CN106375818A - DTMB terrestrial digital television receiving terminal device and playing method thereof - Google Patents
DTMB terrestrial digital television receiving terminal device and playing method thereof Download PDFInfo
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- CN106375818A CN106375818A CN201610868796.1A CN201610868796A CN106375818A CN 106375818 A CN106375818 A CN 106375818A CN 201610868796 A CN201610868796 A CN 201610868796A CN 106375818 A CN106375818 A CN 106375818A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6162—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving terrestrial transmission, e.g. DVB-T
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention discloses DTMB (Digital Television Terrestrial Multimedia Broadcasting) terrestrial digital television receiving terminal device and a playing method thereof. The DTMB terrestrial digital television receiving terminal device comprises an antenna, a radio frequency low-noise amplification module, a tuning module, a demodulation module, a data conversion module, a power module and an interface; the antenna receives a television program source signal; the radio frequency low-noise amplification module amplifies a radio frequency signal at a high frequency and outputs the radio frequency signal; the tuning module converts the radio frequency signal into an intermediate frequency signal; the demodulation module after performing channel decoding and demodulation on the intermediate frequency signal outputs a TS code stream signal; the data conversion module converts the TS code stream signal into a USB differential data signal and transmits the USB differential data signal to an intelligent device for playing; the power module when detecting insertion of an intelligent device reduces a power supply voltage input at the interface to the voltage of a machine power supply and a machine system power supply. Therefore, terrestrial broadcasting digital television or mobile digital television programs can be watched in a traffic-free mode under a condition of no network, the operation is simple and the practicability is strong.
Description
Technical field
The present invention relates to terrestrial DTV technical field, more particularly, to a kind of dtmb ground digital TV receiving terminal sets
Standby and its player method.
Background technology
Smart mobile phone at this stage, intelligent pad and all smart machines with screen display in use, heavy dependence
Wifi wireless network, 4g network is watching TV programme.And much occasion does not have wifi network or 4g network, or network signal is not
Good.So user will be unable to watch TV programme using these smart machines under the scene of no wifi network, or network letter
When number poor TV programme often buffering and affect viewing effect.And, under at this stage, TV programme are watched using 4g network
Flow consume very huge, increase user flow spend.
Therefore, prior art has yet to be improved and developed.
Content of the invention
In view of in place of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of dtmb terrestrial DTV connects
Receive terminal unit and its player method, to solve the problems, such as that existing smart machine can not watch TV programme in the case of no netting.
In order to achieve the above object, this invention takes technical scheme below:
A kind of dtmb ground digital TV receiving terminal equipment, is connected with smart machine, and it includes antenna, radio frequency low-noise amplifies
Module, tuner module, demodulation module, data conversion module, power module and interface；
Described antenna receives TV programme source signal, exports radiofrequency signal by radio frequency low-noise amplification module High frequency amplification, adjusts
Radiofrequency signal is converted to intermediate-freuqncy signal by humorous module, and demodulation module exports ts code after intermediate-freuqncy signal is carried out with channel decoding and demodulation
Stream signal, ts signal bit stream is converted to usb differential data signals and is transferred to smart machine by interface by data conversion module
Play；During power module detection smart machine insertion, the supply voltage blood pressure lowering that interface is inputted is whole electromechanical source and machine system
Power supply is powered to radio frequency low-noise amplification module, tuner module, demodulation module, data conversion module.
In described dtmb ground digital TV receiving terminal equipment, described radio frequency low-noise amplification module include terminal,
Radio frequency amplification chip, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first inductance and first resistor；
1st foot of described terminal passes through rf_in foot, the 2nd foot of terminal and the 3rd foot of the first capacitance connection radio frequency amplification chip
Ground connection, antenna inserts terminal；The vcc foot of radio frequency amplification chip connects one end of first resistor, one end of the second electric capacity and first
Power end；The other end ground connection of the second electric capacity, the other end of first resistor connects one end of the first inductance；Radio frequency amplification chip
Ctrl foot connects one end of the second electric capacity, also by the 4th capacity earth；The rf_out foot of radio frequency amplification chip connects the first electricity
The other end of sense and one end of the 3rd electric capacity, the other end of the 3rd electric capacity connects tuner module.
In described dtmb ground digital TV receiving terminal equipment, described tuner module includes tuning chip, the second electricity
Sense, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity and the first magnetic bead；
The lna_inp foot of described tuning chip passes through the 2nd foot of the 5th capacitance connection the second inductance, the lna_inn of tuning chip
Foot passes through the 1st foot of the 6th capacitance connection the second inductance, and the 3rd foot of the second inductance connects one end of the 8th electric capacity, the second inductance
The 4th foot ground connection, the other end of the 8th electric capacity connects the other end of the 3rd electric capacity, and the vdd_1p8 foot of tuning chip connects second
Power end；The agc foot of tuning chip, if_outn foot, if_outp foot, sda foot, scl foot are all connected with demodulation module；Tuning chip
Vdd_3p3 foot connect one end of the first power end, one end of the first magnetic bead and the 7th electric capacity, the other end of the first magnetic bead connects
Whole electromechanical source, the 7th electric capacity other end ground connection.
In described dtmb ground digital TV receiving terminal equipment, described tuner module also includes protection diode and
Two resistance；
One end of described protection diode connects the 3rd foot of the second inductance and one end of the 8th electric capacity, protection diode another
End ground connection, one end of second resistance connects the agc foot of tuning chip, and the other end of second resistance connects demodulation module.
