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11-08-2011, 04:10 AM
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#2
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General
Join Date: Feb 2011
Posts: 1,448
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Analog divider divider
is a circuit inside the speaker device to the input analog audio signal into separate treble, alto, skechers shape ups, bass and other different parts, and then were sent to the appropriate high, medium, bass speaker playback unit. Did so because of any single speaker can not perfect all the sound playback from a full band.
directory
action principle defined classification of power electronic divider divider divider divider connected in the definition of merit is the sound signals of different frequencies to distinguish, respectively, to the amplification, and then sent to the appropriate speakers in the band and then replay. In the high-quality sound reproduction, the need for electronic frequency processing.
divider
Crossover: Crossover is the speaker in the role of the Amplifier's output signal must go through the filter components in the crossover treatment, so that each unit by a specific frequency signals. Should be scientific, reasonable and precise to design a good speaker of the crossover, speaker unit can be effectively modified the different characteristics, optimize the mix, making each unit exceed and thoroughly deserved to play out their potential to change the frequency response of the band have smooth, accurate audio-visual phase in order to make high, middle, bass player out of the music structured, step, clear, comfortable, wide, natural sound quality. Principle from the circuit structure, the divider is essentially constituted by the capacitors and inductors in the LC filter network, the treble channel is high-pass filter, which only high-frequency signals through the resistance to this low frequency signal; bass channel just like anti- , only to stop the bass through the high-frequency signal; tenor channel is a bandpass filter, in addition to one low and one high frequency between the two can crossover, high frequency components and low frequency components
divider principle
will be blocked. In the actual divider, sometimes in order to balance high sensitivity differences between the woofer, but also join decay resistance; In addition, some also joined by the divider resistors, capacitors, impedance compensation network formed with the aim of the speaker's impedance curve of a number of psychological flat, so that power amplifier driver. Now that almost all the speakers frequency bands using multi-element design reproducing means there must be a device that can be sent to the full-band power amplifier required music signal is divided into treble and bass output, or treble, alto, bass output, can be connected with the corresponding speaker, crossover, skechers tone ups, is one such device. If the full-band signal is not added directly into the distribution of high, middle, bass unit to go outside in the elements of that part of the frequency response treble, tenor cell damage. After the classification power divider in the power amplifier, set in the speaker, through the LC filter network, the power amplifier output power the audio signal into bass, midrange and treble, was sent to each speaker. Connection is simple, easy to use, but power consumption, there audio valley point, resulting in crossover distortion, and its parameters, some directly related to the speaker impedance, while the speaker impedance is a function of frequency, the larger deviation from the nominal value, so the error also larger, is not conducive to adjustment. Electronic crossover to the weak signal frequency audio equipment, power amplifiers in the front, and then divided with separate power amplifiers, to give each of the audio frequency signal amplification, and then were sent to the corresponding speaker unit. Therefore, because of current low less power available to achieve electronic active filter, adjust more easily to reduce the power loss, and interference between speaker units. Makes the signal loss is small, good sound quality. However, this approach to use separate power amplifiers for each channel, high cost and complex circuit structure, used in professional sound reinforcement systems. Divider, The first is the divider of the crossover point, shape ups skechers, this should be needless to say. The second is the so-called crossover Road. The third is the divider of the A passive divider, in essence, a few high-pass and low pass filter circuit of the complex, the number of filter circuit which is mentioned above, the But in each filter circuit, there are more refined, in other words, in each filter circuits, can be repeated each filter, the frequency of the filter is the divider of the Capacity of the first order frequency divider is also a sense of structure, while the second divider in the road have been twice each filter, the In fact, the Dual crossovers, both high and low frequency second-order filter In addition to the first order and second sub-frequency band, there are third-order passive crossover, fourth or even sixth-order frequency. The benefits of using high frequency filter attenuation slope in its larger, better frequency, but also to the design frequency compensation circuit (since it is not In theory, the frequency curve after the superposition of two signals, after fully consistent with the original curve, this is a really good crossover), but the high frequency of large power loss, especially in the phase of large, poorly designed sound will be mixed. So instead of the more high-end frequency, the better. 2.0 multimedia speakers on the market, the use of capacitors or RC frequency in the majority, with very little crossover, skechers shape up shoes, but with fewer second-order frequency. SB-2000, such as shock wave using a first-order crossover, frequency of use of second order, only the Swans T200A, M200, Edifier S2000, 1900TIII so few only. (Note: there are many high-end speakers uses a second frequency.) Passive crossover network passive crossover network (Crossover Network), the domestic habits called a very complex task. Passive crossover different physical frequency response, and to meet the requirements of the Will feature passive voice is responsible for full-band output amplifier after the band split into different voices, different sizes are sent to the single speaker, the performance of its should be. This emerging multi-way speaker combinations, or Passive crossover components composed of: L / C / R,, L inductance, C capacitance, R resistance, according to the components of the flexible use of frequency division in the frequency characteristics of the network. L inductance: higher frequency of its characteristic is blocked so that only lower frequencies to pass, also known as By the number of lower frequency is determined by the Inductor common materials are: hollow inductors, inductance of iron Gan oxygen, silicon inductors. Gan oxygen iron inductors, silicon inductors typically only require a high inductance value can not be obtained from the hollow inductors with low DC resistance of the occasion was used, the iron core inductor has a magnetic saturation in the high current distortion caused by the nature of the occasion, so core inductance is a product of compromise. C Capacitance: the opposite of its characteristics and inductance, which is the stop frequency is so high frequency is known as By the number of high-frequency capacitance by the capacitance C decision. The unit is Capacitor materials a large variety of passive crossover for use in the capacitor polarity.
