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[Concept] Restore the audio and video equipment, the same audio source (CD, DVD, etc.), preamplifier, amplifier (also known as power amplifier) ??and speakers (also known as horn) four basic parts. Car audio lead the most fundamental condition - playback sound. ================================= [Calendar history] 1923 United States first appeared in the assembly of car radios, many cars are then followed suit and installed radios in the instrument panel assembly. At this time waiting with tube radios are 1950s Semiconductor technology, the car radio technology revolution, gradually replaced by a semiconductor tube tube and improve the life of the car radio. The early 1970s Cassette tape recorders into the market, a car to play cassette tapes with the retractable dual-purpose machine in the car, at the same time the movement began to apply the integrated circuit. The late 1980s General car audio to a cassette retractable dual-use machine with a pair of speakers more than the basis of combination of the two-channel speaker around, and some placed on both sides of the instrument panel assembly, and some placed in the door, and some placed in the rear of the back seat, retractable dual-use machine output power of 20 watts. ================================= [Elements] Host, speaker, power amplifier parts. ---------------- A software and media] What do you want to listen? Traffic conditions of the program? You have to open the radio, and transferred to the correct channel. Want to watch TV in the car? It is more simple, the LCD screen has long been one of the protagonists of the car audio system, even if you want to see DVD is the same. Listen to music? Put a piece of your favorite album, whether it is CD, MD, cassette, just inside the collection is the song of any singer you like Liu Jialiang, I want to hear hip-hop, hear whoever put the Who album. steamed buns differ from each other. ---------------- 2 [audio] Able to decode the software and multimedia agency, that the sources. This terminology may seem difficult to understand, is actually a very simple thing! To broadcast radio tuner called, commonly known as the radio; called cassette player cassette playback seat; The play CD album, called CD-Player laser turntable - very simple! ---------------- 3 [pre-signal control Simply put, before the class after class before, we generally amplifier called class, so in between the sound source and amplifier, all music signal processing parts, are called before the class. Such as car audio console for the control of the volume size is the former part, which controls the signal strength of the degree. Other audio equipment, more commonly seen before the control section, as well as treble and bass adjustment, left and right balance, before and after volume adjustment, and Loudless loudness control. In addition, more complex audio equalizer (EQ), to see its features and bedside sound often adjust the tone multi-frequency, but also display different patterns of the screen the same functionality. In addition, the digital sound processor (DSP) is also host to many standard equipment, it simply is to simulate the sound characteristics of the space of the gymnasium, dance hall or concert hall. In short, any signal processing or adjustment of institutions, that is, before the class. ---------------- (4) power amplification mechanism Level control of the voice signal strength is mostly only a few volts, not enough to drive the monomer, it is necessary to signal to eat "Dali Wan, so that the stronger the signal strength to Watts (W), which will signal to strengthen the institutions of the success rate of output, is called the power amplifier, also known as amplifier. In general, the value of total output power of the sound system, that is, all the output power amplifier and is used as a sound system in the grading on the size of the series. ---------------- (5) [the speaker] Parts called the speaker of the electrical energy into sound waves. Perhaps there are readers to guess the speaker is commonly known as the horn! You ... can only be half right. Can signal into sound institutions, in addition to the general common other than circular or elliptical reciprocating moving-coil loudspeaker monomer, there are other types of speakers! Flat diaphragm electrostatic drive electrostatic speakers such as the ribbon-style metal band sound (the Ribbon), are sound in place. However, in the moving-coil loudspeaker in the car audio is still the mainstream impression in addition to USA Infinity Taiwan EVIL ribbon-style car tweeter, the other common moving coil monomer. ---------------- 6. Transmission organizations] A complete sound system, the wire is an integral 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 material, stranded structure, diameter, insulation and different impedance design and specifications will affect the signal or power transmission. The use of the wire due to the different equipment need to have the orientation of the wires of different design, such as power, ground, start signal, horn, fiber and special systems required for the wire, due to the respective requirements are different in design the difference. Speaker wire to sound quality, for example, the purity of their material must be as high as possible, otherwise too many impurities will affect the sound take full advantage of. In addition, the terminal between the cable and equipment is also very important, solid contact or not, the contact area the size of the joint design and material and grounding is good also on the sound effects have a significant impact. Currently commercially available host, and many already have the source, before class and after class, to include audio constitute the basic structure. Why? Do you see whether there is a single-disc CD, tape deck or radio host? At least one of the two! That is the sound source. Look at the car audio console, can not adjust the size of the volume, and even the most low-grade host treble and bass tone adjustment! That is, before the class. The host is not most of them have output power? If the car audio system, is host to go directly to push the speaker's words, it must be embedded in the host, power amplifiers, such as the common host of the original