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Precautions for the use of wireless microphones

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Time of issue:2022-01-14
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(Summary description)A wireless microphone is mainly composed of a transmitting part and a receiving part. The transmitter section is powered by a battery, and the microphone dynamically converts it into an audio signal. After being processed by internal circuits, radio waves containing audio information are transmitted to the surrounding space.

Precautions for the use of wireless microphones

Categories:News
Author:
Origin:
Time of issue:2022-01-14
Views:0

Information

A wireless microphone is mainly composed of a transmitting part and a receiving part. The transmitter section is powered by a battery, and the microphone dynamically converts it into an audio signal. After being processed by internal circuits, radio waves containing audio information are transmitted to the surrounding space. The receiving part is generally powered by the mains, and the radio waves advertised by the transmitting part are received by the receiving antenna. After processing by the internal circuit, the audio signal is extracted and sent to the sound reinforcement system through the output signal line, and then the wireless transmission of the audio signal is completed.

Now that we understand how it works, let's look at the dos and don'ts of using a wireless microphone.

1. Induction hardening

When using a wireless microphone, the output impedance of the wireless microphone is the same as the input impedance of the amplifier. If the mismatch ratio is above 3:1, the transmission effect will be affected. For example, when a 50Ω wireless microphone is connected to an amplifier with an input impedance of 150Ω, while the output can be increased by nearly 7Db, high and low frequency dynamics are significantly lost.

2. Work spacing and near-language effects

The working distance between the wireless microphone and the mouth is generally 750 px-1000 px. If the spacing is too far, the reverberation will increase, and the noise will increase relatively. If the operations are too close together, the signal will be distorted by being too strong, and low-frequency sounds will affect the intelligibility of speech. This is due to the "near acoustic response" of directional microphones, where low-frequency sounds are noticeably advanced when played in short time intervals. However, sometimes singers deliberately use the "close-up effect" to make their singing function more graceful.

3. Sound source and wireless microphone point of view

Every wireless microphone has its own useful point of view. In general, the sound source should be aligned with the centerline of the wireless microphone. The greater the deviation angle, the greater the treble loss. Sometimes, when using a wireless microphone, it can be relieved by deflecting it from a specific angle.

4. The orientation and height of the wireless microphone

When amplifying the sound, do not place the wireless microphone close to or aim at the speaker first, otherwise it will cause howling.

The height of the wireless microphone is determined according to the height of the sound source. Assuming one person speaks or several people sing, the height of the wireless microphone should be the same as the singer's mouth; when there are many people, the wireless microphone should be placed at the same height, and the positions of singers, accompanists and various musical instruments in the team should be properly distributed. Not too loud or too soft, all actions must be within the useful viewpoint of the wireless microphone.

When in use, the wireless microphone should be prevented from being knocked or dropped. It is not recommended to test the microphone by blowing air or tapping, otherwise it is easy to damage the wireless microphone.

When using a wireless microphone or recording speech outside, use a windshield to prevent "popping" sounds from entering the wind. The wind deflector also prevents dust from contaminating the wireless microphone.

5. Remove the battery in time when not in use

Wireless microphones (like the EK-88) are battery powered. If the voltage drops, the sensitivity will decrease and the distortion will increase. Therefore, when the dynamics become poor, check the battery voltage, turn off the power switch when the wireless microphone is not in use, and remove the battery when not in use for a long time.

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