Introducing Dolby DOLBY, a provider of top audio codec solutions

[Home Theater Network HDAV.com.cn] Dolby is the Chinese translation of Dr. RMDOLBY in the United Kingdom. He founded the Dolby Laboratories in the United States and invented many technologies such as Dolby Noise Reduction System and Dolby Surround System. Movie sound and home audio have had a huge impact. Dolby technologies commonly used in homes include Dolby noise reduction systems and Dolby Surround systems.

course

1965 - The first Dolby A-type noise reducer (A stands for Audio Audio), which was developed to reduce noise for a variety of audio, was born. 1967 - Dolby began developing Type B noise reduction technology and decided to license Dolby technology to manufacturers.

1968 - Established a company named after Dolby Laboratories in the UK, and moved its corporate headquarters to San Francisco, California, in 1976.

1970 - Dolby begins to promote the concept of pre-recorded cassettes with Dolby B-type feature encoding.

1974 - Dolby has authorized 47 manufacturers, including all major manufacturers of consumer audio equipment.

1982 - Dolby introduces Dolby Surround, an upgrade to Dolby movie surround sound.

1984 - Dolby began working with the Chinese film industry to provide professional technical advice for China's development of the film, broadcast and consumer markets.

1991 - Developed the Dolby Surround DigitaI, the AC-3 system.

1992 - Dolby Digital Audio Coding (AC-3) was first adopted for the film, which was a sensational "Batman Returns"

1995 - Dolby Digital became the standard for NTSC DVD and ATSC Digital TV in the United States.

1997 - US President Bill Clinton awarded Ray Dolby the National Medal of Technology.

1999 - Dolby won the Emmy Award for Excellence in Technology Development for its achievements in DVD technology.

2002 - The first original car audio system with Dolby Pro Logic II technology was born (Volvo XC90)

2005 - is the 40th anniversary of Dolby's founding. To commemorate this year, it is listed on the New York Stock Exchange under the symbol "DLB".

2010 - Dolby established the Dolby China Research and Engineering Center in Beijing, the first research and engineering center of Dolby in Asia.

2013 - Dolby and United States Lucas Film Company jointly formed Shenzhen Dolby Digital Audio and Video Co., Ltd., the first step to fully enter the Chinese home theater market.

The Dolby Noise Reduction System is mainly used to reduce the noise of recording or playback. It was widely used in household recorders in the 1970s. At that time, we often found many recorders and symbols on the original soundtrack tape, which means that the machine has Dolby noise reduction, and the tape uses Dolby. Recorded in noise reduction mode. Of course, this type of audio tape can only be reproduced in a recorder with a Dolby noise reduction system to achieve satisfactory noise reduction.

The Dolby Surround System is a cinema sound system developed by Dolby Laboratories to improve stereo quality. In the stereo cinema, in order to create an immersive space for the audience, in addition to the left and right channels, there is also a center channel that enhances the sound effects on the screen and a surround that enables the viewer to feel the ambient atmosphere and special effects. Channel. This surround channel uses a number of speakers that are placed in parallel along the wall and back wall. Because multi-channel direct recording and transmission is expensive and inconvenient, in 1976, Dolby Laboratories invented the Dolby Stereo Cinema System, which denoised the left, center, right, and surround four channels in a certain way. The record is recorded in two channels. In playback, the opposite way is restored to four channels (ie 4-2-4 mode), thus achieving multi-channel and two-channel compatible transmission. In the "Star Wars" filmed in the late 1970s, the Dolby Surround System successfully achieved the synchronization of the sound direction and the movement of the picture, allowing the audience to feel the sense of position and the sense of presence of the sound from the top of the head, causing the film industry. The vibration, so this system was later widely used in cinemas.

In order to enjoy the same effect as the cinema in the ordinary family, Dolby Lab simplified and condensed the "Dolby Stereo Movie System" and introduced the "Dolby Surround System" and "Dolby Orientation Logic". Sound system." Today, Dolby amplifiers, which we often say, are mostly AV amplifiers with the Dolby Pro Logic Surround decoder and Dolby Laboratories certification.

