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Crown CM-700, Инструкция по применению

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131374-1

 6/00

Crown International, Inc
P.O. Box 1000, Elkhart, Indiana 46515-1000
(219) 294-8200 Fax (219) 294-8329
www.crownaudio.com

© 2000 Crown International, All rights reserved.
PZM

® 

, PCC

®

, SASS

® 

and DIFFEROID

®

,

 

are registered trademarks of

Crown International, Inc. Also exported as Amcron

®

Содержание CM-700

Страница 1: ... P O Box 1000 Elkhart Indiana 46515 1000 219 294 8200 Fax 219 294 8329 www crownaudio com 2000 Crown International All rights reserved PZM PCC SASS and DIFFEROID are registered trademarks of Crown International Inc Also exported as Amcron ...

Страница 2: ...he coil vibrates in the magnetic field and generates an electrical signal similar to the incom ing sound wave A ribbon microphone works the same except that the diaphragm is also the conductor It is a thin metal foil or ribbon suspended in a magnetic field In a condenser microphone Figure 2 a diaphragm and an adjacent metallic disk backplate are charged to form two plates of a capacitor Sound wave...

Страница 3: ...nt of the microphone Sounds approaching the side of the mic are rejected by 6 dB sounds from the rear 180 degrees off axis are rejected 20 to 30 dB The supercardioid rejects side sounds by 8 7 dB and rejects sound best at two nulls behind the micro phone 125 degrees off axis The hypercardioid pattern is the narrowest pattern of the three 12 dB down at the sides and rejects sound best at two nulls ...

Страница 4: ...is used mainly for distant miking say for dialog pickup where you want the mic to be off camera It is highly directional at high frequencies and hyper cardioid at low frequencies The longer the shotgun mic is the more directional it is at mid to low frequencies Fig 5 Shotgun microphone and its polar pattern FREQUENCY RESPONSE Each microphone has a different frequency re sponse which indicates the ...

Страница 5: ... are boundary microphones Crown GLMs CMs and LMs are free field microphones Fig 10 Unidirectional boundary microphone The PCC Figure 10 is a unidirectional boundary microphone When you place it on a surface it has a half supercardioid polar pattern The rugged PCC 160 is especially useful for stage floor pickup of drama and musicals the PCC 170 has a sleeker look for miking a group discussion at a ...

Страница 6: ...cy response in mono or stereo That s because there is no spacing between the mic capsules If there were a spacing this would create a delay between left and right signals which can cause phase cancellations in mono The Crown SASS stereo microphone explained next has spaced mic capsules but is still mono compatible because of its special design Fig 14 15 SASS P MKII stereo microphone The Crown SASS...

Страница 7: ...ioid patterns reject reverb more than cardioid Cardioid and bi directional pat terns reject reverb equally well and more than an omni The table below tells how many dB of reverb rejec tion you can expect from various polar patterns compared to an omni directional pattern at the same working distance Omnidirectional 0 0 dB Cardioid 4 8 dB Bidirectional 4 8 dB Supercardioid 5 7 dB Hypercardioid 6 0 ...

Страница 8: ...ns distances from the sound source that provide equal reverb pickup For example if an omni mic is placed 1 foot from a sound source you can place a supercardioid mic at 1 9 feet and pick up the same amount of reverb as the omni How to reduce phase cancellations between two mics If two microphones pick up the same sound source at different distances and their signals are fed to the same channel thi...

Страница 9: ... boost you hear when you mike close with a single D directional micro phone Single D means that the microphone has a single distance from its front sound entry to the rear sound entry The close the mic is to the sound source the more bass you hear To reduce proxim ity effect Use an omnidirectional microphone such as a Crown GLM 100 or PZM Use a unidirectional microphone but turn down the excess ba...

Страница 10: ...estore a natural tonal balance Recommendations for stereo TV productions Dialog that has a lot of stereo motion is distracting so record dialog in mono in the center or with a narrow stereo spread Record effects audience re action and music in stereo You can allow off cam era sounds to be imaged away from the TV screen because the screen is considered a window on a larger scene To prevent shifting...

Страница 11: ...you have more mics than inputs a combiner comes in handy This resistor network mixes the outputs of two or three mics into a single output SPECIFIC TECHNIQUES The soundtrack of most video productions has four elements narration ambient or environmental sound sound effects and music Let s look at miking techniques for each of these Announcer In these examples we ll assume it s all right to see the ...

Страница 12: ... Figure 26 left side For more flexibility in post produc tion use a SASS several feet away for ambience Fig 26 Two ways to pick up an announcer and ambience with a SASS MK11 stereo microphone Dialog at a video shoot In this case you don t want to see the microphone on camera Shotgun microphone The most common choice is a shock mounted shotgun mic placed above the actor and in front as close as pos...

Страница 13: ...28 Miking an interview with a handheld mic If you want to omit the handheld mic because it is intimidating try a PZM in your shirt pocket If background noise is excessive try a handheld uni directional dynamic microphone variable D design with a foam windscreen Place it close to the mouth Group discussions If the group is seated at a small table try a PZM 6D in the center of the table Figure 29 If...

Страница 14: ...ed with a another mic aiming at the crowd To pick up the floor action use a shotgun mic operated by a person seated in the bleachers This person should follow the action with the shot gun mic If you don t want to use an operator mount a shotgun microphone on each backboard support aiming at the action on the floor Try one or two PCC 160s just outside the court To pick up backboard sounds tape a PZ...

Страница 15: ... motion not a spaced pair of mics With the spaced pair sounds may jump from speaker to speaker as the sound source moves Audio people at the Indy 500 used a SASS to record a promo for the Dodge Viper pace car Movies such as Days of Thunder and Hunt for Red October em ployed the SASS for sound effects pickup Security and surveillance A microphone designed for this purpose is the Crown PZM 11 It can...

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