In described dtmb ground digital TV receiving terminal equipment, described demodulation module includes demodulation chip, the 3rd electricity
Resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 9th electric capacity, the tenth electric capacity and
11st electric capacity；
The inp_i foot of described demodulation chip connects one end of the 4th resistance and one end of the tenth electric capacity, the other end of the 4th resistance
Connect the 5th power end, the other end of the tenth electric capacity connects the if_outn foot of tuning chip, the inn_i foot of demodulation chip connects
One end of 5th resistance and one end of the 11st electric capacity, the other end of the 5th resistance connects the 5th power end, the 11st electric capacity
The other end connects the if_outp foot of tuning chip, and the agc_if foot of demodulation chip connects one end of 3rd resistor；3rd resistor
The other end connects the other end of second resistance, also by the 9th capacity earth；The scl_t foot of demodulation chip connects tuning chip
Scl foot, also by the 6th resistance connect the 4th power end；The sda_t foot of demodulation chip connects the sda foot of tuning chip, also logical
Cross the 7th resistance and connect the 4th power end；The scl foot of demodulation chip connects data conversion module, connects the also by the 8th resistance
Four power ends；The sda foot of demodulation chip connects data conversion module, connects the 4th power end also by the 9th resistance；Solution aligning
The ts_d0 foot of piece, ts_d1 foot, ts_d2 foot, ts_d3 foot, ts_d4 foot, ts_d5 foot, ts_d6 foot, ts_d7 foot, ts_clk foot
It is all connected with data conversion module；The vdd12_1 foot of demodulation chip, vdd12_2 foot, vdd12_3 foot, vdd12_4 foot, vdd12_5
Foot, vdd12_6 foot are all connected with the 3rd power end；The vdd33_1 foot of demodulation chip, vdd33_2 foot, vdd33_3 foot, vdd33_4
Foot, vdd33_5 foot are all connected with the 4th power end.
In described dtmb ground digital TV receiving terminal equipment, it is in parallel that described demodulation module also includes several electric capacity
The first capacitance group, several electric capacity the second capacitance group in parallel, the second magnetic bead, the 3rd magnetic bead, the tenth resistance, the 11st resistance
With the 12nd electric capacity；
One end of described second magnetic bead connects machine system power end, some in other end connection first capacitance group of the second magnetic bead
Individual one end of electric capacity in parallel and the 3rd power end, the other end ground connection of several electric capacity in parallel in the first capacitance group；3rd
Power end passes through one end, one end of the 12nd electric capacity and the 5th power end that the tenth resistance connects the 11st resistance；11st electricity
The other end of resistance connects the other end and the ground of the 12nd electric capacity；One end of 3rd magnetic bead connects whole electromechanics source, the 3rd magnetic bead
The other end connects one end of several electric capacity in parallel and the 4th power end in the second capacitance group, and in the second capacitance group, several are simultaneously
The other end ground connection of the electric capacity of connection.
In described dtmb ground digital TV receiving terminal equipment, described data conversion module includes conversion chip and deposits
Reservoir；
The rdy1 foot of described conversion chip connects the ts_clk foot of demodulation chip, and the dplus foot of conversion chip and dminus foot are even
Connection interface, the scl foot of conversion chip connects the scl foot of demodulation chip and the scl foot of memorizer, and the sda foot of conversion chip connects
The sda foot of demodulation chip and the sda foot of memorizer, the pb0 foot of conversion chip connects the ts_d0 foot of demodulation chip, conversion chip
Pb1 foot connect the ts_d1 foot of demodulation chip, the pb2 foot of conversion chip connects the ts_d2 foot of demodulation chip, conversion chip
Pb3 foot connects the ts_d3 foot of demodulation chip, and the pb4 foot of conversion chip connects the ts_d4 foot of demodulation chip, the pb5 of conversion chip
Foot connects the ts_d5 foot of demodulation chip, and the pb6 foot of conversion chip connects the ts_d6 foot of demodulation chip, the pb7 foot of conversion chip
Connect the ts_d7 foot of demodulation chip, the avcc_3 foot of conversion chip connects the 6th power end.
In described dtmb ground digital TV receiving terminal equipment, described data conversion module also include the 4th magnetic bead and
Several electric capacity the 3rd capacitance group in parallel；
One end of described 4th magnetic bead connects whole electromechanics source, and the other end of the 4th magnetic bead connects in the 3rd capacitance group several simultaneously
One end of electric capacity of connection and the 6th power end, the other end ground connection of several electric capacity in parallel in the 3rd capacitance group.
In described dtmb ground digital TV receiving terminal equipment, the peripheral circuit of described interface include the 3rd inductance,
First electrostatic protection diode, the second electrostatic protection diode, the 3rd electrostatic protection diode and the 13rd electric capacity；
The vbus foot of described interface connects one end of feeder ear, one end of the 3rd electrostatic protection diode and the 13rd electric capacity；Connect
The d- foot of mouth connects the 3rd foot of the 3rd inductance and one end of the first electrostatic protection diode, and the d+ foot of interface connects the 3rd inductance
The 2nd foot and the second electrostatic protection diode one end；The gnd foot of interface, shield1 foot, shield2 foot are all grounded；First
The other end of electrostatic protection diode, the other end of the second electrostatic protection diode, the other end of the 3rd electrostatic protection diode
All it is grounded；1st foot of the 3rd inductance connects the dplus foot of conversion chip, and the 4th foot of the 3rd inductance connects conversion chip
Dminus foot.
In described dtmb ground digital TV receiving terminal equipment, described power module includes:
First power conversion unit, obtains whole electromechanical source after the supply voltage blood pressure lowering for the smart machine transmitting interface；
Second source converting unit, for obtaining machine system power supply after described supply voltage blood pressure lowering.
A kind of player method for realizing described dtmb ground digital TV receiving terminal equipment it is characterised in that
Comprise the steps:
During power module detection smart machine insertion, the supply voltage blood pressure lowering that interface is inputted is whole electromechanical source and machine system electricity
Source is powered；
Antenna receives TV programme source signal, exports radiofrequency signal by radio frequency low-noise amplification module High frequency amplification；
Radiofrequency signal is converted to intermediate-freuqncy signal by tuner module；
Demodulation module exports ts signal bit stream after intermediate-freuqncy signal is carried out with channel decoding and demodulation；
Ts signal bit stream is converted to usb differential data signals and is transferred to smart machine by interface and broadcasts by data conversion module
Put.
