further, the processing control unit 407 controls the execution and stop of clock supply to the video PES processing unit 102, the audio PES processing unit 103, and the output format conversion units 104 and 105, and the control for suppressing the processing execution of each unit. It has a function to perform, obtains the number of the combination returned from the speed ratio calculation unit 411 by transmitting the speed ratio threshold information to the speed ratio calculation unit 411, and inputs the type not included in the combination indicated by the number. The control is performed so as to suppress the processing on the data.

Hereinafter, the operation of the system encoding device 40 having the above-described configuration will be described, focusing on the point that the stop control of the format conversion process is performed based on the input speed of the input data, which is different from the conventional system encoding device. To do. FIG. 12 is a flow chart showing the stop control operation of the format conversion by the system encoding device 40. In the figure, the same steps as those of the processing steps shown in FIG. 4 or FIG.

The speed ratio calculation unit 411 is the input speed detection unit 1
Individual input speed of each input data detected by 01,
The output speeds of the TS and PS detected by the output speed detection unit 210 are acquired (steps S151 and S351),
A combination is selected based on the speed ratio threshold information and the combination information such that the total value of the individual input speeds of the input data of the most input system types is equal to or less than the TS output threshold value in the ratio to the TS output speed. Then, the number corresponding to the combination is transmitted to the processing control unit 407 (step S451). For example, the speed ratio threshold information is as illustrated in FIG. 6, the output speed of TS is 5 Mbps,
Individual input speed of video PES is 4.8 Mbps, audio PE
When the individual input speed of S is 1 Mbps and the individual input speed of other data is 2 Mbps, a combination of the audio PES and other data is selected.

Following step S451, the process control unit 4
07 refers to the combination information, and T for data of the input system type not included in the transmitted combination of numbers.
A signal instructing not to be subject to format conversion for S output is sent to the output format conversion unit 104 (step S452). In addition, the speed ratio calculation unit 411
Based on the speed ratio threshold information and the combination information, the total value of the individual input speeds of the input data of the largest number of input system types should be equal to or less than the PS output threshold value in the ratio of the IP packetized PS output speed. The process control unit 4 selects a combination and assigns a number corresponding to the combination.
07 (step S453).

Following step S453, the process control unit 4
07 refers to the combination information, and P is used for the data of the input system type that is not included in the transmitted combination of numbers.
A signal instructing not to be subject to the format conversion for S output is sent to the output format conversion unit 105 (step S454). Subsequent to step S454, the processing control unit 407, if there is a PES processing unit that processes input data of a type that is not the basis of format conversion into TS or PS, that is, if there is a PES processing unit, that PES processing unit. Processing is stopped and the clock supply to the PES processing unit is controlled to be stopped (step S35).
6). The PES processing unit refers to the video PES processing unit 102 or the audio PES processing unit 103.

Incidentally, step S151 shown in FIG.
The subsequent procedure is repeatedly executed. Further, each output format conversion unit continues the format conversion unless a stop instruction is given. Therefore, according to the system encoding device 40, in the case where the data is input at a speed that is so high that the balance with the output speed is lost, the output F
Even when processing of some types of input data is stopped in order to prevent overflow of the IFO buffer, the number of data types to be stopped can be suppressed to a minimum. <Fifth Preferred Embodiment> A system encoding device 50 according to a fifth preferred embodiment is a partial modification of the system encoding device 40 shown in the fourth preferred embodiment. Voice PES
Unlike an apparatus having an input interface that receives an input of, an apparatus having an input interface that receives either of the video PES and the video ES and the audio PES and the audio ES. That is, the system encoding device 50 is a device in which the degree of freedom of the input data format is expanded.

FIG. 13 is a functional block diagram of the system encoding device 50 according to the fifth embodiment. It should be noted that, of the constituent elements of the system encoding device 50 shown in the figure, constituent elements equivalent to those shown in the first, second, or fourth embodiment are designated by the same reference numerals, and these constituent elements will be described here. Then, detailed description is omitted. As shown in FIG. 13, the system encoding device 50 includes the input speed detection unit 1
01, output format conversion unit 104/105, IP conversion unit 106, processing control unit 407, output format setting unit 108, threshold value storage unit 209, output speed detection unit 210,
Speed ratio calculation unit 411, input combination unit 413, video signal determination unit 514, video PES conversion unit 516, video PES
Processing unit 517, video selection unit 520, audio signal determination unit 51
5, audio PES converter 518, audio PES processor 51
9, a voice selection unit 521 and a determination condition setting unit 522, and a mechanism for obtaining time information. The respective constituent elements of the system encoding device 50 are realized by independent circuits, or a part or all of the constituent elements are incorporated in one chip.

