CN109802739A - Broadcast modulation method and device - Google Patents
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- CN109802739A CN109802739A CN201910089993.7A CN201910089993A CN109802739A CN 109802739 A CN109802739 A CN 109802739A CN 201910089993 A CN201910089993 A CN 201910089993A CN 109802739 A CN109802739 A CN 109802739A
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Abstract
The present embodiments relate to digital broadcasting frequency modulation technology fields, specifically, it is related to a kind of broadcast modulation method and device, this method isolates echo signal using bandpass filter from original signal, the first signal component and second signal component are filtered using low-pass filter, it is then based on echo signal, first signal component and second signal component integrate to obtain integrated signal and extract the first setting signal in integrated signal and the second setting signal is exported, so, both it realizes and echo signal is effectively treated, reduce the cost of hardware circuit again, and then it ensure that the popularization and use of CDR broadcast transmitter.
Description
Technical field
The present embodiments relate to digital broadcasting frequency modulation technology field, in particular to a kind of broadcast modulation method and
Device.
Background technique
Fusion digital radio (Convergent Digital Radio, CDR) is the frequency modulation after simulated television digitlization
The new technical standard of digitization of broadcasting.CDR uses Digital Audio Coding Technology (the Digital Rise of independent research
Audio, DRA), more audio programs can be transmitted on the frequency point of analog fm broadcast, analog signal sum number may be implemented
Emit while word signal, in addition, the transmission power of digital signal is lower, anti-interference is stronger, CDR is wide wireless in centre at present
Start practical application in digitlization covering engineering.
Radio data system (Radio Data System, RDS) is a kind of data industry proposed by European Broadcasting Union
Business, it is therefore an objective to display and control information are provided for the radio station of 87.5~107.9FM frequency range, to improve frequency modulation(PFM) (Frequency
Modulation, FM) receiver function, keep the operation in the radio station FM more friendly.
Nowadays, in order to make full use of modulation frequency resource, f-m multiplex technology in analog fm broadcast radiated, be based on FM
It transmits very widely used in emergent broadcast and high-speed transit broadcast.Install or replace successively can be in frequency modulation for various regions in recent years
Frequency range carries out digital and analogue signals with the CDR broadcast transmitter broadcast, but the presence of RDS signal affect CDR broadcast transmitter into one
Step is promoted and is used.
Summary of the invention
In view of this, the present invention provides a kind of broadcast modulation method and devices.
The embodiment of the invention provides a kind of broadcast modulation methods, are applied to electronic equipment, which comprises
Original signal is received, wherein including left channel signals, right-channel signals and echo signal in the original signal；
The echo signal is isolated from the original signal using bandpass filter；
Parsing obtains the left channel signals and right-channel signals for including in the original signal, according to the L channel being resolved to
Signal and right-channel signals calculate the first signal component and second signal component；
First signal component and the second signal component are filtered using low-pass filter；
To the echo signal isolated and complete the first signal component of filtering and second signal component integrated with
Integrated signal is obtained, the first setting signal and the second setting signal for including in the integrated signal are extracted, will extracted
One setting signal and the second setting signal are exported.
Optionally, the centre frequency of the bandpass filter is 57Khz, and the passband width of the bandpass filter is
8Khz。
Optionally, using bandpass filter after the step of isolating the echo signal in the original signal, institute
State method further include:
The echo signal is inputted into automatic gain controller；
The automatic gain controller is set to judge whether the amplitude of the echo signal is located in setting amplitude section, if institute
It states amplitude to be not in the setting amplitude section, is adjusted the automatic gain controller to gain, until described
The amplitude of echo signal is located in the setting amplitude section.
Optionally, the first signal component and second signal are calculated according to the left channel signals and right-channel signals that are resolved to
The step of component, comprising:
Obtain the amplitude of the left channel signals and the amplitude of the right-channel signals；
Using the half of the sum of the amplitude of the amplitude of the left channel signals and the right-channel signals as first letter
The amplitude of number component；
Using the half of the amplitude of the left channel signals and the absolute value of the difference of the amplitude of the right-channel signals as institute
State the amplitude of second signal component.
Optionally, the method also includes:
Preemphasis processing is carried out to first signal component and the second signal component.
Optionally, the step first signal component and the second signal component being filtered using low-pass filter
Suddenly, comprising:
First time filtering is carried out to first signal component and the second signal component using the first low-pass filter,
To filter out the echo signal being present in first signal component and the second signal component；
Using the second low-pass filter to completing the first signal component of filtering for the first time and second signal component carries out the
Secondary filtering.