Dolby Pro-Logic Surround is the second generation of home audio-visual surround sound system that was improved in the first generation of the Dolby Surround System. It was released in 1987. From the late 1980s to the present, it has been widely used in the recording of sound effects of video programs such as video recorders, LDs, VCDs, etc. Of course, its decoding system has naturally settled into AV amplifiers. The system has four channels of left, right, center and surround, and adopts a specially designed directional enhancement circuit, which can make a random adjustment of the relative strength of each channel according to the actual situation of the program signal, thereby The ability to reproduce the sense of sound image, the sense of direction, the sense of movement, and the original appearance of the sound field is greatly enhanced, and the "cinema" effect in the family is truly realized. As a result, Dolby Amplifier became the device of choice for people to build a home theater. Of course, it must be a disc with Dolby Pro Logic Surround to match the Dolby amplifier to achieve the desired result.

Although Dolby Pro Logic Surround has achieved a high level of performance, it still can't get rid of the limitations of analog technology. With the maturity of digital technology, in order to meet the requirements of next-generation TV broadcasting, on the basis of Dolby Pro Logic Surround, in 1994, Dolby Laboratories and Japan Pioneer Company released a brand new digitalization they developed. Multi-channel video and audio system: AudioCoding-3, named as AC-3, changed its name to Dolby Digital: DOLBYDIGITAL in 1997. It can be equipped to the cinema or to the home theater.

Dolby AC-3 is a compression/decompression system. It uses advanced digital compression technology and applies Dolby's original special technology to fully independent front left (L), front right (R), center (C), left surround (Ls), right surround ( Rs) and the subwoofer (S) six channels (5.1 channels) are compression-coded into two channels, recorded on film or DVD. During playback, it is restored to six channels for playback by the decoder. In order to achieve a wide dynamic range, high signal-to-noise ratio, high resolution, and fidelity of the signal, each channel is first recorded in a completely independent manner, and then subjected to compression coding. When compressed, Dolby Laboratories uses the basic principles of acoustic psychology to keep it quiet when there is no signal, and when it has an audio signal, it uses a strong signal to mask the noise in the hearing range and removes the human ear. The portion of the signal that is similar in frequency but small in volume and negligible. In this way, the content that needs to be processed is greatly reduced, and the AC-3 achieves high digital audio compression efficiency, but still gives a very complete and realistic feeling.

The AC-3 system is compatible with Dolby Pro Logic Surround Sound System and is superior to THX. Future home theaters should be Dolby AC-3 mainstream systems.

Dolby Digital is a high-quality digital audio encoding format that is more advanced than ever. The system is set up with 6 channels independent of each other. They are full-band left, right, center, left surround, right. Surround, plus a subwoofer channel below 120Hz, it is also called 5.1 channel. In this system, the subwoofer channel is required to be 10dB larger than the other 5 full-band channels, and the powerful bass can be obtained. The full-band 5 channel is also known as the 3/2 form, or 3/2 stereo system, which consists of 3 front main channels and 2 surround channels. Dolby AC-3 has two The outstanding features. First, the digital sound effect is extraordinary, the dynamic range is very wide, the frequency response of each channel should exceed 20kHz, has a high signal-to-noise ratio, completely independent 6-channel high-power output, no Interference from the surround back channel. Second, it has a subwoofer output and uses independent track recording, which is a digital audio signal with a cinema-like subwoofer output.

The Dolby AC-3 features full-band stereo surround, with a frequency response of (20-20k) Hz, each channel can carry different signals simultaneously. Dolby Pro Logic Surround is mono surround, each channel The frequency response range is narrow, limited to (100-7000) Hz, only left to right, front to back motion control, the separation between the channels is not high enough, the signal to noise is relatively poor. THX system is basically Dolby surrounds multi-channel, the rear surround channel is still mono only about 7kHz bandwidth, not true stereo. THX just uses a unique circuit to improve the post processing of Dolby Pro Logic, so Du Better than surround sound recording, closer to the effect of the cinema. For example, the output of the subwoofer is increased, the surround sound is stereo, the high range is corrected, etc. The Dolby AC-3 has undergone major changes. From the beginning of recording the audio signal, a new sound system - 5.1 channel is used. The subwoofer output is separated from the original 4 channels, not the sound of single track recording.

