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AIC23采集声音并回放,能够清晰听到,但得到的数据却都是负的

AIC23采集声音并回放,能够清晰听到,但得到的数据却都是负的,这是什么原因?

AIC23采集到的数据,如下图:

程序部分,数据长度为16位,数据用int类型存储。如下所示:
/*数字音频接口格式设置
AIC23为主模式,数据为DSP模式,数据长度16位*/
Uint16 digital_audio_inteface_format[2]={0x0e,0x53}; 

int data;
while(!MCBSP_rrdy(hMcbsp)){};
data = MCBSP_read16(hMcbsp);
MCBSP_write16(hMcbsp,data);

一般情况下,音频采集到的数据不是都正负交替的么?如下图。那么采集到的都是负数,是什么意思呢?