Walt Disney has a colorist girl as an extra, and she stands in front of the camera lens.

"Ready!" Walt Disney shouted.

The scene was silent, and the photographer turned on the camera.

An assistant painter who served as a temporary site reporter held a clapperboard and shouted: "Alice in Holland for the second scene, the third shot, the fourth time!" ”

At the same time, the temporary scene reporter quickly closed the clapper in front of the camera, making a crisp clapping sound.

Walt Disney shouted, "Go!" ”

Immediately afterwards, the extras performed "Alice in the Netherlands", and various departments and units worked closely together on the filming work.

"Anna, please say something! Say anything! Li Kangping said.

Extras Anna spread her hands and said, "I don't know what to say!" ”

Walt Disney handed Anna a copy: "Anna, you can just read it to the camera." ”

Anna took it and read to the camera.

Li Kangping said to everyone: "You can also see that because the studio is full of all kinds of scenery and props, the acoustic conditions of the studio are not ideal, which is very difficult for simultaneous recording. The cartoon is mainly in the form of post-dubbing--- which is a hypothetical, and we assume that it will be like this in the future. In general, I hope that everyone can consider the technical issues of post-dubbing and simultaneous recording at the same time, and our hypothetical recording equipment can serve both animation and live-action films, so the research and development of our post-dubbing equipment and simultaneous recording equipment should be carried out simultaneously. ”

"I'm curious, what kind of technology do you use to fully synchronize the image and sound in the studio?" Walt Disney humbly asked.

Li Kangping pointed to the camera and said: "After this camera has undergone technical transformation, theoretically speaking--- of course, this is another hypothesis, the transformed camera records sound while shooting the picture, and the picture and sound are recorded on the same optical film, so that the sound and picture can be completely synchronized." The technical assumption is that we install a microphone --- also known as a microphone in a camera or next to an actor, and when the camera shoots the picture, the sound signal picked up by the microphone is synchronously recorded on the optical film, so as to form an optical sound trace that is 100% matched to the picture. In fact, there were already people who did this, and this technical principle was proposed by Edison, and Dr. Lee DeForrest used this technical principle to make the first sound film, which was shown in New York in the spring of 1923. ”

"Yes, I know about the sound movie, but what is a microphone or a microphone?" Walt Disney was very curious.

There were a lot of props in the studio, and Li Kangping took a piece of corn.

It is not fake corn, but real corn, and there are traces of gnawing on the cob.

"Let's assume that this corn is the microphone." Li Kangping explained, "Walter, you can think of the microphone as a technical upgrade of the receiver, and the microphone is a more advanced pickup device. Of course, we haven't developed a microphone yet, and I hope you can understand this form of communication that combines the imaginary and the real. ”

"Microphone, it's supposed to be this shape?" Walt Disney took the corn cob and looked at it closely, and after a long time, he rested the corn cob on the camera and said, "According to Dr. Lee, the microphone is connected to the film to record the so-called optical sound trace simultaneously? ”

"Hey, Walter, you're very smart, and you understand the technology very quickly!" Li Kangping shouted happily, and then he added: "The basic principle of pickup is as Walter you understand, but the microphone is not directly connected to the optical film, which also includes some accessories. Now, we will not discuss these annexes in detail, we will only demonstrate the feasibility in the general direction. ”

Walter thought for a moment and said, "Now that Dr. Lee DeForicester has succeeded, this pickup is technically fine. Dr. Li, what you're trying to do is improve the pickup device on the basis of this technical principle, right? ”

Li Kangping nodded and said, "That's right, that's the case." You see, Walter is the most tech-savvy of artists! ”

"Dr. Lee, I remember you said in New York that optical sound trails would take up half the width of the optical film." "If that's the case, then the length of film needed to shoot a contemporaneous sound film is doubled, does that mean an increase in the cost of filming?" ”

While artists like Walt Disney studied science and technology, engineers like Jack also learned about the art of film. This kind of cross-border exchange is very good, and it seems that the effect is good, and the artists and engineers have new harvests.

"You know, film isn't cheap." Walt Disney said bitterly, "If sound were half the width of the film, the total film cost of making a movie would have doubled!" So sound movies don't just look like they're about technology, they're about cost, or whatever. ”

Immediately, Walter said: "The sound and picture are recorded on the same film, although they are perfectly synchronized, will we face new problems?" For example, there is a scene where the picture is perfectly shot, but the sound is poorly recorded, and when the post-editing is done, the perfect picture and the poor sound are cut out together, right? ”

"Walter, you're so right, you're smarter than I thought!" Li Kangping praised it sincerely, saying: "The same camera captures both the picture and the sound, which we call 'single system'. The counterpart to 'single system' is 'dual system'. ”

Li Kangping took a metal pole more than one person high and tied the "microphone" to the top of the pole.

Immediately, Li Kangping took another wooden box, which he assumed was a "tape recorder".

Li Kangping used rope to connect the "microphone", "tape recorder", and camera, and he assumed that these very ordinary ropes were "synchronization cables".

Li Kangping held a metal pole tied to the "microphone" above Anna's head, and everyone silently observed Li Kangping's behavior except for Anna who was reading.

"Walter, you're going to add a new profession to your art team--- recording engineer. Let's say I'm a sound recordist and my pickup device is a microphone, and I hold the microphone above Anna and pick up the sound of Anna reading a book with a circular or cardioid point. Of course, in addition to Anna's voice, the microphone will also pick up the noise we don't need. ”

"I'll explain the acoustic jargon of circular direction, cardioid direction, cocktail party effect, etc., later. Now, I've picked up all kinds of sounds, what we need, what we don't. ”

"Hey, Jack, please help me lift the pole for a while!"