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試圖運行RecognizeUsingWebSocketsExample提供IBM沃森SpeechToText的Java SDK，但它未能建立有效的RecognizeOptions對象爲在分發提供樣品.wav文件：IBM沃森文字轉語音的例子不接受AUDIO_WAV爲contentType中
Exception in thread "main" java.lang.IllegalArgumentException: When using PCM the audio rate should be specified.
at com.ibm.watson.developer_cloud.util.Validator.isTrue(Validator.java:38)
at com.ibm.watson.developer_cloud.speech_to_text.v1.RecognizeOptions$Builder.contentType(RecognizeOptions.java:95)
at com.ibm.watson.developer_cloud.speech_to_text.v1.RecognizeUsingWebSocketsExample.main(RecognizeUsingWebSocketsExample.java:30)
看來內容類型（HttpMediaType.AUDIO_WAV）被誤解爲RAW。下面是實際的（未修改從發行）代碼：
package com.ibm.watson.developer_cloud.speech_to_text.v1;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import com.ibm.watson.developer_cloud.http.HttpMediaType;
import com.ibm.watson.developer_cloud.speech_to_text.v1.model.SpeechResults;
import com.ibm.watson.developer_cloud.speech_to_text.v1.websocket.BaseRecognizeCallback;
/**
* Recognize using WebSockets a sample wav file and print the transcript into the console output.
*/
public class RecognizeUsingWebSocketsExample {
private static CountDownLatch lock = new CountDownLatch(1);
public static void main(String[] args) throws FileNotFoundException, InterruptedException {
SpeechToText service = new SpeechToText();
service.setUsernameAndPassword("<username>", "<password>");
FileInputStream audio = new FileInputStream("src/test/resources/speech_to_text/sample1.wav");
RecognizeOptions options = new RecognizeOptions.Builder()
.continuous(true)
.interimResults(true)
.contentType(HttpMediaType.AUDIO_WAV)
.build();
service.recognizeUsingWebSocket(audio, options, new BaseRecognizeCallback() {
@Override
public void onTranscription(SpeechResults speechResults) {
System.out.println(speechResults);
if (speechResults.isFinal())
lock.countDown();
}
});
lock.await(1, TimeUnit.MINUTES);
}}
我使用的是3.0.0-RC2快照。運行不使用RecognizeOptions的示例（如SpeechToTextExample）沒有問題。謝謝。
-rg