问题
单项选择题
ADPCM编码可以用于声音数据的压缩编码，其中的自适应特性是指利用自适应改变（）的大小，而差分特性是指（）。
而差分特性是指（）
A．对实际信号值进行量化编码
B．对预测值进行量化编码
C．对实际信号值和预测值之差进行量化编码
D．对当前信号值和下一个信号值之差进行量化编码
答案
参考答案：C
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ADPCM编码可以用于声音数据的压缩编码，其中的自适应特性是指利用自适应改变（）的大小，而差分特性是指（）。
而差分特性是指（）
A．对实际信号值进行量化编码
B．对预测值进行量化编码
C．对实际信号值和预测值之差进行量化编码
D．对当前信号值和下一个信号值之差进行量化编码
参考答案：C
| 阅读短文，判断下列句子是否正确，正确的写"T",错误的写"F"。 |
| At the weekend, Li Ping gets up at eight o'clock. He plays basketball in the morning. He has meat and rice for lunch. He goes swimming with his father in the afternoon. They go home at four o'clock. After dinner, Li Ping watches TV. Then he goes to bed. ( ) 1. Li Ping plays football at the weekend. ( ) 2. He has rice and meat for lunch. ( ) 3. He gets up at seven o'clock. ( ) 4. His father goes swimming m the afternoon. ( ) 5. He does his homework at the weekend. |