CN110246325A - A kind of digital infrared remote-controlled signal modulation circuit and its modulator approach - Google Patents
A kind of digital infrared remote-controlled signal modulation circuit and its modulator approach Download PDFInfo
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
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- H—ELECTRICITY
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- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
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Abstract
This application discloses a kind of digital infrared remote-controlled signal modulation circuit and its modulator approach, modulation circuit includes: clock frequency division module, counting module, modulation module, timing module and state machine；Clock frequency division module, for providing clock signal for state machine, counting module, timing module and modulation module；Counting module, for obtaining count value to clock signal-count；Modulation module, for according to count value, infrared remote-controlled signal to be modulated according to preset modulation type；Timing module obtains clocking value for the modulation time timing to modulation module；State machine, for after state machine terminates to obtain infrared remote-controlled signal process, counting module is controlled to count, timing module timing, it is also used to control the modulation that modulation module carries out infrared remote-controlled signal one frame signal according to clocking value, when solving the modulation that existing infrared remote-controlled signal carries out Software Coding, the technical issues of occupying the memory source of microcontroller, reducing microcontroller working efficiency.
Description
Technical field
The application belongs to field of communication technology more particularly to a kind of digital infrared remote-controlled signal modulation circuit and its modulation
Method.
Background technique
Infrared communication has the characteristics that miniaturization, lightweight, safety, feasibility are high, is 5-10 in transmission range therefore
It is widely applied in the point-to-point wireless data communication of rice, such as the infrared remote control of household electrical appliance.
Infrared remote control system is broadly divided into two parts: the modulation of signal and the decoding of signal.Modulation for infrared signal,
Infrared modulated program is executed by microcontroller in the prior art to realize.Although the technology achieves certain effect, but
When modulation, the internal resource (such as: timer, interruption) of microcontroller can be occupied, so that microcontroller resource scarcity, work effect
Rate is low.
Summary of the invention
In view of this, being realized this application provides a kind of digital infrared remote-controlled signal modulation circuit and its modulator approach
Modulation with Digital Logical Circuits to infrared remote-controlled signal solves the modulation that existing infrared remote-controlled signal carries out Software Coding
When, the technical issues of occupying the memory source of microcontroller, reduce microcontroller working efficiency.
The application first aspect provides a kind of digital infrared remote-controlled signal modulation circuit, comprising: clock frequency division module,
Counting module, modulation module, timing module and state machine；
The clock frequency division module, for being the state machine, the counting module, the timing module and the modulation
Module provides clock signal；
The counting module obtains count value for counting to the clock signal；
The modulation module, for according to the count value, by the infrared remote-controlled signal according to preset modulation type into
Row modulation；
The timing module obtains clocking value for the modulation time timing to the modulation module；
The state machine, for controlling the count module after state machine terminates to obtain infrared remote-controlled signal process
Block count, the timing module timing are also used to control the modulation module according to the clocking value and believe the infrared remote control
Number carry out a frame signal modulation.
Optionally, the preset modulation type is specially pulsewidth modulation.
Optionally, the modulation module, is specifically used for according to the count value, carries out NEC to the infrared remote-controlled signal
The pulsewidth modulation of infrared remote control data code.
Optionally, the clock frequency division module, also provides for carrier signal；
The modulation module is also used to the modulated infrared remote-controlled signal and the carrier signal carrying out logical AND
Operation obtains Infrared Remote-Control Sending signal.
Optionally, the state machine is also used to be adjusted to terminate by the state machine after modulation module modulation terminates
State.
Optionally, the clock frequency division module is specifically used for, and the clock signal of 50MHz is divided into 1MHz, 38KHz, 2KHz
Three kinds of clock signals, wherein the clock signal of 1MHz be state machine, counting module, modulation module clock signal, 38KHz when
Clock signal is carrier signal, and the clock signal of 2KHz is the clock signal of timing module.
Optionally, the state machine starts read data status ST1 specifically by 7 kinds of states, respectively original state ST0,
Terminate read data status ST2, generate 9ms guidance code state ST3, generates 4.5ms guidance code state ST4, data code modulation
State ST5 waits end state ST6.
The application second aspect provides a kind of IR remote controller, including digital infrared distant described in above-mentioned first aspect
Control signal modulation circuit.
