Robot speech recognition and interaction technology implemented in Java

The emergence of robots has brought a lot of convenience to mankind, and has a wide range of applications in both social entertainment and industrial fields. The development of speech recognition technology has provided new possibilities for robot interaction. In this regard, Java, as a popular programming language, also plays an important role in the implementation of robot speech recognition and interaction technology.

Speech recognition technology in Java can be implemented by referencing external speech recognition API. Microsoft's Speech API, Baidu and iFlytek all provide free speech recognition APIs. We only need to call the API through the Java program according to the relevant documents provided by the API to realize the robot's speech recognition function.

For example, the speech recognition API provided by iFlytek can be called through the following Java code:

private String recognize(byte[] bytes) {        
        try {
            String result = "";
            String url = "http://api.xfyun.cn/v1/service/v1/iat";
            byte[] data = bytes;
            String curTime = System.currentTimeMillis() / 1000L + "";
            String param = "{"engine_type":"sms16k","aue":"raw"}";
            String paramBase64 = new String(Base64.getEncoder().encode(param.getBytes()));
            String checkSum = DigestUtils.md5Hex(base64ApiKey + curTime + paramBase64);
            URL realUrl = new URL(url);
            // 打开和URL之间的连接
            HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();
            //设置请求头
            conn.setRequestMethod("POST");
            conn.setRequestProperty("X-Appid", appId);
            conn.setRequestProperty("X-CurTime", curTime);
            conn.setRequestProperty("X-Param", paramBase64);
            conn.setRequestProperty("X-CheckSum", checkSum);
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded; charset=utf-8");
            conn.setDoOutput(true);
            conn.getOutputStream().write(data);
            // 打印请求结果
            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = conn.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"));
                StringBuilder resultBuffer = new StringBuilder();
                String line = null;
                while ((line = reader.readLine()) != null) {
                    resultBuffer.append(line);
                }
                result = resultBuffer.toString();
                reader.close();
            }
            return result;
        } catch (Exception e) {
            logger.error("Exception: {}", e);
        }
        return null;
}

After calling the speech recognition API, the robot can convert human voice signals into text and respond accordingly processing. Robot voice interaction can also be implemented through Java. In Java, you can use the Java Speech API (JSAPI) to implement robot speech synthesis technology.

JSAPI is a standard for the Java platform, used to implement robot speech recognition and speech synthesis. JSAPI provides a standard interface that allows developers to easily interact with different speech synthesis engines. Third-party speech synthesis engines such as Changchao also provide Java SDK, allowing Java developers to use the interfaces they provide to implement the robot's voice interaction function.

For example, using the Changchao speech synthesis engine for speech synthesis can be called through the following Java code:

public void speak(String text) {
    try {
        Token token = new Token(appKey, appSecret);
        String speechUrl = "http://api.changchun.igroups.cn/synth";

        String body = "{"s":"" + text + ""}";
        OkHttpClient client = new OkHttpClient();
        Request request = new Request.Builder()
                .url(speechUrl)
                .post(RequestBody.create(MediaType.parse("application/json"), body.getBytes("UTF-8")))
                .addHeader("Authorization", token.getToken())
                .addHeader("Content-Type", "application/json")
                .addHeader("User-Agent", "Mozilla/5.0")
            .build();
        Response response = client.newCall(request).execute();
        if (response.isSuccessful()) {
            InputStream inputStream = response.body().byteStream();
            AdvancedPlayer player = new AdvancedPlayer(inputStream);
            player.play();
            inputStream.close();
        } else {
            logger.error("Response code: {}, message: {}", response.code(), response.message());
        }
    } catch (Exception e) {
        logger.error("Exception: {}", e);
    }
}

In the above code, OkHttpClient is used to call the speech synthesis API of Changchao, and the input The text is converted into a speech stream and played back. Using Java to write speech synthesis technology can make robots more like humans and increase the interaction and practicality between humans and machines.

In short, Java, as a support platform for speech recognition and interaction technology, brings more possibilities to the development of robots. By calling existing speech recognition and synthesis APIs, combined with Java's rich syntax and features, more humane and intelligent robot applications can be realized.

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