CN1180623C - Equipment and method of broadcasting digital high sharpness TV code flow from digital universal disk - Google Patents
Equipment and method of broadcasting digital high sharpness TV code flow from digital universal disk Download PDFInfo
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- CN1180623C CN1180623C CNB011268654A CN01126865A CN1180623C CN 1180623 C CN1180623 C CN 1180623C CN B011268654 A CNB011268654 A CN B011268654A CN 01126865 A CN01126865 A CN 01126865A CN 1180623 C CN1180623 C CN 1180623C
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Abstract
The present invention relates to a device for playing a high-definition digital television code stream from a digital universal disk sheet, which comprises a high-density digital optical disk optical driver, a man-machine interface circuit and a decoding circuit, wherein the high-density digital optical disk optical driver is used for driving a high-definition digital television code stream stored in a high-density digital optical disk, the man-machine interface circuit is used for exchanging man-machine information, and the decoding circuit is used for decoding the digital television code stream into a video signal received by a digital television. The present invention is characterized in that the device also comprises a control board circuit which is connected in double way with the man-machine interface circuit and receives a signal sent by the man-machine interface circuit and feeds back the control information of the man-machine interface circuit; the control board circuit is connected in one way with the decoding circuit, sends high definition digital television code stream, and controls the work of the decoding circuit. The present invention relates to a method for realizing the device for playing a high-definition digital television code stream from a digital universal disk sheet, uses a digital disk sheet as a medium to store the high-definition digital television code stream, and realizes the output with uniform rate of the variable rate of the high-definition digital television by a concatenation technology and a frequency synthesis technology.
Description
Technical field
The present invention relates to a kind of storage and broadcast of high definition digital television code stream, relate in particular to a kind of Apparatus and method for of playing the digital high-definition television code stream from universal disc.
Background technology
TV tech has experienced the evolution from the black-and-white TV to the color TV, be at present from simulated television to the development process of Digital Television, digital television program is all formally play in the U.S., Japan and Europe, China also in Beijing, three cities in Shanghai and Shenzhen begin the high definition digital television of piloting.
Meanwhile, each big TV producer also released one after another high-definition TV receiver or digital television that can the receiving high-definition TV programme are given in each emporium.But owing to lack the appropriate signal source, can't show that it is better than the visual effect of common simulation TV, thereby be difficult to cause user's desire to purchase, this has become an obstacle of high definition TV industrialization process, therefore press for a kind of code stream player of high definition digital television, as testing source in the factory and the demonstration signal source in the market.
Compare with the television system of routine, the level of high-definition television image and vertical space resolution all are doubled, and have improved color rendering, and screen width high ratio expanded to 16: 9, and the high-fidelity sound of multichannel is arranged.
Because the amount of information of high definition TV is more than 5 times of existing-quality television system, when transmission, need take the frequency band of broad, when storage, need jumbo storage medium, the code check of high definition TV is generally between 20Mbit/s～30Mbit/s.The speed of high definition digital television code stream is very high, and data volume is very big, and general TS generator can't meet the demands.
Digital storage equipment commonly used mainly contains hard disk and CD-ROM.Because the memory capacity of a CD-ROM has only about 650MB, and data transmission rate is lower, therefore be not suitable for storing high-definition television programs.Therefore, present existing high sharpness TV code flow player is based on industrial computer, and promptly with the memory device of hard disk as high definition TV, storage is in the hard disk of computer, and it not only costs an arm and a leg, and it is all very inconvenient to carry and change programme content.
Emerging high-density digital CD DVD has the memory capacity of 4.4～16GB, is 6.8～25 times of CD-ROM, and the reading speed of high-density digital CD DVD drive is faster more than 4 times than the doubly speed of CD-ROM drive at least.Along with the increase of development of technology and output, the price of high-density digital CD DVD disc and high-density digital CD DVD drive is expected to quickly fall to and CD-ROM disks and the same low level of CD-ROM drive.High-density digital CD DVD will substitute the multimedia storage medium that VCD becomes a kind of main flow.
Summary of the invention
The object of the present invention is to provide a kind of Apparatus and method for of playing the digital high-definition television code stream from universal disc, it adopts high-density digital CD (DVD) storage high definition digital television code stream, control high-density digital CD DVD drive is at the uniform velocity read, after the decoding deck decoding, link to each other with digital television, thus but high resolution displayed TV image.