The application third aspect provides a kind of modulator approach, for digital infrared remote-controlled signal described in first aspect
Modulation circuit operation or work, comprising:
When terminate obtain infrared remote-controlled signal process after, state machine control counting module to clock frequency division module provide when
Clock signal is counted, and count value is obtained, and controls modulation time timing of the timing module to modulation module, obtains clocking value；
The state machine controls modulation module, according to the clocking value and the count value to the infrared remote-controlled signal into
The modulation of one frame signal of row.
As can be seen from the above technical solutions, the embodiment of the present application has the advantage that
This application provides a kind of digital infrared remote-controlled signal modulation circuits, comprising: clock frequency division module, count module
Block, modulation module, timing module and state machine；Clock frequency division module, for being state machine, counting module, timing module and tune
Molding block provides clock signal；Counting module, for obtaining count value to clock signal-count；Modulation module, by based on
Infrared remote-controlled signal is modulated by numerical value according to preset modulation type；Timing module, for the modulation time to modulation module
Timing obtains clocking value；State machine, for controlling counting module meter after state machine terminates to obtain infrared remote-controlled signal process
Number, timing module timing are also used to control the tune that modulation module carries out infrared remote-controlled signal one frame signal according to clocking value
System.The modulation circuit of the application can be modulated infrared remote-controlled signal, and in design, which is embedded into micro-control
After device processed, as the modulation module in microcontroller dedicated for infrared remote control, programs executed by microcontroller is not needed to encode,
The efficiency for improving microcontroller occupies microcontroller when solving the modulation that existing infrared remote-controlled signal carries out Software Coding
The technical issues of memory source, reduction microcontroller working efficiency.
Detailed description of the invention
Fig. 1 is a kind of digital infrared remote-controlled signal modulation circuit structural schematic diagram in the embodiment of the present application；
Fig. 2 is the structural schematic diagram of the state machine in the embodiment of the present application；
Fig. 3 is the structural schematic diagram of the counting module in the embodiment of the present application；
Fig. 4 is the structural schematic diagram of the modulation module in the embodiment of the present application.
Specific embodiment
The embodiment of the present application provides a kind of digital infrared remote-controlled signal modulation circuit and its modulator approach, realizes use
Modulation of the Digital Logical Circuits to infrared remote-controlled signal, when solving the modulation that existing infrared remote-controlled signal carries out Software Coding,
The technical issues of occupying the memory source of microcontroller, reducing microcontroller working efficiency.
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
Referring to Fig. 1, a kind of structural schematic diagram of digital infrared remote-controlled signal modulation circuit in the embodiment of the present application.
A kind of digital infrared remote-controlled signal modulation circuit includes: clock frequency division module block1, state machine block2, meter
Digital-to-analogue block block3, modulation module block4 and timing module block5；Clock frequency division module block1, for being state machine
Block2, counting module block3, modulation module block4 and timing module block5 provide clock signal；Counting module
Block3 obtains count value for counting to clock signal；Modulation module block4 is used for according to count value, will be wait adjust
The infrared remote-controlled signal of system is modulated according to preset modulation type；Timing module block5, for modulation module block4
The timing of modulation time, obtain clocking value；State machine block2, for terminating to obtain infrared remote-controlled signal as state machine block2
After process, control counting module block3 is counted, and controls timing module block5 timing, and according to clocking value, control modulation mould
Block block4 carries out the modulation of a frame signal to infrared remote-controlled signal.
The modulation circuit of the present embodiment can be modulated infrared remote-controlled signal, in design, the modulation circuit is embedding
Enter to after microcontroller, as the modulation module in microcontroller dedicated for infrared remote control, does not need microcontroller and execute journey
Sequence encodes, and improves the efficiency of microcontroller, when solving the modulation that existing infrared remote-controlled signal carries out Software Coding, occupies micro-
The technical issues of memory source of controller, reduction microcontroller working efficiency.
The above are a kind of first embodiment of digital infrared remote-controlled signal modulation circuit provided by the embodiments of the present application, with
It is down a kind of second embodiment of digital infrared remote-controlled signal modulation circuit provided by the embodiments of the present application.