In fact, DSP and THX only meet some of the requirements of AV stereo, they produce a distortion, exaggerated sound effects. Yamaha's DSP and Dolby directional logic ball have something in common, both At the expense of the clarity of the rear channel, the audio and video resolution of the front three channels is reflected. The audio and video positioning of the non-front channel is relatively vague, and only the general film and television dialogue and a single background sound source can be used. The restoration. They all require a larger listening room. The surround speakers should be placed 1.5m or more behind the listener. Today, the Dolby AC-3 5.1 channel encoding and restoration system solves this problem better. The sound transmission of each channel is calibrated so that the sound of each channel seems to have reached the same distance through the same distance, so that a better audio effect can be produced, which gives the listener a special stimulation and input feeling. The ideal home theater effect. "Dolby Surround Sound" is also an audio format developed by Dolby. It is widely used before Dolby Digital, so many AV amplifiers have Dolby Surround Sound. However, today's AV amplifiers with Dolby Digital also generally have Dolby Surround. Du Doo surround sound also has a mode called Dolby Surround Pro Logic that provides better. Be sure to pay close attention to the LOGO and English words on the AV amplifier before buying. Please note that there are quite a lot of domestic Dolby certified amplifiers without Dolby digital decoding, just with the Dolby surround decoder.

DOLBY

Dolby Laboratories was founded by Dr. Hamilton Dolby. Dr. Dolby was born in Portland, Oregon, USA in 1933 and grew up in the San Francisco Bay Area. When he was still in high school at the age of 16, he worked at Ampex. The company is one of the first manufacturers in the United States to produce tape recording equipment. Later, he was responsible for developing the electronic circuit portion of the world's first practical video recorder developed by the company.

In 1957, Dolby graduated from Stanford University and received a Marshall scholarship from the University of Cambridge in the UK to study long-wavelength X-rays. In 1961 he received his Ph.D. in physics. In 1963, he accepted the appointment of the United Nations to India for a two-year advisor.

As an amateur recording enthusiast, Dr. Dolby has for many years recognized the damage to the recording quality caused by the noise floor when recording audio or video signals on a tape. In India he began to seriously consider a way to reduce noise without compromising the quality of the recording. His explorations became the basis for the later Dolby A noise reduction, B noise reduction and C noise reduction systems.

After returning to the UK in 1965, he established his own laboratory in London to implement the plan he had thought of in India. In 1968, a company named after Dolby Laboratories was established. Although in the first 10 years of the company's establishment, the center of work in the UK, it has always been an American company. After 1976, the company's main work was transferred to San Francisco.

In 1965, the first Dolby A-type noise reducer (A stands for Audio Audio) was produced. The system is designed for a wide range of audio noise reduction applications, especially for recording tape recorders in recording studios. By 1966, several noise reduction techniques had been introduced, but they all had to compromise the quality of the recording. So the difficulty faced by Dr. Dolby at the time was how to convince industry and potential customers of his technology. At that time, the multitrack recorder, starting from 4 tracks, 8 tracks, 16 tracks to 24 tracks, began to apply. When multitrack recording tapes were mixed, the mixed two-track masterband noise level was directly recorded compared to the two tracks. The master tape is much higher.

In January 1966, the British Department of Decca Records believed that the Dolby A-type noise reducer did function as described by Dr. Dolby, and ordered nine Dolby A301A noise reducers for the first time in 1966. In the month of recording some of the piano concertos of Mozart played by Ashkenazi in Vienna. In November 1966, Decca published the first record recorded with the Dolby A-type noise damper - the second symphony of the Mahler under the command of Sol.

Subsequently, the recording industry began to recognize and use the Dolby A type noise reduction system in large quantities. Originally used only for recording classical music, when multi-track recording technology was promoted, it was more widely used. Soon, professional and non-professionals around the world began to link Dolby to high-quality recordings.

With the eagerness to use Dolby's invented noise reduction technology for civilian recorders, Dolby Laboratories began to develop more practical civilian applications in April 1967, at the urging of a US commercial tape recorder manufacturer, KLH. The noise reduction technology, originally called the “simplified Dolby system”, became the well-known Dolby B-type noise reduction technology. When the development of Dolby B noise reduction technology was nearing completion, Dr. Dolby decided that Dolby Laboratories would not produce civilian audio products or consumer electronics, but would license Dolby's technology to the manufacturer, which is already mature. The manufacturer produces the application. By the end of 1974, Dolby Laboratories had authorized 47 manufacturers, including all major manufacturers of consumer audio equipment.