A kind of dtmb ground digital TV receiving terminal equipment providing compared to prior art, the present invention and its broadcasting side
Method, receives TV programme source signal by antenna, exports radiofrequency signal, tuning by radio frequency low-noise amplification module High frequency amplification
Radiofrequency signal is converted to intermediate-freuqncy signal by module, and demodulation module exports ts code stream after intermediate-freuqncy signal is carried out with channel decoding and demodulation
Signal, ts signal bit stream is converted to usb differential data signals and is transferred to smart machine by interface and broadcasts by data conversion module
Put；During power module detection smart machine insertion, the supply voltage blood pressure lowering that interface is inputted is whole electromechanical source and machine system electricity
Source powers to radio frequency low-noise amplification module, tuner module, demodulation module, data conversion module.So in the case of no netting i.e.
Can achieve that exempting from flow watches terrestrial broadcasting DTV or mobile digital TV program, simple to operate, practical.
Brief description
Fig. 1 is the structured flowchart of the dtmb ground digital TV receiving terminal equipment that the present invention provides；
Fig. 2 is the circuit of radio frequency low-noise amplification module in the dtmb ground digital TV receiving terminal equipment that the present invention provides
Figure；
Fig. 3 is the circuit diagram of tuner module in the dtmb ground digital TV receiving terminal equipment that the present invention provides；
Fig. 4 a ~ 4e is the circuit diagram of demodulation module in the dtmb ground digital TV receiving terminal equipment that the present invention provides；
Fig. 5 and Fig. 6 is the circuit diagram of data conversion module in the dtmb ground digital TV receiving terminal equipment that the present invention provides；
Fig. 7 is the circuit diagram of interface and its peripheral circuit in the dtmb ground digital TV receiving terminal equipment that the present invention provides；
Fig. 8 is the first power conversion unit of power module in the dtmb ground digital TV receiving terminal equipment that the present invention provides
Circuit diagram；
Fig. 9 is the player method flow chart of the dtmb ground digital TV receiving terminal equipment that the present invention provides.
Specific embodiment
The invention provides a kind of dtmb(digital television terrestrial multimedia
Broadcasting, digital television ground broadcast transmission system frame structure, Channel Coding and Modulation) terrestrial DTV reception is eventually
End equipment and its player method, divide the terrestrial broadcast television soverlay technique using current popularization, dtmb terrestrial DTV are connect
Receive terminal unit insertion smart mobile phone, the usb interface of intelligent pad or all smart machines with screen display, pass through
The antenna of dtmb ground digital TV receiving terminal equipment obtains TV programme signal and is converted into what smart machine can identify
Usb data form.So user can exempt from flow in the case of no netting and watches terrestrial broadcasting DTV or mobile numeral electricity
Depending on program, simple to operate, practical, exempt from flow.For making the objects, technical solutions and advantages of the present invention clearer, clear and definite,
The present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.It should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
Refer to Fig. 1, described dtmb ground digital TV receiving terminal equipment is connected with smart machine by interface 70, its
Including antenna 10, radio frequency low-noise amplification module 20, tuner module 30, demodulation module 40, data conversion module 50, power module
60 and interface 70.Antenna 10 receives TV programme source signal, exports radio frequency by radio frequency low-noise amplification module 20 High frequency amplification
Signal, the radiofrequency signal of selected frequency is converted to intermediate-freuqncy signal by tuner module 30, and demodulation module 40 carries out letter to intermediate-freuqncy signal
Ts signal bit stream is exported, ts signal bit stream is converted to usb differential data signals by data conversion module 50 after road decoding and demodulation
And smart machine (smart mobile phone, intelligent pad or all smart machines with screen display) is transferred to by interface 70.Intelligence
Player i.e. playable TV programme can be passed through by equipment.The supply voltage blood pressure lowering that interface 70 inputs is whole electromechanics by power module 60
Source and machine system power supply supply to radio frequency low-noise amplification module 20, tuner module 30, demodulation module 40, data conversion module 50
Electricity.
Described dtmb ground digital TV receiving terminal equipment is equivalent to a kind of dtmb signal demodulating apparatus, in the present embodiment
Interface 70 adopt usb interface, then data conversion module 50 be by usb data conversion.Intelligent handss are accessed by usb otg line
Machine or be directly accessed intelligent pad and other carry screen display and have usb typea interface smart machine (if intelligence
Equipment only has common micro usb interface, then the present embodiment accesses smart machine by usb otg line), just can freely receive
See terrestrial broadcasting DTV or mobile digital TV program, simple to operation, do not interfere with user mobile phone or other intelligence
The normal use of energy equipment.In the specific implementation, described dtmb ground digital TV receiving terminal equipment also can be connect by other
Mouth or radio connection are connected with smart machine, are not restricted herein.
Due to radio frequency, to accept circuit signal operating frequency very high, is easily subject to various noise jamming.The present embodiment passes through
Radio frequency low-noise amplification module will be amplified from the microvolt magnitude voltage signals accepting antenna, and steady operation is in 900mhz
Under, and ensure the coefficient optimum of radiofrequency signal various parameters on the basis of amplifying.See also Fig. 2, described radiofrequency low-noise
Sound amplification module 20 includes terminal j1, radio frequency amplification chip u1, the first electric capacity c1, the second electric capacity c2, the 3rd electric capacity c3, the 4th electricity
Hold c4, the first inductance l1 and first resistor r1；1st foot of described terminal j1 passes through the first electric capacity c1 and connects radio frequency amplification chip u1
Rf_in foot, the 2nd foot of terminal j1 and the 3rd foot ground connection, antenna insert terminal j1；The vcc foot of radio frequency amplification chip u1 connects
One end of first resistor r1, one end of the second electric capacity c2 and the first power end rf_3v3；The other end ground connection of the second electric capacity c2, the
The other end of one resistance r1 connects one end of the first inductance l1；The ctrl foot of radio frequency amplification chip u1 connects the one of the second electric capacity c2
Hold, be grounded also by the 4th electric capacity c4；The rf_out foot of radio frequency amplification chip u1 connects the other end and the 3rd of the first inductance l1
One end of electric capacity c3, the other end of the 3rd electric capacity c3 connects tuner module 30.