Optionally, the integrated signal integrates to obtain by following formula:
W=M+S*sin 38k*t+sin19*t+RDS*sin57*t
Wherein,
For integrated signal, M is the first signal component, and S is second signal component, and RDS is echo signal.
Optionally, the step of extracting the first setting signal and the second setting signal that include in the integrated signal, comprising:
The first setting signal for including in the integrated signal and the second setting letter are extracted using Coordinate Rotation Digital algorithm
Number.
Optionally, the step of the first setting signal extracted and the second setting signal being exported, comprising:
The first obtained setting signal will be extracted and the second setting signal is converted to analog signal and exports.
The embodiment of the invention also provides a kind of broadcast modulation devices, are applied to electronic equipment, and described device includes:
Signal receiving module, for receiving original signal, wherein including left channel signals, right channel in the original signal
Signal and echo signal；
Bandpass filtering modules block, for isolating the echo signal from the original signal using bandpass filter；
Signal component computing module obtains the left channel signals for including in the original signal and right channel letter for parsing
Number, the first signal component and second signal component are calculated according to the left channel signals and right-channel signals that are resolved to；
Low-pass filtering module, for using low-pass filter to first signal component and the second signal component into
Row filtering；
FM module, for the first signal component and second signal point to the echo signal and completion filtering isolated
Amount is integrated to obtain integrated signal, and the first setting signal and the second setting signal for including in the integrated signal are extracted,
The first setting signal extracted and the second setting signal are exported.
The embodiment of the invention also provides a kind of electronic equipment, including memory, processor and storage are on a memory
And the computer program that can be run on a processor, the processor realize above-mentioned broadcast tune when executing the computer program
Frequency method.
The embodiment of the invention also provides a kind of computer readable storage medium, the readable storage medium storing program for executing includes computer
Program, the electronic equipment computer program controls the readable storage medium storing program for executing when running where execute above-mentioned broadcast modulation side
Method.
Beneficial effect
Broadcast modulation method and device provided in an embodiment of the present invention is isolated from original signal using bandpass filter
Echo signal is filtered the first signal component and second signal component using low-pass filter, be then based on echo signal,
First signal component and second signal component integrate to obtain integrated signal and extract the first setting signal in integrated signal and
Two setting signals are exported, and echo signal is effectively treated in this way, not only realizing, but also reduce the cost of hardware circuit,
And then it ensure that the popularization and use of CDR broadcast transmitter.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the block diagram of a kind of electronic equipment provided by the embodiment of the present invention.
Fig. 2 is a kind of flow chart of broadcast modulation method provided by the embodiment of the present invention.
Fig. 3 is a kind of schematic diagram of signal flow provided by the embodiment of the present invention.
Fig. 4 is a kind of signal spectrum figure provided by the embodiment of the present invention.
Fig. 5 is a kind of module frame chart of broadcast modulation device provided by the embodiment of the present invention.
Icon:
10- electronic equipment；11- memory；12- processor；13- network module；14- bandpass filter；15- automatic gain
Controller；16- signal component calculator；The first low-pass filter of 17-；The second low-pass filter of 18-；19- accumulator；
20- broadcast modulation device；21- signal receiving module；22- bandpass filtering modules block；23- signal component computing module；
24- low-pass filtering module；25- FM module.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment only
It is a part of the embodiments of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings
The component of embodiment can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
Inventor further investigation reveals that, when CDR broadcast transmitter is installed or replaced, some stations can encounter former insert
The RDS signal broadcast is needed while being translated, on the one hand, the driver difference of current most of CDR broadcast transmitters supports RDS signal
Insertion on the other hand support the driver of RDS signal insertion to need to increase complicated hardware circuit, this is to a certain extent
Affect further genralrlization and the use of CDR broadcast transmitter.
Defect present in the above scheme in the prior art, is that inventor is obtaining after practicing and carefully studying
As a result, therefore, the solution that the discovery procedure of the above problem and the hereinafter embodiment of the present invention are proposed regarding to the issue above
Scheme all should be the contribution that inventor makes the present invention in process of the present invention.
Based on the studies above, the embodiment of the invention provides a kind of broadcast modulation method and devices, can either be based on band logical
Filter and low-pass filter are effectively treated echo signal, and can reduce the cost of hardware circuit, and then guarantee CDR
The popularization and use of broadcast transmitter.
