CN102075704A - Transmitting equipment combined concrete rectangular open caisson basin of CMMB (China Mobile Multimedia Broadcasting) mobile video transmission system and construction method thereof - Google Patents

Transmitting equipment combined concrete rectangular open caisson basin of CMMB (China Mobile Multimedia Broadcasting) mobile video transmission system and construction method thereof Download PDF

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Publication number
CN102075704A
CN102075704A CN2010106164045A CN201010616404A CN102075704A CN 102075704 A CN102075704 A CN 102075704A CN 2010106164045 A CN2010106164045 A CN 2010106164045A CN 201010616404 A CN201010616404 A CN 201010616404A CN 102075704 A CN102075704 A CN 102075704A
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cmmb
data
equipment
transmission system
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CN2010106164045A
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戴闽鲁
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Beijing Peony Electronic Group Co Ltd
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Beijing Peony Electronic Group Co Ltd
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Priority to CN2010106164045A priority Critical patent/CN102075704A/en
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Abstract

The invention discloses a piece of transmitting equipment of a CMMB mobile video transmission system, wherein a collection unit in the equipment is used for collecting multipath original data which is supplied to a multiplexing unit for processing; the multiplexing unit is used for multiplexing the collected multipath original data into a path of data which is supplied to a coding unit for processing; the coding unit is used for coding the path of data into a code stream in format of Moving Picture Experts Group (MPEG) 2, H.264 or AVS (Audio Video Standard); a modulation unit is used for modulating the code stream into a CMMB signal which is supplied to a radio frequency (RF) unit for processing; the RF unit is used for transmitting the CMMB signal to a piece of receiving equipment of the CMMB mobile video transmission system via a radio and TV channel. By the equipment of the invention, a mobile terminal related in the CMMB can be used as a transmitting terminal to upload data actively and support the transmission of uplink data.