The object of the present invention is achieved like this:
A kind of equipment from universal disc broadcast digital high-definition television code stream comprises:
One high-density digital CD CD-ROM driver, this CD-ROM driver are used for driving the high definition digital television code stream that the high-density digital CD is stored;
One man-machine interface circuit, this man-machine interface circuit is used for people's machine information is carried out in good time exchange;
One decoding circuit is used for the vision signal that becomes the Digital Television function to receive the high definition digital television code stream decoding;
Be characterized in also comprising:
One control board circuit, this control board circuit are used to realize the control to high-density digital CD CD-ROM driver, read the high definition digital television code stream, and send the high definition digital television code stream and control the work of decoding circuit to decoding circuit;
Described control board circuit and two-way connection of high-density digital CD CD-ROM driver, it receives and reads the digital television code stream from high-density digital CD CD-ROM driver, and high-density digital CD CD-ROM driver is realized control; This control board circuit is connected with the man-machine interface circuit is two-way, and it receives the signal that man-machine interface circuit comes, and feeds back its control information; This control board circuit is connected with decoding circuit is unidirectional, and the control board circuit sends the high definition digital television code stream and controls the work of decoding circuit to decoding circuit;
Described control board circuit comprises:
One push-up storage;
One processor chips circuit, each parts that this processor chips circuit is used for the control board circuit carry out signal controlling and data communication;
One high-density digital CD CD-ROM driver control circuit, this high-density digital CD CD-ROM driver control circuit is arranged on the prime of processor chips circuit, is used for control from high-density digital CD CD-ROM driver sense data, and writes in the push-up storage:
One push-up storage fifo control circuit, this push-up storage fifo control circuit, be arranged on the back level of processor chips circuit, its output is connected with push-up storage, in order to deposit the quantity of data among the control push-up storage FIFO in;
One man-machine interface control circuit, this man-machine interface control circuit are arranged on the back level of processor chips circuit, and it is connected with the man-machine interface circuit;
One direct digital synthesizer circuit, this Direct Digital synthesizer control circuit produce the clock signal of corresponding frequencies according to the requirement of code check;
One output control circuit, the clock signal that data-signal that the data-signal of this output control circuit reception from processor chip circuit and control signal, reception push-up storage are sent here and Direct Digital synthesizer circuit are sent, produce the output video data of parallel interface form according to semaphore request, and deliver to decoding circuit.
A kind of method of playing the digital high-definition television code stream from universal disc, this method adopts the concatenation technology of push-up storage and the method that the Direct Digital complex art realizes at the uniform velocity playing with high-density digital CD CD-ROM drive various code rate high definition code stream, is characterized in may further comprise the steps:
Step 1, processor chips circuit are according to the high sharpness TV code flow information of storing on the high-density digital optical disk, and control Direct Digital synthesizer is exported the corresponding clock frequency,
Step 2, processor chips circuit are controlled sense data from high-density digital CD CD-ROM driver, and are write in the push-up storage according to the information or the instruction of the man-machine interface that is received,
Step 3, push-up storage is counted data, and when the data volume in the push-up storage surpassed certain value M1, the processor chips circuit began the clock frequency that produces with the Direct Digital synthesizer, output digital video code stream at the uniform velocity,
Step 4, when the remaining space in the push-up storage during less than B*2KB, the processor chips circuit stops to send out read command to the high-density digital CD drive,
Step 5 when the data volume in the push-up storage during less than S1, starts a new read command,
Step 6, when overflow or underflow appear in push-up storage, explanation makes mistakes.
Above-mentioned playing the method for digital high-definition television code stream from universal disc, wherein, in described step 2, sense data from high-density digital CD CD-ROM driver, the calculation procedure of the highest code check fmax of the high definition television video code stream that can play is:
The first, set the sector length B that increases every read command reading of data, with the data output rating of raising high-density digital CD CD-ROM driver,
The second, when the sector length B of reading of data was enough big, t2 shared the time of each direct memory access and can ignore, and the highest code check fmax depends primarily on t1; At this moment,
The data (byte) that the each direct memory access of the highest code check fmax=reads/(direct memory access used time+t1)
＝32KB/(2+6)ms
＝4MB/s。
Above-mentioned playing the method for digital high-definition television code stream from universal disc, wherein, also comprise the step of calculating push-up storage S between described step 4 and step 5, the calculation procedure of the suitable big or small S of described calculating push-up storage is:
The first, calculate t2 does not have situation that data write, will keep reading with constant rate of speed f in the time under the data volume S1 that must preserve at least in advance in the push-up storage;
The second, S1=f*t2
＝4MB/s*40ms＝160KB
Data volume in push-up storage is lower than before the S1, must send next bar read command;
The 3rd, calculate the sector length B that reads in every read command, keep constant output speed f, must be with higher speed reading video data from high-density digital CD CD-ROM driver, so sector length B must require to be enough greatly
(B*2K byte)/(finish one read the order of B sector data used time+t2)＞f
Before sending a new order, the spatial capacity in the push-up storage must be greater than the B*2K byte;
Can obtain the capacity S:S＞S1+B*2K byte of push-up storage thus.
