CN109327223B - Method and system for converting digital signal into analog signal - Google Patents
Method and system for converting digital signal into analog signal Download PDFInfo
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- CN109327223B CN109327223B CN201811161177.4A CN201811161177A CN109327223B CN 109327223 B CN109327223 B CN 109327223B CN 201811161177 A CN201811161177 A CN 201811161177A CN 109327223 B CN109327223 B CN 109327223B
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Abstract
The invention discloses a method for converting a digital signal into an analog signal, which comprises the following steps: acquiring an excitation signal to obtain a reference signal; acquiring a digital signal to be converted, and resolving an angle of the digital signal to be converted; calculating a digital-to-analog conversion code of the analog signal based on the digital signal to be converted and the transformation ratio of the target analog signal by using the angle of the digital signal to be converted; outputting an analog signal for amplitude modulation by using a digital-to-analog conversion code; multiplying the reference signal by the analog signal for amplitude modulation to obtain an analog signal after amplitude modulation; and amplifying the amplitude-modulated analog signal to obtain a target analog signal. Compared with a special high-cost highly-integrated digital signal to analog signal conversion module adopted in the prior art, the conversion method has the advantages of simple steps and low requirement on hardware, and can reduce the cost of digital-to-analog signal conversion. In addition, the application also discloses a digital signal to analog signal conversion device, and the device has simple structure and low manufacturing cost, and can obviously reduce the cost of digital-to-analog signal conversion.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to a method and a system for converting a digital signal into an analog signal.
Background
With the development of electronic technology, digital signals become the first choice for signal output due to the advantages of strong anti-interference, no noise accumulation, convenience for encryption, storage, processing and exchange and the like. However, in practical use, the input signals required by some accessory devices are analog signals, and the devices are expensive and have high replacement cost, so that devices for converting digital signals into analog signals are also required. Such as heading signals, pitch and roll attitude signals for a marine platform compass, compass minutes, heading data recorders, etc.
The existing equipment on the market uses a highly integrated module for converting digital signals into analog signals, and the cost is high.
Therefore, how to provide a new technical scheme to convert a digital signal into an analog signal at low cost becomes a problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problems to be solved by the invention are as follows: how to provide a new technical scheme to realize the conversion of digital signals into analog signals with low cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for converting a digital signal into an analog signal comprises the following steps:
obtaining an excitation signal, taking the excitation signal as a reference signal sin omega t of a target analog signal when the voltage of the excitation signal is the same as that of the target analog signal, adjusting the voltage of the excitation signal to be the same as that of the target analog signal when the voltage of the excitation signal is different from that of the target analog signal, and taking the excitation signal as the reference signal sin omega t of the target analog signal, wherein the target analog signal can be expressed as k0Sin ω t sin θ and k0Sin ω t cos θ, where k0Is the amplification factor of the target analog signal, sin theta and cos theta are the digital-to-analog conversion code of the target analog signal;
acquiring a digital signal to be converted, and resolving an angle of the digital signal to be converted;
calculating digital-to-analog conversion codes sin theta and cos theta of the analog signal based on the conversion ratio of the digital signal to be converted and the target analog signal by utilizing the angle of the digital signal to be converted;
outputting an analog signal for amplitude modulation by using digital-to-analog conversion codes sin theta and cos theta;
multiplying the reference signal sin ω t by the analog signal for amplitude modulation to obtain analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation;
based on the amplification factor k0Amplifying the amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ to obtain a target analog signal k0Sin ω t sin θ and k0·sinωt·cosθ。
A digital signal to analog signal system comprises a processor, a digital-to-analog conversion device, a hardware multiplier and a first operational amplifier, wherein:
the input end of the processor is connected with the output end of a digital signal to be converted, the output end of the processor is connected with the input end of the digital-to-analog conversion device, the processor is used for acquiring the digital signal to be converted, calculating the angle of the digital signal to be converted, calculating the sum of digital-to-analog conversion codes sin theta of the analog signal based on the transformation ratio of the digital signal to be converted and a target analog signal by using the angle of the digital signal to be converted, and sending the sum of the digital-to-analog conversion codes sin theta and cos theta to the digital-to-analog conversion device;
the output end of the digital-analog conversion device is connected with the first input end of the hardware multiplier, and the digital-analog conversion device is used for outputting analog signals for amplitude modulation by using digital-analog conversion codes sin theta and cos theta and sending the analog signals for amplitude modulation to the hardware multiplier;
the second input end of the hardware multiplier is connected with the output end of the reference signal, the output end of the hardware multiplier is connected with the input end of the first operational amplifier, and the hardware multiplier is used for multiplying the reference signal sin ω t by the analog signal for amplitude modulation to obtain analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation, and sending the analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation to the first operational amplifier;
the first operational amplifier is used for amplifying the signal based on the amplification factor k0Amplifying the amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ to obtain a target analog signal k0Sin ω t sin θ and k0·sinωt·cosθ。
Preferably, the device further comprises a pressure regulating device, wherein:
the input end of the voltage regulating device is connected with the output end of the excitation signal, the output end of the voltage regulating device is connected with the second input end of the hardware multiplier, and the voltage regulating device is used for regulating the voltage of the excitation signal to be the same as that of the target analog signal and then used as a reference signal sin omega t of the target analog signal when the voltage of the excitation signal is different from that of the target analog signal.