Description

The transmitter of CMMB mobile video transmission system
Technical field
The present invention relates to lift-off technology, relate in particular to the transmitter of a kind of China Mobile multimedia broadcasting TV (CMMB, China Mobile Multimedia Broadcasting) mobile video transmission system.
Background technology
CMMB is the system towards portable terminals such as the small screen portable mobile termianls such as mobile phone, PDA, MP3, MP4, digital camera, notebook computer and in-car TVs, and for these portable terminals provide digital broadcast program, these portable terminals can receive multimedia services such as voice data, video data.Existing C MMB only can support the mode propagation data with broadcasting, promptly the portable terminal that relates among the CMMB can only be passive the data of reception transmitting station emission, use as receiving terminal, and can not support transmitting uplink data as transmitting terminal active upload data.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of transmitter of CMMB mobile video transmission system, the ID that when sending data, adds appointment with broadcast mode, make the portable terminal that relates among the CMMB can receive corresponding data according to the ID of this appointment, and send corresponding data to data center (message center or monitoring center), support transmitting uplink data.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of transmitter of CMMB mobile video transmission system, described equipment comprises: collecting unit, Multiplexing Unit, coding unit, modulating unit, radio frequency (RF) unit; Wherein,
Collecting unit is used to gather the multichannel initial data and offers the Multiplexing Unit processing;
Multiplexing Unit, the multichannel initial data that is used for gathering is multiplexed with a circuit-switched data and offers the coding unit processing;
Coding unit is used for a circuit-switched data is encoded into MPEG2 form, the code stream of form or AVS form H.264, to different receiver users, provides different Information ID codings, makes the receiver user with corresponding ID receive corresponding data according to ID;
Modulating unit is used for that code stream is modulated to the CMMB signal and offers the RF cell processing;
The RF unit is used for the CMMB signal is transmitted to by broadcast TV channel the receiving equipment of CMMB mobile video transmission system.
Wherein, described modulating unit, the modulation system that is further used for adopting comprises: binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK) or comprise the quadrature amplitude modulation (16QAM) of 16 kinds of symbols.
Wherein, described coding unit and described modulating unit can integrate, rather than are separately positioned in the described equipment.
Wherein, described modulating unit when being further used for data sync, adopts the mode or the synchronous mode of frequency domain of Domain Synchronous to realize data sync.
Wherein, described equipment is specially: mobile phone, PDA, MP3, MP4, digital camera, notebook computer or in-car TV terminal.
Equipment of the present invention comprises: collecting unit, Multiplexing Unit, coding unit, modulating unit, radio frequency (RF) unit; Wherein, collecting unit is used to gather the multichannel initial data and offers Multiplexing Unit and handle; The multichannel initial data that Multiplexing Unit is used for gathering is multiplexed with a circuit-switched data and offers the coding unit processing; Coding unit is used for a circuit-switched data is encoded into MPEG2 form, the code stream of form or AVS form H.264, to different receiver users, different Information ID codings is provided, and only is to make the receiver user of the ID with this appointment just can receive corresponding data according to the ID of this appointment; Modulating unit is used for that code stream is modulated to the CMMB signal and offers the RF cell processing; The RF unit is used for the CMMB signal is transmitted to by broadcast TV channel the receiving equipment of CMMB mobile video transmission system.Adopt equipment of the present invention, support transmitting uplink data.
Description of drawings
Fig. 1 is the composition structural representation of transmitter of the present invention.
Embodiment
Basic thought of the present invention is: equipment comprises collecting unit, Multiplexing Unit, coding unit, modulating unit, RF unit; Wherein, collecting unit is used to gather the multichannel initial data and offers Multiplexing Unit and handle; The multichannel initial data that Multiplexing Unit is used for gathering is multiplexed with a circuit-switched data and offers the coding unit processing; Coding unit is used for a circuit-switched data is encoded into MPEG2 form, the code stream of form or AVS form H.264, to different receiver users, provides different Information ID codings, makes the receiver user with corresponding ID receive corresponding data according to ID; Modulating unit is used for that code stream is modulated to the CMMB signal and offers the RF cell processing; The RF unit is used for the CMMB signal is transmitted to broadcast TV channel by broadcast mode the receiving equipment of CMMB mobile video transmission system.
For making the purpose, technical solutions and advantages of the present invention clearer, by the following examples and with reference to accompanying drawing, the present invention is described in more detail.
A kind of transmitter of CMMB mobile video transmission system, as shown in Figure 1, this equipment comprises: collecting unit, Multiplexing Unit, coding unit, modulating unit, RF unit.Wherein, collecting unit is used to gather the multichannel initial data and offers the Multiplexing Unit processing.Multiplexing Unit, the multichannel initial data that is used for gathering is multiplexed with a circuit-switched data and offers the coding unit processing.Coding unit, be used for a circuit-switched data is encoded into MPEG2 form, the code stream of form or AVS form H.264, to different receiver users, different Information ID codings is provided, only be to make the receiver user of the ID with this appointment just can receive corresponding data according to the ID of this appointment.Modulating unit is used for that code stream is modulated to the CMMB signal and offers the RF cell processing.The RF unit is used for the CMMB signal is transmitted to by broadcast TV channel the receiving equipment of CMMB mobile video transmission system.
Here, the collecting unit initial data of gathering comprises sound, video data.
Here, Multiplexing Unit is the unit of realizing a circuit-switched data process that multichannel data is merged into, and multiplexing purpose is better shared channel resources, the adaptive channel transmission.
Here, coding unit is the unit that is used to realize sound, video initial data are carried out compression encoding process.
Here, modulating unit is by the processing to signal source (MPEG2 form, H.264 the code stream of form or AVS form) it to be modulated to the unit that is fit to Channel Transmission form (the Channel Transmission form that relates in the transmission of CMMB signal can be passed through broadcast television channel) process, and further the modulation system that adopts comprises: BPSK, QPSK or 16QAM.Wherein, BPSK refers to binary phase shift keying, is a kind of digital modulation mode; The QPSK friendship phase shift keying of making a comment or criticism is a kind of digital modulation mode; 16QAM refers to comprise the quadrature amplitude modulation of 16 kinds of symbols, is a kind of digital modulation mode.
Here, also coding unit and modulating unit can be integrated, rather than be separately positioned in the transmitter.
Here, transmitter of the present invention was divided into 40 time slots with 1 second, and each Time Slot Occupancy 25ms, the time slot here are the minimum channel resources of dividing according to the time in the time slicing techniques, and using time slot mainly is in order to save the electric quantity consumption of transmitter.
Here, collecting unit can be camera, directly gathers digital signal.Collecting unit also can be gathered analog signal earlier, again by the digital/analog signal transducer in the collecting unit, is to offer Multiplexing Unit after the digital signal to handle with the analog signal conversion of gathering.
In addition, because existing C MMB carries out transfer of data with broadcast mode.Transmitter of the present invention is supported the transfer of data of one-to-many, and promptly a plurality of portable terminals can be uploaded data to a transmitting station, and need consider the problem of data sync this moment.Solving data sync is by adopting time domain or the synchronous mode of frequency domain to realize in the modulating unit.
Here, transmitter of the present invention can comprise portable terminals such as the small screen portable mobile termianls such as mobile phone, PDA, MP3, MP4, digital camera, notebook computer and in-car TV, the portable terminal that is particularly useful for small-size screen below 7 cun is to guarantee the definition of screen display.
The physics realization form of above-mentioned portable terminal comprises the built-in and external dual mode of external connection module of all-in-one.The built-in finger of so-called all-in-one: module included in the transmitter with the invention described above directly is built in portable terminal inside; The external finger of so-called external connection module: included module is placed in the standalone module of portable terminal outside in the transmitter with the invention described above, for example, included module in the transmitter of SD card storage the invention described above that can be by portable terminal, work matches with portable terminal; Maybe will store the standalone module of module included in the transmitter of the invention described above, by the USB mouth cooperating that links to each other with portable terminal.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims (5)

