The human voice is generally composed of the pitch of the sound and a series of overtones. These overtones are all digits of pitch frequency, called subdivision in physics, harmonics in electroacoustics and overtone in music. It has a very important influence on the characteristics of the sound. The number of these overtones and overtone amplitude constitute the tone of the frequency characteristic curve. This curve reflects the tone of expression. For example, the piano's bass frequency is 27.5Hz, the highest frequency is 4186Hz, and the piano has more than a dozen overtones. Its high frequency can reach 10kHz-20kHz, generally can measure 16 overtones or 24 overtones. These overtones can be divided into low frequency overtones, intermediate overtones and high frequency overtones. If the low-frequency overtones of the stronger, the tone on the performance of vigorous; IF overtones relatively strong, the tone was rounded, natural, harmonious; high-frequency overtones of the relatively strong, the sound was bright, clear, resolving power Strong.
Here let us through the host, ordinary people and professional singers in three aspects to learn more about how to adjust the mixer according to the specific environment in order to achieve the perfect tone of purpose!

1. The host's tuning

      The host is mostly ladies, whose phonetic features are clear and fluid, full of expression. She can influence the mood of the audience, so tune her tone.

      Whisper tone: soft whisper, delicate feelings, can take close pickup, the microphone and the mouth close, so you can increase the intimacy, pick up slender, weak tone. The disadvantage is the existence of near talk effect, low frequency too strong.
Specific treatment:
· To attenuate LF: attenuates around 6dB at around 100Hz and attenuates to a maximum of 10dB.
For MID: 3-6dB boost at 250Hz-2kHz. 250Hz-2kHz is the language of the important frequency band.
· For HF: 3-6dB attenuation above 6KHz to reduce high frequency noise.
Host microphones Do not use the effects processor for reverb (REV) and echo (ECHO) processing, otherwise it will lose the sense of realism and intimacy.

2. The tuning of ordinary people

      In the karaoke hall, there are some singing lovers and amateur singers, there are some people just forget the entertainment, they mostly sing for themselves. Some of them did not have basic professional training, lack of singing skills, and even people with poor voice and no microphone. Among them, the male voice was prone to gurgling and hoarseness, and the female voice was prone to breathless noises and vocal noises.
To eliminate the above phenomenon using the following specific treatment
· Under 100Hz to be removed, to eliminate low-frequency noise, the sound more pure;
At 500-800Hz to a small amount of attenuation, so that the sound should not be too stiff;
Improve 3-6dB in MID frequency band, in order to enhance the brightness, make the sound clear and bright;
· Most people are low in sound and lack of loudness, so the volume should be slightly larger. The 200-300Hz range can also be increased to increase the loudness of the sound.
Amateur singer dynamic range is small, do not use automatic volume control.

3. Professional singer tuning

      There is often a professional singer in the karaoke hall, invited by a friend to the karaoke hall, sometimes singing two songs for friends and guests. Professional singers have loud voice, from the vocal, sigh, articulation, resonance singing basic skills have a certain level, and each has a certain singing style.
Tuning requirements:
· To understand the singer's timbre characteristics, network genres, high, medium and low overtone characteristics;
· To understand the singer's range and dynamic range;
· To be familiar with songs, lyrics feelings, transfer the basic techniques to be consistent with the song mood;
· Pay attention to the style of the song and singer singing mood;
· High grade microphone: wide frequency response, small distortion, big dynamic.
· Actors standing on the music scene, the use of pop music field, so that both tone sound and natural sound. Therefore, it requires the pop music has good acoustic characteristics.
Female voice: The female voice is easy to produce S sound (hiss) in the high frequency part; Attenuation 3dB at 7-10KHz can eliminate the S sound.
Male voice: The male voice field is 8 degrees lower than the female voice. The frequency is lower by one octave, attenuating by about 3 dB at 100 Hz, which can increase the definition.