AudioSource.pitch

# [AudioSource](https://docs.unity3d.com/cn/2019.4/ScriptReference/AudioSource.html).pitch

public float **pitch** ;

## 描述

音频源的音高。

音高是一种让旋律更高或更低的品质。例如，请想象一下正在播放一个音高设置为 1 的音频剪辑。在播放该剪辑时，增加音高会使剪辑听起来更悠扬。类似地，将音高减小到 1 以下会使剪辑声音变得低沉。

```
//Attach this script to a GameObject.
//Attach an AudioSource to your GameObject (Click Add Component and go to Audio>Audio Source). Choose an audio clip in the AudioClip field.
//This script sets the pitch of the audio at the start, and then gradually turns it down to 0 as time passes.

using UnityEngine;

//Make sure there is an Audio Source component on the GameObject
[RequireComponent(typeof(AudioSource))]

public class ExampleScript : MonoBehaviour
{
    public int startingPitch = 4;
    public int timeToDecrease = 5;
    AudioSource audioSource;

void Start()
    {
        //Fetch the AudioSource from the GameObject
        audioSource = GetComponent<AudioSource>();

//Initialize the pitch
        audioSource.pitch = startingPitch;
    }

void Update()
    {
        //While the pitch is over 0, decrease it as time passes.
        if (audioSource.pitch > 0)
        {
            audioSource.pitch -= Time.deltaTime * startingPitch / timeToDecrease;
        }
    }
}
```

另一个示例：

```
using UnityEngine;

// A script that plays your chosen song.  The pitch starts at 1.0.
// You can increase and decrease the pitch and hear the change
// that is made.

public class AudioExample : MonoBehaviour
{
    public float pitchValue = 1.0f;
    public AudioClip mySong;

private AudioSource audioSource;
    private float low = 0.75f;
    private float high = 1.25f;

void Awake()
    {
        audioSource = GetComponent<AudioSource>();
        audioSource.clip = mySong;
        audioSource.loop = true;
    }

void OnGUI()
    {
        pitchValue = GUI.HorizontalSlider(new Rect(25, 75, 100, 30), pitchValue, low, high);
        audioSource.pitch = pitchValue;
    }
}
```