Speaking of BOSE sound, this is a sound brand that most people will not be unfamiliar with. Since its founding in 1964, it has been a full 50 years of history. Looking back at the history of this half century, BOSE has developed a number of proud technologies in the field of sound.
Mr. Amar G. Bose, born in 1929, taught at the Massachusetts Institute of Technology (MIT) a Ph.D. in electrical engineering. He taught at the school for two years. In 1964, he bought a pair of stereos. He was disappointed and decided to DIY himself. Founded BOSE, a company specializing in audio technology, known for its speakers, noise reduction technology and car audio system technology. Amar G. Bose, founder of BOSE Sound, died on July 12, 2013 at the age of 83.
Mr. BOSE's life has been dedicated to his passionate career, and he has changed the lives of many people. In 2011, he donated a majority of BOSE's equity to MIT, which receives funds from the stocks each year to support teaching and research. Regardless of the evaluation of BOSE's audio technology, let us pay tribute to his own contribution to the audio industry, teaching and research.
Regarding car audio, BOSE first cooperated with General Motors in 1982 to develop car audio systems for its Cadillac models. Since then, BOSE has also developed car audio systems for Audi, Infiniti, Porsche, Nissan and other models. It can be said that BOSE has extremely rich experience in car audio.
As one of the world's first speaker manufacturers, BOSE has created countless innovative products and technology invention patents for consumers, and has won numerous awards. Today, whether at home, in the car, on the road or in public places, BOSE products have undoubtedly become a symbol of fashion and fashion.
BOSE sound analysis
BOSE has been focusing on audio for more than half a century. No matter in the personal audio field or in the car audio, there are many praised technologies. Below we will give you an analysis of BOSE's latest audio technology.
·The key to the original sound reproduction - the speaker
The speaker works by converting electrical signals into acoustic signals. It is also very simple in structure, mainly consisting of three parts: magnet, coil and 'paper cone. How did it make a sound? The electromagnetic energy passes through the electromagnetic effect, causing the cone or diaphragm to vibrate and resonate with the surrounding air to make a sound. The size of the sound is actually by changing the current, and the cone acts to amplify the sound.
·Passive dual mode resonance technology
This is a new study by BOSE and they have applied it to the new SoundLink Mini Bluetooth speaker. The benefit of this technology is that it allows smaller speakers to produce richer, fuller bass and a wider range. In addition to being used in personal audio systems, this technology is also available on the Red Flag L9 and L7 models.
·Near field speaker
What is a "near field speaker"? Simply speaking, it is the acoustic characteristics of speakers that are very close to the human ear. This research was first applied to the commercial product Auditioner computer voice simulation audition system. Then in 1997, Apple asked BOSE to customize the sound system for the 20th anniversary edition of the Mac.
BOSE applies this technology to the car, placing the speakers on either side of the front seat headrest or on either side of the shoulder to create a unique sound field for the front passengers. At present, Cadillac XTS, Infiniti Q70L, Infiniti Q60 and other models are equipped with shoulder or headrest speakers.
·AudioPilot noise compensation technology
This is one of BOSE's classic innovations. It uses a microphone installed in the car to monitor the noise level inside the car and automatically adjust the volume of the music covered by the noise to compensate for the noise generated by the car while driving and from outside the car. The impact of environmental noise.
At that time, BOSE was tailoring the sound system for the 1984 Corvette. All the sound systems at the time were analog sounds and there was no digital signal processing technology. But BOSE created a complete analog circuit set to monitor the noise level inside the car and automatically adjust the volume and pitch of the sound. However, due to the large and complex size of this analog circuit group, it was not implemented in the 1984 Corvette. Until 1997, digital signal processing technology has become powerful enough and operating costs have been greatly reduced, and noise compensation technology has been widely used in car audio systems.
BOSE car audio
BOSE not only has many excellent products in the field of personal audio and home audio, but also has the same technology and technology in car audio systems. For example, BOSE is a 5.1 surround sound system tailored for the Audi Q3. We actually listened to this sound system.
·5.1 Surround Sound System
BOSE has designed an advanced three-way speaker layout for the front seats, where the high, medium and low frequencies are covered by different speakers. This fine speaker layout delivers a clear, high-pitched, penetrating midrange. And the deep bass, even when the volume reaches the maximum, the sound will not be distorted.
Each channel audio signal is delivered to a specially selected speaker combination with the CenterPoint 2 signal, creating a 360° surround sound field anywhere in the car. The high school bass is covered by different speakers, and the sound field is immersive. The sounds of the three frequencies are very full and will not make people feel stiff.
• New generation Studio on Wheels sound system
In addition to Audi, Infiniti also has extensive cooperation with BOSE. In fact, they established a cooperative relationship as early as 1989. Today, all Infiniti models are equipped with a BOSE sound system. The new generation of Studio on Wheels sound system is the first to be used in the Infiniti Q50 sedan.
In fact, the most important part of this sound system is advanced sound field positioning technology. The feature of this technology is to restore the real sound field effect. For example, the human voice is in the middle position, and the sound of the instrument is on the left and right sides, just like listening to songs at the music festival. Combined with digital signal processing and custom equalization technology, advanced sound field positioning technology can achieve a wide sound field and accurate sound image.
I believe that after reading this article, I have a certain understanding of the technology of BOSE sound. In fact, in today's increasingly technological development, car audio and personal audio have made great progress, BOSE audio company is also constantly developing. Mr. BOSE not only changed the car audio, but also changed our life, so that the special private space of the car has been better utilized, which has brought more fun to our car life.
Product Description
SPD Surge Protective Device,Lightning Surge Protector
Surge Protection Device (SPD)
It is a device used to limiting instant surge voltage and discharge surge current, it at least including a non-linear component.