Here, the processing control unit 407 determines that the video PES
Converter 516, video PES processor 517, audio PES
The converter 518, the audio PES processor 519, and the output format converters 104 and 105 have a function of controlling execution and suspension of clock supply, and a function of suppressing processing execution of each unit. By transmitting the ratio threshold value information, the number of the combination returned from the speed ratio calculation unit 411 is obtained, and control is performed so as to suppress the processing on the input data of the type not included in the combination indicated by the number. is there. Note that this suppression control is basically the same as that shown in the fourth embodiment, and the control that is simply performed on the video PES processing unit 102 and the audio PES processing unit 103 is performed by the video PES conversion unit 516. The video PES processing unit 517, the audio PES conversion unit 518, and the audio PES processing unit 519 are only changed.

The determination condition setting section 522 determines the conditions for determining the video PES and the video ES, and the audio PES and the audio E.
This is a memory area for storing a condition for distinguishing between S and S. For this condition, for example, a code that is an ES-specific code that appears in a long cycle, a PES header pattern, and an ES-specific code are detected many times. Information including the number of detections that determines whether to determine ES if the PES header pattern is not detected is used.

The video signal determination unit 514 determines whether the signal input from the video input system is the video PES or the video ES based on the condition stored in the determination condition setting unit 522, and determines. Depending on the result, the video PES converter 5
16 and the video PES processing unit 517 to send a processing start signal to instruct the processing start, and also send an ES detection signal or a PES detection signal to the video selection unit 520 to select the side instructing the processing start. Has the function to instruct.

The video PES conversion unit 516 has a function of generating a video PES based on the input video ES and outputting it to the video selection unit 520 when receiving a processing start instruction from the video signal determination unit 514. Then, the video PES processing unit 517
Has a function of, when receiving a processing start instruction from the video signal determination unit 514, correcting the time information field of the input video PES and outputting it to the video selection unit 520.

The image selection unit 520 is connected to the image signal determination unit 51.
In accordance with the instruction of No. 4, the video PES conversion unit 516 and the video PE
This is a so-called selector having a function of selecting a signal from one of the S processing units 517 and outputting it to the output format conversion units 104 and 105. That is, the image selection unit 520
When the ES detection signal is received, the output signal of the video PES conversion unit 516 is selected, and when the PES detection signal is received, the video processing unit 5 is selected.
17 output signals are selected.

The voice signal determination unit 515 determines whether the signal input from the voice input system is the voice PES or the voice ES based on the condition stored in the determination condition setting unit 522, and determines. Depending on the result, the voice PES converter 5
18 and the audio PES processing unit 519 to send a processing start signal to instruct the processing start, and also send an ES detection signal or a PES detection signal to the audio selection unit 521 to select the side instructing the processing start. Has the function to instruct.

The voice PES conversion section 518 has a function of generating a voice PES based on the input voice ES and outputting it to the voice selection section 521 when receiving a processing start instruction from the voice signal determination section 515. Audio PES processing unit 519
Has a function of, when receiving a processing start instruction from the audio signal determination unit 515, correcting the time information field of the input audio PES and outputting it to the audio selection unit 521.

Further, the audio selection unit 521 selects a signal from one of the audio PES conversion unit 518 and the audio PES processing unit 519 according to the instruction of the audio signal determination unit 515 and outputs it to the output format conversion units 104 and 105. It is a so-called selector that has a function to perform. That is, the voice selection unit 52
1 receives the ES detection signal, the audio PES converter 518
When the PES detection signal is received after selecting the output signal of
The output signal of the ES processing unit 519 is selected.