Fig. 1 shows the block diagram of a kind of electronic equipment 10 provided by the embodiment of the present invention.The embodiment of the present invention
In electronic equipment 10 have data storage, transmission, processing function, as shown in Figure 1, electronic equipment 10 include: memory 11, place
Manage device 12, network module 13 and broadcast modulation device 20.
It is directly or indirectly electrically connected between memory 11, processor 12 and network module 13, to realize the biography of data
Defeated or interaction.It is electrically connected for example, these elements can be realized from each other by one or more communication bus or signal wire.
Broadcast modulation device 20 is stored in memory 11, the broadcast modulation device 20 includes at least one can be with software or firmware
(firmware) form is stored in the software function module in the memory 11, and the processor 12 is stored in by operation
The broadcast modulation device 20 in software program and module, such as the embodiment of the present invention in memory 11, thereby executing various
Functional application and data processing, i.e. broadcast modulation method in the realization embodiment of the present invention.
Wherein, the memory 11 may be, but not limited to, random access memory (Random Access Memory,
RAM), read-only memory (Read Only Memory, ROM), programmable read only memory (Programmable Read-Only
Memory, PROM), erasable read-only memory (Erasable Programmable Read-Only Memory, EPROM),
Electricallyerasable ROM (EEROM) (Electric Erasable Programmable Read-Only Memory, EEPROM) etc..
Wherein, memory 11 is for storing program, and the processor 12 executes described program after receiving and executing instruction.
The processor 12 may be a kind of IC chip, the processing capacity with data.Above-mentioned processor 12
It can be general processor, including central processing unit (Central Processing Unit, CPU), network processing unit
(Network Processor, NP) etc..It may be implemented or execute each method, step disclosed in the embodiment of the present invention and patrol
Collect block diagram.General processor can be microprocessor or the processor is also possible to any conventional processor etc..
Network module 13 is used to establish the communication connection between electronic equipment 10 and other communication terminal devices by network,
Realize the transmitting-receiving operation of network signal and data.Above-mentioned network signal may include wireless signal or wire signal.
It is appreciated that structure shown in FIG. 1 is only to illustrate, electronic equipment 10 may also include it is more than shown in Fig. 1 or
Less component, or with the configuration different from shown in Fig. 1.Each component shown in Fig. 1 can using hardware, software or its
Combination is realized.
The embodiment of the present invention also provides a kind of computer readable storage medium, and the readable storage medium storing program for executing includes computer journey
Sequence.Electronic equipment 10 computer program controls the readable storage medium storing program for executing when running where executes following broadcast modulation side
Method.
Fig. 2 shows a kind of flow charts of broadcast modulation method provided by the embodiment of the present invention.The method is related
Method and step defined in process is applied to electronic equipment 10, can be realized by the processor 12.It below will be to shown in Fig. 2
Detailed process is described in detail:
Step S21 receives original signal.
Fig. 3 is please referred to, original signal includes left channel signals L, right-channel signals R and echo signal RDS.It can manage
Solution, left channel signals L, right-channel signals R and echo signal RDS Mixed design are into electronic equipment 10.
Step S22 isolates echo signal using bandpass filter from original signal.
Fig. 4 is please referred to, it has been investigated that, the frequency spectrum of echo signal RDS is located in the range of 57Khz, and bandwidth is
4.8Khz, in order to isolate the echo signal RDS in original signal, need using bandpass filter 14 by echo signal RDS with
The left channel signals L and right-channel signals R of low frequency are separated.In the present embodiment, the centre frequency of bandpass filter 14 is
57Khz, to guarantee allowance, the passband width of bandpass filter 14 is 8Khz, passband ripple 0.02dB, and stopband attenuation is greater than
50dB。
Fig. 3 is please referred to, after original signal passes through bandpass filter 14, output is echo signal RDS, in reality
In the situation of border, the amplitude of echo signal RDS is changed greatly, can if directly carrying out subsequent processing to the echo signal RDS isolated
Situations such as clipping, distortion can occur.It therefore, can be using automatic gain controller to mesh after isolating echo signal RDS
Mark signal RDS is handled.
Automatic gain controller (automatic gain control, AGC) can according to the amplitude of echo signal RDS from
The dynamic dynamic adjustment for realizing gain.For example, AGC can judge whether the amplitude of echo signal RDS is located in setting amplitude section,
If the amplitude of echo signal RDS be not at setting amplitude section in, AGC can adjust gain, with realize to echo signal RDS
Amplitude adjustment.Wherein, the amplitude of echo signal RDS, which is not in setting amplitude section, is divided into two kinds of situations:
1) amplitude of echo signal RDS does not reach setting amplitude section, and AGC tunes up gain to realize to target at this time
The amplification of signal RDS amplitude.