Referring to Fig. 1, the digital infrared remote-controlled signal modulation circuit in the present embodiment includes: clock frequency division module
Block1, state machine block2, counting module block3, modulation module block4 and timing module block5；Clock division mould
Block block1, for being provided for state machine block2, counting module block3, modulation module block4 and timing module block5
Clock signal；Counting module block3 obtains count value for counting to clock signal；Modulation module block4, is used for
According to count value, infrared remote-controlled signal to be modulated is modulated according to preset modulation type；Timing module block5, is used for
Modulation time timing to modulation module block4, obtains clocking value；State machine block2, for terminating as state machine block2
After obtaining infrared remote-controlled signal process, control counting module block3 is counted, and controls timing module block5 timing, and according to meter
Duration, control modulation module block4 carry out the modulation of a frame signal to infrared remote-controlled signal.
It should be noted that the clock signal of 50MHz is divided into 1MHz by clock frequency division module block1 in the present embodiment
Three kinds of clock signals of (period 1us), 38KHz, 2KHz (period 1ms).1MHz clock signal is state machine block2, counting module
The clock signal of block3, modulation module block4,38KHz clock signal are carrier signal, and 2KHz clock signal is timing mould
The clock signal of block block5.
As shown in Figure 1, entire modulation circuit is illustrated in figure 2 state machine block2 by state machine block2 coordinated control
Structural schematic diagram, wherein the output of state machine block2 is ST0-ST6 totally 7 states, original state ST0, starts to read outer
Portion data mode ST1 terminates reading external data state ST2, generates 9ms guidance code state ST3, generates 4.5ms guidance code shape
State ST4, data code modulation state ST5 wait end state ST6.After the process of reading infrared remote control signal, enter
The state of guidance code is generated this means that the beginning modulated, counting module block3, timing module block5 and modulation module
Block4 respectively carries out corresponding operation.
As shown in Figure 1, the state that counting module block3 is exported by the end state_in [2..0] input state machine block2
Signal control.Counting module block3 is counted in the state of state ST3, ST4, ST5.Under ST3 state, the counter
Count value is 9000, and count value is 4500 under ST4 state, and the count value under ST5 state is according to modulation module block4's
Shift outputs determine that respectively count value is 1125 and 2250, give these count values to modulation module block4 and are used to produce
The time width of raw shift pulse.
It is illustrated in figure 3 the circuit structure diagram of counting module block3, the control logic unit of the module has: 16 data
Size comparator lessThan0, lessThan1, lessThan2, lessThan3 and 16 equality comparator Equal0,
Equal1, Equal2,16 adder Add0, two inputs and door AND0, AND1, three inputs and door AND2, AND3, three inputs or
Door OR0, four inputs or door OR1, two 16 data selectors MUX21_1, MUX21_2, realize 16 by above-mentioned circuit structure
The counting and reset control of position counting module block3.
Three inputs or the input of door OR0 are separately connected the output of equality comparator Equal0, Equal1, Equal2.It is equal
The input terminal A [2..0] of comparator Equal0, Equal1, Equal2 all connection status selection signal state_in [2..0], it is defeated
Enter to hold B [2..0] to input 3 ' b011 of constant, 3 ' b100,3 ' b101 respectively.It is found that when state_in [2..0] is respectively 3 '
When b011,3 ' b100,3 ' b101 (i.e. state ST3, ST4, ST5), three inputs or door OR0 export high level 1, and as 16 two
The selection signal SEL for selecting a data selector MUX21_1, as SEL=1, which selects device to select DATAB end data, DATAB
End data comes from adder Add0, at this point, if when the SEL=0 of 16 alternative data selector MUL21_2, counting module
Block3 is counted.
When being in ST3 (state_in [2..0]=3 ' b011) state, if the count value of counting module block3 is greater than
When 9000, Equal0 export high level 1, at this time three input with door AND1 export high level 1, then MUX21_2 select end SEL for
High level, the output end of MUX21_2 select DATAB, because the end DATAB connects 16 ' h0000 of constant, then counting module at this time
Block3 [5..0] resets.
When being in ST4 (state_in [2..0]=3 ' b100) state, if the count value of counting module block3 is greater than
When 4500, Equal1 export high level 1, at this time two input with door AND0 export high level 1, then MUX21_2 select end SEL for
High level, the output end of MUL21_2 select DATAB, because the end DATAB connects 16 ' h0000 of constant, then counting module at this time
Block3 [5..0] resets.
