CN1258290C - Method for determined broadcasting data rate for equipment with digital interface - Google Patents

Abstract

To provide a method for determining the broadcast transfer rate of equipment having the digital interface of IEEE 1394 or the like. Concerning the method for determining the transfer rate at the time of setting a broadcast-out connection by using certain equipment in a network system mutually connecting a plurality of pieces of equipment through the digital interface, this method is provided with a step for certain equipment as mentioned above to check the compatibility between a signal format to be outputted by that equipment itself and a signal format corresponding to each of equipment connected to the said network system and to detect the maximum transfer rate to be supported by each of equipment as mentioned above when the presence of compatibility is judged and a step for determining the minimum value between the maximum rate to be supported by certain equipment as mentioned above and the maximum transfer rate detected by the above step as the transfer rate of broadcast-out connection of certain equipment.

Description

Determine to have the method for broadcasting data rate of the equipment of digital interface

The present invention relates to connection management method, particularly have definite method of the broadcasting data rate of digital interface such as IEEE1394 interface equipment by the digital interface between a plurality of digital devices.

At present, developed various digital devices, as: Digital Television, digital VCR, top box of digital machine or the like.Introduced the interface standard of these digital devices, as the IEEE1394 standard.The IEEE1394 standard is included among " IEEE1394-1955, High Performance Serial Bus (ieee standard publishing house, December nineteen ninety-five) ".

In addition, in the system that interconnects by digital interface such as IEEE1394 interface, connect by the synchronous bit stream between a plurality of digital devices of IEC61883 standardized administration.Described IEC61883 standard be included in " the digital interface standard of electronic audio frequency/video equipment, (and the digital VCR meeting of high definition (HD), December nineteen ninety-five, first) " or the like among.

The ICE61883 normalized definition be used as the input plug and the output plug of bit stream input and output device in each digital device.The input and output plug respectively by input main plug register (iMPR), input plug control register (iPCR), export the control of main plug register (oMPR), output plug control register (oPCR).Each digital device connects by the control register management relevant with the input and output plug.As shown in Figure 1, oPCR has online district, broadcasting counter district, point-to-point counter district, reserved area, channel designator district, data rate district, overhead (overhead) ID district, pay(useful) load district.As shown in Figure 2, oMPR has data rate capacity district, broadcast channel base (base) district, expansion area 1, expansion area 2, reserved area and output plug sequence number district.

Connect in the type at multiple digital device, have point-to-point to connect and the broadcasting connection.In the point-to-point of being made up of the channel between output plug, input plug and these plugs connect, connection can be set up/be covered to any digital device.These can disconnect connection after having set up the equipment that connects, thereby can discharge the resource (channel, bandwidth) that connection takies.Broadcasting connects to be divided into broadcasts input connection and broadcasting output connection.Broadcasting input connection is tied input plug and channel, and broadcasting is exported to connect output plug and channel are tied.The equipment that connects actual input and output bit stream by broadcasting can be set up the broadcasting connection.Equipment in the network can disconnect and discharge connection.At this moment, use iMPR, iPCR, oMPR and oPCR register can be finished and comprise that foundation and releasing point-to-point connect and broadcasting is bound up on all interior management roles.The purpose that the equipment of wanting to be assigned to resource or wanting to discharge resource is communicated by letter with the synchronization of all network asset management device and is assigned to resource or discharges resource to reach.

