[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
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