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【Concept】
Restore the sound and video equipment , also has a source (CD, DVD , etc. ) , preamplifiers, loudspeakers ( also known as power amplifiers ) , speakers ( also known speaker ) four basic parts.
Car Audio cited basic condition is that - there are sound playback functions .
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【Integral Terminology】
Host / speaker / amplifier
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1 [ Software & Media ]
You want to hear something ? Traffic conditions of the program ? Then you have to open the radio station , and to the correct channel. Want to watch TV in the car ? The more simple, the LCD screen has long been one of the protagonists car audio systems , even if you want to see the DVD is the same.
Listen to music? Put a your favorite album of it , whether it is CD, MD, cassette, which included just the singer's voice is calling you like Liu Jialiang , I want to hear hip-hop, who want to hear the album whoever put it, steamed buns differ from each other .
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2 [ Audio ]
Can decode software and multimedia agency , that the sources. This terminology may seem difficult to understand , in fact, very simple stuff !
Play radio tuner called , commonly known as radio ; playing cassette called cassette playback seat ;
As for playing CD album , called CD-Player, but also for laser discs - very simple!
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3 [ pre- signal control ]
In simple terms, that is, before the former level after level , we will generally be referred to later -stage amplifier , so in between the sound source and amplifier, all the music signal processing parts are called before the class.
For example, a car stereo master volume control , that is part of belonging to the former level , which controls the strength of the signal is . Other audio equipment , the more often seen preamp control section , as well as treble and bass adjustments, about balance , front and rear volume adjustment , and Loudless loudness control . In addition there are more complex audio equalizer (EQ), its function and bedside sound often seen , with the tone multi- frequency adjustment , the same function is also displayed different patterns screen.
In addition, the digital sound processor (DSP) is also now standard on many hosts , it simply is simulated stadium , concert hall or ballroom space such as sound characteristics .
In short , where there are about treatment or adjust the signals institution is the former level .
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4 [ power amplification mechanism ]
Before the sound level control signal strength mostly only a few volts, is not enough drive units , so the signal must eat " Dali Wan ," so that the signal strength is stronger, so that it can Watts (W) to calculate, so that the the success rate of the output signal to strengthen institutions , it is called a power amplifier , which is commonly known as the amplifier .
Generally, the value of total output power audio system , which is the system of all the output power of the amplifier and have been used as a sound system hierarchical progression in size .
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5 [ Speakers ]
The mechanical energy of sound waves become known as the speaker. Readers may have guessed speaker is commonly known speaker !
Right ...... only half right . Can signal into sound institutions , in addition to the generally circular or oval common reciprocating moving coil speaker monomer , there are other types of speakers ! For example, with the sound of metal ribbon type (Ribbon), driven planar electrostatic diaphragm electrostatic speakers, but also have a place in the stereo. But still the mainstream in the moving coil speaker car audio in addition to the U.S. Infinity impression EVIL with ribbons and Taiwan -style car outside the tweeter , the other for the common moving coil monomer.
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6 [ transmission mechanism ]
A complete sound system , the wire is essential combination of components , but the wire is often easily overlooked .
In fact, the wire is good or bad , will directly affect the quality of the sound, because the wire transfer from the material , stranded structure, to different signals or electricity will affect the design and specifications on the diameter of the insulation and resistance values, etc. .
The use of the wire , due to the different needs of different equipment design oriented wire, such as power, ground , start signals , horn , fiber optic cables and special systems required , because of their different requirements and the design has the distinction .
Such requirements in terms of sound quality speaker wire , the purity of the material must be as high as possible , otherwise it will affect too many impurities full advantage of the sound.
Furthermore terminal equipment between the wire and the also very important contacts firmly or not , the size of the contact area , the joint design and materials as well as the ground is good, also have a significant impact on the sound effects.
Among the host of commercially available currently , many already have a source , before and after stage , the basic structure include a sound composition.
Why do I say ?
You see whether the host has a single-disc CD, tape deck or radio ? Different from at least one of it ! That is the source it .
Look at car audio host , is not possible to adjust the size of the volume , but even the most low-end hosts also have to adjust the treble and bass tone right ! That is, there is a front stage .
Most hosts have output power is not it? If the car audio systems, speakers are pushed directly to the host , then it must be embedded in a host of power amplifiers, such as the original host or the most common modification hosts will have a power output. The host does not have a built-in power amplifier output is attached , which is generally known as the dumb host machine , only the signal output only. Do not think that this host will be cheaper , in fact, most of the dumb machines are among the most advanced flagship , because it will use the dumb machine must be installed audio amplifier , so the internal parts of the host material is more advanced , more walk the line structure is complete , so the price is the most expensive !