The antenna of insertion terminal j1 can be collapsible mast or sucker antenna, and small volume is convenient for carrying.TV programme source signal
After being received by the antenna, radio frequency amplification chip u1 is entered by terminal j1 and carry out radio frequency low-noise amplification, after isolated DC leads to exchange
Output radiofrequency signal rf_mxl.Wherein, model bgu7045 of radio frequency amplification chip u1.First electric capacity c1 is coupled capacitor, rises
To isolated DC, lead to the effect of exchange.Also can be connected in parallel with a capacitor again with the second electric capacity c2 when second electric capacity c2(is embodied as)
First power supply is filtered.First inductance l1 is biasing coupling inductance moreover it is possible to prevent radiofrequency signal from entering DC source.First electricity
Resistance r1 is biasing resistor, and radio frequency amplification chip u1 has been internally integrated bias control circuit, and the present embodiment increases by the first electricity outside
Resistance r1 can meet offset requirements.3rd electric capacity c3 is used for isolated DC for coupled capacitor, leads to exchange.First inductance l1 and the 3rd
Electric capacity c3 is constituted output matching network and is matched with rear end microstrip line, exports radiofrequency signal rf_mxl.
See also Fig. 3, described tuner module 30 includes: tuning chip u2, the second inductance l2, the 5th electric capacity c5,
Six electric capacity c6, the 7th electric capacity c7, the 8th electric capacity c8 and the first magnetic bead fb1；The lna_inp foot of described tuning chip u2 passes through the 5th
Electric capacity c5 connects the 2nd foot of the second inductance l2, and the lna_inn foot of tuning chip u2 passes through the 6th electric capacity c6 and connects the second inductance l2
The 1st foot, the second inductance l2 the 3rd foot connect the 8th electric capacity c8 one end, the second inductance l2 the 4th foot ground connection, the 8th electric capacity
The other end of c8 connects the other end of the 3rd electric capacity c3, and the vdd_1p8 foot of tuning chip u2 connects second source end rf_1v8；Adjust
The agc foot of humorous chip u2, if_outn foot, if_outp foot, sda foot, scl foot are all connected with demodulation module 40；Tuning chip u2's
Vdd_3p3 foot connects one end of the first power end rf_3v3, one end of the first magnetic bead fb1 and the 7th electric capacity c7, the first magnetic bead fb1
The other end connect whole electromechanical source vcc_3v3, the 7th the electric capacity c7 other end ground connection.
Wherein, model mxl603 of tuning chip u2.Second inductance l2 is common mode inductance.Prime radio frequency low-noise amplifies
Radiofrequency signal rf_mxl of module 20 output, through the interference of common mode inductance filter electromagnetic, again respectively through the 5th electric capacity c5 and the
After six electric capacity c6 filtering, respectively enter the 2nd foot and the 3rd foot of tuning chip u2.Radiofrequency signal rf_ that tuning chip u2 will input
The demodulation module 40 that mxl is converted to intermediate-freuqncy signal (if_n, if_p) and exports to rear class uses.Wherein, amplitude-modulated signal if_agc
(being exported by demodulation module 40) controls the amplitude of the amplification signal of tuning chip u2, and the worth change of amplitude-modulated signal if_agc is too fast
Or excessively all can have influence on the sensitivity accepting signal of tuner slowly.Tuning configuration signal (tuner_sda, the tuner_ of input
Scl, the 16th foot and the 17th foot that are connected to tuning chip u2 being exported by i2c mode by demodulation module 40) adjust for controlling
The parameter configuration such as the agc time constant of humorous chip u2.The whole electromechanical source of whole electromechanics source vcc_3v3 output is through the first magnetic bead
Fb1 isolates, and exports the first power supply (i.e. magnitude of voltage 3.3v on the first power end rf_3v3) as tune after the 7th electric capacity c7 filtering
The working power of humorous chip u2.Tuning chip u2 exports second source (i.e. second source to after the first power voltage step down from its 4th foot
Magnitude of voltage 1.8v on the rf_1v8 of end).
In further embodiment, described tuner module 30 also includes protection diode ds and second resistance r2；Described protection
One end of diode ds connects the 3rd foot of the second inductance l2 and one end of the 8th electric capacity c8, another termination of protection diode ds
Ground, one end of second resistance r2 connects the agc foot of tuning chip u2, and the other end of second resistance r2 connects demodulation module 40.
Described protection diode ds plays antistatic pincers and defends effect, when the electrostatic of several kv protects two after terminal j1 input
Pole pipe ds is reversed and punctures, and electrostatic charge is quickly released to ground simultaneously.Second resistance r2 limits to amplitude-modulated signal if_agc
Stream, it is to avoid high current damages tuning chip u2.
