版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/telrob/article/details/80089684
近年来语音识别发展迅速也带动了人工智能的发展。曾经渴望自己做一个机器人，但是无奈，心有余而力不足，经过多年的积累，小白的我也能用站着巨人的肩膀上玩下机器人了。
准备工作：树莓派，音频模块，stm32单片机，百度语音识别接口，喇叭。
整体思路：
1. 由于树莓派没有ADC模块，所以这里借助于stm32的ADC模块来实现将语音信号转换成数字信号，然后通过串口传 输 到树莓派你中，树莓派你将数据组装成wave文件，便于语音识别。
2. 通过http协议将组装的语音文件上传到百度语音识别平台进行识别。文档说明（免费调用）
3. 根据识别结果做出相应的处理。
4. 对于需要播放语音时，根据百度语音合成接口合成语音然后使用mplayer播放出来。mplayer安装参考 博客
部分代码:
将音频转换成wave文件
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <wiringPi.h>
#include <wiringSerial.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include "listen.h"
//gcc -o uart uart.c -lwiringPi
typedef struct WAV_Format WAVHEADER;
#define MAX_LISTEN_SIZES 1024*70 //定义接收数据的大小
#define bty 460800//串口的波特率
struct listen*listenUart()
{
int fd,file;
char buff,buff2;
struct listen*liste=(struct listen*)malloc(sizeof(struct listen));
unsigned short size;
unsigned short*music,temp=0;
unsigned short max=0,min=0;
char*result=NULL;//存储最后的返回值
int index=0,i=0;
char stop=1;
WAVHEADER wavHead;
music=(unsigned short*)malloc(MAX_LISTEN_SIZES*2);
result=(char*)malloc(MAX_LISTEN_SIZES*2+sizeof(WAVHEADER));
if(wiringPiSetup() < 0)return NULL;
if((fd = serialOpen ("/dev/ttyAMA0",bty))<0)
{
return NULL;
printf("serial err\n");
}
//file=open("abc.wav", O_RDWR|O_CREAT);
printf("oepn success\n");
//serialPrintf(fd,"Hello World!!!");
//需要对音频信号作出处理，当大于或者阈值时开始统计,知道录制完成
int countTotal=0;
int countNumber= 1000;//统计个数
int countMax=2860;//最大值
int countMin=2840;//最小值
int startCount=1;
while(1)
{
if(index==MAX_LISTEN_SIZES)
{
break;
}
buff=serialGetchar(fd);
buff2=serialGetchar(fd);
if((buff2&0x0F0)!=0)
{
buff2=serialGetchar(fd);
}
else
{
size=buff2;
size=size<<8;
size=(size&0xFF00)|(buff&0xFF);
music[index]=size;
if(startCount==1)
{
countTotal=countTotal+size;
if(index>=countNumber)
{
int temp=countTotal/(countNumber+1);
if(temp>countMax||temp<countMin)
{
startCount=0;
//开始录音
printf(":::::%d\n",temp);
index++;
}
else
{
printf("temp:%d\n",temp);
index=0;
}
countTotal=0;
}
else
{
index++;
}
}
else
{
index++;
}
}
}
serialClose(fd);
printf("end\n");
//对音频进行放大处理
max=music[0];
min=music[0];
for(i=i;i<MAX_LISTEN_SIZES;i++){
temp=music[i];
if(temp>max)
{
max=temp;
}
if(temp<min)
{
min=temp;
}
}
size=max-min;
for(i=0;i<MAX_LISTEN_SIZES;i++)
{
music[i]=(unsigned short)((music[i]-min)*1.0*6000/size);
}
wavHead.ChunkID=0x46464952; /* "RIFF" */
wavHead.ChunkSize=sizeof(wavHead)+MAX_LISTEN_SIZES*2 -8; /* 36 + Subchunk2Size */
wavHead.Format=0x45564157; /* "WAVE" */
wavHead.Subchunk1ID=0x20746D66; /* "fmt " */
wavHead.Subchunk1Size=0x10; /* 16 for PCM */
wavHead.AudioFormat=0x01; /* PCM = 1*/
wavHead.NumChannels=0x01; /* Mono = 1, Stereo = 2, etc. */
wavHead.SampleRate=0x3E80; /* 8000, 44100, etc. */
wavHead.ByteRate=0x7D00; /* = SampleRate * NumChannels * BitsPerSample/8 */
wavHead.BlockAlign=0x02; /* = NumChannels * BitsPerSample/8 */
wavHead.BitsPerSample=0x10; /* 8bits, 16bits, etc. */
wavHead.Subchunk2ID=0x61746164; /* "data" */
wavHead.Subchunk2Size=MAX_LISTEN_SIZES*2; /* data size */
//返回数据赋值
memcpy(result,(char*)&wavHead,sizeof(WAVHEADER));
memcpy(result+sizeof(WAVHEADER),(char*)music,MAX_LISTEN_SIZES*2);
liste->length=sizeof(WAVHEADER)+MAX_LISTEN_SIZES*2;
liste->data=result;
return liste;
}将音频识别成文字
#include "convertText.h"
static Buffer *listen_buff2=NULL;
size_t listen_getData2(void *ptr, size_t size, size_t nmemb, void *stream)
{
appendBuffer(listen_buff2,ptr,nmemb);
return nmemb;
}
int listenText(char*result2)
{
listen_buff2=initBuffer();
struct listen*lsn=listenUart();
char*base;
int fileLength=lsn->length;
int result=1;