In terms of the power amplifier , if accompanied by tone adjustment , electronic crossover , etc. , or other parameters of functional models, it contains both pre- and post -class section , which is integrated Amplifier ; if just purely for power amplification the model is that only a portion of the stage .
If the speaker does ? Needless to say, it is pure stage . Even includes a passive crossover, tailored just for the horn parts , although it is also a control signal divider and adjust the tone , but it still belongs to a part of the speaker system.
Next time you see a car audio equipment any time , you can analyze it yourself ! System sizes are sound , some people will think that his car stereo equipment , but it is simple , so it can be called a sound ? I think if you complete the above conditions can be issued or specify that you want to hear the sound , it can be called sound, even if the original host equipment with just a few speakers.
Conversely, if there are several sources of a lot of the Ministry of oversized system amplifier has no volume control, to listen? If there is no speaker , could ringing? Such a system even if the scale is bigger, more equipment , are not regarded as a sound .
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【Technical terms】
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1 [ installation size ]
The vast majority of car audio installation location on the dashboard or on the dashboard , vice , and the space within these narrow dashboard , car stereo master volume is bound to be limited, and therefore the international community gave rise to a universal mounting holes standard size, called DIN ( German industrial Standard ) size.
Standard DIN size of 178 mm × 50 mm × 153 mm ( length × width × depth ) .
Some of the more advanced car audio console with multi- disc CD stereo and other devices, mounting hole size of 178 mm × 100 mm × 153 mm, also known as 2 -fold DIN size , common Japanese machines .
And their individual brands of cars belonging to non-standard size audio console , you can only specify a certain type of car stereo installation .
So the purchase of car audio , stereo host must pay attention to the size of the instrument panel mounting hole size is fit .
In addition to car audio installation dashboard mounting hole size , more importantly, is to install the entire sound system , especially the horn and mechanical installation techniques . Because the pros and cons of a car stereo , a relationship not only with the quality of sound itself , but also has a direct relationship with the sound installation techniques .
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2 [ shock ]
Vibration of the car is relatively large, installed sound system technology to pursue high stability and high reliability.
So car stereo has the following characteristics:
Car tape playback part way to use more lateral placement , in order to ensure the stability of the upper and lower clamping playback ;
Using high-quality ceramic coating permalloy head , so the sound quality and durability are guaranteed ;
CD part of a multi- stage damping method requires soldering components on the circuit board is absolutely reliable.
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3 [ sound processing ]
Car audio sound processing has been towards the development of digital technology .
Advanced car audio with DAT digital audio , DSP ( digital signal processor ), MP3 technology, formed a digital, logical , powerful Hi-Fi stereo system.
Car stereo sound in addition to the merits of the host configuration , and the quality of the speakers play a very important factor.
Some people think that , in general, car stereo , speakers should be at least more than half of the total investment .
Because the manufacture of high-quality speakers require sophisticated technology , expensive but high , which produces bass speakers are often unable to meet the ordinary . So, the car stereo speakers are generally more meticulous , especially multi- way frequency horn even more so.
Sedan car space is limited, car stereo speakers is impossible with a large speaker , which requires the use of local conditions dashboard, doors, partitions and other components with the enclosed speakers organically combine to form a structural principle of this class speakers , eliminating sound waves are superimposed phenomenon .
Of course , the installation location often affects the speaker car audio sound quality , the same pair of speakers installed in a different location will produce different results, so the installation location class cars stereo speakers to be determined after various tests down .
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4 [ interference ]
Car audio is in a very complex environment, it stands by the car engine ignition devices and electromagnetic interference various electrical appliances , especially all appliances are using a car battery , but through the power lines and other lines of acoustic interference.
Anti- interference technology car audio interference on each power line between the power supply using the choke strings and sound filtering interference for space radiation shielding metal case sealed , interference in the audio IC specifically installed to reduce noise outside .
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【Term wire】
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1 [ signal line ]
Requires good anti-jamming , can reduce the signal attenuation , good contact, the joints to prevent oxidation.
Some of the top signal line often using special alloy materials, card ring plugs and plug gold plated to prevent oxidation .
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2 [ Power Line ]
Requires current and voltage stability , resistance is small, the current decay is small.
Selection and power supply on the wire , power is often a large current is necessary to select coarse wire.
Materials commonly used high purity pure metal wire , experienced enthusiasts may use sterling silver wire .
Wrap the power cord insulation material in addition to insulation, but also can withstand high temperatures .
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【Article is excerpted from: Web Search】
【Reserved Integrate / Just Reference】
【Translation is by The Network】