See also Fig. 4 a, Fig. 4 b and Fig. 4 c, described demodulation module 40 includes: demodulation chip u3,3rd resistor r3,
Four resistance r4, the 5th resistance r5, the 6th resistance r6, the 7th resistance r7, the 8th resistance r8, the 9th resistance r9, the 9th electric capacity c9,
Ten electric capacity c10 and the 11st electric capacity c11；The inp_i foot of described demodulation chip u3 connects one end and the tenth electricity of the 4th resistance r4
Hold one end of c10, the other end of the 4th resistance r4 connects the 5th power end ad_vref, and the other end of the tenth electric capacity c10 connects to be adjusted
The if_outn foot of humorous chip u2, one end of inn_i foot connection the 5th resistance r5 of demodulation chip u3 and the 11st electric capacity c11's
One end, the other end of the 5th resistance r5 connects the 5th power end ad_vref, and the other end of the 11st electric capacity c11 connects tuning core
The if_outp foot of piece u2, the agc_if foot of demodulation chip u3 connects one end of 3rd resistor r3；The other end of 3rd resistor r3 is even
Connect the other end of second resistance r2, be grounded also by the 9th electric capacity c9；The scl_t foot of demodulation chip u3 connects tuning chip u2's
Scl foot, also by the 6th resistance r6 connect the 4th power end vdd_io；The sda_t foot of demodulation chip u3 connects tuning chip u2
Sda foot, also by the 7th resistance r7 connect the 4th power end vdd_io；The scl foot of demodulation chip u3 connects data conversion mould
Block 50, also by the 8th resistance r8 connect the 4th power end vdd_io；The sda foot of demodulation chip u3 connects data conversion module
50th, connect the 4th power end vdd_io also by the 9th resistance r9；The ts_d0 foot of demodulation chip u3, ts_d1 foot, ts_d2 foot,
Ts_d3 foot, ts_d4 foot, ts_d5 foot, ts_d6 foot, ts_d7 foot, ts_clk foot are all connected with data conversion module 50；Demodulation chip
The vdd12_1 foot of u3, vdd12_2 foot, vdd12_3 foot, vdd12_4 foot, vdd12_5 foot, vdd12_6 foot are all connected with the 3rd power supply
End vdd_core；The vdd33_1 foot of demodulation chip u3, vdd33_2 foot, vdd33_3 foot, vdd33_4 foot, vdd33_5 foot all connect
Meet the 4th power end vdd_io.
Wherein, model hd2318 of demodulation chip u3.1st foot of demodulation chip u3 and the 2nd foot receive tuning chip u2
The intermediate-freuqncy signal (if_n, if_p) of output is simultaneously demodulated changing, output ts signal bit stream (usb_ts_d0, usb_ts_d1,
Usb_ts_d2, usb_ts_d3, usb_ts_d4, usb_ts_d5, usb_ts_d6, usb_ts_d7, usb_ts_clk) give
The data conversion module 50 of rear class.
The amplitude-modulated signal if_agc of the 9th foot output of demodulation chip u3 forms through 3rd resistor r3 and the 9th electric capacity c9
The agc(exporting to tuning chip u2 after rc filtering is the 6th foot) control gain amplifier.The scl foot of demodulation chip u3 and sda foot are defeated
Go out the parameter configuration that conversion configurations signal (dtmb_scl, dtmb_sda) controls the data conversion module of rear class.
See also Fig. 4 d and Fig. 4 e, in further embodiment, described demodulation module 40 also includes several electric capacity simultaneously
First capacitance group 410 of connection, several electric capacity the second capacitance group 420 in parallel, the second magnetic bead fb2, the 3rd magnetic bead fb3, the tenth
Resistance r10, the 11st resistance r11 and the 12nd electric capacity c12；One end of described second magnetic bead fb2 connects machine system power end
The other end of vcc_1v2, the second magnetic bead fb2 connects one end of several electric capacity in parallel and the 3rd electricity in the first capacitance group 410
Source vdd_core, the other end ground connection of several electric capacity in parallel in the first capacitance group 410；3rd power end vdd_core leads to
Cross one end, one end of the 12nd electric capacity c12 and the 5th power end ad_vref that the tenth resistance r10 connects the 11st resistance r11；
The other end of the 11st resistance r11 connects the other end and the ground of the 12nd electric capacity；One end of 3rd magnetic bead fb3 connects whole electromechanical source
End vcc_3v3, the other end of the 3rd magnetic bead fb3 connects one end and the 4th of several electric capacity in parallel in the second capacitance group 420
Power end vdd_io, the other end ground connection of several electric capacity in parallel in the second capacitance group 420.
The working power of demodulation chip u3 is provided by the 3rd power end vdd_core and the 4th power end vdd_io.3rd
Power end vdd_core is through the second magnetic by machine system supply voltage (voltage on machine system power end vcc_1v2)
Pearl fb2 isolates, and obtains 1.2v working power after the first capacitance group 410 filtering.4th power end vdd_io is by whole electromechanics source
Voltage on vcc_3v3 is isolated through the 3rd magnetic bead fb3, obtains 3.3v working power after the second capacitance group 420 filtering.Solution aligning
The ts_d7 foot of piece u3, ts_clk foot
See also Fig. 5, Fig. 6 and Fig. 7, described data conversion module 50 includes conversion chip u4 and memorizer u5；Described turn
The rdy1 foot changing chip u4 connects the ts_clk foot of demodulation chip u3, and the dplus foot of conversion chip u4 and dminus foot connect
Mouth 70, the scl foot of conversion chip u4 connects the scl foot of demodulation chip u3 and the scl foot of memorizer u5, the sda of conversion chip u4
Foot connects the sda foot of demodulation chip u3 and the sda foot of memorizer u5, and the pb0 foot of conversion chip u4 connects the ts_ of demodulation chip u3
D0 foot, the pb1 foot of conversion chip u4 connects the ts_d1 foot of demodulation chip u3, and the pb2 foot of conversion chip u4 connects demodulation chip u3
Ts_d2 foot, the pb3 foot of conversion chip u4 connects the ts_d3 foot of demodulation chip u3, and the pb4 foot of conversion chip u4 connects demodulation
The ts_d4 foot of chip u3, the pb5 foot of conversion chip u4 connects the ts_d5 foot of demodulation chip u3, and the pb6 foot of conversion chip u4 is even
Connect the ts_d6 foot of demodulation chip u3, the pb7 foot of conversion chip u4 connects the ts_d7 foot of demodulation chip u3, conversion chip u4's
Avcc_3 foot connects the 6th power end usb_3v3.
