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In professional movies, sometimes sound is more important than image. Imagine you are watching a movie, and tolerating some image noise or distortion even during the movie is tolerable and in most cases, it is assumed that it is intentional, but hearing a strange sound and noises in the audio. It even stops you from watching the movie for a few moments. What makes it impossible is the image of something that is usually judged to be good or bad, attractive or not. Since most viewers will not notice the sound quality after watching a movie with very good sound, it means that professional sound has minimums that are unavoidable. In addition, in all film festivals, the importance and awards of the sound section are not less than the image section.

In a film, the image is the body and the sound is its soul. Having a professional image is worthless without a professional voice. That’s why the more professional the camera used, the more accurate the sound settings and the more professional the sound recording. To the extent that almost all cinema cameras do not have a built-in microphone, while in many cases the part related to the installation of professional audio equipment is designed in such a way that when recording sound completely separately and with specialized equipment that can be separated for carrying be them. Do not disturb

Some basic information about sound, microphones and recording equipment is collected here to familiarize you with some terms, recording equipment and their main types and their differences. It is expected that this information will at least help you choose the right tool for your work.
Two important points:

1) balanced or unbalanced

All high-end audio equipment uses balanced input and output lines. Unbalanced signals are formed through two-core cables (one central part and one external part) and are prone to altering audio signals and eventually creating hum, while balanced cables are made of three parts (two central parts and one external part). outer cover) are formed. One of the parts acts as a covering shield for the other two parts and prevents the interference and penetration of signals.

2) types of a pattern of receiving waves

The patterns of receiving sound waves by different microphones are different. This should be taken into account when purchasing a microphone.
Cardioid pattern:
Microphones that have a cardioid pattern reject sound around or behind the microphone. The graphic form of this pattern is similar to the number five (Persian). The ability to reject sound from behind the microphone makes the cardioid pattern efficient in situations where multiple microphones are used and do not need to occupy a lot of space. These microphones are popular both in the studio and in live performances.

– Hypercardiode and supercar diode pattern:
The polar structure of the supercardiode has more conductivity than the cardiode and the hypercardiode has more conductivity than the supercardiode. Unlike cardioid, both of these polar patterns have a sensitive section at the back that receives sound.

– Two-way pattern:

Bi-directional polar pattern microphones are equally sensitive to front and back sounds, but reject sound from the surrounding environment. As a result, their pattern is similar to the number 8, where the microphone capsule is located at the contact point of two circles, that’s why this pattern is called Figure 8.

Note: It should be noted that some microphones have the possibility to change the pattern and do not follow a fixed pattern.
1: Hum: the so-called “air noise” that is caused by the low quality of the recording equipment. Of course, Hamm can also use Ambiance 3. That means it is not always read as a disturbing sound.
2: Phantom Power: As mentioned, most professional microphones require some power to achieve the best performance. The method that transmits this required power through the microphone cable is called phantom power. Phantom Powers are available in different powers. Most microphones on the market use 48V phantom power.
3: Ambience: Ambient sound. For example, when you’re recording on the street, the sounds of cars and all the sounds that cover the environment are considered ambient.

Types of microphones:

Ribbon microphone

Ribbon microphones were the first bidirectional microphones (referring to the polar pattern) to achieve commercial success and were widely used during the golden age of radio. Today, ribbon microphones are making a comeback thanks to companies like Royer. In these types of microphones, a very small suspended element moves in a strong magnetic field. Ribbon microphones react to the speed of air molecules instead of sound pressure level.

One of these types of microphones can be called Boya BY-M1000.

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Shotgun microphone

Shotgun microphones, which are known as guns in Iran, are the most common type

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