With reference to figure 3, the source device in the system, i.e. set-top box (STB) 110 and receive (sink) equipment, promptly Digital Television (DTV) connects by the IEEE1394 cable.As shown in Figure 1, for two or more digital devices that interconnect, to comprise the data communication of image, set up broadcasting and connect between these equipment, promptly synchronous data transmission connects.That is to say that when the broadcasting output of having set up certain channel as STB110 connects, and the DTV120 broadcasting input of having set up this channel is when connecting, view data transmits between STB110 and DTV120 as media with this channel.Here, be used to broadcast the system resource of connection, promptly channel and bandwidth must be distributed to each digital device.Give sequence number of channel allocation, and bandwidth is by signal format, data rate and information decision that some are additional.Here, data rate has the greatest impact to required amount of bandwidth.Because when data rate approximately doubles, the bandwidth that is assigned to reduces by half, thus must be arranged on maximum to data rate, to effectively utilize the bandwidth of whole network system.Thereby in point-to-point connects, can obtain the maximum data rate that two equipment are supported.Under the contrast, in broadcasting output connects, the minimum data rate (as the 100Mbps data rate of IEEE1394) that uses all devices to support.For example, having set up broadcasting output when first equipment connects, second equipment has set up that the broadcasting input connects so that carry out bit stream when communicating by letter with first equipment, first equipment is supported the 200Mbps data rate, second equipment is supported the 400Mbps data rate, in the network system that connects by the IEEE1394 standard, for the 200Mbps data rate, in fact, needing only the 150Mbps data rate has communicated by letter with regard to enough carrying out bit stream.But, connect because first equipment is set up broadcasting output with the 100Mbps data rate, so be assigned to about 300MHz bandwidth.Therefore, owing to bandwidth changes according to data rate, the bandwidth of whole network just is not utilized effectively, and this is a problem in the former technology.Also have, existing digital interface standard such as IEEE1394 do not define the data rate that broadcasting output connects.

For addressing the above problem, purpose of the present invention just provides a kind of definite method of broadcasting data rate, wherein, by an equipment in the system of a plurality of equipment of digital interface connecting, whether support this equipment to want to send to the signal format of another equipment that communicates with by checking, determine the data rate that its broadcasting output connects.

For realizing above-mentioned purpose of the present invention, provide a kind of in network system with a plurality of equipment by digital interface connecting, definite method of the data rate when setting up a device broadcasts output connection, this method comprises the steps, whether compatible mutually from its signal format that will export of this equipment inspection with the signal format of other each equipment being bound up on network system, and, survey the maximum data rate that other each equipment is supported when determining these signal formats when compatible mutually; The data rate that the output of this device broadcasts is connect be defined as the maximum data rate of this equipment and the maximum data rate that detects from miscellaneous equipment among minimum value.

For realizing another object of the present invention, also provide a kind of in network system with a plurality of equipment by digital interface connecting, definite method of the data rate when setting up a device broadcasts output connection, this method may further comprise the steps: the maximum data rate that a plurality of miscellaneous equipment that detection connects with it from this equipment is supported; And the minimum value among the maximum data rate that the data rate that the output of this device broadcasts connects is defined as the maximum data rate of this equipment and detects from miscellaneous equipment.

By describing preferred embodiment and reference accompanying drawing wherein in detail, above-mentioned purpose of the present invention and advantage will be more obvious.In the accompanying drawing,

Fig. 1 is the more detailed block diagram of the output plug control register (oPCR) of digital interface standard use;

Fig. 2 is the more detailed block diagram of the main plug register of output (oMCR) of digital interface standard use;

Fig. 3 represents the universal network system that a plurality of digital devices connect mutually by digital interface such as IEEE1934;

Fig. 4 represents according to the present invention, illustrates that broadcasting data rate determines the example of the network system of method; With

Fig. 5 is illustrated in the flow chart that broadcasting data rate in the equipment with digital interface is determined method.

Hereinafter, will be described with reference to the accompanying drawings the preferred embodiments of the present invention.It is in order to those of ordinary skill in the art the present invention to be described more completely that the preferred embodiments of the present invention are provided.

Fig. 4 is a network system example, is used to illustrate definite method of broadcasting data rate of the present invention.

With reference to figure 4, first equipment 410, second equipment 420, the 3rd equipment 430, the 4th equipment 440 and the 5th equipment 450 have been connect by the IEEE1394 interface.The data rate that each equipment support is certain, for example data rate from 200Mbps to 400Mbps.Suppose the data rate (hereinafter referred to as S200) of first equipment 410 support 200Mbps, second equipment 420 is supported the data rate (hereinafter referred to as S400) of 400Mbps, the 3rd equipment 430 is supported the data rate of S400, the 4th equipment 440 is supported the data rate of S200, and the 5th equipment 450 is supported the data rate of S400.These equipment are set up broadcasting and are connect, and promptly the synchronous connection of transfer of data is to carry out mutual data communication.At this moment, the 5th equipment 450 attempts to be established to the broadcasting output connection of a routing.For purposes of illustration, suppose that the 5th equipment 450 connects the data that send Motion Picture Experts Group (MPEG) form by this broadcasting output.The 5th equipment 450 passes through to compare the signal format of miscellaneous equipment 410-440 and the compatibility of its signal format, determines the data rate of broadcasting output connection.