2) amplitude of echo signal RDS is more than setting amplitude section, and the amplitude of echo signal RDS can be limited at this time, because
This, gain is turned down and is limited to avoid echo signal RDS by AGC.
It is appreciated that AGC carries out dynamic adjustment to gain according to the amplitude of echo signal RDS, it can guarantee echo signal
The amplitude of RDS is located in setting amplitude section, and then avoids the distortion of echo signal RDS.Multiply compared to using traditional having
The infinite impulse response filter or finite impulse response filter of musical instruments used in a Buddhist or Taoist mass are detected and are adjusted to the amplitude of RDS signal,
It can be significantly reduced costs using AGC, avoid the waste of resource.
Step S23, parsing obtains the left channel signals and right-channel signals for including in original signal, according to the left side being resolved to
Sound channel signal and right-channel signals calculate the first signal component and second signal component.
In the present embodiment, the first signal component is M, and second signal component is S, please refers to Fig. 3, can be using letter
Number component calculator 16 calculates the first signal component M and second signal component S.Specifically, the amplitude of the first signal component M is equal to
The amplitude of the half of the amplitude of left channel signals L and the sum of the amplitude of right-channel signals R, second signal component S is equal to L channel
The half of the absolute value of the difference of the amplitude of signal L and right-channel signals R.
It is possible to further carry out preemphasis processing to the first signal component for M and second signal component S, wherein carry out
The reason of preemphasis processing, is as follows:
In the audio of language or music class, the spectrum component amplitude very little of high band, this makes in frequency modulation mid-high voice frequency
Component modulation index very little, so that the signal-to-noise ratio for causing signal to transmit reduces.In addition, the noise of frequency modulation broadcasting is in the defeated of receiver
Noise characteristic is had a generally triangular shape in out: closer to high band, output noise is bigger, and frequency modulation signal-to-noise improvement factor is smaller, therefore,
In the signal-to-noise ratio very little that high band receiver output end obtains.If accessing the filtering of decaying radio-frequency component in receiver output end
Device can then reduce noise, improve signal-to-noise ratio, but this mode can make the radio-frequency component in modulated signal be attenuated, so that
The fidelity that cannot obtain modulated signal restores, and can be M and second signal point to the first signal component to overcome this disadvantage
It measures S and carries out preemphasis processing to improve the above problem.
Preemphasis processing refers in advance in the radio-frequency component of beginning (signal transmitting terminal) enhancing signal, is existed with compensating high fdrequency component
Excessive decaying in transmission process, preemphasis processing does not have an impact to noise, therefore can effectively improve output signal-to-noise ratio.
Fig. 4 is please referred to, the first signal component is that M is the part 30hz~15Khz in baseband signal, second signal component
It is the part 23Khz~53Khz in baseband signal for S.
Step S24 is filtered the first signal component and second signal component using low-pass filter.
Fig. 3 is please referred to, in the present embodiment, successively using the first low-pass filter and the second low-pass filter to the
One signal component M and second signal component L are filtered.
Due to being mixed with echo signal RDS in the first signal component M and second signal component S, it is therefore desirable to low using first
Bandpass filter carries out first time filtering, to filter out the target RDS being present in the first signal component M and second signal component S
Signal, if the image frequency that directly progress 15Khz low-pass filtering will lead to echo signal RDS can not filter out completely, to produce
Raw interference.Therefore, the passband of the first low-pass filter selected in the present embodiment is 15Khz, stopband 36Khz, passband ripple
Less than 0.1dB, stopband attenuation is greater than 60dB, so, it is possible to will be present in the first signal component M and second signal component S
Echo signal RDS is filtered out completely, does not have remaining image frequency.
Since the effective spectrum range of voice signal is 30hz~15Khz, the audio human ear more than 15Khz can not be perceived,
Therefore it needs to filter out the radio-frequency component of 15Khz or more, in the present embodiment, the second low-pass filter is 15Khz low pass
Filter.
Step S25, to the echo signal isolated and complete filtering the first signal component and second signal component into
Row integral extracts the first setting signal and the second setting signal for including in integrated signal, will extract to obtain integrated signal
The first setting signal and the second setting signal exported.
