"In a large system like the party, there must be a unified level reference, and each device can only ensure that the signal has the maximum dynamic range and the highest signal-to-noise ratio by adjusting the output and input levels in the same position......"

Cao Wu sat in front of the mixer and talked, and a middle-aged man in his thirties stood beside him, bending over like a primary school student at the moment, listening carefully to Cao Wu's speech, and carefully asking questions from time to time: "Then how can we achieve the best signal-to-noise ratio?"

"Whether it's a mixer, an amplifier, or a peripheral, the level of the input signal from the pre-amp equipment should not be too big or too small. Too large will cause signal overload distortion, too small, although there will be no overload distortion, but will cause the signal-to-noise ratio to decrease, the noise is relatively increased. Therefore, the best signal-to-noise ratio can only be achieved when the level is set to be just undistorted. ”

The teachers and classmates waiting for the rehearsal gathered around, stunned to listen to Cao Wu say some inexplicable professional terms, not knowing what to do.

The middle-aged man was a tuner sent by the media company to be responsible for debugging the equipment, but after coming to debug for a long time, either the total output signal could not come out, or the singing voice was not clear, and he couldn't get it right after a long time.

The middle-aged man called the manufacturer for consultation, and he was upset and irritable on a hot day, and for some reason, he suddenly quarreled with the other side.

Later, Cao Wu couldn't stand it anymore, so he went directly to fiddle with it a few times, and it was done in less than five minutes.

Wiping the sweat from his head, the middle-aged man humbly asked, "How should I get the level adjustment?"

Cao Wu can help him get it done at one time, but he is responsible for controlling and debugging during the performance, and it is he who responds to emergencies, so he still wants to figure out the problem and deal with it, so that it is safe.

Moreover, it was not easy to meet a technical god, and asking a few more questions was also very helpful to his work.

As for these teachers and students, while waiting to go!

"When adjusting the volume, the most important thing is to determine the sub-level of the channel. Cao Wu pointed to a knob and patiently explained: "Once this knob is adjusted, as long as the content of the program does not change, it must not be moved during the broadcast of the program." ”

"How do you adjust that?"

"You don't know this?" Cao Wu was depressed: "How did you learn it during technical training?"

"This ...... The technology is not at home, hehe, not at home, ......" The middle-aged man smiled awkwardly, he felt a little awkward, as if he had returned to the time when he was an apprentice to the master.

"Did you bring a test record?" Cao Wu asked helplessly.

"Bring it!"

"Find me a 1KHz 0dBu standard sine wave one. ”

"Okay!"

The middle-aged man buried his head in rummaging through the cabinets, Cao Wu leisurely nibbled on the ice cream bought by Lele, and looked at the teachers and classmates who were standing around him, a little uncomfortable.

"Teacher, sit down!" Cao Wu couldn't sit still.

Teacher Cui, who was in charge of the activity, smiled and waved his hand and said, "It's okay, you can sit down! Hurry up and debug the equipment, and everyone should rehearse quickly." ”

"Found it. ”

The middle-aged man handed over a disc.

After that, Cao Wu put in the disc with a familiar car, turned off the power amplifier, put the total output level of the mixer at 0dB, and the fader level at 0dB, and slowly unscrewed the disc, while observing the total output level meter.

The meter gradually points to 0dB, and the position of the port is adjusted.

"Alright, don't move this opening. Cao Wu said to the middle-aged man: "Try the volume effect!"

"Hey, okay!" The middle-aged man straightened up and beckoned, "Please come over and try the effect, use the maximum volume!"

The female teacher in charge of hosting stepped forward to take the microphone and read an opening sentence full of energy, the sound effect was very good, clear and rich, and very clear.

The middle-aged man was completely convinced, and even his address to Cao Wu changed: "Little master, you are too powerful, I feel that the technical personnel of the manufacturer are not as professional as you, how do you know these skills?"

"You'll know if you use it more. Cao Wu smiled.

Just kidding, he's been doing this job for more than ten years, and this little problem is trivial to him.

"That, little master, I still want to ask, why does my sometimes tune out and hit my ears?" The middle-aged man gave full play to the spirit of shameless questioning, pestering Cao Wu to ask non-stop.

"That's the midrange is too strong, and the attenuation of 1-1.25KHZ is about the same. ”

"And what about the sound explosion sometimes?"

“……”

After answering a few more questions, Cao Wu saw that he was not playing, so he had to stand up and interrupt: "Okay, it's not early, you have to hurry up and rehearse, or it's too late." ”

The middle-aged man stopped unsatisfied.

He took out a business card from his pocket and handed it to Cao Wu with both hands: "Little master, my name is Yu Shengli, this is my business card, may I ask your surname?"

"Don't give your surname Cao. ”

Yu Shengli's attitude is very respectful, this is the respect for technical talents, in their industry, Cao Wu's technical level is equivalent to the chief engineer of the steel mill to the village blacksmith shop hammer, he is not disrespectful.

"If you need anything, please call me. Yu Shengli smiled politely.

Although he knew that the small temple of his company could not recruit the great god Cao Wu, as long as Cao Wu called, he would be able to ask any technical questions in the future.

Nodding, Cao Wu put away his business card and walked towards the stage.

"Wow, Cao Wu, I knew you could tune, but I didn't expect you to be so professional, better than other professional and technical personnel!" Wang Lele licked the ice cream and came over.

Cao Wu said with a smile: "Where is he a professional and technical personnel, it is estimated that he is a halfway monk, at most he is stronger than the network management to repair computers." ”

"That's also amazing!" Lele admired it very much, and during this time, Cao Wu's professionalism had already surprised her countless times.

The bass teacher she studied with before was also a well-known musician in the province, and Cao Wu gave her the feeling that she was much stronger than that musician.

No, they're not on a level at all!

Lele didn't doubt the goal of the Black Hole Band to win the championship, with Cao Wu's thick thigh, would he not be able to win a small campus art party?

Don't be funny.

The official rehearsal of the band Coolboy is behind the Black Hole, in the penultimate number.

Zhang Haoran had a small reputation before he entered No. 8 Middle School, and his teachers and classmates also knew him well, and he had an audience base, so it was normal to place them close to the finale.

But they are not the real finale, the real finale is Fang Luxiao's guzheng solo "Alpine Flowing Water".