inputs and outputs are clearly visible part of the application of crossover
capacitor in the passive crossover in the high range for the range and must be carefully considered on the material, because the relevance of the absolute sound quality, choice capacitance of the material properties are usually single speaker and capacitance by the loss factor, phase loss and price decisions. Alt domain of not more than 30μF capacitance material can be better taken. R Resistance: No cutting frequency characteristics, and applications in passive crossover with inductors, capacitors mix and match for a particular frequency and bandwidth to do amendments to equalization curve, sensitivity change of use. Speaker crossover can be divided into tandem crossover, two parallel crossover. Parallel crossover by an absolute majority to become the best speaker crossover selection, the advantage of multi-way system that can be treated as an individual, and any change in one component may affect the high-pass or low pass characteristics. Commonly used passive crossover slopes can be divided into four kinds: first-order slope of 6dB, second-order slope of 12dB, third-order slope of 18dB, fourth-order slope of 24dB. About Active crossover network, also known as active electronic crossover. Because the space inside the car body, speaker installation point, in practice the utilization of the factors that have their existence can not be changed, dumped by electronic crossover with the characteristics of flexibility in the various segments of the crossover frequency, phase, Q value changes when to the best band adjustments, to overcome all kinds of vehicle variables, in order to achieve the best listening environment for the purpose of the car. Electronic crossover is low pass, band pass, high pass filter is formed. Active devices in electronic crossover vehicle between the host and the amplifier, electronic crossover can be two-way to multi-way type, but out of the points are each-way shall not be subject to a signal amplifier, If the sub sounds way more the same amplifier will increase. Active electronic crossover advantages of an increased dynamic range of 2, shape up shoes, 3, skechers outlet, to improve the ability of transient performance, get better on the subwoofer and is compatible with the expansion of the full power of 4, single speaker between the sensitivity of different questions susceptible Control 5, amplifiers work over a fixed band distortion can reduce the number of cut-off 6, the lower impedance changes, get better connected in the general classification of the performance of the top crossover vehicles have eight terminals. English is the input divider labeled , WOOFER two terminals, TREBLE has four terminals, one is negative, the gain of the three is to enhance treble and attenuation joints, respectively, +3 db, 0db,-3db. Connection is: the host incoming connection INPUT subwoofer input signal received WOOFER BASS treble then bass then TREBLE positive sense of personal lyrics, then +3 db, 0db,-3db. Atlas Atlas entry for more extended reading: 1
tuning skills refer to the relevant books
Open Category: hardware, video, speakers, communication technologies, communication theory and basic techniques to improve my device
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11-08-2011, 05:58 AM
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#3
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General of the Army
Join Date: Feb 2011
Posts: 1,659
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企鹅amyang分享
1、一只企鹅去偷东西,结果被人发现, Prada Sunglasses,报警后被JC包围了,企鹅灵机一动拿起个黄色的圆盾牌, Prada Shoes Online,光明正大的从JC面前走过
结果一堆JC一拥而上把企鹅抓住打了一顿
企鹅一脸无辜的叫着:
“为什么你们看得到我???为什么你们看的到我????????我TMD不是隐身么????? 我TMD不是隐身了么???????”
2、 企鹅GG和企鹅MM去约会,企鹅MM还没有到约会的地点,企鹅GG就一直在
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
左看看、右看看、
企鹅MM来了看见企鹅GG这个样子,怒了
一个巴掌呼了过去
骂道:
“你以为NTMD在登陆啊!!你以为NTMD在登陆啊!!你以为NTMD在登陆啊!!你以为NTMD在登陆 啊!!你以为NTMD在登陆啊!!你以为NTMD在登陆啊!!你以为NTMD在登陆啊!!你以为NTMD在 登陆啊!!”
3、圣诞节到了, Prada Mens Shoes,企鹅GG为了讨好企鹅MM,特意还穿了一身红衣服去约会
结果, Prada Sunglasses 2011,企鹅MM又是一巴掌呼了过去
骂道:
“就你TM是会员啊!!!就你TM是会员啊!!!就你TM是会员啊!!!就你TM是会员啊!!!就你TM是 会员啊!!!就你TM是会员啊!!!就你TM是会员啊!!!就你TM是会员啊!!!”
4、一天企鹅GG去约会,戴了个黄色的眼镜。到了地点,一直等一直等一直等,等了好久企鹅MM也没出现。企 鹅GG急了,给企鹅MM打电话, Prada Bags 2011,问:“我都到了一小时了,你怎么还没来?”
结果一个耳光扇过来,企鹅听见身边有人说:
“我TMD不是对你隐身可见了么!!!我TMD不是对你隐身可见了么!!!我TMD不是对你隐身可见了么! !!”