Fig. 3 is please referred to, the echo signal RDS exported using accumulator to automatic gain controller and the second low pass filtered
The the first signal component M and second signal component S of wave device output carry out Integral Processing, and integral formula is as follows:
W=M+S*sin 38k*t+sin 19*t+RDS*sin 57*t
Wherein,
For integrated signal, M is the first signal component, and S is second signal component, and RDS is echo signal.
Further, after completing integral, using Coordinate Rotation Digital algorithm (Coordinate Rotation
Digital Computer, CORDIC) extract integrated signal in the first setting signal and the second setting signal, in the present embodiment
In, the first setting signal is the road I signal, and the second setting signal is the road Q signal.
Further, the road the I signal extracted and the road Q signal are converted to by analog signal using analog-digital converter and carried out
Output.
It is appreciated that broadcast modulation method provided by the present embodiment can be based on bandpass filtering modules block to echo signal
RDS, which is effectively separated and is based on AGC, carries out amplitude adjusting, additionally it is possible to be based on the first low-pass filter and the second low-pass filter
First signal component and second signal component are filtered, wherein bandpass filter, AGC, the first low-pass filter and second
The resource that low-pass filter occupies is less, and hardware circuit and equipment without increasing additional only only used by taking vivado as an example
Any BRAM resource is not used in 2 DSP units, realizes in logic upper simple and convenient, it is easy to accomplish.
Further, real using digital filter (bandpass filter, the first low-pass filter and the second low-pass filter)
The extraction and insertion of existing echo signal RDS, it is smaller compared to traditional hardware circuit method change, it is only necessary to which that software program is carried out
Upgrading can support the insertion of echo signal RDS, and the RDS signal newly increased will not influence electronic equipment 10 and CDR broadcast
The frequency modulation function of transmitter will not have an impact the driver of CDR broadcast transmitter, so as to guarantee CDR broadcast transmission
The further genralrlization of machine and use.
On the basis of the above, as shown in figure 5, the embodiment of the invention provides a kind of broadcast modulation device 20, the broadcast
Frequency modulation device 20 includes: signal receiving module 21, bandpass filtering modules block 22, signal component computing module 23, low-pass filtering module
24 and FM module 25.
Signal receiving module 21, for receiving original signal, wherein including left channel signals, right sound in the original signal
Road signal and echo signal.
Since signal receiving module 21 is similar with the realization principle of step S21 in Fig. 2, do not illustrate more herein.
Bandpass filtering modules block 22, for isolating the echo signal from the original signal using bandpass filter.
Since bandpass filtering modules block 22 is similar with the realization principle of step S22 in Fig. 2, do not illustrate more herein.
Signal component computing module 23 obtains the left channel signals for including in the original signal and right channel for parsing
Signal calculates the first signal component and second signal component according to the left channel signals and right-channel signals that are resolved to.
Since signal component computing module 23 is similar with the realization principle of step S23 in Fig. 2, do not say more herein
It is bright.
Low-pass filtering module 24, for using low-pass filter to first signal component and the second signal component
It is filtered.
Since low-pass filtering module 24 is similar with the realization principle of step S24 in Fig. 2, do not illustrate more herein.
FM module 25, for the first signal component and second signal to the echo signal and completion filtering isolated
Component is integrated to obtain integrated signal, and the first setting signal for including in the integrated signal and the second setting letter are extracted
Number, the first setting signal extracted and the second setting signal are exported.
Since FM module 25 is similar with the realization principle of step S25 in Fig. 2, do not illustrate more herein.
To sum up, broadcast modulation method and device provided by the embodiment of the present invention, can either be based on bandpass filter and low
Bandpass filter is effectively treated echo signal, and can reduce the cost of hardware circuit, and then guarantees CDR broadcast transmitter
Popularization and use.
In several embodiments provided by the embodiment of the present invention, it should be understood that disclosed device and method, it can also
To realize by another way.Device and method embodiment described above is only schematical, for example, in attached drawing
Flow chart and block diagram show that the devices of multiple embodiments according to the present invention, method and computer program product are able to achieve
Architecture, function and operation.In this regard, each box in flowchart or block diagram can represent module, a program
A part of section or code, a part of the module, section or code include that one or more is patrolled for realizing defined
Collect the executable instruction of function.It should also be noted that in some implementations as replacement, function marked in the box
It can occur in a different order than that indicated in the drawings.For example, two continuous boxes can actually be held substantially in parallel
Row, they can also be executed in the opposite order sometimes, and this depends on the function involved.It is also noted that block diagram and/or
The combination of each box in flow chart and the box in block diagram and or flow chart, can the function as defined in executing or dynamic
The dedicated hardware based system made is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the present invention can integrate one independent portion of formation together
Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module
It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words
The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a
People's computer, electronic equipment 10 or the network equipment etc.) execute all or part of step of each embodiment the method for the present invention
Suddenly.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), deposits at random
The various media that can store program code such as access to memory (RAM, Random Access Memory), magnetic or disk.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability
Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device.