Wherein, model cy7c68013a of described conversion chip u4.The pb0 foot of conversion chip u4, pb1 foot, pb2 foot,
Pb3 foot, pb4 foot, pb5 foot, pb6 foot, pb7 foot are two-way fifo data/address bus, and these feet and rdy1 foot are used for receiving prime
Ts signal bit stream (usb_ts_d0, usb_ts_d1, usb_ts_d2, usb_ts_d3, usb_ts_ of demodulation chip u3 output
D4, usb_ts_d5, usb_ts_d6, usb_ts_d7, usb_ts_clk), it is then converted into usb differential data signals (dplus
, dminus) and exported to interface 70 by the dplus foot and dminus foot of conversion chip u4.Interface 70 transmits usb difference number again
It is believed that number (dplus, dminus) gives smart machine.The scl foot of conversion chip u4 is used for transmitting the clock signal of i2c form
The sda foot of usb_scl_a, conversion chip u4 is used for transmitting the data signal of i2c form.By this two i2c pin configuration
The depositor of conversion chip u4.Memorizer u5 is eeprom, for preserving some configuration files, passes through usb_ by conversion chip u4
Scl_a, usb_sda_a are written and read controlling.
As shown in fig. 6, described data conversion module 50 also includes the 3rd electricity of the 4th magnetic bead fb4 and the parallel connection of several electric capacity
Appearance group 430；One end of 4th magnetic bead fb4 connects whole electromechanics source vcc_3v3, and the other end of the 4th magnetic bead fb4 connects the 3rd electricity
One end of several electric capacity in parallel and the 6th power end usb_3v3 in appearance group 430, in the 3rd capacitance group 430, several are in parallel
Electric capacity the other end ground connection.The working power of conversion chip u4 is by the voltage on whole electromechanical source vcc_3v3 through the 4th magnetic bead
Fb4 isolates, and obtains the working power of the 3.3v on the 6th power end usb_3v3 after the 3rd capacitance group 430 filtering.
As shown in fig. 7, the peripheral circuit of interface 70 include the 3rd inductance l3, the first electrostatic protection diode esd1, second
Electrostatic protection diode esd2, the 3rd electrostatic protection diode esd3 and the 13rd electric capacity c13；The vbus foot of described interface 70 is even
Connect one end of feeder ear vbus, one end of the 3rd electrostatic protection diode esd3 and the 13rd electric capacity c13；The d- foot of interface 70 is even
Connect the 3rd foot of the 3rd inductance l3 and one end of the first electrostatic protection diode esd1, the d+ foot of interface 70 connects the 3rd inductance l3
The 2nd foot and the second electrostatic protection diode esd2 one end；The gnd foot of interface 70, shield1 foot, shield2 foot all connect
Ground；The other end of the first electrostatic protection diode esd1, the other end of the second electrostatic protection diode esd2, the 3rd electrostatic protection
The other end of diode esd3 is all grounded；1st foot of the 3rd inductance l3 connects the dplus foot of conversion chip u4, the 3rd inductance l3
The 4th foot connect conversion chip u4 dminus foot.
Described interface 70 is usb standard interface, using usb otg line connecting interface 70 and smart mobile phone or Intelligent flat
Or the micro usb interface of the smart machine with screen display connects.If smart machine has type a usb interface, that
Can be able to be directly connected to without by usb otg line.Smart machine end is micro usb interface mostly at present, its interface
Little, in leading to use, equipment easily rocks, and connects unstable.The present embodiment adopts type a usb interface, by usb otg
Line is connected with micro usb interface smart machine or is directly connected with the smart machine with type a usb interface；
The stability of connection can be increased.
The d- foot of interface 70 and d+ foot pass through the 3rd inductance l3(common mode inductance) it is connected with conversion chip u4, externally export
Usb differential data signals (dplus, dminus) give smart mobile phone, panel computer and smart machine.Three electrostatic protection two poles
Manage as esd protection device, during preventing from using, electrostatic passes through interface 70 EVAC and works.So digital terrestrial television programs
The ts signal bit stream of signal source is converted into usb differential data signals after treatment and exports to smart machine broadcasting.
See also Fig. 1 and Fig. 8, described power module 60 includes the first power conversion unit and second source conversion is single
Unit.After interface 70 accesses the usb interface of other smart machines such as smart mobile phone or panel computer, the vbus foot of interface 70 obtains
5v vbus voltage.The supply voltage (5v vbus voltage) of the smart machine that interface 70 is transmitted by described first power conversion unit
The whole electromechanical source of 3.3v is obtained, second source converting unit obtains after described supply voltage (5v vbus voltage) blood pressure lowering after blood pressure lowering
Obtain the machine system power supply of 1.2v.
Described first power conversion unit includes blood pressure lowering chip u6, the 4th inductance l4, the 12nd resistance r12, the 13rd electricity
Resistance r13, the 14th resistance r14 and the 14th electric capacity c14；The vbus foot of vin foot connecting interface 70 of described blood pressure lowering chip u6 and
One end of 12nd resistance r12, the en foot of blood pressure lowering chip u6 connects the other end of the 12nd resistance r12；The sw of blood pressure lowering chip u6
Foot connects the out foot of blood pressure lowering chip u6, one end of the 13rd resistance r13, one end of the 14th electric capacity c14 by the 4th inductance l4
With whole electromechanics source vcc_3v3；The other end of the 13rd resistance r13 connects the fb foot of blood pressure lowering chip u6, also by the 14th electricity
Resistance r14 ground connection；The other end ground connection of the 14th electric capacity c14.
Wherein, the specification of the 4th inductance l4 is 1.5uh 1.3a, and the resistance of the 12nd resistance r12 is 220r ω, the 13rd
The resistance of resistance r13 is 200k ω, the resistance of the 14th resistance r14 is 44.2 k ω, and the specification of the 14th electric capacity c14 is 10uf
6.3v.The circuit structure of second source converting unit is identical with the first power conversion unit, unique except for the difference that some of which unit
The specification of part, so just can make both export different magnitudes of voltage.The different element of specification is: in second source converting unit with
The specification of the corresponding inductance in the 4th inductance l4 position is 1.2uh 1.48a, resistance corresponding with the 14th resistance r14 position
For 200k ω.