When being in ST5 (state_in [2..0]=3 ' b101) state, shifted data input terminal be less than comparator
The input of lessThan3 and state input state_in [2..0] together as three inputs and door AND2, the output connection of AND2
Four inputs or the input of door OR1.When in ST5, and shift_out=1, and the count value of counter counting module block3 is greater than
When 2250, with door AND2 output 1, then or door OR1 exports the end SEL that 1, OR1 output connects 16 data selector MUX21_2,
As SEL=1, the output end of MUX21_2 selects DATAB input terminal, and because DATAB input terminal is constant 0, this hour counter is realized
Reset operation.
It should be noted that the modulation circuit in the present embodiment also has the emission function of remote signal, i.e. the present embodiment
Middle clock frequency division module block1, also provides for carrier signal；Modulation module block4, being also used to will be modulated infrared distant
It controls signal and carrier signal carries out logic and operation, obtain Infrared Remote-Control Sending signal.
It should be noted that timing module block5 is a frame infrared remote coding duration 108ms counter module.
Further, state machine block2 is also used to after modulation module block4 modulation terminates, by state machine block2
It is adjusted to end state.
It should be noted that data modulation type be it is diversified, data modulation structure be similarly varied
, the data modulation type in the present embodiment is pulsewidth modulation, and the structure of specific modulation module block4 is shown in Figure 4.
It is illustrated in figure 4 the structural schematic diagram of the modulation module block4 in the present embodiment, in the present embodiment, modulation module
Block4 receives the state control signal of state machine block2 output.Under ST2 state, state machine block2 is latched infrared
Remote signal is encoded (data transformation) according to the coded format of NEC infrared remote control data code and user code, and is latched into tune
Molding block register.Under ST4 state, the data being latched in are sent to shift register.Shift_ will be latched under ST5 state
16 data of data [15..0] carry out data modulation according to NEC infrared coding format.The wave of modulation module block4 output end
Shape is exactly the pulse width signal modulated, the pulse width signal by with door AND5 and externally input carrier signal phase with obtain red
Outer remote-transmitter signal, and exported from the end modulated_data_out.
The shift register of the present embodiment be 32 bit shift registers, data input pin connect 32 alternative data
The output of selector MUX21_5.The output of the data terminal SEL connection equality comparator Equal2 of MUX21_5, Equal2 comparator
Input be 3 ' h4 of condition input signals state_in [2..0] and constant respectively, when state_in [2..0] value and constant 3 '
When h4 (i.e. state_in [2..0]=3 ' h4), comparator output 1, then the SEL=1 of MUX21_5, the output end of MUX21_5 are selected
DATAB is selected, at this point, the data for being latched in modulation module register are realized the data dress of shift register to shift register
It carries.
When the data of MUX21_5 select end SEL=0, DATAA end data is selected, the end DATAA connects 32 alternative numbers
According to the output end of selector MUX21_6.The output of the selection end SEL connection equality comparator Equal4 of MUX21_6.Equal4 pairs
State machine inputs state_in [2..0] compared with 3 ' h5 of constant, as state_in [2..0]=3 ' h5 (in ST5 state),
Equal4 output 1, then the SEL=1 of MUX21_6, the MUX21_6 output end selection end DATAB input, and DATAB end data is given
Shift register, because DATAB end data is the 32nd logical AND with 1 ' h0 of the DATAA end data from shift register,
32nd data are become 0, realize that shift register highest order in displacement mends 0 operation.
The working principle of entire modulation module are as follows:
State machine enters original state ST0 after reset, when externally input starting transmitting signal is effective, is transferred to ST1 shape
State, reading infrared remote control signal, and infrared remote-controlled signal is latched into input data register, and in next rising edge clock
Enter ST2 state afterwards, terminates to read data in ST2 state, then go to ST3 state.
Under ST3 state, starting timing module block5 (block5) starts timing, under ST3 state, counting module
Block3 gives state machine block2 and modulation module block4 by data/address bus, works as meter to 1MHz clock count, count value
When to 9000 (just 9ms), counting module block3 clear 0, and go to ST4 state.
Under ST4 state, counting module block3 is equally to 1MHz clock count, (i.e.: when counting down to 4500
4.5ms), clear 0 counting module block3, state machine go to ST5 state.
Under ST5 state, counting module block3 is equally to 1MHz clock count, when the displacement of modulation module block4 is defeated
When outlet exports low level, counting module block3's count down to 1125 (i.e. 1.125ms), counting module block3 clear 0；Work as shifting
When the output end output high level of position, counting module block3's count down to 2250 (i.e. 2.25ms), counting module block3 clear 0.