Fig. 5 is the flow chart that is illustrated in definite method of broadcasting data rate in the equipment with digital interface, describes below with reference to the network system of Fig. 4.

In step 510, the 5th equipment 450 is attempted to connect the data that send mpeg format by broadcasting output.

The 5th equipment 450 checks whether first equipment of being attached in the current network system 410, second equipment 420, the 3rd equipment 430, the 4th equipment 440 can receive the data of the mpeg format that will send effectively.Promptly in step 520, the 5th equipment 450 checks that it is with the compatibility between the signal format of the signal format of output and miscellaneous equipment 410-440.

In step 530, when the 5th equipment 450 determine miscellaneous equipment 410-440 can receive effectively its output signal the time, the 5th equipment 450 is just surveyed the maximum data rate that other each equipment 410-440 is supported.

In step 540, among the maximum data rate that maximum data rate and other each equipment 410-440 of the 5th equipment 450 are supported, obtain minimum value, and the 5th equipment is defined as the data rate that its broadcasting output connects with this minimum value.

For example, because the data rate of second equipment 420 and the 3rd equipment 430 is S400, so when second equipment 420 and the 3rd equipment 430 support mpeg formats, the 5th equipment 450 is broadcasted the data rate of exporting connection and is set to S400.Under situation, with existing method relatively, required bandwidth is reduced to 1/4th of existing method, and in the conventional method, only data rate is set to S100.

In addition, when first equipment 410, second equipment 420 and the 3rd equipment 430 were supported mpeg formats, the maximum data rate of each equipment was respectively S200, S400 and S400.Therefore, the 5th equipment 450 is broadcasted the data rate of exporting connection and is set to minimum value, i.e. S200.In the case, with existing method relatively, required bandwidth is reduced to 1/2nd of existing method, and in the conventional method, only data rate is set to S100.

The present invention is not limited to above preferred embodiment, under the situation that does not break away from the spirit and scope of the present invention various variations can be arranged.That is to say, can omit such processing, promptly can any one equipment be determined the equipment that communicates with and be discerned and receive the signal format that it will be exported.In other words, by obtain minimum value in the maximum data rate of all miscellaneous equipments of current connection, any one equipment can be determined the data rate that its broadcasting output connects.

Simultaneously, by the program on the operation computer usable medium, the aforesaid preferred embodiment of the present invention can be expressed in general digital computer.Computer usable medium includes but not limited to storage medium, as magnetic storage medium (as ROM, floppy disk, hard disk or the like), light computer-readable recording medium (as CD-ROM, DVD or the like) and carrier wave (by the carrier wave of Intenert transmission).Therefore, the present invention can be expressed by computer-readable medium.

As mentioned above, according to the present invention, connecting by digital interface such as IEEE1394 in the network system of a plurality of equipment, when an equipment is set up broadcasting output connection, can effectively utilize the bandwidth of whole network system, reach the purpose that original broadcasting output connects simultaneously again.

Claims (3)

1. a method that is used to determine the data rate when setting up a device broadcasts output connection is used in the network system with a plurality of equipment that connect by IEEE 1394 digital interface agreements, said method comprising the steps of:

Whether compatible from its signal format that will export of this equipment inspection and the signal format that is bound up on other each equipment the network system, and, survey the maximum data rate that other each equipment is supported when determining these signal formats mutually during compatibility; And

The data rate that the output of this device broadcasts is connect be defined as the maximum data rate of this equipment and the maximum data rate that detects from miscellaneous equipment among minimum value.

2. the method for specified data speed as claimed in claim 1, the connection between the wherein said equipment are synchronous connections.

3. a method that is used to determine the data rate when apparatus for establishing broadcasting output connects is used in the network system with a plurality of equipment that connect by IEEE 1394 digital interface agreements, said method comprising the steps of:

The maximum data rate that a plurality of miscellaneous equipment that detection connects with it from this equipment is supported; And

The data rate that the output of this device broadcasts is connect be defined as the maximum data rate of this equipment and the maximum data rate that detects from miscellaneous equipment among minimum value.

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