Based on above-described embodiment, the present invention also provides a kind of broadcasting side of dtmb ground digital TV receiving terminal equipment
Method, as shown in figure 9, described player method comprises the following steps:
When s100, power module detection smart machine insertion, the supply voltage blood pressure lowering that interface is inputted is whole electromechanical source and whole machine
System power supply is powered；
S200, antenna receive TV programme source signal, export radiofrequency signal by radio frequency low-noise amplification module High frequency amplification；
Radiofrequency signal is converted to intermediate-freuqncy signal by s300, tuner module；
S400, demodulation module export ts signal bit stream after intermediate-freuqncy signal is carried out with channel decoding and demodulation；
S500, data conversion module by ts signal bit stream be converted to usb differential data signals and by interface be transferred to intelligence set
Standby broadcasting.
In sum, a kind of dtmb ground digital TV receiving terminal equipment provided by the present invention and its player method,
Received eventually with dtmb terrestrial DTV by the use of the usb interface of smart machine (mobile phone or flat board etc.) as data communication interface
End equipment connects, and dtmb ground digital TV receiving terminal equipment can normally accept digital terrestrial television programs signal, process
After a series of conversions, output usb differential data signals are play to smart machine.User can be made to exempt from any time in the situation of no net
Expense watches digital television program, does not also interfere with the normal use of smart machine other functions；It is simple to operate, practical,
Also exempt from flow, decrease flow cost.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can
To be improved according to the above description or to convert, all these modifications and variations all should belong to the guarantor of claims of the present invention
Shield scope.
Claims (11)
1. a kind of dtmb ground digital TV receiving terminal equipment, is connected with smart machine it is characterised in that including antenna, penetrating
Frequency low noise amplification module, tuner module, demodulation module, data conversion module, power module and interface；
Described antenna receives TV programme source signal, exports radiofrequency signal by radio frequency low-noise amplification module High frequency amplification, adjusts
Radiofrequency signal is converted to intermediate-freuqncy signal by humorous module, and demodulation module exports ts code after intermediate-freuqncy signal is carried out with channel decoding and demodulation
Stream signal, ts signal bit stream is converted to usb differential data signals and is transferred to smart machine by interface by data conversion module
Play；During power module detection smart machine insertion, the supply voltage blood pressure lowering that interface is inputted is whole electromechanical source and machine system
Power supply is powered to radio frequency low-noise amplification module, tuner module, demodulation module, data conversion module.
2. dtmb ground digital TV receiving terminal equipment according to claim 1 is it is characterised in that described radiofrequency low-noise
Sound amplification module includes terminal, radio frequency amplification chip, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the first inductance
And first resistor；
1st foot of described terminal passes through rf_in foot, the 2nd foot of terminal and the 3rd foot of the first capacitance connection radio frequency amplification chip
Ground connection, antenna inserts terminal；The vcc foot of radio frequency amplification chip connects one end of first resistor, one end of the second electric capacity and first
Power end；The other end ground connection of the second electric capacity, the other end of first resistor connects one end of the first inductance；Radio frequency amplification chip
Ctrl foot connects one end of the second electric capacity, also by the 4th capacity earth；The rf_out foot of radio frequency amplification chip connects the first electricity
The other end of sense and one end of the 3rd electric capacity, the other end of the 3rd electric capacity connects tuner module.
3. dtmb ground digital TV receiving terminal equipment according to claim 2 is it is characterised in that described tuner module
Including tuning chip, the second inductance, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity and the first magnetic bead；
The lna_inp foot of described tuning chip passes through the 2nd foot of the 5th capacitance connection the second inductance, the lna_inn of tuning chip
Foot passes through the 1st foot of the 6th capacitance connection the second inductance, and the 3rd foot of the second inductance connects one end of the 8th electric capacity, the second inductance
The 4th foot ground connection, the other end of the 8th electric capacity connects the other end of the 3rd electric capacity, and the vdd_1p8 foot of tuning chip connects second
Power end；The agc foot of tuning chip, if_outn foot, if_outp foot, sda foot, scl foot are all connected with demodulation module；Tuning chip
Vdd_3p3 foot connect one end of the first power end, one end of the first magnetic bead and the 7th electric capacity, the other end of the first magnetic bead connects
Whole electromechanical source, the 7th electric capacity other end ground connection.
4. dtmb ground digital TV receiving terminal equipment according to claim 3 is it is characterised in that described tuner module
Also include protection diode and second resistance；
One end of described protection diode connects the 3rd foot of the second inductance and one end of the 8th electric capacity, protection diode another
End ground connection, one end of second resistance connects the agc foot of tuning chip, and the other end of second resistance connects demodulation module.
5. dtmb ground digital TV receiving terminal equipment according to claim 4 is it is characterised in that described demodulation module
Including demodulation chip, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance,
9th electric capacity, the tenth electric capacity and the 11st electric capacity；
The inp_i foot of described demodulation chip connects one end of the 4th resistance and one end of the tenth electric capacity, the other end of the 4th resistance
Connect the 5th power end, the other end of the tenth electric capacity connects the if_outn foot of tuning chip, the inn_i foot of demodulation chip connects
One end of 5th resistance and one end of the 11st electric capacity, the other end of the 5th resistance connects the 5th power end, the 11st electric capacity
The other end connects the if_outp foot of tuning chip, and the agc_if foot of demodulation chip connects one end of 3rd resistor；3rd resistor
The other end connects the other end of second resistance, also by the 9th capacity earth；The scl_t foot of demodulation chip connects tuning chip
Scl foot, also by the 6th resistance connect the 4th power end；The sda_t foot of demodulation chip connects the sda foot of tuning chip, also logical
Cross the 7th resistance and connect the 4th power end；The scl foot of demodulation chip connects data conversion module, connects the also by the 8th resistance
Four power ends；The sda foot of demodulation chip connects data conversion module, connects the 4th power end also by the 9th resistance；Solution aligning
The ts_d0 foot of piece, ts_d1 foot, ts_d2 foot, ts_d3 foot, ts_d4 foot, ts_d5 foot, ts_d6 foot, ts_d7 foot, ts_clk foot
It is all connected with data conversion module；The vdd12_1 foot of demodulation chip, vdd12_2 foot, vdd12_3 foot, vdd12_4 foot, vdd12_5
Foot, vdd12_6 foot are all connected with the 3rd power end；The vdd33_1 foot of demodulation chip, vdd33_2 foot, vdd33_3 foot, vdd33_4
Foot, vdd33_5 foot are all connected with the 4th power end.
