"How do we distinguish sounds (continued)" Sound and environment PPT courseware 2

"How do we distinguish sounds (continued)" Sound and environment PPT courseware 2

teaching objectives

1. Know what loudness and timbre are. Know the factors that determine loudness. Understand the units of loudness.

2. Application of timbre.

3. Understand the differences in waveforms of sounds with different loudness and different timbres.

4. Experience experiments to explore the relationship between loudness and amplitude, and enhance hands-on ability.

Detection Preview Exchange Display

Communication and discussion:

1. What is loudness? What factors determine loudness?

2. What is amplitude? Compare waveforms of different amplitudes; compare people’s feelings of different loudnesses;

3. The unit of loudness; loudness is related to concentration and dispersion.

Activity: Listen carefully to what is the difference between these two sounds? Is there a difference in tuning fork vibration?

Sounds are not only high or low, but also strong or weak.

In physics, the intensity of sound perceived by the human ear is called loudness.

Loudness is commonly known as volume or sound volume

Activity 1 Explore what factors are related to loudness

(1) Sprinkle some small objects on the drum surface, knock it gently first, observe the beating range of the small objects, then hit the drum hard, and then observe the beating range of the small objects.

(2) Insert the speaker plug into the headphone jack of the VCR, sprinkle some small pieces of paper on the speaker, then adjust the volume button of the VCR and observe the vibration of the small paper pieces.

(3) How to make the drum louder?

Through the above activities, we can draw the conclusion:

The greater the vibration amplitude of the sound source, the loudness of the sound _____ Does the distance of the sound source affect the loudness?

Class exercises

1. As shown in the figure below, on the remote control of the TV, there are generally several buttons represented by the following graphics, among which the ones that control the volume (loudness) are ( )

2. Comparing the cry of cows with the cry of mosquitoes, which of the following conclusions is correct ( )

A. The sound of a cow's braying is high-pitched and loud. B. The sound of a cow's braying is low-pitched and low-pitched.

C. The sound of a cow's braying is high-pitched and low-pitched. D. The sound of a cow's braying is low-pitched and loud.

3. Doctors use stethoscopes to diagnose diseases because... ( )

A. A stethoscope can increase the amplitude and loudness of vibrations

B. The stethoscope reduces the dispersion of sound and makes it louder to the human ear.

C. The stethoscope can change the frequency of the sound emitter and make the pitch louder.

D. The stethoscope can shorten the distance between the listener and the sound source, making the vibration amplitude transmitted to the human ear larger.

4. The "high" and "low" in soprano and bass mean that the sound is _____ different, which is mainly determined by the vibration of the sound source _____.

Sound quality – timbre

It turns out that the sounds emitted by different objects have different timbres. It is determined by factors such as the material, structure of the sound body, and the way the sound is produced.

Although the sound emitters have the same pitch and loudness, the human ear can still distinguish them because their timbres are different.

The timbre is determined by the following factors

1. Sound-producing materials

2. The structure of vocalization

3. The way of speaking, etc.

Three characteristics of sound

pitch, loudness, timbre

Characteristics of sound and related factors

Common examples of describing sound characteristics:

1. Description of loudness

Deafening, sounding like a bell, singing loudly, shouting loudly

2. Description of tone

Baritone, soprano, voice as thin as a mosquito and as crisp as a silver bell

3. Description of timbre

Pleasant listening, musical instrument distinction, ventriloquism imitation

Operation:

Classwork: pages 1, 2, 3, and 4 on p38.

Extracurricular homework: basic training, inspection.

Tutorial (preview): a. Briefly introduce the relationship between sound and music; briefly introduce the relationship between sound and architecture; briefly introduce the binaural effect and its application. b. What is noise? What are the hazards? How to control noise? Team leader checks.

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