Since then, Dolby Laboratories has developed a range of technologies: C-type noise reduction, SR (spectral recording), S-type noise reduction, HXPro, Dolby stereo, Dolby Surround, Dolby Pro Logic, AC-1, AC- 2, Dolby Digital (AC-3), Dolby E. These technologies are widely used in professional and civil audio equipment, film recording, cinema playback equipment, digital broadcasting and so on.

In addition to its headquarters in San Francisco, Dolby Laboratories currently has offices or liaison offices around the world: Los Angeles, Wootton Bassett (UK), London, Brisbane, New York, Tokyo, Shanghai, Beijing, Hong Kong.

Ray Milton Dolby was born in Portland, Oregon, in 1933 and grew up in the San Francisco Bay Area. When he was 16 years old and still studying in high school, he worked in a company called Ampex. This company is one of the early manufacturers of tape recording equipment. At that time, tape-style or new-style gadgets brought from Germany to the United States after the Second World War. But the tape recorder has one of the biggest drawbacks, that is, the annoying noise. These noises are caused by the friction of the magnetic particles as they pass through the playhead, and there seems to be no way for people to take it.

In 1957, Dolby received a bachelor's degree in electrical engineering from Stanford University and immediately applied for a Marshall scholarship to study at Cambridge University in the UK to study long-wavelength X-rays. In 1961 he received his Ph.D. in physics. In 1963, he worked as a UN technical consultant and worked in India for two years.

During the university, Dolby still works for Ampex. As an amateur recording enthusiast, he began to think seriously about a way to reduce noise without compromising sound quality when he was in India. Through research, he knows that human hearing is actually "lazy". When one big and one small sounds exist at the same time, the human ear will "listen and hear" the quiet voice. For example, the neighbor's dog is called outside the house. We make the sound of the house louder, and the barking of the dog can't be heard. When the shower, the sound of the water will make us unable to hear the sound of the phone. What if the matter is reversed? If the phone sounds over the water, Dolby realizes that if the recording source greatly exceeds the tape noise, the noise is negligible. Extend this idea. If you increase the signal strength of the mute track in the recording, you can make the tape noise "disappear" from our hearing during playback. The specific method is that, through a mirroring process, Dolby designed the circuit device to restore the mute signal that was enhanced during recording to a normal level during playback, thereby reducing noise.

In 1965 he returned to the UK and established his own laboratory in London to practice his ideas in India. In 1968, a company named after Dolby Laboratories was established. After 1976, the company's main work was transferred to San Francisco. In 1965, the first Dolby A-type noise reducer was introduced. This system is a good solution to the noise generated by the tape recorder when recording the master tape in the studio. In 1966, Decca Records first applied Dolby Noise Reduction to record Mozart's piano concerto in Ashkenazi in Vienna. At the end of 1966, Decca published the first album to be recorded with Dolby Noise Reduction, the second symphony by Mahler, directed by Sol.

What really makes Dolby technology go to the public is the Dolby B noise reduction system. It is widely used in home recorders and Walkman products. When the development of Dolby B noise reduction technology was nearing completion, he made the decision that Dolby Laboratories only focused on technology, did not get involved in production, authorized the Dolby technology to the manufacturer, and then applied it to other professional manufacturers. Dolby and his lab established their own business model in a patent and technology license. This was the current defense of the past 30 years, and many companies that followed suit made a precedent.

Dr. Dolby’s concept of technology first is also reflected in the company’s composition of Dolby Laboratories today. Ke Jieming, the chief representative of Dolby Laboratories Shanghai Office, told the author that fluent Mandarin is the first person in the company. There are very few non-technical staff members like him. It is only here that due to the continuous expansion of the company's business and the demand for listing, the proportion of non-technical personnel in the company has increased slightly. Ke Jieming said that although Dr. Dolby is no longer at the forefront of technology research and development, he still maintains a strong interest in technology research and development. He will quietly walk into a technical meeting of the company, sit down behind unobtrusive people to listen to other people's speeches, and finally stand up and say what they think. “The recording industry is the first big market for noise reduction technology, and the next will be film.” Dr. Dolby later reviewed his technical decision. In the 1970s, Dolby introduced cinema sound processing equipment to the cinema industry, and film sound technology became another major area of ​​research and development for Dolby. With the global release of "Star Wars Prequel 3 - Sith's Counterattack", Dolby's recently launched Dolby Digital Cinema System has been put into use in some theaters around the world.