Above-mentioned playing the method for digital high-definition television code stream from universal disc, wherein, described step 2 also comprises:
(1) according to the quantity of data in the push-up storage, whether sends the read data order with Single-chip Controlling;
(2) read the order of the data of specifying original position and length in the direct memory access mode, the startup of electricity consumption programmable logic device control direct memory access process, carry out and stop.
The present invention plays the Apparatus and method for of digital high-definition television code stream from universal disc, owing to adopted above-mentioned technical scheme, makes it compared with prior art, has following advantage and good effect:
1. the present invention is because equipment divorced from computer hard disk, developed the control circuit of special-purpose high-density digital CD CD-ROM driver, and push-up storage FIFO concatenation technology and Direct Digital synthesizer DDS frequency synthesis technique have been adopted, therefore, can at the uniform velocity play the high definition digital television code stream of various code rate adaptively, and the television video of output high definition after decoding is to satisfy the requirement of Digital Television development;
2. the present invention is owing to also carried out the storage that realizes a plurality of high definition digital television programs and the management of broadcast in equipment, for conveniently using of people provides man-machine interface, therefore, people can show the directory content of high-density digital CD DVD disc on LCDs, and can select programme content and the broadcast mode that will play by the button user;
3. the present invention is owing to designed special-purpose high-density digital CD CD-ROM driver DVD control circuit, by the IDE ide interface, realize control with single-chip microcomputer and electrically programmable logical device EPLD to high-density digital CD DVD drive, therefore, this equipment high-density digital optic disk HD digital TV code flow playback equipment is the volume of reduction equipment significantly, and have be easy to carry, stable performance, easy to use and cheap advantage;
4. the present invention makes it also have following characteristics owing to use high-density digital CD DVD disk storage high definition digital television code stream:
1. high-density digital CD DVD disc has replacing, easy to carry;
2. the capacity of a high-density digital CD DVD disc is up to 4.7G, can deposit the high definition digital television code stream that reaches 25-30 minute, along with the more release of high power capacity high-density digital CD DVD disc (as the 9.4G that has of new release), can deposit the high definition code stream of longer time;
3. existing high-density digital CD DVD drive great majority are supported Ultra direct memory access 1 data transfer mode, the highest access rate of data reaches 33MByte/s, read the reading rate that on average can reach 4Mbyte/s (32Mbit/s) continuously, can satisfy the requirement of the high code check of high definition digital television code stream.
Description of drawings
Fig. 1 plays the overall frame structure schematic diagram of the equipment of digital high-definition television code stream according to what the present invention proposed from universal disc;
Fig. 2 is the frame structure schematic diagram of control board circuit among Fig. 1;
Fig. 3 is the present invention's main program control flow chart from the equipment of universal disc broadcast digital high-definition television code stream;
Fig. 4 is the present invention's interrupt handling routine control flow chart from the equipment of universal disc broadcast digital high-definition television code stream.
Embodiment
See also shown in Figure 1ly, to be the present invention play the schematic diagram of primary structure of the equipment of digital high-definition television code stream from universal disc for this.The present invention plays the equipment of digital high-definition television code stream from universal disc, and it comprises: a high-density digital CD CD-ROM driver DVD 200, and this CD-ROM driver 200 is used for driving the high definition digital television code stream of the storage of high-density digital CD; One man-machine interface circuit 300, this man-machine interface circuit 300 is used for people's machine information is carried out in good time exchange; One decoding circuit 400 is used for the vision signal that becomes the Digital Television function to receive the high definition digital television code stream decoding; Main feature of the present invention is, also comprises a control board circuit 100, and this control board circuit 100 is used to realize the control to high-density digital CD CD-ROM driver DVD200, and reads the high definition digital television code stream; Described control board circuit 100 with the annexation of above-mentioned each parts is, this control board circuit 100 and high-density digital CD CD-ROM driver high-density digital two-way connection of CD DVD200, control board circuit 100 receives and reads the digital television code stream from high-density digital CD CD-ROM driver DVD 200, and CD-ROM driver high-density digital CD DVD 200 is realized control; This control board circuit 100 and 300 two-way connections of man-machine interface circuit, control board circuit 100 receives the signal of man-machine interface circuit 300, and feeds back its control information signal; This control board circuit 100 is carried out unidirectional the connection with decoding circuit 400, and control board circuit 100 sends the high definition digital television code stream to decoding circuit 400, and the work of control decoding circuit 400.
