Android SpeechRecognizer"置信度"值令人困惑

Question

我通过Intent使用SpeechRecognizer:

Intent i = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
i.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
        RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);

i.putExtra(RecognizerIntent.EXTRA_PROMPT,
        "straight talk please");

i.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 5);
i.putExtra(RecognizerIntent.EXTRA_LANGUAGE, 
            "en-US";

startActivityForResult(i, 0);

我在onActivityResults()中得到的结果如下:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (requestCode == 0 && resultCode == RESULT_OK) {

        // List with the results from the Voice Recognition API
        ArrayList<String> results = data
                .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);

        // The confidence array
        float[] confidence = data.getFloatArrayExtra(
                RecognizerIntent.EXTRA_CONFIDENCE_SCORES);

        // The confidence results       
        for (int i = 0; i < confidence.length; i++) {
            Log.v("oAR", "confidence[" + i + "] = " + confidence[i]);
        }
    }

    super.onActivityResult(requestCode, resultCode, data);
}

但是float数组总是返回0.0,但第一个元素是这样的:

confidence[0] = any value between 0 and 1
confidence[1] = 0.0
confidence[2] = 0.0
and so on

我希望每个结果的置信度值介于0和1之间.否则它似乎没用,因为具有最高置信度的结果将是默认情况下的第一个元素,而不使用EXTRA_CONFIDENCE_SCORES.有什么我想念的吗？

此外,RecognizerIntent.EXTRA_CONFIDENCE_SCORES它应该被用于API Level 14++.但是我使用它的8个以上的API无关紧要,结果保持不变.在那一点上,文档是否过时了？

Answer 1

我没有从事过语音重组方面的工作。但是，正如您所说，您得到的浮点数组值为 0.0，这意味着float array is null. 您能检查一下 float[] 是否返回 null 或者其他吗？

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ArrayList<String> results = data\n            .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);\n\nfloat[] confidence = data.getFloatArrayExtra(\n            RecognizerIntent.EXTRA_CONFIDENCE_SCORES);\nif (confidence == null)\n{\n for (int i = 0; i < results.size(); i++)\n  {\n   Log.d(TAG, i + ": " + results.get(i));\n  }\n}\nelse\n{\n   for (int i = 0; i < results.size(); i++)\n\n   {\n     Log.d(TAG, i + ": " + heard.get(i) + " confidence : "  + confidence[i]);\n  }\n}\n

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您可以查看Greg Milette、Adam Stroud 撰写的《专业 Android 传感器编程 \xc2\xa0》一书吗？这肯定会对您有所帮助。您将在本书第 394页获得一些详细信息。

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