Shuffle Lovers

Traditional High-end Audio Sound Bad-mouth Were Gradually Column Speaker – Audio, Mini Stereo –
“Audio industry is really to die, Monk and more meat less, competition is still fierce, too many people of this line, the market volume is limited.” In August 2009 the third Video Hand activities, Guangzhou, Shenzhen trip, many dealers so much down grievances. Sound, that in the last century 90′s much admired respected AV Reds really slowly fade in the public view? Voices in unison from the first-line recognition, the domestic brands that have also insisted on the traditional sound front lines of battle, and now number over Baizhaozhitou can also can not blame someone specific, product diversification is the current development of the common audio and video business choice.

Ebb tide after tide from the microscopic
According to the statistics, more than 3,000 different sizes along the Pearl River Delta Multimedia Speaker Manufacturers, loss-making enterprises occupy about one-third loss was 29.22%, 60% No. The lack of loud brand out of competition in the audio industry have shared the field with a love waves, landscape, Wafer in seven brands of Canada Guangzhou, China audio was acquired by light, blue light audio Shenzhen Nuorui De took over the series of mergers and acquisitions … hard to cover up the decline of domestic audio to the edge.

“Having failed to make a” one to leave the audio industry, dealers said the collapse of sound business failures, switch careers, have long been caught in the winter. Data show that the audio industry in 2004 will enter recession period, then the whole industry domestic sales fell more than 2 percent, there has been almost 5 years down the first time, the industry entered the market inflection point, officially entered the overt downturn. Since 2004, this decline has accelerated, the overall market and the local civilian audio market decline was alarming, industry-wide decline was 20% -30%, the local market compared to last year fell by as much as 50%, as the audio market leader in China Guangdong market, the proportion fell to about 25%.

2005 started to become DVD Machines and home theater products, business-oriented “Passion years.” China Audio Industry Association released the annual report of the market: the survival status of their overall poor audio, home theater is to continue to decline over 30% of the total output for the first time fell below five million pieces (sets). Anonymous a large number of brands such as wind, than the rhyme Goldsmith, the Joint Declaration, establish higher after another disappear from the dead, reflects audio industry Gloomy bleak. “In its heyday, a sound volume of business the city tens of millions a year, but now only 30 million first quarter revenue, dealers can only be withdrawn, or only to die.” The dealer said, in this case , some professional sound can only choose the city in transition, sold other Home Appliances Products. Yinchuan, Ningxia Electric

Ze-yu Yin Hongxiang manager said, “speaker industry is really not, do not make enough, also by 2.1 speaker support keep up appearances, that is, matching the speaker board with LCD. A meter or so of small speakers, Sound Column can be placed in the living room, TV’s on both sides, as Home Decorations, but also a little volume. The media do so many people, prices are cheaper, ranging from dozens to two or three hundred, the brand can count hundreds of species, a set of sound also make a 10 8, doing exhausting the competition is still fierce, you have to do Sha Tau? I now want to LCD TV Turn it on. “Yin Jingli words full of sound practitioners of frustration and hardship.

Have this feeling not only these first-line dealers who have the upstream industry chain, and even master the core technologies of Dolby, DTS, and other international giants, have felt the breath of the decline of the domestic audio industry. Than a few years ago, the last two years the two giants in the Chinese market is particularly low-key. DTS is committed to advancing the current two technologies, one Blu-ray First, the two-channel analog 5.1-channel technology, a technology before the next-generation HD DVD format against to win DVD market opportunities; the latter technology is massive and flat-panel TV business DTS Cooperation , The collection of TV company patent a magic weapon. The rapid rise in the flat TV and sound increasingly demanding circumstances, DTS saw opportunities for cooperation. Sound bad-mouthing the traditional keynote

China Audio Industry Association of the Secretary-General Jin Zhenglong embarrassing situation of domestic audio industry, pointed out that despite the many external factors, lack of product innovation and sound industry in China is still the core issue stalled.

Map] 5.1 surround sound technology design room – surround sound, mixer, audio – HC Network broadcasting industry

Writer Mr. Lin Jiangjun, the Central People’s Broadcasting Radio Recording Arts Department of Senior Engineer.

Keywords: 5.1 surround sound technology design

Note: the Central People’s Radio Concert Hall at the end of 2004 started the recording control room of the renovation project will Stereo Recording control room transformed into surround sound audio control room, now the room has been put into use. Was responsible for Organization Implementation of the reconstruction project author surround sound recordings on the control room for process design, equipment selection, etc. were summarized consolidation is expected to carry surround sound technology to provide reference counterparts.

  National Radio Hall recording control room is mainly used to record the original stereo programs to meet the needs of surround sound recording program, and Taiwan in the transformation of decision to Make Surround sound the main program, while programming the recording compatible stereo control room.