or modified host will have a power output. There is a host not attached to built-in power amplifier output, this host is commonly known as the dumb machine, only a signal output. Do not think that this host will be cheaper, in fact, most of the dumb machine belong to the most advanced flagship sound dumb machine must be installed amplifier, so the host materials of the internal parts are more advanced circuit architecture moves more complete, so the price is also the most expensive! Power amplifier, if accompanied by a tone adjustment, electronic crossover, equalization, or the parameters of the models, it contains the two parts of the former level after level, that is, multi-purpose amplifier; just pure power amplifier the machine, that is only level part. If the speaker? Needless to say, it is pure stage. Is included passive crossover, tailored just for the speaker components, although it also has a divider control signal and tone adjustments, but it still belongs to a part of the speaker system. Next time you see a car audio equipment, you can own analysis of it! System size are sound, some people may think that his car filled with the sound really is very simple, it can be called the sound? I would like to complete the conditions mentioned above, can issue you want to hear or to specify the sound can be called the sound, even if the equipment is only the original host with a few speakers. Conversely, if a several sources, the Ministry of amplifier large systems, but there is no volume control, can listen to you? If there is no speaker can sound? Such a system even if the scale is big, more equipment, are not regarded as sound. ================================= [Technical Note] ---------------- 1 [install size] The vast majority of cars on the stereo installed in the dashboard or the location of the sub-dashboard, while the narrow space within the dashboard, the volume of car audio console is bound to be limited on a common mounting holes standard size, called the DIN (German Industrial Standard) size. The standard DIN size 178 mm × 50 mm × 153 mm (length × width × depth). Some more advanced car audio console with multi-disc CD audio system, mounting hole size of 178 mm × 100 mm × 153 mm, also known as 2 times the DIN size, more common in the Japanese machine. Individual brands of car audio console is a non-standard size, can only specify to install certain types of car audio. Therefore, the purchase of car audio, must pay attention to the audio host size and the instrument panel mounting hole size whether adaptation. Car audio installation in addition to the instrument panel mounting hole size, more importantly, the entire sound system installation, especially the speakers and mechanical installation techniques. Because the pros and cons of the sound of a car, not only with the sound quality of relations, also has a direct relationship with the sound installation techniques. ---------------- 2 [shock] The vibration of the car, sound system installation technology to the pursuit of high stability and reliability. Car Audio has the following features: Car tape playback part of the multi-lateral placement, upper and lower clamping in order to ensure stable playback; Using high quality ceramic coated permalloy heads, the sound quality and durability are guaranteed; The CD part of the multi-level vibration, circuit board component soldering is absolutely reliable. --------------- 3 [sound processing Car audio sound processing have been made towards the development of digital technology. Advanced car audio with DAT digital audio DSP (digital signal processor), MP3 technology, the formation of the digital logic, high-power Hi-Fi stereo system. Car audio sound pros and cons In addition to the host configuration, as well as the quality of the speakers play a very important factor. Some people think that, in general car audio, speakers should be at least the total investment for more than half. Because the manufacture of high-quality speakers require complex technology, expensive but high, the bass often can not be achieved by ordinary speakers. Car audio speakers are generally more meticulous, especially in multiple sub-frequency loudspeaker is especially true. Car compartment space is limited, car audio speakers with big speakers, which use the dashboard, doors, according to local conditions after Circuit partitions and other parts and speakers to organically combine to form the fundamentals of the structure of a class of speakers, eliminating The sound waves are superimposed phenomena. Of course, the installation location of the speakers tend to affect the sound quality of car audio, the same pair of speakers will produce different results in different installation location, the installation location of the high-class cars stereo speakers to go through various testing to determine down. ---------------- (4) anti-jamming] Car stereo in a very complex environment, electromagnetic interference at any time by the ignition device and a variety of electrical appliances, all electrical appliances in the car with a battery, by the power lines and other lines sound generated interference. Car audio anti-interference technology to the power line interference filter choke string between the power and sound of space radiation interference metal case sealing and shielding, specializing in the audio to install the anti-jamming integrated circuits for reduce outside noise. ================================= [Line material] ---------------- A signal line The anti-interference, can reduce the signal attenuation, good contact, the joints to prevent oxidation. Some of the top signal line often using special alloys and snap ring type plug to plug gold plated to prevent oxidation. ---------------- (2) [power cord] Requirements of current and voltage stability, impedance, current attenuation. Choice of power supply wire and power, power is often the current need to choose a thicker wire. The material is generally pure metals of high purity line, senior enthusiasts might use sterling silver wire. Wrapped the power cord insulation material in addition to insulation, but also high temperatures. ================================= 【Article is excerpted from: Baidu Encyclopedia】 |
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