1. the transmitter of a CMMB mobile video transmission system is characterized in that, described equipment comprises: collecting unit, Multiplexing Unit, coding unit, modulating unit, radio frequency (RF) unit; Wherein,
Collecting unit is used to gather the multichannel initial data and offers the Multiplexing Unit processing;
Multiplexing Unit, the multichannel initial data that is used for gathering is multiplexed with a circuit-switched data and offers the coding unit processing;
Coding unit is used for a circuit-switched data is encoded into MPEG2 form, the code stream of form or AVS form H.264, to different receiver users, provides different Information ID codings, makes the receiver user with corresponding ID receive corresponding data according to ID;
Modulating unit is used for that code stream is modulated to the CMMB signal and offers the RF cell processing;
The RF unit is used for the CMMB signal is transmitted to by broadcast TV channel the receiving equipment of CMMB mobile video transmission system.
2. equipment according to claim 1, it is characterized in that, described modulating unit, the modulation system that is further used for adopting comprises: binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK) or comprise the quadrature amplitude modulation (16QAM) of 16 kinds of symbols.
3. equipment according to claim 1 and 2 is characterized in that, described coding unit and described modulating unit can integrate, rather than are separately positioned in the described equipment.
4. equipment according to claim 1 and 2 is characterized in that, described modulating unit when being further used for data sync, adopts the mode or the synchronous mode of frequency domain of Domain Synchronous to realize data sync.
5. equipment according to claim 1 and 2 is characterized in that, described equipment is specially: mobile phone, PDA, MP3, MP4, digital camera, notebook computer or in-car TV terminal.
CN2010106164045A 2010-12-30 2010-12-30 Transmitting equipment combined concrete rectangular open caisson basin of CMMB (China Mobile Multimedia Broadcasting) mobile video transmission system and construction method thereof Pending CN102075704A (en)

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Cited By (1)

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CN102523510A (en) * 2011-12-24 2012-06-27 深圳市同洲电子股份有限公司 Multiscreen interaction method and apparatus thereof, and digital television all-in-one machine

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Application publication date: 20110525