Design considerations Current 5.1 surround sound control room in one of the few, very few can learn from design data. Our main consideration in the design of several areas:

1. Craft to ITU-R BS.775-1 standard for the design basis.

2. Acoustic sound control room acoustic to meet technical requirements, such as reverberation time RT60 = 0.3? .1 S (63Hz ~ 8kHz), room noise no higher than NR-20 and so on.

3. Functions to: a large orchestra pickup surround sound, multi-track recording, surround sound mixdown and mastering the production; recording a large pipe organ music surround sound; in the whole recording process for all digital signal storage and processing; surround sound and stereo compatible, and the same program and stereo surround sound effects real-time comparison; real-time Monitor The situation inside the Concert Hall, with convenient internal communication and communication functions; recording control room, sound reinforcement room, master computer rooms and audio database to exchange data between the (analog and digital); by lifting the microphone, rod floor microphone stand and high-quality micro-capacitor microphone and stage large-scale symphony orchestra performances, recording results in ensuring the premise of guaranteed performance visual effects; be the engine room of the video and audio signals sent to neighboring rooms surround sound pre-trial hearing conducted monitoring; to the engine room of the video and audio signal sent to monitor the pitch and the concert hall monitor; multi-party teleconferencing; receiver Cable television Signal, and so on.

Based on the above considerations, we will be divided into the control room, the entire system inside and outside the control room (the Hall-house) in two parts. Internal Process Design

Hall Control room outside of technology design process is divided into two parts, electric box and microphone.

Electrical box design process Concert Hall stage in the front, middle and rear left and right, each set 3 to box, divided into the craft supply box, back box and the microphone box to send a total of 6 groups. Each group has five microphone jacks, two power outlets and two-way box to send back output. Another apron with one side also the AV outlet box to provide external playback and conventional TV signals Studio Studio monitor, so you can replay the concert hall to the sound source and the remote television network meeting.

Microphone design point Concert Hall stage and hanging internal microphone into two parts, you can also add a wireless microphone as needed.

(1) hanging microphone part of the

Taking into account the long distance transmission hanging microphone signal by the venue Light , A larger power supply and other factors, it will be hanging ceiling microphone to the microphone trace metal tube closed, and be well grounded, to minimize the interference. The same time, the microphone Amplifiers Some moved to the roof, the microphone will pick up the weak signal in situ amplification and encoded into a digital multi-channel serial bit stream (ie MADI signal), by two 75 in Coaxial cable Return the control room. MADI coaxial cable signal theory of transmission distance 50m, 40m length of the line actually thrown around, ensure the hanging microphone signal transmission quality. The microphone box MADI cable can be the last of its 56-channel mixer on a microphone channel to transmit control signals to achieve the level of the microphone, remote control interface and phantom power. Lifting the microphone point performance according to the modern symphony orchestra seating spots. To meet the practical needs of the different microphone pickup, the band hanging in front of a row of cardioid directional microphone, as the standard of the main microphone pickup AB; In addition, the famous conductor DECCA tree hanging behind the microphone arrays; also prepared a ATMOS5.1 surround sound microphone, surround sound as a single point of pickup to add.

Figure 1 stage and the location of microphone holders hanging layout

Standard microphone using the form AB, mainly taking into account the standard AB stereo recording in a sense of degree of respect and integration advantages of relatively prominent. Keep the form of AB system, microphone, on the one hand you can continue to maintain the advantages of tape recording of AB system; the other hand, a variety of recording formats in the fabric, you can be added as the main and auxiliary microphone. DECCA DECCA Tree microphone array is the company’s proven, were all highly praised recordings pickup standard, has been Expert They focus of the study, in its basic structure of T-derived variety of recording formats, selected according to the actual situation. The hanging of the main microphone while still using T-rack receiver rack, but is different in that rack installed six microphones: the forefront of MS system is a pair of stereo microphone, face the stage panoramic pick; from two 0.5m side installation of two forward a heart-shaped condenser microphone, in front of the reverberation as surround sound source; in both sides of T-rack installation and central angle of about 135? the heart-shaped condenser microphone, rear surround sound as reverberation source. T-Rack using fine wire and through arm lift, if it is pick up a regular stereo source, can be easily replaced with standard or large DECCA tree recording AB, Small AB, MS, ORTF format, etc.. ATMOS5.1 surround sound microphone pickup system from Germany’s R & D surround sound pre-amplifier, for the entire analog circuit design, can provide all current standard surround sound recording. It uses a fixed “large” type microphone stand, microphone through the cable and supporting pre-amplifiers. The microphone amplifier using the electric motor control to gain control of the central control knob can be guaranteed five simultaneous adjustment of the gain of the microphone, microphone amplifier can be directly carried out in surround sound microphone gain adjustment, distribution and output bus, audio and video electronic broadening , ultra-low sound signal and regulation, surround sound and stereo monitor, such as the conversion and operation of appropriate