The video PES processor 517 and the audio P
Specifically, the correction of the time information field by the ES processing unit 519 is “presentation_time_” defined in the MPEG2 system standard in PES.
stamp (PTS), decoding_time_
This is to correct the contents of the time information field such as stamp (DTS) so as to match the time information obtained by the system encoding device 50. Further, the video PES conversion unit 516 and the audio PES conversion unit 518 convert ES into PES having a time information field having contents based on the time information obtained by the system encoding device 50 as a constituent element.

The operation of the system encoding device 50 having the above-described configuration is basically carried out except that the input video signal and audio signal are processed according to the format and then transmitted to the output format conversion section. Form 4
The operation is the same as that of the system encoding device 40 shown in FIG. Therefore, here, whether the input data is ES or PE
The operation of performing different processing depending on whether it is S and transmitting it to the output format conversion unit will be described.

FIG. 14 is a flow chart showing the input video signal determination processing performed by the video signal determination unit 514. As shown in the figure, the video signal determination unit 514 refers to the condition stored in the determination condition setting unit 522, and the Sequence that appears every long cycle in the header pattern of the video ES.
The number of detections n of e_start_code is set (step S551). This n is the size of the payload portion other than the header of the video PES and Sequence_st.
The value is predetermined so that it can be determined whether it is the video PES or the video ES in consideration of the cycle of art_code.

Then, the video signal determination unit 514 compares the input video signal with the header pattern of the video PES defined in advance (step S552). Collation is F
Using the IFO buffer, the input signal stored in the FIFO buffer is a header pattern of the video PES, that is, sequence_start_cod that is a unique word.
e (0x000001B3) is checked to see if it matches.

When a match between the input signal and the header pattern of the video PES is detected by the collation in step S552 (step S553), the video signal determination unit 514 sends the PES detection signal to the video selection unit 520 and the video signal. A processing start signal is sent to the PES processing unit 517 (step S557). In response to this, the video PES processing unit 517
Is processed and the video selection unit 520 sends the result to the output format conversion units 104 and 105.

In the collation in step S552, if no match between the input signal and the header pattern of the video PES is detected, Sequence_start_co.
It is determined whether or not de is detected (step S554), and if detected, it is determined whether or not the number of times of detection has reached n (step S555). It should be noted that the detected number of times is incremented each time the video signal determination unit 514 determines that it has been detected in step S554 using a counter, and the value of the counter is referred to in the determination of step S555.

When the number of times of detection is n in step S555, the video signal determination unit 514 sends the ES detection signal to the video selection unit 520, and the video PE
A processing start signal is sent to the S conversion unit 516 (step S
556). In response to this, the video PES conversion unit 516 shapes the input video ES into a video PES, and the video selection unit 520 outputs the result to the output format conversion units 104 and 1.
Send to 05.

Note that step S554 and step S5
If the determination result in 55 is negative, step S
Returning to 552, the bit pattern of the input signal stored in the FIFO buffer is shifted by 1 bit and collation is performed. That is, the PES header pattern and the Sequence
The collation between _start_code and the input signal is repeated by shifting the input signal by 1 bit.

By this input video signal discrimination processing, when the video ES is input to the system encoding device 50, it is input by the video PES conversion section 516, and when the video PES is input, it is input by the video PES processing section 517, respectively. The video data is processed, etc. and output to the output format conversion units 104 and 105. Regarding the audio signal, Sequence_ in the video signal
Where the start_code is used, the AU synchronization pattern (0xFFF) is used. Depending on whether or not the PES header pattern is detected while the AU synchronization pattern is periodically input for a fixed number of times, the input signal is the voice P.
It is possible to determine whether it is an ES or a voice ES. Therefore, the audio signal determination unit 515 operates according to FIG.