Among Fig. 1,
Expression: data flow
Expression: control flows
As can be known above-mentioned, the present invention has broken away from former hard disc of computer system, developed the control circuit of special-purpose high-density digital CD DVD driver, adopt multistage big capacity push-up storage FIFO concatenation technology and Direct Digital synthesizer DDS frequency synthesis technique, so can at the uniform velocity play the high definition digital television code stream of various code rate adaptively, output high definition television video after decoding; And, the present invention has also carried out the storage of TV programme and has play management, the man-machine interface of providing convenience makes people can show the directory content of high-density digital CD DVD disc on LCDs, can select programme content and the broadcast mode that will play by the button user.
Please in conjunction with Fig. 1 referring to shown in Figure 2, Fig. 2 is the frame structure schematic diagram of control board circuit among Fig. 1.Control board circuit 100 among the present invention comprises:
One push-up storage FIFO 140;
One processor chips circuit 110, this processor chips circuit 110 are used for each parts of control board circuit 100 are carried out signal controlling and data communication;
One high-density digital CD CD-ROM driver DVD control circuit 120, this DVD control circuit 120 is arranged on the prime of processor chips circuit 110, be used for control from high-density digital CD CD-ROM driver DVD 200 sense datas, and write among the push-up storage FIFO 140; And whether the quantity according to data among the push-up storage FIFO sends the read data order with Single-chip Controlling; Read the order of the data of specifying original position and length then in the mode of Ultra direct memory access, the startup of electricity consumption programmable logic device EPLD control direct memory access process, carry out and stop;
One push-up storage fifo control circuit 130, this push-up storage fifo control circuit 130 is arranged on the back level of processor chips circuit 110, its output is connected with push-up storage FIFO 140, in order to deposit the quantity of data among the control push-up storage FIFO 140 in; This push-up storage fifo control circuit 130 is counted the data among each dynamic push-up storage FIFO by electricity consumption programmable logic device EPLD, produce a half-full signal, the read-write of control high-density digital CD DVD driver, make neither overflow of push-up storage FIFO, also underflow not guarantees the continuity of data;
One man-machine interface control circuit 150, this man-machine interface control circuit 150 are arranged on the back level of processor chips circuit 110, and are connected with machine interface circuit 300;
One direct digital synthesizer DDS circuit 160, this Direct Digital synthesizer DDS control circuit 160 can produce corresponding output frequency adaptively according to the variation of high definition digital television code check, the clock signal that control Direct Digital synthesizer DDS control circuit 160 produces corresponding frequencies is delivered to an output control circuit 170, and it is less than 1Hz that its code check is adjusted precision;
Above-mentioned output control circuit 170 is connected with push-up storage FIFO 140 with processor chips circuit 110; 170 pairs of high definition digital television data of reading from high-density digital CD DVD drive of output control circuit are handled, in order to produce the output video data of parallel interface SPI form according to semaphore request; It is with constant rate of speed reading of data and output from push-up storage FIFO, from the data of reading, handle and produce corresponding SYNC and VALID signal, TTL and LVDS promptly are provided two kinds of way of outputs, thereby, and deliver to decoding circuit 400 with signal parallel interface SPI form output video data.
The present invention, play the equipment of digital high-definition television code stream from universal disc, its originality adopts multistage jumbo push-up storage FIFO concatenation technology, realize the output of high definition television video code stream constant code rate, the highest continuously average reading speed of code stream playback equipment is more than 25.7Mbits/s.
High definition digital television is supported different rank and class, has different data bit rates, for the video code flow of certain code check, must be with the constant rate of speed output of this code check, otherwise can cause decoded picture discontinuous, even cause the decoder can't operate as normal.In order to meet this requirement, the present invention has adopted multistage big capacity push-up storage FIFO cascade technology and Direct Digital synthesizer DDS frequency synthesis technique.