In the transition to digital technology, Dolby Laboratories' most successful step was to combine cinema sound technology with home applications. Through nearly free technical support and cooperation with upstream film companies, most of the current film production uses Dolby Laboratories' digital audio technology. At the same time, Dolby Digital Audio Technology has become the international standard for digital TV and DVD in the future. As part of it, basically every DVD player has Dolby Digital decoding. As a result, the patented fee for DVD players has become a major source of profit for Dolby.

Dolby’s stock market rose 35% on the first day of listing in the US. Dr. Dolby, the 71-year-old founder of the company, sold $300 million in stock, ending Dolby’s nearly 40-year history of private companies. The listing of Dolby Laboratories is also a last resort. Because Dr. Dolby is old, if he leaves Dolby Laboratories as a private company to his descendants after his death, his family will have to pay a huge estate tax that will bring the company into bankruptcy under US law. The company's listing can solve this problem.

Technical strength and forward-looking research and development are the core competencies of Dolby Laboratories. Ke Jieming, chief representative of Dolby Laboratories Shanghai Office, said. So, in the Dolby Laboratories, what kind of next-generation sound technology is being researched? Who is the opponent of Dolby Laboratories? Ke Jieming replied with a smile, of course, the company’s new technology research and development, of course, but I don’t even know details. As for the real competitors, it can be said that there is no. Because, after all, the top players in the audio field are mostly in Dr. Dolby's own database.

When Dr. Milton Dolby founded his own company in 1968, Dolby Laboratories was only a small company dedicated to "noise reduction" technology, and today Dolby Digital is the world's most advanced audio coding system. Pervasively affects everyone's life. The Dolby Digital technology originally designed for professional cinemas was ported to the home theater system, and consumers in the living room can also enjoy stunning sound effects. The digital TV wave that is popular all over the world is also inseparable from Dolby Digital technology. The United States, the European Union, Australia and other countries and regions almost use Dolby Digital as the first choice for the audio part of its digital TV transmission standard. Not only that, Dolby's latest Dolby Pro Logic II technology makes car audio a flowing melody, and Dolby Headphone technology enables traditional headphones to have surround sound.

Dolby technology has become a part of people's lives, and even without it, even the world of sound has become tedious.

In 1982, Dolby began to cooperate with Chinese cinemas. In 1998, it established a representative office in Shanghai and began to provide authorization for the use of Dolby technology in China. At present, almost every Chinese company that produces DVD products uses Dolby technology. The trademark "Dolby" is almost marked on every DVD product in China.

In fact, Dolby does not only provide technical certification services in China, but relies on its nearly 40 years of technology accumulation to provide Chinese companies with complete solutions for audio technology, helping Chinese companies develop new products and open up new markets. The new mobile DVD with built-in Dolby Headphone technology is a classic collaboration between Dolby and Chinese companies. Mutually beneficial cooperation and interdependence are Dolby's philosophy in China.

Dolby not only provides a full set of audio technology services for Chinese companies, but also Dolby will help Chinese companies enter these markets. This is the development strategy of Dolby in China during this time. In fact, many consumer electronic products all over the world use Dolby's audio technology, and Dolby certification has become a must-have for companies to enter the international market. According to incomplete statistics, Dolby Digital has been used in at least 600 million consumer electronics products, including more than 55 million digital TV sets and set-top boxes, more than 230 million DVD players and more than 39 million. Set of 5.1 home theater systems, including Marantz and Denon and other audio and video brands have a number of Dolby certification technology. There are already 58 major television stations around the world that have upgraded their programs to Dolby Digital 5.1 audio.

Dolby Laboratories believes that the ability to provide 5.1-channel audio is critical to any new consumer transmission system, including 5.1-channel audio systems for DVD-Video, DVD-Audio, gaming consoles, and personal computers. Has been widely recognized by consumers.