Preferably, the digital-to-analog conversion device comprises a digital-to-analog converter and a second operational amplifier, wherein:
the input end of the digital-analog converter is used as the input end of the digital-analog conversion device and connected with the output end of the processor, the output end of the digital-analog converter is connected with the input end of the second operational amplifier, the digital-analog converter is used for outputting analog signals for amplitude modulation to be processed by using digital-analog conversion codes sin theta and cos theta and sending the analog signals for amplitude modulation to be processed to the second operational amplifier, and the analog signals for amplitude modulation to be processed only have positive amplitude values or negative amplitude values;
the output end of the second operational amplifier is used as the output end of the digital-analog conversion device and is connected with the first input end of the hardware multiplier, and the second operational amplifier is used for processing the analog signal for amplitude modulation to be processed, which only has positive amplitude or only has negative amplitude, into the analog signal for amplitude modulation with positive amplitude and negative amplitude.
In summary, the present invention discloses a method for converting digital signals into analog signals, which comprises the following steps: acquiring an excitation signal, taking the excitation signal as a reference signal sin ω t of the target analog signal when the voltage of the excitation signal is the same as that of the target analog signal, adjusting the voltage of the excitation signal to be the same as that of the target analog signal when the voltage of the excitation signal is different from that of the target analog signal, and taking the adjusted voltage of the excitation signal as the reference signal sin ω t of the target analog signal, wherein the target analog signal can be represented as k0Sin ω t sin θ and k0Sin ω t cos θ, where k0Is the amplification factor of the target analog signal, sin θ and cos θ are the digital-to-analog conversion codes of the target analog signal; acquiring a digital signal to be converted, and resolving an angle of the digital signal to be converted; calculating digital-to-analog conversion codes sin theta and cos theta of the analog signal based on the conversion ratio of the digital signal to be converted and the target analog signal by utilizing the angle of the digital signal to be converted; outputting an analog signal for amplitude modulation by using digital-to-analog conversion codes sin theta and cos theta; the reference signal sin ω t and the analog signal for amplitude modulationMultiplying to obtain amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ; based on the amplification factor k0Amplifying the amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ to obtain a target analog signal k0Sin ω t sin θ and k0Sin ω t cos θ. Compared with a special high-cost highly-integrated digital signal to analog signal conversion module adopted in the prior art, the conversion method has the advantages of simple steps and low requirement on hardware, and can reduce the cost of digital-to-analog signal conversion. In addition, the application also discloses a digital signal to analog signal conversion system, and the device has the advantages of simple structure and low manufacturing cost, and can obviously reduce the cost of digital-to-analog signal conversion.
Drawings
For purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made in detail to the present invention as illustrated in the accompanying drawings, in which:
FIG. 1 is a flow chart of a method for converting digital signals into analog signals according to the present invention;
fig. 2 is a schematic structural diagram of a digital signal to analog signal conversion system disclosed in the present invention.
Description of reference numerals: the device comprises a processor 1, a digital-analog conversion device 2, a hardware multiplier 3, a first operational amplifier 4, a voltage regulating device 5, a digital-analog converter 6 and a second operational amplifier 7.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention discloses a method for converting digital signals into analog signals, comprising the following steps:
s101, obtaining an excitation signal, taking the excitation signal as a reference signal sin omega t of a target analog signal when the voltage of the excitation signal is the same as that of the target analog signal, adjusting the voltage of the excitation signal to be the same as that of the target analog signal when the voltage of the excitation signal is different from that of the target analog signal, and taking the excitation signal as the reference signal sin omega t of the target analog signal, wherein the target analog signal can be expressed as k0Sin ω t sin θ and k0Sin ω t cos θ, where k0Is the amplification factor, sin, of the target analog signalTheta and cos theta are digital-to-analog conversion codes of the target analog signal;
s102, acquiring a digital signal to be converted, and resolving an angle of the digital signal to be converted;
s103, calculating digital-to-analog conversion codes sin theta and cos theta of the analog signals based on the conversion ratio of the digital signals to be converted and the target analog signals by utilizing the angle of the digital signals to be converted;
for example, the input digital signal is 45 °, the conversion ratio of the digital signal to the analog signal is 1:10, i.e., 36 ° of the digital signal corresponds to 360 ° of the analog signal, then θ is (45 ° -36 °) × 10, and then the digital-to-analog conversion codes sin θ and cos θ are calculated.