Select push-up storage FIFO to be to determine the size of push-up storage FIFO as the buffer key, it depends on the maximum starting time of high-density digital CD DVD drive reading of data.
Support the high-density digital CD DVD drive of Ultra direct memory access 1, the highest reading rate can reach 33MByte/s, but when high-density digital CD DVD R is read continuously, Mean Speed only has 4Mbyte/s, when high-density digital CD DVD ROM was read continuously, Mean Speed was 8Mbyte/s, and this is because when changing session, seek time is longer, and the direct memory access process can be suspended.For example for an order of reading B=128 sector in the direct memory access mode, high-density digital CD DVD drive is after the data that read 16 sectors (32K byte) on the same session, pause t1 after the time (concrete numerical value is relevant with the high-density digital CD DVD drive of selecting for use), just can start direct memory access operation next time, this is main because the action of high-density digital CD DVD drive read/write head has little time.And after an order finished, when sending next command, high-density digital CD DVD drive will arrive t2 could start direct memory access after the time.The highest code check fmax of the high sharpness TV code flow that this equipment can be play, relevant with t1 and t2.Increase the sector length B of every read command reading of data, can improve the data output rating of high-density digital CD DVD drive, when B is enough big, t2 shares the time of each direct memory access and can ignore, fmax depends primarily on t1, but this means the capacity S that will increase push-up storage FIFO.
For this reason, the present invention, a kind of method of playing the equipment of digital high-definition television code stream from universal disc, in the present invention, this method adopts the concatenation technology of push-up storage FIFO and the equipment that the comprehensive DDS technology of Direct Digital realizes at the uniform velocity playing with high-density digital CD DVD drive multiple digital high-definition television code stream, and the inventive method may further comprise the steps:
Step 1, processor chips circuit are according to the high sharpness TV code flow information of storing on the high-density digital optical disk, and control Direct Digital synthesizer is exported the corresponding clock frequency;
Step 2, processor chips circuit are controlled sense data from high-density digital CD CD-ROM driver, and are write in the push-up storage according to the information or the instruction of the man-machine interface that is received; Wherein,
The calculation procedure of the highest code check fmax of the high definition television video code stream that can play is:
The first, set the sector length B that increases every read command reading of data, with the data output rating of raising high-density digital CD CD-ROM driver,
The second, when the sector length B of reading of data was enough big, t2 shared the time of each direct memory access and can ignore, and the highest code check fmax depends primarily on t1; At this moment,
The data (byte) that the each direct memory access of the highest code check fmax=reads/(direct memory access used time+t1)
＝32KB/(2+6)ms
＝4MB/s；
In step 2, also comprise:
(1) according to the quantity of data among the push-up storage FIFO, whether sends the read data order with Single-chip Controlling;
(2) read the order of the data of specifying original position and length with direct memory access mode UltraDMA1, the startup of electricity consumption programmable logic device EPLD control direct memory access process, carry out and stop;
Step 3, push-up storage is counted data, and when the data volume in the push-up storage surpassed certain value M1, the processor chips circuit began the clock frequency with the generation of Direct Digital synthesizer, at the uniform velocity output digital video code stream;
Step 4, when the remaining space in the push-up storage during less than B*2KB, the processor chips circuit stops to send out read command to the high-density digital CD drive;
Step 5 when the data volume in the push-up storage during less than S1, starts a new read command;
Step 6, when overflow or underflow appear in push-up storage, explanation makes mistakes.
Also comprise the step of calculating push-up storage S between above-mentioned step 4 and step 5, the calculation procedure of the suitable big or small S of described calculating push-up storage is:
The first, calculate t2 does not have situation that data write, will keep reading with constant rate of speed f in the time under the data volume S1 that must preserve at least in advance in the push-up storage;
The second, S1=f*t2
＝4MB/s*40ms＝160KB
Data volume in push-up storage is lower than before the S1, must send next bar read command;
The 3rd, calculate the sector length B that reads in every read command, keep constant output speed f, must be with higher speed reading video data from high-density digital CD CD-ROM driver, so sector length B must require to be enough greatly
(B*2K byte)/(finish one read the order of B sector data used time+t2)＞f
Before sending a new order, the spatial capacity in the push-up storage must be greater than the B*2K byte;
Can obtain the capacity S:S＞S1+B*2K byte of push-up storage thus.