Therefore, this system encoding device 50
In contrast, it becomes possible to obtain TS and PS regardless of whether the video PES or the video ES is input, or the audio PES or the audio ES is input, and the balance with the output speed is obtained. When data is being input at such a high speed that it breaks, the number of data types to be stopped should be kept as small as possible even when processing of input data of some types is stopped to prevent overflow of the output FIFO buffer. Will be able to. <Supplement> The system encoding device according to the present invention has been described above based on the first to fifth embodiments, but it goes without saying that the present invention is not limited to these embodiments. That is, (1) the processing control unit described in the present embodiment controls to stop the clock supply to the video PES processing unit and the like. However, not only the clock supply is stopped but also the power supply is performed by another method. It is good also as performing control which stops. (2) In Embodiments 1 to 4, video PES and audio PE
Although the system encoding device corresponding to the input of S is shown, it is assumed that the input of ES is fixedly received instead of PES, and P is based on ES instead of PES processing unit.
The PES conversion unit that generates the ES (such as the video PES conversion unit 516 in FIG. 13) may be a constituent element. Further, a mechanism capable of processing whichever of PES and ES shown in the fifth embodiment is input may be added to the system encoding device shown in the first to third embodiments. (3) In the present embodiment, a system encoding device having three types of input systems of one video system, one audio system, and one other data system has been shown, but the number of input systems is not limited to this. Instead, for example, two audio systems may be provided. (4) The timing of speed detection by the input speed detection unit described in the first to fifth embodiments and the output speed detection unit described in the second to fifth embodiments may be any cycle. (5) In addition to the combination information shown in the fourth embodiment,
With reference to the input speed of each type of input data, the bit rate when TS is generated based on the input data and the bit rate when PS is generated,
The ratio with respect to the reference may be calculated and included in advance, and in this case, the speed ratio calculation unit obtains the bit rates when TS and PS are generated from the input speed of the input data of each type. Then, the obtained bit rate is used in place of the individual input speed, and step S4 shown in FIG.
The processing of 51 and step S453 may be performed. (6) In the present embodiment, only the control related to the stop of the processing related to the format conversion has been described, but when the stop instruction is not received by the reset signal or the like, the output format conversion unit, the video PES processing unit, or the like. May continue processing related to format conversion, and when the processing control unit does not give an instruction to stop the processing, the processing control unit gives an instruction to execute the processing and controls to supply a clock. The processing regarding format conversion may be continued only while receiving the instruction. (7) Processing procedure of the processing control unit and the like of the system encoding device shown in the present embodiment (FIGS. 4, 7, 10 and 1)
It is also possible to record a computer program for causing a microcomputer to execute the procedure (shown in FIG. 2) on a recording medium or to distribute and distribute the program through various communication paths. Such recording media include ROMs, IC cards, optical disks, flexible disks, and the like. The distributed and distributed computer program is used by being set in the memory of the microcomputer, and the microcomputer executes the computer program to execute the processing procedure shown in this embodiment. Will be able to.

[0086]

As is apparent from the above description, the system encoding device according to the present invention is a system encoding device that generates and outputs output data of a specific format based on input data and is sequentially input. Input data acquisition means for acquiring input data, and conversion means for sequentially generating output data by performing a format conversion process including one or more processing steps based on the input data acquired by the input data acquisition means, Output means for outputting the output data generated by the converting means, input speed detecting means for detecting the input speed of the input data acquired by the input data acquiring means, and input detected by the input speed detecting means When the speed exceeds a predetermined standard, one or more processing steps in the format conversion process are stopped. Characterized in that it comprises a conversion control means for controlling the Hare said converting means.

As a result, regardless of the transfer rate at which data is input, the TS or PS at a high transfer rate such that the usable bandwidth on the output destination transmission line is insufficient.
Can be prevented from being output, and the output FIF
It is possible to prevent occurrence of an abnormal situation such as overflow of the O buffer in advance. Note that when the input speed is too high for the usable bandwidth of the output destination, some of the format conversion processing steps are stopped, so there is also an effect of preventing unnecessary power consumption due to execution of unnecessary processing steps. can get.

Here, the format conversion processing includes a plurality of output conversion processing steps for generating output data of each of a plurality of types of formats by format conversion based on the input data, and the conversion means includes the plurality of output conversion processing steps. A plurality of conversion units for executing each of the output conversion processing steps, the output unit outputs each output data generated by each conversion unit, and the predetermined reference is for each output data format. And the conversion control means compares the input speed detected by the input speed detection means with a predetermined reference for each format, and generates output data in a format in which the input speed exceeds the predetermined reference. The control may be performed by stopping the output conversion processing step by the unit.

As a result, it becomes possible to individually stop the format conversion processing step for the output format for each of TS output and PS output. Further, the input data acquisition unit has a plurality of acquisition units that respectively acquire a plurality of types of input data that are sequentially input, and the input speed detection unit is an individual unit for each input data acquired by each of the acquisition units. The total input speed is detected by calculating the total input speed,
The conversion means may sequentially generate output data based on each input data sequentially acquired by each acquisition unit.