S104, outputting an analog signal for amplitude modulation by using digital-to-analog conversion codes sin theta and cos theta;
s105, multiplying the reference signal sin ω t by the analog signal for amplitude modulation to obtain analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation;
s106, based on the amplification factor k0Amplifying the amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ to obtain a target analog signal k0Sin ω t sin θ and k0·sinωt·cosθ。
Compared with a special high-cost highly-integrated digital signal to analog signal conversion module adopted in the prior art, the conversion method has the advantages of simple steps, low requirement on hardware and capability of reducing the cost of digital-to-analog signal conversion.
As shown in fig. 2, the present invention also discloses a digital signal to analog signal conversion system, which comprises a processor, a digital-to-analog conversion device, a hardware multiplier, and a first operational amplifier, wherein:
the input end of the processor is connected with the output end of a digital signal to be converted, the output end of the processor is connected with the input end of the digital-to-analog conversion device, the processor is used for acquiring the digital signal to be converted, resolving the angle of the digital signal to be converted, calculating digital-to-analog conversion codes sin theta and cos theta of an analog signal based on the transformation ratio of the digital signal to be converted and a target analog signal by using the angle of the digital signal to be converted, and sending the digital-to-analog conversion codes sin theta and cos theta to the digital-to-analog conversion device;
the output end of the digital-analog conversion device is connected with the first input end of the hardware multiplier, and the digital-analog conversion device is used for outputting analog signals for amplitude modulation by using digital-analog conversion codes sin theta and cos theta and sending the analog signals for amplitude modulation to the hardware multiplier;
the second input end of the hardware multiplier is connected with the output end of the reference signal, the output end of the hardware multiplier is connected with the input end of the first operational amplifier, the hardware multiplier is used for multiplying the reference signal sin ω t by the analog signal for amplitude modulation to obtain analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation, and sending the analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation to the first operational amplifier;
the first operational amplifier is used for amplifying the signal based on the amplification factor k0Amplifying the amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ to obtain a target analog signal k0Sin ω t sin θ and k0·sinωt·cosθ。
In the invention, the processor can adopt a C8051 singlechip, and the digital signal to analog signal conversion system can realize the conversion of digital signals to analog signals by adopting the method for converting digital signals to analog signals.
When the concrete implementation, still include the regulator, wherein:
the input end of the voltage regulating device is connected with the output end of the excitation signal, the output end of the voltage regulating device is connected with the second input end of the hardware multiplier, and the voltage regulating device is used for regulating the voltage of the excitation signal to be the same as that of the target analog signal and then serving as a reference signal sin omega t of the target analog signal when the voltage of the excitation signal is different from that of the target analog signal.
The voltage values of the obtained excitation signal and the signal required by the target load may be different, and at this time, the excitation signal needs to be regulated to obtain a reference signal with the same voltage value as the voltage value required by the load.
In specific implementation, the digital-to-analog conversion device includes a digital-to-analog converter and a second operational amplifier, wherein:
the input end of the digital-analog converter is used as the input end of the digital-analog conversion device and is connected with the output end of the processor, the output end of the digital-analog converter is connected with the input end of the second operational amplifier, the digital-analog converter is used for outputting analog signals for amplitude modulation to be processed by utilizing digital-analog conversion codes sin theta and cos theta and sending the analog signals for amplitude modulation to be processed to the second operational amplifier, and the analog signals for amplitude modulation to be processed only have positive amplitude values or negative amplitude values;
the output end of the second operational amplifier is used as the output end of the digital-analog conversion device and is connected with the first input end of the hardware multiplier, and the second operational amplifier is used for processing the analog signal for amplitude modulation to be processed, which only has positive amplitude or only has negative amplitude, into the analog signal for amplitude modulation with positive amplitude and negative amplitude.
In order to further reduce the hardware cost, a digital-to-analog converter which can only output positive amplitude or negative amplitude can be adopted, and at this time, in order to ensure the integrity of the finally obtained target analog signal, a second operational amplifier is required to process the analog signal for amplitude modulation to be processed, which only has positive amplitude or only has negative amplitude, into the analog signal for amplitude modulation with positive amplitude and negative amplitude.