谨以此献给我使用了多年的。。你知道的….
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本文转载自:我们爱讲冷笑话: 企鹅GG和企鹅MM的故事
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11-08-2011, 06:24 AM
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#4
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Commander In Chief
Join Date: Oct 2010
Posts: 1,872
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48552 2010 年 08 月 30 日 00:51 Reading (loading. ..) Comments (3) Category: Dragon in the world
This serial number of the questions a bit like the civil service, but it is swimming in this series of numbers, each time as a coach, I can always figure out a lot to explore, though sometimes very shabby.
8.28 a swim in my usual role of team leader, though mixed with the ocean out of the University, although that summer is also the test by swimming, but the next six years, I have not had swimming pools. The five hundred people across the company, a question that few could swim, and will mostly pregnant swimming, swim and do not have signed up pregnant after sudden abstention, and we are not the perfect plan to departure only remaining three, only two athletes, three men put a bag, a quick look the same as for committing the crime.
brother driving a commercial vehicle with the right to open truck, I do not know if he usually opened Honda to do, according to his driving style, to open the Japanese car is very dangerous, from Zhongshan to Hong Wave Hill, 160 km journey, I sat in the co-pilot position, want to sleep, but sleep high. To the airport at high speed, navigation, and the town, said here, my mind,
spent two hours and forty minutes, we finally arrived Hongbo Villa, the other branch colleagues to simplify it as let alone a bird skin. Sudden decrease in the number of night, the scheduled meal standard can not be changed, mulberry bag, it is impossible to take to a table so that three people eating the food ... ...
at three tea drink, tea portable hand injury since last year had no chance when used after the appearance of this readily brought flowers, but unfortunately the room floor lamp is broken, inadequate lighting, Paowan the first water, careless sweep of ceramic lid by hand, hand-pick a few times brighter brother, helpless cover too naughty, not let him pick, jump three times directly after landing, broken ... ...
next morning, swimming pool surrounded by a sea of people, but there is no legend of the beautiful scenery, often in this environment, the quality of level with the basic fabric is directly proportional to the number.
faced with a total score calculated group game, we were a single potential thin, unable to participate in group projects, one can arrange for a freestyle and breaststroke ... ... sign, I allow staff to cross out the names of absent, how very strange the other projects are not even fun to participate, I said no way, only men, no woman ... ... in fact, not only the badminton competition, swimming, table tennis, and so the next event, I would like to phenomenon is certainly playing its influence slowly.
first project was the breaststroke, the game is to dive the way I used to watch people diving on television, just like always think that diving is as easy as jumping rope, but back to real life, only to find diving is a very evil thing because, paul smith sale, according to Liang brother said people usually swim diving places is prohibited and may be afraid to jump the dead, does not rule out because they are afraid of people killed, but this morning, I do realize that this action is really what the audience pieces of a very pleasant, we display the shark type, a dog-style, sumo-style, and so the position, quite humorous. In addition to diving posture
, the mass looting jump is also very pleasant thing, grab jump much more interesting than a false start, after all, once formed diving this action can not come back, gravity will let you in a reluctant way into the water, and this process can only produce a general position, that is, putting on five, or Wumafenshi, handbags online, in short, that five or six limbs are separate.
But when it comes to grab jump, I think the referee a lot of responsibilities, such as preparation time interval with the shots too long, players hear the After kicking his legs until he heard gunshots and found his jump too early, when the subconscious mind to recover the action, but too late, people can only fall into the water. The same group of people usually find someone moved the body, fear can not keep up, but also follow the jump, often happens after a grab people jump into the water while a chain reaction, abnormal spectacular. Of course does not rule out the referee determined to delight the public, I think you can have.
breaststroke race gap significantly, many people stopped to swim to half, paul smith bag, take a break to swim slowly, the shore heard cheering from time to time, after all, some people rely on willpower to swim 50 meters, burberry handbags, for these people, we should be commended. I think back to the University of swimming lessons, Ocean University, students must swim test, the teacher said the exam is the breaststroke, so many people swimming lessons twice a week only to learn all the breaststroke, learned six months, the teacher said the exam Tour 10 meters to pass, burberry bags, the results were found to dive out of a jump five or six meters away, hands and feet move a bit to pass the ... ...
brother freestyle competition we sent light, bright brother live up to expectations, took a sixth place, access a certificate and an envelope, the ranking points for the company won the 3 groups, and this is our only 3 points, 3 points eventually routed to all 17 teams in the first 11, but looking back, we total of only two people, , heard here I have a feeling of late meet, I remember when my brother is also with the promise of the tennis elective impulse, then how do I pull out the sound to difficult, often pull back to focus on looking for the ball to do , the cost is too high, wanted to explore after graduation, graduates return home that day who knows even the racket have been promised my brother in a train on the left, lost the match ... ...
very quickly, three hours less than they have all comes to an end, when we lunch with comrades at the same table, Foshan, they said this because the less a lesbian, the results of this plan and only 2 points, fell from fifth last year, the ten year two ... ... so that women sometimes do very troublesome.
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