6. dtmb ground digital TV receiving terminal equipment according to claim 5 is it is characterised in that described demodulation module
Also include several electric capacity the first capacitance group in parallel, the second capacitance group of several electric capacity parallel connections, the second magnetic bead, the 3rd magnetic
Pearl, the tenth resistance, the 11st resistance and the 12nd electric capacity；
One end of described second magnetic bead connects machine system power end, some in other end connection first capacitance group of the second magnetic bead
Individual one end of electric capacity in parallel and the 3rd power end, the other end ground connection of several electric capacity in parallel in the first capacitance group；3rd
Power end passes through one end, one end of the 12nd electric capacity and the 5th power end that the tenth resistance connects the 11st resistance；11st electricity
The other end of resistance connects the other end and the ground of the 12nd electric capacity；One end of 3rd magnetic bead connects whole electromechanics source, the 3rd magnetic bead
The other end connects one end of several electric capacity in parallel and the 4th power end in the second capacitance group, and in the second capacitance group, several are simultaneously
The other end ground connection of the electric capacity of connection.
7. dtmb ground digital TV receiving terminal equipment according to claim 6 is it is characterised in that described data conversion
Module includes conversion chip and memorizer；
The rdy1 foot of described conversion chip connects the ts_clk foot of demodulation chip, and the dplus foot of conversion chip and dminus foot are even
Connection interface, the scl foot of conversion chip connects the scl foot of demodulation chip and the scl foot of memorizer, and the sda foot of conversion chip connects
The sda foot of demodulation chip and the sda foot of memorizer, the pb0 foot of conversion chip connects the ts_d0 foot of demodulation chip, conversion chip
Pb1 foot connect the ts_d1 foot of demodulation chip, the pb2 foot of conversion chip connects the ts_d2 foot of demodulation chip, conversion chip
Pb3 foot connects the ts_d3 foot of demodulation chip, and the pb4 foot of conversion chip connects the ts_d4 foot of demodulation chip, the pb5 of conversion chip
Foot connects the ts_d5 foot of demodulation chip, and the pb6 foot of conversion chip connects the ts_d6 foot of demodulation chip, the pb7 foot of conversion chip
Connect the ts_d7 foot of demodulation chip, the avcc_3 foot of conversion chip connects the 6th power end.
8. dtmb ground digital TV receiving terminal equipment according to claim 7 is it is characterised in that described data conversion
Module also includes the 4th magnetic bead and the 3rd capacitance group of several electric capacity parallel connection；
One end of described 4th magnetic bead connects whole electromechanics source, and the other end of the 4th magnetic bead connects in the 3rd capacitance group several simultaneously
One end of electric capacity of connection and the 6th power end, the other end ground connection of several electric capacity in parallel in the 3rd capacitance group.
9. dtmb ground digital TV receiving terminal equipment according to claim 8 it is characterised in that described interface outer
Enclose circuit include the 3rd inductance, the first electrostatic protection diode, the second electrostatic protection diode, the 3rd electrostatic protection diode and
13rd electric capacity；
The vbus foot of described interface connects one end of feeder ear, one end of the 3rd electrostatic protection diode and the 13rd electric capacity；Connect
The d- foot of mouth connects the 3rd foot of the 3rd inductance and one end of the first electrostatic protection diode, and the d+ foot of interface connects the 3rd inductance
The 2nd foot and the second electrostatic protection diode one end；The gnd foot of interface, shield1 foot, shield2 foot are all grounded；First
The other end of electrostatic protection diode, the other end of the second electrostatic protection diode, the other end of the 3rd electrostatic protection diode
All it is grounded；1st foot of the 3rd inductance connects the dplus foot of conversion chip, and the 4th foot of the 3rd inductance connects conversion chip
Dminus foot.
10. dtmb ground digital TV receiving terminal equipment according to claim 1 is it is characterised in that described power supply mould
Block includes:
First power conversion unit, obtains whole electromechanical source after the supply voltage blood pressure lowering for the smart machine transmitting interface；
Second source converting unit, for obtaining machine system power supply after described supply voltage blood pressure lowering.
A kind of 11. player methods for realizing the dtmb ground digital TV receiving terminal equipment described in claim 1, it is special
Levy and be, comprise the steps:
During power module detection smart machine insertion, the supply voltage blood pressure lowering that interface is inputted is whole electromechanical source and machine system electricity
Source is powered；
Antenna receives TV programme source signal, exports radiofrequency signal by radio frequency low-noise amplification module High frequency amplification；
Radiofrequency signal is converted to intermediate-freuqncy signal by tuner module；
Demodulation module exports ts signal bit stream after intermediate-freuqncy signal is carried out with channel decoding and demodulation；
Ts signal bit stream is converted to usb differential data signals and is transferred to smart machine by interface and broadcasts by data conversion module
Put.
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| CN201610868796.1A CN106375818B (en) | 2016-09-30 | 2016-09-30 | A kind of DTMB ground digital TV receiving terminal equipment and its playback method |
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| CN201610868796.1A CN106375818B (en) | 2016-09-30 | 2016-09-30 | A kind of DTMB ground digital TV receiving terminal equipment and its playback method |
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| CN106375818B (en) | 2019-05-21 |
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