录制.PCM音频

要录制.PCM音频，你可以使用一些音频录制软件或者编程语言中的音频录制库。以下是使用Java语言中的javax.sound.sampled库录制.PCM音频的示例代码：

import javax.sound.sampled.*;

public class AudioRecorder {

    private static final int SAMPLE_RATE = 16000;
    private static final int SAMPLE_SIZE_IN_BITS = 16;
    private static final int CHANNELS = 1;
    private static final boolean SIGNED = true;
    private static final boolean BIG_ENDIAN = false;

    public static void main(String[] args) throws LineUnavailableException {

        AudioFormat format = new AudioFormat(SAMPLE_RATE, SAMPLE_SIZE_IN_BITS, CHANNELS, SIGNED, BIG_ENDIAN);

        DataLine.Info info = new DataLine.Info(TargetDataLine.class, format);

        if (!AudioSystem.isLineSupported(info)) {
            System.out.println("Line not supported");
            System.exit(0);
        }

        TargetDataLine line = (TargetDataLine) AudioSystem.getLine(info);
        line.open(format);
        line.start();

        System.out.println("Recording...");

        AudioInputStream ais = new AudioInputStream(line);

        try {
            AudioSystem.write(ais, AudioFileFormat.Type.WAVE, new File("output.pcm"));
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("Recording stopped.");

    }
}

这段代码会录制.PCM格式的音频，并将其保存到文件output.pcm中。你可以根据需要修改代码中的采样率、采样位数、声道数等参数。