Surge protective Device Model Selection
With the impact of international information flow, the rapid development of microelectronic science and technology, communication, computer and automatic control technology, make the building start to go for high quality, high functional area, formed a new building style-intelligent building. As inside the intelligent building there are lot of information system, <<Building lightning protection design norm>> GB50057-94(2002 vision)(hereafter brief as <<lightning protection norm>>) put forward the relative requirement to install the surge protective device, to ensure the information system safely and stable running.
SPD essentially is a equipotential connection material, its model selection is according to the different lightning protection area, different lightning electromagnetic pulse critical and different equipotential connection position, decide which kind of SPD used in the area, to achieve the equipotential connection with the common earth electrode. Our statement will based on SPD's maximum discharge current Imax, continuous operating voltage Uc, protection voltage Up, alarm mode etc.
As per << Lightning Protection Norm>> item 6.4.4 stipulation "SPD must can withstand the expected lightning current flow and should confirm to the additional two requirements: the maximum clamp voltage during surge across, capable to extinguish the power frequency follow-on current after lightning current across." That is the value of SPD's max. clamp voltage add its induction voltage of two ends should be same with the system's basic insulation level and the equipment allowed max. surge voltage.
SPD for Power Supply System Series Selection Guide
The installation of SPD at each lightning protection zone, according to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the over voltage category, its insulation withstand impulse voltage level can determine the selection of SPD. According to the standard of low voltage electrical appearance, make classification of electrical equipment in accordance with the over voltage category as signal level, loading level, distribution and control level, power supply level. Its insulation withstand impulse voltage level are:1500V,2500V,4000V,6000V. As per to the protected equipment installation position different and the different lightning current of different lightning protection zone, to determine the installation position of SPD for power supply and the break-over capacity.
The installation distance between each level SPD should not more than 10m, the distance between SPD and protected equipment should as short as possible, not more than 10m. If due to limitation of installation position, can't guarantee the installation distance, then need to install decoupling component between each level SPD, make the after class SPD can be protected by the prior class SPD. In the low voltage power supply system, connecting an inductor can achieve the decoupling purpose.
SPD for power supply system specification selection principle
Max. continuous operating voltage: bigger than protected equipment, the system's max. continuous operating voltage.
TT System: Uc≥1.55Uo (Uo is low voltage system to null line voltage)
TN System: Uc≥1.15Uo
IT System: Uc≥1.15Uo(Uo is low voltage system to line voltage)
Voltage Protection Level: less than the insulation withstand impulse voltage of protected equipment
Rated discharge current: determined as per to the lightning situation of the position installed and lightning protection zone.
SP1 Series
Normal Working Conditions
-Altitude not exceed 2000m
-Ambient air temperature:
Normal range: -5ºC~+40ºC
Extend range: -40ºC~+80ºC
-Relative Humidity: 30% - 90% under indoor temperature condition
- At the place without obviously shaking and shock vibration
- Non-explosion danger medium, non-corrosion gas and dust ( including conductive dust)
Classification
-As per Nominal Discharge Current:
5,10,20,30,40,60KA(8/20µs)
- As per Maximum continuous operating voltage:
275V,320V,385V,420V,440V,460V
- As per to poles
1P,1P+N,2P,3P,3P+N,4P
- As per auxiliary functions:
a. With remote signal output ( remote alarm function)
b. Without remote signal output
Selection Principle
- The continuous applied voltage on the two terminals of SPD should not more than the maximum continuous operating voltage Uc value;
- The voltage protection level Up of SPD should less than the maximum impulse withstand voltage of the protected equipment;
- As per to the different earthing system and protection mode to select the specification accordingly;
Product Features
1, built-in over-current overheating, temperature control circuit technology.
2, the module design, easy installation, online replacement.
3, low leakage current, fast response time, low residual voltage.
4, alarm indication device, green (normal) v red (fault).
| Model/Technical Parameters | WR-B60 | WR-B80 | WR-B100 | WR-B120 | WR-B150 |
| Rated Operating Voltage Un (V ~) | 220V 380V | 220V 380V | 220V 380V | 220V 380V | 220V 380V |
| Maximum Continuous Operating Voltage Uc (V ~) kV | 385V 420V | 385V 420V | 385V 420V | 385V 420V | 385V 420V |
| Voltage Protection Level Up (V ~) kV | ≤1.8≤2.2 | ≤2.4≤2.5 | ≤2.5≤3.2 | ≤3.4≤3.7 | ≤4.0≤4.5 |
|
Maximum Discharge Current Imax(8/μ20μs)kA |
60 | 80 | 100 | 120 | 150 |
|
Nominal Discharge Current In(8/μ20μs)kA |
30 | 40 | 60 | 80 | 100 |
| Response Time | <25 | <100 | |||
| L/N(mm²)The Cross Section Of L/N Line | 16,25 | 16,25 | 16,25 | 16,25 | 25,35 |
| PE (mm²)The Cross Section Of PE Line | 16,25 | 25,35 | 25,35 | 25,35 | 35 |
| Fuse or Switch (A) | 63A | 63A | 63A,100A | 63A,100A | 63A,125A |
| The Line Section of Communication and Alarm (mm²) | ≥ 1.5 | ||||
|
Operating Environment-C |
(-40ºC~-+85ºC) | ||||
| Relative humidity 25 ºC | ≤95% | ||||
| installation | Standard Rail35mm | ||||
| Material of Outer Covering | Fiber Glass Reinforced Plastic | ||||
Surge Protector SPD,Surge Protection Device SPD,SPD
Wenzhou Korlen Electric Appliances Co., Ltd. , https://www.zjthermalrelay.com