The primary output a data of the every displacement of Shift outputs, shift count counter adds 1, and gives the number of displacement to state machine
Block2, when shift count reaches 32, state machine machine enters ST6 state, and a frame infrared signal is waited to terminate, when getting
When the infrared end signal of one frame, modulation module process terminates, and system is returned to ST0 state, prepares next modulation module.
Wherein, shift count counter is used to count the number of shift pulse rising edge, and each shift pulse rising edge adds 1.
It indicates that 32 shift registers all remove 32 internal data from s Shift outputs when meter is to 33, completes once
The modulation of 32 data.
The clock triggering end in contact hair device shift pulse of shift count counter (shift_cnt [5..0] in Fig. 1)
Output, the output of 6 alternative data selector MUX21_8 of input terminal D connection, the end SEL of MUX21_8 connects equality comparator
The output of Equal3, when the input terminal A connection status of Equal3 inputs state_in [2..0], the end B is 3 ' h0 of constant, when
When state_in [2..0]=3 ' h0 (state ST0), Equal3 exports high level 1, i.e. the SEL=1 of MUX21_8 is then selected
DATAB end data realizes that counter resets under ST0 state because of DATAB=6 ' h0.Not in ST0, SEL=0, MUX21_
The 8 selection end DATAA inputs, the end DATAA connects 6 alternatives and connects data selector MUX21_9 output end.The SEL of MUX21_7
The output of end connection equality comparator Equal4, as state_in [2..0]=3 ' h5 (state ST5), the high electricity of Equal4 output
Flat 1, then the SEL=1 of MUX21_9, selects DATAB input, and displacement time is realized in the output of DATAB connection adder ADD0 at this time
Counter adds 1 operation.
The wherein data terminal D of the data register (latch_in_data [31..0] as shown in figure 1) of state machine block2
32 alternative data selector MUX21_3 output ends are connected, the SEL termination of MUX21_3 resets reset input terminal, works as reset
When=0, SEL=1, then MUX21_3 selects the input of the end DATAB, because of DATAB=32 ' h0000000, latch reset at this time.When
When reset=1, SEL=0, MUX21_3 select the input of the end DATAA, and the end DATAA connects 32 alternative data selectors
The output of MUX21_4.The output of the end the data select signal SEL connection equality comparator Equal1 of MUX21_4, Equal1 compare
The input of device is 3 ' h2 of condition input signals state_in [2..0] and constant respectively, when the value and constant of state_in [2..0]
When 3 ' h2 (i.e. state_in [2..0]=3 ' h2), comparator exports 1, then the SEL=1 of MUX21_4, the output end of MUX21_4
Select DATAB.Data input pin data_in [15..0] is through data conversion (atch_data_in [15..0], latch_data_
In [7..0], latch_data_in [15..8] negate after respectively with latch_data_in [7..0], latch_data_in
[15..8] merging is combined into 32 data, and inputs as DATAB, so when in state ST2 (state_in [2..0]=3 '
H2), the SEL=1 of MUX21_4, and the end DATAB of MUX21_4 is selected when reset=0, at this time in the decline of clock clk_1us
Along DATAB end data is latched into latch_in_data [31..0], the latch input of data is realized.When reset=1 is not (multiple
Position) and, not at ST2 state (state_in is not equal to 3 ' h2), the SEL of MUX21_4, MUX21_3 are 0, and output all selects
DATAA end data, because the end DATAA of MUX21_4 connects data latches, so latch is in each clk_1us clock at this time
Failing edge realizes that data are kept.
The modulation circuit of the present embodiment can be modulated infrared remote-controlled signal, in design, the modulation circuit is embedding
Enter to after microcontroller, as the modulation module in microcontroller dedicated for infrared remote control, does not need microcontroller and execute journey
Sequence encodes, and improves the efficiency of microcontroller, when solving the modulation that existing infrared remote-controlled signal carries out Software Coding, occupies micro-
The technical issues of memory source of controller, reduction microcontroller working efficiency.
The above are a kind of second embodiment of digital infrared remote-controlled signal modulation circuit provided by the embodiments of the present application, with
It is down a kind of embodiment of IR remote controller provided by the embodiments of the present application.
IR remote controller in the present embodiment includes the coding circuit of the infrared remote-controlled signal of above-mentioned any embodiment.