In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element
Process, method, article or equipment in there is also other identical elements.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of broadcast modulation method, which is characterized in that be applied to electronic equipment, which comprises
Original signal is received, wherein including left channel signals, right-channel signals and echo signal in the original signal；
The echo signal is isolated from the original signal using bandpass filter；
Parsing obtains the left channel signals and right-channel signals for including in the original signal, according to the left channel signals being resolved to
The first signal component and second signal component are calculated with right-channel signals；
First signal component and the second signal component are filtered using low-pass filter；
The first signal component and second signal component of the echo signal and completion filtering isolated are integrated to obtain
Integrated signal extracts the first setting signal and the second setting signal for including in the integrated signal, extract first is set
Determine signal and the second setting signal is exported.
2. broadcast modulation method according to claim 1, which is characterized in that the centre frequency of the bandpass filter is
57Khz, the passband width of the bandpass filter are 8Khz.
3. broadcast modulation method according to claim 1, which is characterized in that use bandpass filter from the original signal
In after the step of isolating the echo signal, the method also includes:
The echo signal is inputted into automatic gain controller；
The automatic gain controller is set to judge whether the amplitude of the echo signal is located in setting amplitude section, if the width
Value is not in the setting amplitude section, is adjusted the automatic gain controller to gain, until the target
The amplitude of signal is located in the setting amplitude section.
4. broadcast modulation method according to claim 1, which is characterized in that according to the left channel signals and right sound being resolved to
Road signal calculates the step of the first signal component and second signal component, comprising:
Obtain the amplitude of the left channel signals and the amplitude of the right-channel signals；
Using the half of the sum of the amplitude of the amplitude of the left channel signals and the right-channel signals as first signal point
The amplitude of amount；
Using the half of the amplitude of the left channel signals and the absolute value of the difference of the amplitude of the right-channel signals as described
The amplitude of binary signal component.
5. broadcast modulation method according to claim 4, which is characterized in that the method also includes:
Preemphasis processing is carried out to first signal component and the second signal component.
6. broadcast modulation method according to claim 4, which is characterized in that using low-pass filter to first signal
The step of component and the second signal component are filtered, comprising:
First time filtering is carried out to first signal component and the second signal component using the first low-pass filter, with filter
Except the echo signal being present in first signal component and the second signal component；
The first signal component and second signal component completing to filter for the first time are carried out second using the second low-pass filter
Filtering.
7. broadcast modulation method according to claim 1, which is characterized in that the integrated signal is integrated by following formula
It obtains:
W=M+S*sin38k*t+sin19*t+RDS*sin57*t
Wherein,
For integrated signal, M is the first signal component, and S is second signal component, and RDS is echo signal.
8. broadcast modulation method according to claim 1, which is characterized in that extract include in the integrated signal first
The step of setting signal and the second setting signal, comprising:
The first setting signal and the second setting signal for including in the integrated signal are extracted using Coordinate Rotation Digital algorithm.
9. broadcast modulation method according to claim 1, which is characterized in that by the first setting signal extracted and second
The step of setting signal is exported, comprising:
The first obtained setting signal will be extracted and the second setting signal is converted to analog signal and exports.
10. a kind of broadcast modulation device, which is characterized in that be applied to electronic equipment, described device includes:
Signal receiving module, for receiving original signal, wherein including left channel signals, right-channel signals in the original signal
And echo signal；
Bandpass filtering modules block, for isolating the echo signal from the original signal using bandpass filter；
Signal component computing module, for parsing the left channel signals and right-channel signals that obtain and include in the original signal,
The first signal component and second signal component are calculated according to the left channel signals and right-channel signals that are resolved to；
Low-pass filtering module, for being filtered using low-pass filter to first signal component and the second signal component
Wave；
FM module, for the echo signal isolated and complete filtering the first signal component and second signal component into
Row integral extracts the first setting signal and the second setting signal for including in the integrated signal, will mention to obtain integrated signal
The first setting signal and the second setting signal got are exported.
Priority Applications (1)
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