See also shown in Figure 3ly, to be the present invention play main program control flow chart the equipment of digital high-definition television code stream from universal disc to Fig. 3.Its main program is:
Main program is after resetting to the each several part circuit, and whether in CD-ROM driver have disc, if disc is arranged in the CD-ROM driver, then continue follow-up operation, otherwise report an error if at first checking; Then, from disc, read the directory information of code stream, comprise title, speed and the memory location of program sum, each segment encode stream, and Direct Digital synthesizer DDS is set in view of the above and shows disc the rendition list; Then, the selection according to the user begins to play corresponding programme content;
Main program is constantly checked the capacity of push-up storage FIFO and the state of high-density digital CD drive DVD drive, and whether decision sends next bar read command in view of the above; The address of read command is revised by interrupt handling routine.
See also shown in Figure 4ly, to be the present invention play interrupt handling routine control flow chart the equipment of digital high-definition television code stream from universal disc to Fig. 4.Its interrupt handling routine is:
Interrupt handling routine is finished two functions, and the one, handle interruption from high-density digital CD drive DVD drive, judge whether a last read command completes successfully, and revise the initial address of a read command in view of the above; Another is the interruption of handling from the man-machine interface of front panel, does corresponding processing according to user command.
In sum, the present invention proposes to adopt cheapness, portable high-density digital CD DVD disc as medium memory high definition television video code stream first, designed special hardware control, by IDE ide interface control high-density digital CD DVD drive readout code flow data, and propose to utilize push-up storage FIFO concatenation technology and Direct Digital synthesizer DDS frequency synthesis technique originally, realize the at the uniform velocity output of the variable bit rate of high definition digital television; This equipment is small-sized, reliable, and has price advantage, and the TS generator of alternative existing high definition television video code stream is widely used in the market as the signal source of high definition digital television machine displaying and the testing source in the factory; Its appearance enters into thousand families to high definition digital television and becomes the family to play certain impetus.
Claims (5)
1. play the equipment of digital high-definition television code stream from universal disc for one kind, comprising:
One high-density digital CD CD-ROM driver (200), this CD-ROM driver (200) are used for driving the high definition digital television code stream that the high-density digital CD is stored;
One man-machine interface circuit (300), this man-machine interface circuit (300) is used for people's machine information is carried out in good time exchange;
One decoding circuit (400) is used for the vision signal that becomes the Digital Television function to receive the high definition digital television code stream decoding;
It is characterized in that also comprising:
One control board circuit (100), this control board circuit (100) is used for the control of realization to high-density digital CD CD-ROM driver (200), read the high definition digital television code stream, and send the high definition digital television code stream and control the work of decoding circuit (400) to decoding circuit (400);
Described control board circuit (100) and two-way connection of high-density digital CD CD-ROM driver (200), it receives and reads the digital television code stream from high-density digital CD CD-ROM driver (200), and high-density digital CD CD-ROM driver (200) is realized control; This control board circuit (100) and two-way connection of man-machine interface circuit (300), it receives the signal that man-machine interface circuit (300) comes, and feeds back its control information; This control board circuit (100) and unidirectional connection of decoding circuit (400), control board circuit (100) sends the high definition digital television code stream and controls the work of decoding circuit (400) to decoding circuit (400);
Described control board circuit (100) comprising:
One push-up storage (140);
One processor chips circuit (110), each parts that this processor chips circuit (110) is used for control board circuit (100) carry out signal controlling and data communication;
One high-density digital CD CD-ROM driver control circuit (120), this high-density digital CD CD-ROM driver control circuit (120) is arranged on the prime of processor chips circuit (110), be used for control from high-density digital CD CD-ROM driver (200) sense data, and write in the push-up storage (140):
One push-up storage (FIFO) control circuit (130), this push-up storage (FIFO) control circuit (130), be arranged on the back level of processor chips circuit (110), its output is connected with push-up storage (140), in order to deposit the quantity of data in the control push-up storage (FIFO) (140) in;
One man-machine interface control circuit (150), this man-machine interface control circuit (150) are arranged on the back level of processor chips circuit (110), and it is connected with man-machine interface circuit (300);
One direct digital synthesizer circuit (160), this Direct Digital synthesizer control circuit (160) produce the clock signal of corresponding frequencies according to the requirement of code check;
One output control circuit (170), the clock signal that data-signal that the data-signal of this output control circuit (170) reception from processor chip circuit (110) and control signal, reception push-up storage (140) are sent here and Direct Digital synthesizer circuit (160) are sent, produce the output video data of parallel interface form according to semaphore request, and deliver to decoding circuit (400).