Thus, it is possible to prevent an abnormality from occurring in the transmission path of the output destination regardless of the speed at which each input system such as video, audio and other data is input. Become. Further, the system encoding device may include threshold value storage means for storing a threshold value indicating the predetermined reference, and the conversion control means may perform the control by referring to the threshold value stored in the threshold value storage means. .

Accordingly, if the system designer or the like sets an appropriate threshold value indicating the upper limit of the input speed in the system encoding device, the system encoding device will be able to detect the situation where the input speed exceeds the threshold value. Since a part of the format conversion process is stopped, it is possible to prevent an abnormality from occurring in the output destination of the system encoding device.

In the system encoding device, the output speed detecting means for detecting the output speed of the output data output by the output means, and the input speed detecting means which is a threshold value indicating the predetermined reference are detected. The input speed and the output speed detected by the output speed detection means, a comparison reference value storage means for storing a threshold value serving as a comparison reference, the conversion control means, the input speed, the output speed The control may be performed when the ratio of the output speed detected by the detection means exceeds the threshold value stored in the comparison reference value storage means and the input speed exceeds the predetermined reference.

This makes it possible to cope with the case where the output speed fluctuates with time, and if a situation occurs in which data is input at a speed that is so high as to upset the balance with the output speed at a certain point, an error will occur at that point. It becomes possible to stop the inviting process. Further, the system encoding device includes a priority order storage unit that stores a priority order for each type of the input data, and the format conversion processing includes a plurality of processing units that respectively process the input data acquired by the acquisition units. An input processing step is included, and output data is generated based on the input data processed by the input processing step, and the conversion means is configured to execute a plurality of input processing steps. When the input speed exceeds the predetermined standard, the conversion control means has a processing unit, and when the input speed exceeds the predetermined standard, a total sum of individual input speeds of input data of all types excluding exclusion types does not exceed the predetermined standard. As described above, one or more types of input data are specified as exclusion target types from the lowest priority, and the input data of the specified exclusion target types is specified. Performs the control by stopping the input processing steps by the processing unit in question, it is also possible to produce the output data to said converting means based on the input data other than the excluded types.

As a result, even when the input speed is excessively high with respect to the output speed, it is possible to reliably transmit important types of data having high priority. Further, the format conversion processing includes a plurality of input processing steps for processing the input data acquired by the respective acquisition units, and generates output data based on the input data processed by the input processing steps. The conversion means has a plurality of processing units for performing each of the plurality of input processing steps, and the conversion control means excludes when the input speed exceeds the predetermined reference. Exclude the specified exclusion target type by specifying the minimum number of input data types that is 1 or more as the exclusion target type so that the sum of the individual input speeds for all types of input data excluding the target type does not exceed the predetermined standard. The above-mentioned control is performed by stopping the input processing process by the processing unit for the input data of It is also possible to generate the output data to the serial converter.

As a result, even when the input speed is excessive with respect to the output speed, it is possible to suppress the number of data types to be stopped as much as possible and transmit a large number of types of data within a possible range. In addition, the formats of the output data include a transport stream and a program stream, and the format conversion processing performed by the conversion means is based on the input data or is the input data itself.
The ES may be a process of performing format conversion to generate output data in formats of a transport stream and a program stream.

As a result, when the video PES and audio PES are input to the system encoding device, the MPEG
It becomes possible to obtain TS and PS defined in the two-system standard. Also, the input data acquisition means,
A video acquisition unit for acquiring input data of either type of video PES or video ES, and audio PES of the input data
And an audio acquisition unit that acquires any type of input data of audio ES, and the conversion unit determines whether or not the input data acquired by the image acquisition unit is an image ES. Section, a voice determination section that determines whether the input data acquired by the voice acquisition section is a sound ES, and a video ES processing section that shapes and outputs a video PES when the video ES is input, An audio ES processing unit that shapes and outputs an audio PES when an audio ES is input, and a video P
A video PES processing unit that processes and outputs the video PES when ES is input, an audio PES processing unit that processes and outputs the audio PES when audio PES is input, and input data by the video determination unit. Is determined to be the video ES, the input data acquired by the video acquisition unit is input to the video ES processing unit, and the video PES output from the video ES processing unit is set to the output data. When the input data is determined to be a format conversion target for generation and the input data is not the video ES by the video determination unit, the input data acquired by the video acquisition unit is input to the video PES processing unit and the video is input to the video PES processing unit. The video PES output from the PES processing unit is input by the video selection unit that is the target of the format conversion for generating the output data and the audio determination unit. When it is determined that the data is the audio ES, the audio PES output from the audio ES processing unit when the input data acquired by the audio acquisition unit is input to the audio ES processing unit is set as the output data. When the voice determination unit determines that the input data is not the voice ES, the input data acquired by the voice acquisition unit is input to the voice PES processing unit, and The audio PES output from the audio PES processing unit may include an audio selection unit that is a target of format conversion for generating the output data.

