功率放大器英文文献翻译及参考文献 第2页
The power amplifier is only originally by the discrete component form composition electric circuit, in recent years, along with the science and technology popularization and the cultural level enhancement, the power amplifier also had the integrated product, and in the stadium, the shade theater, the song ballroom, the family Hi-Fi music appreciation, AV situations and so on system playback, Kara OK obtained the widespread application.
The power amplifier is enlarges the audio frequency voltage signal to certain power and actuates the speaker sound production one kind of equipment.The power amplifier is playing the extremely vital role in the sound amplification, if does not have the power amplifier speaker not to be able to amplify sound.
The power amplifier is the acoustics core part, regardless of is the tuner output signal, the microphone, the tape recorder, the record player output the signal, will all have to enlarge later after the power amplifier to be able to impel the sound box to make the sound.
The power enlarges is the voltage amplification, the characteristic is may lead the big load, in other words, may output the big electric current.May divide into the low frequency power amplifier and the high frequency power amplifier according to the bandwidth.The low frequency power amplifier like impetus audio frequency merit puts; The high frequency power amplifier like television station radar launches radio microwave.
The power amplifier type is many, but nothing else but establishes separately the electric circuit, the integrated circuit, along with the毕业论文
http://www.751com.cn/low, installs the debugging simply and so on the merits.Now, the integration power amplifier has substituted for the power amplifier which is composed by the discrete component.If the audio power amplifier, the radio frequency power amplifier, magnetism merit put and so on. This article power amplifier will use the integration power amplifier.
At present along with the high fidelity three-dimensional audio technology popularization, many power amplifiers also has applied the high fidelity technology.The high fidelity meaning is refers to the audio frequency electro-acoustic system and the equipment or the part maintains the sound signal original appearance ability.Regarding the general family acoustics so long as the bass is vigorous, is plentiful, the tenor is solid, is powerful, treble clear bright, can make the listener to be satisfied also thought achieved the high fidelity the request.
Person at talk of time the strength of the voice be very limited, if make in a the assembly hall which have a thousands person the each person's ability clearly hear is impossible.Make use of power enlarger, person as long as toward a words tube to talk, through power enlarger enlarge, send out from the loudspeaker again very strong of voice, can make the person of whole assembly hall all hear.The voice that the person talk became weak through a words tube of telecommunication number, the electric voltage size of this signal together voice of strong or weak become direct proportion, it of frequency together voice of frequency homology, this kind of telecommunication number be called audio frequency signal.There is the audio frequency signal that the words tube get, the electric voltage only have several milli- Fu, power enlarger this weak of the audio frequency signal enlarge, from the power enlarger output carry can output the power reach several tile to several ten tiles, with go to larger audio frequency signal, push loudspeaker, send out strong of voice.
In this process, the function of power enlarger is to carry on audio frequency telecommunication number to enlarge, so the power enlarger be also an audio frequency enlarger.The words tube can become the telecommunication number to the voice;The loudspeaker can become the voice to the telecommunication number.We are called the electricity voice to this component component.Power enlarger have to together electricity voice component match usage, then can exertive of function.The power enlarge electric circuit(brief name power enlarger) usually Be located on many the class enlarge the last class of electric circuit, its mission is front the class electric circuit enlarge behind of electric voltage signal again carry on power to enlarge, with enough of output power push performance organization work, such as loudspeaker give out sound, the electric motor revolve, after electric appliances action, appearance the needle deflect etcThe power enlarge electric circuit and electric voltage to enlarge electric circuit to all belong to energy conversion electric circuit, they are to provide the direct current power the direct current power supply the conversion become is enlarged signal of exchanges power, have thus the function that power and electric voltage enlarge.But because of in manily the class enlarge the electric circuit the position of the place dissimilarity, they respectively of function is dissimilarity of:The electric voltage which place class before be placed in enlarge the mission of electric circuit is identify the weak signal of importation and take into valid of enlarge, mostly work under the condition of low electric voltage, small electric current, low Zao voice, research of the main index sign be an electric voltage to enlarge multiple, importation electric resistance, output electric resistance, letter Zao ratio, frequency characteristic etc., they work, oneself consume of power not big, get down one class output's main is an electric voltage signal。
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