int baseSize=(lsn->length/3)*4+(lsn->length%3)*2+1;
base=(char*)malloc(baseSize);
base64_encode(lsn->data,lsn->length,base);
//发送请求
free(lsn->data);
free(lsn);
int code=initToken();
if(code==1)
{
char*token=getToken();
///开始创建json字符串
cJSON * root = cJSON_CreateObject();
cJSON_AddItemToObject(root, "format", cJSON_CreateString("wav"));
cJSON_AddItemToObject(root, "rate", cJSON_CreateString("16000"));
cJSON_AddItemToObject(root, "channel", cJSON_CreateString("1"));
cJSON_AddItemToObject(root, "cuid", cJSON_CreateString("34-68-95-91-77-43"));
cJSON_AddItemToObject(root, "token", cJSON_CreateString(token));
cJSON_AddItemToObject(root, "dev_pid", cJSON_CreateString("1537"));
cJSON_AddItemToObject(root, "speech", cJSON_CreateString(base));
cJSON_AddItemToObject(root, "len", cJSON_CreateNumber(fileLength));
char*jsonParam=cJSON_PrintUnformatted(root);
char*apiurl="http://vop.baidu.com/server_api";
CURL* curl;
CURLcode res;
// ptr = curl_easy_escape(NULL, (char *)a, asize);
curl = curl_easy_init();
struct curl_slist* headers = NULL;
headers = curl_slist_append(headers, "Content-Type:application/json");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
curl_easy_setopt(curl, CURLOPT_URL, apiurl);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 60);
curl_easy_setopt(curl, CURLOPT_POST, 1);
//http://vop.baidu.com/server_api
//CURLOPT_POSTFIELDS,CURLOPT_POSTFIELDSIZE
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, jsonParam);
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, strlen(jsonParam));
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, listen_getData2);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
cJSON_Delete(root);
curl_slist_free_all(headers);
free(token);
free(jsonParam);
if (res == CURLE_OK)
{
char*chars;
char*tempresult=(char*)malloc(listen_buff2->length+1);
memcpy(tempresult,listen_buff2->buff,listen_buff2->length);
tempresult[listen_buff2->length]=0;
cJSON *json;
cJSON * item = NULL;
cJSON*errCode;
json=cJSON_Parse(tempresult);
item=cJSON_GetObjectItem(json, "result");
errCode=cJSON_GetObjectItem(json, "err_no");
if(errCode->valueint!=0)
{
return -3;
}
chars=cJSON_GetArrayItem(item,0)->valuestring;
strcpy(result2,chars);
free(tempresult);
cJSON_Delete(json);
return 0;
}
else
{
return -3;
}
}
else
{
return -2;
}
return -1;
}主程序
#include<stdio.h>
#include<string.h>
#include "convertText.h"
#include "mp3.h"
#include "led.h"
#include "say.h"
//gcc -o robot robot.o mp3.o Buffer.o base64.o token.o cJSON.o listen.o convertText.o led.o say.o -lcurl -lm -lwiringPi -lmad
void sayChina(char*china)
{
int resp=initSay(china);
printf("resp:%d\n",resp);
if(resp==1)
{
int tte=playData("temp.mp3");
printf("tte:%d\n",tte);
}
}
int main()
{
char text[100]={0};
sayChina("你好，我是小志，有什么可以为你服务");
while(1)
{
printf(";;;;;;;;");
int code= listenText(text);
if(code==0)
{
printf("result:%s\n",text);
if(strstr(text,"播放音乐，")!=NULL||strstr(text,"打开音乐，")!=NULL)
{
sayChina("正在为你打开音乐");
musicPlayFile("mu.mp3");
}
if(strstr(text,"打开灯，")!=NULL||strstr(text,"打开，")!=NULL)
{
sayChina("好的");
printf("正在打开");
ledOn();
}
if(strstr(text,"关闭灯，")!=NULL||strstr(text,"关闭，")!=NULL||strstr(text,"完毕，")!=NULL)
{
sayChina("好的");
printf("正在关闭");
ledOff();
}
if(strstr(text,"你叫什么")!=NULL||strstr(text,"你叫什么名字")!=NULL||strstr(text,"名字")!=NULL)
{
sayChina("我叫小志");
}
if(strstr(text,"今天天气咋样")!=NULL||strstr(text,"天气")!=NULL)
{
sayChina("外面在下雨，有点冷");
}
if(strstr(text,"中午好")!=NULL||strstr(text,"中午")!=NULL)
{
sayChina("好什么啊，我还没吃饭呢");
}
if(strstr(text,"你多大了")!=NULL||strstr(text,"今年几岁")!=NULL||strstr(text,"几岁")!=NULL)
{
sayChina("我才出生，还没满月");
}
}
else
{
printf("error\n");
}
}
return 0;
}