As a result, the system encoding device can have a flexible input interface. Also,
A system encoding device according to the present invention is a system encoding device that generates and outputs output data of a specific format based on input data, and outputs input data of either type of video PES and video ES that are sequentially input. Video acquisition means to be acquired and audio PES that is sequentially input
And an audio acquisition unit that acquires any type of input data of audio ES, a video determination unit that determines whether the input data acquired by the video acquisition unit is a video ES, and the audio acquisition unit. A voice determination unit that determines whether the acquired input data is a voice ES, a video ES processing unit that shapes and outputs a video PES when the video ES is input, and a voice when the audio ES is input. An audio ES processing unit that shapes and outputs the PES, and a video PE that processes and outputs the video PES when the video PES is input.
When the S processing means and the audio PES are input, the audio PE
Video PES processing means for processing and outputting S, and video PE
Output conversion means for sequentially generating output data in at least one of a transport stream and a program stream by performing format conversion processing based on the video PES and audio PES when S and audio PES are sequentially input, When the input data is determined to be the video ES by the video determination unit, the input data acquired by the video acquisition unit is set to the video ES.
When the video PES input to the processing means and output from the video ES processing means is input to the output conversion means and the input data is determined not to be the video ES by the video determination means, the video acquisition means The acquired input data is input to the video PES processing means to input the video PES.
If the input data is determined to be the audio ES by the video selection means for inputting the video PES output from the processing means to the output conversion means, the input acquired by the audio acquisition means. Data is the voice E
When the voice PES input to the S processing means and output from the voice ES processing means is input to the output conversion means, and the input data is determined not to be the voice ES by the voice determination means, the voice acquisition means The input data acquired by the voice PES processing means to the voice PE
It is characterized by comprising a voice selecting means for inputting the voice PES output from the S processing means to the output converting means, and an output means for outputting the output data generated by the output converting means.

As a result, since the system encoding device has a flexible input interface, no matter whether the video PES or the video ES is input, or the audio PES or the audio ES is input to the system encoding device. Even then, it becomes possible to obtain TS and PS.

[Brief description of drawings]

FIG. 1 is a system encoding device 1 according to the first embodiment.
It is a functional block diagram of 0.

FIG. 2 is a diagram showing a field in a video PES representing an input speed.

FIG. 3 is a diagram showing an example of contents of input speed threshold information.

FIG. 4 is a flowchart showing a stop control operation of a format conversion by the system encoding device 10.

FIG. 5 is a system encoding device 2 according to the second embodiment.
It is a functional block diagram of 0.

FIG. 6 is a diagram showing an example of contents of speed ratio threshold information.

FIG. 7 is a flowchart showing a stop control operation of format conversion by the system encoding device 20.

FIG. 8 is a system encoding device 3 according to the third embodiment.
It is a functional block diagram of 0.

FIG. 9 is a diagram showing an example of contents of priority order information.

10 is a flowchart showing a format conversion stop control operation by the system encoding device 30. FIG.

FIG. 11 is a functional configuration diagram of a system encoding device 40 according to a fourth embodiment.

12 is a flowchart showing a format conversion stop control operation by the system encoding device 40. FIG.

FIG. 13 is a functional configuration diagram of a system encoding device 50 according to the fifth embodiment.

FIG. 14 is a flowchart showing an input video signal determination process performed by a video signal determination unit 514.

FIG. 15 is a diagram showing a schematic configuration of a conventional program encoder for converting a video signal and an audio signal into a format for transmission.