The modulation circuit of the present embodiment can be modulated infrared remote-controlled signal, in design, the modulation circuit is embedding
Enter to after microcontroller, as the modulation module in microcontroller dedicated for infrared remote control, does not need microcontroller and execute journey
Sequence encodes, and improves the efficiency of microcontroller, when solving the modulation that existing infrared remote-controlled signal carries out Software Coding, occupies micro-
The technical issues of memory source of controller, reduction microcontroller working efficiency.
The above are a kind of embodiments of IR remote controller provided by the embodiments of the present application, and the following are the embodiment of the present application offers
A kind of modulator approach embodiment.
One of the present embodiment modulator approach, comprising:
When terminate obtain infrared remote-controlled signal process after, state machine control counting module to clock frequency division module provide when
Clock signal is counted, and count value is obtained, and controls modulation time timing of the timing module to modulation module, obtains clocking value；
State machine controls modulation module, carries out the tune of a frame signal to infrared remote-controlled signal according to clocking value and count value
System.
The modulation circuit of the present embodiment can be modulated infrared remote-controlled signal, in design, the modulation circuit is embedding
Enter to after microcontroller, as the modulation module in microcontroller dedicated for infrared remote control, does not need microcontroller and execute journey
Sequence encodes, and improves the efficiency of microcontroller, when solving the modulation that existing infrared remote-controlled signal carries out Software Coding, occupies micro-
The technical issues of memory source of controller, reduction microcontroller working efficiency.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of digital infrared remote-controlled signal modulation circuit characterized by comprising clock frequency division module, counting module, tune
Molding block, timing module and state machine；
The clock frequency division module, for being the state machine, the counting module, the timing module and the modulation module
Clock signal is provided；
The counting module obtains count value for counting to the clock signal；
The modulation module, for according to the count value, by infrared remote-controlled signal to be modulated according to preset modulation type into
Row modulation；
The timing module obtains clocking value for the modulation time timing to the modulation module；
The state machine, for controlling the count module after state machine terminates to obtain the infrared remote-controlled signal process
Block count, the timing module timing are also used to control the modulation module according to the clocking value and believe the infrared remote control
Number carry out a frame signal modulation.
2. digital infrared remote-controlled signal modulation circuit according to claim 1, which is characterized in that the preset modulation class
Type is specially pulsewidth modulation.
3. digital infrared remote-controlled signal modulation circuit according to claim 2, which is characterized in that the modulation module,
Specifically for carrying out the pulsewidth modulation of NEC infrared remote control data code to the infrared remote-controlled signal according to the count value.
4. digital infrared remote-controlled signal modulation circuit according to claim 1, which is characterized in that the clock division mould
Block also provides for carrier signal；
The modulation module is also used to the modulated infrared remote-controlled signal and the carrier signal carrying out logical AND fortune
It calculates, obtains Infrared Remote-Control Sending signal.
5. digital infrared remote-controlled signal modulation circuit according to claim 1, which is characterized in that the state machine, also
For after the modulation module modulation terminates, the state machine to be adjusted to end state.
6. digital infrared remote-controlled signal modulation circuit according to claim 4, which is characterized in that the clock division mould
Block is specifically used for, and the clock signal of 50MHz is divided into tri- kinds of clock signals of 1MHz, 38KHz, 2KHz, wherein the clock letter of 1MHz
Number for state machine, counting module, modulation module clock signal, the clock signal of 38KHz is carrier signal, and the clock of 2KHz is believed
Number be timing module clock signal.
7. digital infrared remote-controlled signal modulation circuit according to claim 1, which is characterized in that the state machine is specific
By 7 kinds of states, respectively original state ST0, start read data status ST1, terminate read data status ST2, generates 9ms and draw
Leading code state ST3 generates 4.5ms guidance code state ST4, data code modulation state ST5, waits end state ST6.
8. a kind of IR remote controller, which is characterized in that including digital infrared remote control described in any one of claims 1 to 7
Signal modulation circuit.
9. a kind of modulator approach is transported for digital infrared remote-controlled signal modulation circuit described in any one of claims 1 to 7
Row or work characterized by comprising
After terminating to obtain infrared remote-controlled signal process, state machine, which controls counting module, believes the clock that clock frequency division module provides
It number is counted, obtains count value, and control modulation time timing of the timing module to modulation module, obtain clocking value；
The state machine controls modulation module, carries out one to the infrared remote-controlled signal according to the clocking value and the count value
The modulation of frame signal.
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