In the present invention, the amplification factor k0Is set according to the requirements of the load equipment, and in the invention, the amplification factor k0And may be greater than 1 or less than 1, and therefore, the amplification in this application is merely a description of the corresponding step, and is not necessarily increased, and may be decreased.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that, while the invention has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for converting a digital signal to an analog signal, comprising the steps of:
acquiring an excitation signal, taking the excitation signal as a reference signal sin ω t of the target analog signal when the voltage of the excitation signal is the same as that of the target analog signal, adjusting the voltage of the excitation signal to be the same as that of the target analog signal when the voltage of the excitation signal is different from that of the target analog signal, and taking the adjusted voltage of the excitation signal as the reference signal sin ω t of the target analog signal, wherein the target analog signal can be represented as k0Sin ω t sin θ and k0Sin ω t cos θ, where k0Is the amplification factor of the target analog signal, sin θ and cos θ are the digital-to-analog conversion codes of the target analog signal;
acquiring a digital signal to be converted, and resolving an angle of the digital signal to be converted;
calculating digital-to-analog conversion codes sin theta and cos theta of the analog signal based on the conversion ratio of the digital signal to be converted and the target analog signal by utilizing the angle of the digital signal to be converted;
outputting an analog signal for amplitude modulation by using digital-to-analog conversion codes sin theta and cos theta;
multiplying the reference signal sin ω t by the analog signal for amplitude modulation to obtain analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation;
based on the amplification factor k0Amplifying the amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ to obtain a target analog signal k0Sin ω t sin θ and k0·sinωt·cosθ。
2. A digital-to-analog signal system for implementing the method of claim 1, comprising a processor, a digital-to-analog conversion device, a hardware multiplier, and a first operational amplifier, wherein:
the input end of the processor is connected with the output end of a digital signal to be converted, the output end of the processor is connected with the input end of the digital-to-analog conversion device, the processor is used for acquiring the digital signal to be converted, calculating the angle of the digital signal to be converted, calculating digital-to-analog conversion codes sin theta and cos theta of an analog signal based on the transformation ratio of the digital signal to be converted and a target analog signal by using the angle of the digital signal to be converted, and sending the digital-to-analog conversion codes sin theta and cos theta to the digital-to-analog conversion device;
the output end of the digital-analog conversion device is connected with the first input end of the hardware multiplier, and the digital-analog conversion device is used for outputting analog signals for amplitude modulation by using digital-analog conversion codes sin theta and cos theta and sending the analog signals for amplitude modulation to the hardware multiplier;
the second input end of the hardware multiplier is connected with the output end of the reference signal, the output end of the hardware multiplier is connected with the input end of the first operational amplifier, and the hardware multiplier is used for multiplying the reference signal sin ω t by the analog signal for amplitude modulation to obtain analog signals sin ω t · sin θ and sin ω t · cos θ after amplitude modulation, and sending the analog signals sin ω t · cos θ after amplitude modulation to the first operational amplifier;
the first operational amplifier is used for amplifying the signal based on the amplification factor k0Amplifying the amplitude-modulated analog signals sin ω t · sin θ and sin ω t · cos θ to obtain a target analog signal k0Sin ω t sin θ and k0·sinωt·cosθ。
3. The digital-to-analog signal system of claim 2, further comprising a voltage regulator, wherein:
the input end of the voltage regulating device is connected with the output end of the excitation signal, the output end of the voltage regulating device is connected with the second input end of the hardware multiplier, and the voltage regulating device is used for regulating the voltage of the excitation signal to be the same as that of the target analog signal and then used as a reference signal sin omega t of the target analog signal when the voltage of the excitation signal is different from that of the target analog signal.
4. The digital-to-analog signal system of claim 2, wherein the digital-to-analog conversion means comprises a digital-to-analog converter and a second operational amplifier, wherein:
the input end of the digital-analog converter is used as the input end of the digital-analog conversion device and connected with the output end of the processor, the output end of the digital-analog converter is connected with the input end of the second operational amplifier, the digital-analog converter is used for outputting analog signals for amplitude modulation to be processed by using digital-analog conversion codes sin theta and cos theta and sending the analog signals for amplitude modulation to be processed to the second operational amplifier, and the analog signals for amplitude modulation to be processed only have positive amplitude values or negative amplitude values;
the output end of the second operational amplifier is used as the output end of the digital-analog conversion device and is connected with the first input end of the hardware multiplier, and the second operational amplifier is used for processing the analog signal for amplitude modulation to be processed, which only has positive amplitude or only has negative amplitude, into the analog signal for amplitude modulation with positive amplitude and negative amplitude.
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| JPWO2015029427A1 (en) * | 2013-08-30 | 2017-03-02 | パナソニックＩｐマネジメント株式会社 | Angular position detector |
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| US6285307B1 (en) * | 1997-02-26 | 2001-09-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Method of and a device for analog signal sampling |
| KR20050000774A (en) * | 2003-06-24 | 2005-01-06 | 삼성전기주식회사 | Signal processor for electronic compass |
| CN107466445A (en) * | 2016-08-12 | 2017-12-12 | 上海联影医疗科技有限公司 | gradient power amplifier debugging method and system |
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