FIG. 16 is a diagram showing an internal configuration of a conventional system encoding device 803.

FIG. 17 is a diagram showing an internal configuration of another conventional system encoding device.

[Explanation of symbols]

10, 20, 30, 40, 50 System encoding device 101 Input speed detection unit 102, 517 Video PES processing unit 103, 519 Audio PES processing unit 104, 105 Output format conversion unit 106 IP conversion unit 107, 207, 307, 407 Processing Control unit 108 Output format setting unit 109, 209 Threshold storage unit 210 Output speed detection unit 211, 311, 411 Speed ratio calculation unit 312 Priority storage unit 413 Input combination unit 514 Video signal determination unit 515 Audio signal determination unit 516 Video PES conversion Unit 517 Video processing unit 518 Audio PES conversion unit 520 Video selection unit 521 Audio selection unit 522 Judgment condition setting unit

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Claims (10)

[Claims] 1. A system encoding device for generating and outputting output data of a specific format based on input data, the input data acquiring means for acquiring sequentially input data, and the acquisition by the input data acquiring means. Conversion means for sequentially generating output data by performing a format conversion process including one or more processing steps based on the input data, and output means for outputting the output data generated by the conversion means, An input speed detection means for detecting an input speed of the input data acquired by the input data acquisition means, and one or more processes in the format conversion processing when the input speed detected by the input speed detection means exceeds a predetermined reference. A conversion control means for controlling the conversion means so as to stop the process. Temu encoding apparatus. 2. The format conversion processing includes a plurality of output conversion processing steps for respectively generating output data of a plurality of types of formats by format conversion based on the input data, and the conversion means includes a plurality of the plurality of output conversion processing steps. It has a plurality of conversion units for performing each output conversion processing step, the output unit outputs each output data generated by each conversion unit, the predetermined reference for each format of the output data Yes, the conversion control unit compares the input speed detected by the input speed detection unit with a predetermined reference for each format, and a conversion unit that generates output data in a format in which the input speed exceeds the predetermined reference. 2. The system encoder according to claim 1, wherein the control is performed by stopping the output conversion processing step by the. Apparatus. 3. The input data acquisition unit includes a plurality of acquisition units that respectively acquire a plurality of types of input data that are sequentially input, and the input speed detection unit includes each of the input data acquired by each of the acquisition units. The total input speed is detected by obtaining the sum of the individual input speeds for the conversion means, and the conversion means successively generates output data based on each input data sequentially acquired by each acquisition unit. The system encoding device according to claim 1 or 2. 4. The system encoding device includes a threshold storage unit that stores a threshold value indicating the predetermined reference, and the conversion control unit performs the control by referring to the threshold value stored in the threshold storage unit. 4. The method according to claim 3,
The system encoding device described. 5. The system encoding device includes an output speed detecting means for detecting an output speed of output data output by the output means, and a threshold value indicating the predetermined reference, which is detected by the input speed detecting means. A comparison reference value storage means for storing a threshold value serving as a comparison reference for the ratio of the input speed and the output speed detected by the output speed detection means, wherein the conversion control means is characterized in that the input speed is the output speed. It is characterized in that the control is performed when the input speed exceeds the predetermined reference when the output speed detected by the detection means exceeds the threshold value stored in the comparison reference value storage means. The system encoding device according to claim 3. 6. The system encoding device includes a priority order storage unit that stores a priority order for each type of the input data, and the format conversion process processes the input data acquired by each acquisition unit. A plurality of input processing steps to generate output data based on the input data processed by the input processing step, the conversion means executes each of the plurality of input processing steps. A plurality of processing units, the conversion control means, when the input speed exceeds the predetermined reference, the sum of the individual input speed for all types of input data except the exclusion target type is the predetermined reference In order not to exceed the above, one or more types of input data are specified as exclusion target types from the lowest priority, and the specified exclusion target types are input. The control is performed by stopping the input processing process step by the processing unit for the force data, and the conversion unit generates the output data based on the input data other than the exclusion target type. Item 6. The system encoding device according to any one of items 3 to 5. 7. The format conversion process includes a plurality of input processing steps for processing the input data acquired by each of the acquisition units, and output data based on the input data processed by the input processing step. When the input speed exceeds the predetermined reference, the conversion means has a plurality of processing units for executing each of the plurality of input processing steps. In addition, the type of the minimum number of input data which is 1 or more is specified as the exclusion target type and specified so that the sum of the individual input speeds of the input data of all types except the exclusion target type does not exceed the predetermined standard. The above-described control is performed by stopping the input processing process by the processing unit that targets the input data of the exclusion target type, and the input data other than the exclusion target type is processed. Zui and system encoding apparatus according to any one of claims 3-5, characterized in that to produce the output data to said converting means. 8. The format of the output data includes:
There are a transport stream and a program stream, and the format conversion processing performed by the conversion means is
In the process of converting the format of the video PES (packetized elementary stream) and the audio PES, which are formed based on the input data or are the input data themselves, to generate the output data in the formats of the transport stream and the program stream. The system encoding device according to claim 1, wherein the system encoding device is provided. 9. The input data acquisition means includes a video acquisition unit that acquires input data of any type of video PES and video ES (elementary stream), and one of audio PES and audio ES of the input data. A voice acquisition unit for acquiring input data of the type, the conversion unit is configured to convert the input data acquired by the video acquisition unit into a video ES.
And a video determination unit for determining whether or not the input data acquired by the audio acquisition unit is the audio ES.
An audio determination unit that determines whether or not the video ES, a video ES processing unit that shapes and outputs the video PES when the video ES is input, and a sound that shapes and outputs the audio PES when the audio ES is input An ES processing unit; a video PES processing unit that processes and outputs the video PES when the video PES is input; and an audio PES processing unit that processes and outputs the audio PES when the audio PES is input, When the video determination unit determines that the input data is the video ES, the input PES acquired by the video acquisition unit is input to the video ES processing unit and the video PES output from the video ES processing unit is output. If the input data is not the video ES and is subject to format conversion for generating the output data, it is acquired by the video acquisition unit. The video PES output from the video PES processing unit by inputting the input force data to the video PES processing unit, and the video PES to be subjected to format conversion for generating the output data, and input by the audio determination unit. When it is determined that the data is the audio ES, the audio PES output from the audio ES processing unit when the input data acquired by the audio acquisition unit is input to the audio ES processing unit is set as the output data. When the voice determination unit determines that the input data is not the voice ES, the input data acquired by the voice acquisition unit is input to the voice PES processing unit, and An audio PES output from the audio PES processing unit is provided with an audio selection unit that is a target of format conversion for generating the output data. System encoding apparatus according to claim 8, wherein. 10. A system encoding device for generating and outputting output data of a specific format based on input data, wherein the image acquisition acquires input data of either type of sequentially input video PES and video ES. Means, audio acquisition means for acquiring input data of any type of audio PES and audio ES that are sequentially input, and input data acquired by the video acquisition means is video E
The image determination means for determining whether or not it is S, and the input data acquired by the audio acquisition means are audio E
Audio determination means for determining whether or not it is S, video ES processing means for shaping and outputting the video PES when the video ES is input, and shaping and outputting for the audio PES when the voice ES is input Audio ES processing means; video PES processing means for processing and outputting the video PES when the video PES is input; video PES processing means for processing and outputting the audio PES when the audio PES is input; Output conversion means for sequentially generating output data in at least one of a transport stream and a program stream by performing format conversion processing based on the video PES and audio PES when the video PES and audio PES are sequentially input; When the input data is determined to be the video ES by the video determination unit, the video acquisition unit acquires the input data. When the input data is input to the video ES processing means, the video PES output from the video ES processing means is input to the output conversion means, and the input data is determined not to be the video ES by the video determination means. Includes video selection means for inputting the input data acquired by the video acquisition means to the video PES processing means and inputting the video PES output from the video PES processing means to the output conversion means, and the audio determination. When the input data is determined to be voice ES by the means, the input data acquired by the voice acquisition means is input to the voice ES processing means and the voice PES output from the voice ES processing means is set to the voice PES. If the input data is input to the output conversion means and the input data is determined not to be the voice ES by the voice determination means, the voice acquisition means Audio selection means for inputting the obtained input data to the audio PES processing means and for inputting the audio PES output from the audio PES processing means to the output conversion means, and output data generated by the output conversion means. And an output means for outputting