2. play the method for digital high-definition television code stream from universal disc for one kind, it is characterized in that may further comprise the steps:
Step 1, processor chips circuit are according to the high sharpness TV code flow information of storing on the high-density digital optical disk, and control Direct Digital synthesizer is exported the corresponding clock frequency,
Step 2, processor chips circuit are controlled sense data from high-density digital CD CD-ROM driver, and are write in the push-up storage according to the information or the instruction of the man-machine interface that is received,
Step 3, push-up storage is counted data, and when the data volume in the push-up storage surpassed certain value M1, the processor chips circuit began the clock frequency that produces with the Direct Digital synthesizer, output digital video code stream at the uniform velocity,
Step 4, when the remaining space in the push-up storage during less than B*2KB, the processor chips circuit stops to send out read command to the high-density digital CD drive,
Step 5 when the data volume in the push-up storage during less than S1, starts a new read command,
Step 6, when overflow or underflow appear in push-up storage, explanation makes mistakes.
3. the method for playing the digital high-definition television code stream from universal disc as claimed in claim 2, it is characterized in that: in described step 2, sense data from high-density digital CD CD-ROM driver, the calculation procedure of the highest code check fmax of the high definition television video code stream that wherein, can play is:
The first, set the sector length B that increases every read command reading of data, with the data output rating of raising high-density digital CD CD-ROM driver,
The second, when the sector length B of reading of data was enough big, t2 shared the time of each direct memory access and can ignore, and the highest code check fmax depends primarily on t1; At this moment,
The data (byte) that the each direct memory access of the highest code check fmax=reads/(direct memory access used time+t1)
＝32KB/(2+6)ms
＝4MB/s。
4. the method for playing the digital high-definition television code stream from universal disc as claimed in claim 2, it is characterized in that: also comprise the step of calculating push-up storage S between described step 4 and step 5, the calculation procedure of the suitable big or small S of described calculating push-up storage is:
The first, calculate t2 does not have situation that data write, will keep reading with constant rate of speed f in the time under the data volume S1 that must preserve at least in advance in the push-up storage;
The second, S1=f*t2
＝4MB/s*40ms＝160KB
Data volume in push-up storage is lower than before the S1, must send next bar read command;
The 3rd, calculate the sector length B that reads in every read command, keep constant output speed f, must be with higher speed reading video data from high-density digital CD CD-ROM driver, so sector length B must require to be enough greatly
(B*2K byte)/(finish one read the order of B sector data used time+t2)＞f
Before sending a new order, the spatial capacity in the push-up storage must be greater than the B*2K byte;
Can obtain the capacity S:S＞S1+B*2K byte of push-up storage thus.
5. the method from universal disc broadcast digital high-definition television code stream as claimed in claim 2, it is characterized in that: described step 2 also comprises:
(1) according to the quantity of data in the push-up storage, whether sends the read data order with Single-chip Controlling;
(2) read the order of the data of specifying original position and length in the direct memory access mode, the startup of electricity consumption programmable logic device control direct memory access process, carry out and stop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011268654A CN1180623C (en) | 2001-09-26 | 2001-09-26 | Equipment and method of broadcasting digital high sharpness TV code flow from digital universal disk |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011268654A CN1180623C (en) | 2001-09-26 | 2001-09-26 | Equipment and method of broadcasting digital high sharpness TV code flow from digital universal disk |
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| Publication Number | Publication Date |
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| CN1411274A CN1411274A (en) | 2003-04-16 |
| CN1180623C true CN1180623C (en) | 2004-12-15 |
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| CNB011268654A Expired - Fee Related CN1180623C (en) | 2001-09-26 | 2001-09-26 | Equipment and method of broadcasting digital high sharpness TV code flow from digital universal disk |
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| CN100391231C (en) * | 2005-12-06 | 2008-05-28 | 海信集团有限公司 | Domestic terminal apparatus capable of realizing flow medium data high speed transmission |
| CN111954048B (en) * | 2020-08-21 | 2021-12-17 | 四川长虹电器股份有限公司 | Method for playing high-bit-rate video resource, terminal equipment and storage medium |
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