Dolby Digital has been selected by several international standards

The key to Dolby's wide application in various consumer electronics, TV stations, cinemas, etc., is that Dolby Digital has become the standard for international industry organizations or corporate alliances.

Dolby Digital was first selected as the standard by the Advanced Television Systems Committee (ATSC). Since then, Dolby Digital has become the International Telecommunications Union (ITU-R) standard. At the request of broadcasters in Australia and other countries, the European Digital Video Broadcasting Organization (DVB) included Dolby Digital in its standards in 1999, devices with Dolby Digital decoders and digital TV broadcasts with Dolby Digital audio. Both are compliant with the DVB standard. Of course, the World DVD Forum also uses Dolby Digital as the audio standard for its DVD products.

Dolby Laboratories has committed to the ATSC, ITU-R and DVB organizations to provide open and fair certification authority. Due to the high level of integration of the decoder chip, the cost of Dolby Digital decoding circuit applications has been almost negligible. In return for the unfavourable cost of equity, Dolby Laboratories provides patented details and practical know-how to consumer equipment manufacturers.

Working closely with Dolby enables these manufacturers to produce products that work well in the shortest possible time, dramatically reducing development costs and reducing time to market for new products. The Dolby brand on the product is considered by consumers around the world to be a symbol of high quality and reliability, adding value to DVB products, especially retail-priced set-top boxes that are very price sensitive.

Dolby Digital becomes the strongest driving force for car audio

Dolby ProLogic matrix surround technology delivers surround sound from stereo sources that don't provide Dolby Digital audio, such as videotapes, analog TV broadcasts, and music CDs. Dolby Pro Logic II and Pro Logic IIx also get multi-channel surround sound from all stereo programs without special coding. Similarly, after encoding the game and the broadcast program, the special direction effect can be obtained by the decoding function of Dolby Pro Logic II. Here, Dolby Pro Logic II and Directional Logic Iix technology are growing in the field of car audio.

ProLogic II's natural surround sound makes it perfect for use in car audio systems. Whether you're listening to FM radio, cassettes, CDs or MD discs, ProLogic II lets you drive your car surrounded by five-channel sound. The ProLogic II decoder can be added to an existing car audio system (such as an FM radio/CD player) or as a separate processor.

With the ProLogic II system in the car, you can enjoy stereoscopic and natural sound effects through its left, center, right and surround speakers, rather than just listening to the speakers as many car audio systems do. At the same time, some ProLogic II systems also provide sound field adjustment functions such as center channel width control, space control and panoramic control. With these functions, you can make special optimization adjustments according to your personal preferences.

Beginning with the introduction of Dolby B noise reduction technology for cassette tape players more than 30 years ago, Dolby Laboratories has become part of the car audio system. Today, Dolby Laboratories is creating a new era of automotive entertainment equipment. You may have experienced the powerful surround sound of surround sound in movies or at home, and today you can also experience in a car entertainment system equipped with Dolby Surround ProLogic II, DVD, or even Dolby Headphones. To the same shocking effect as in the theater, someone has vividly called it a "flowing melody."

With the development of Dolby Surround ProLogic II, Dolby Digital, MLP Lossless Compression (MLPLossless?) technology and Dolby Headphone technology, Dolby Laboratories has become the strongest driver of this high-quality automotive entertainment device innovation. .
More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.

In electrical distribution, a fuse cutout or cut-out fuse is a combination of a fuse and a switch, used in primary overhead feeder lines and taps to protect distribution transformers from current surges and overloads. We make available these fuses in varied specifications to meet the clients' different preferences in an efficient manner. China Service Cut Out Fuse,Porcelain Polymer Fuse Cut Out manufacturer, choose the high quality Porcelain Electric Fuse Cut Out,Porcelain Cut Out Fuse, etc.

We warmly welcome friends both domestic and abroad to visit our company,  if you have any questions,  please contact with us directly.

Porcelain Cut Out Fuse

Service Cut Out Fuse,Porcelain Polymer Fuse Cut Out,Porcelain Electric Fuse Cut Out,Porcelain Cut Out Fuse

FUZHOU SINGREE IMP.& EXP.CO.,LTD. , https://www.cninsulators.com