录制音频时如何将录音设置更改为16Khz和16位? [英] How to change audio recording settings to 16Khz and 16 bit when we record audio?

问题描述

我有如下所示的设置.

我想在录制音频时将音频录制设置更改为16Khz和16位.

I want change audio recording settings to 16Khz and 16 bit when we record audio.

NSArray *dirPaths;
NSString *docsDir;

dirPaths = NSSearchPathForDirectoriesInDomains(
                                               NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir
                           stringByAppendingPathComponent:@"sound.wav"];

NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];

NSDictionary *recordSettings = [NSDictionary
                                dictionaryWithObjectsAndKeys:
                                [NSNumber numberWithInt:AVAudioQualityMin],
                                AVEncoderAudioQualityKey,
                                [NSNumber numberWithInt:16],
                                AVEncoderBitRateKey,
                                [NSNumber numberWithInt: 2],
                                AVNumberOfChannelsKey,
                                [NSNumber numberWithFloat:44100.0],
                                AVSampleRateKey,
                                nil];

NSError *error = nil;

audioRecorder = [[AVAudioRecorder alloc]
                 initWithURL:soundFileURL
                 settings:recordSettings
                 error:&error];

if (error)
{

} else
{
    [audioRecorder prepareToRecord];
}

如何设置这些设置?

编辑问题:

感谢您的答复，我尝试了这些方法，但对我不起作用，因为我的客户端将录制的语音(录制的语音以字节格式发送)发送到ASR引擎(自动语音识别).我没有收到相同的回复(我收到的回复音频说引号").客户说您没有以16KHz和16位采样率录制语音，这就是为什么您获得该响应的原因.但是我问他要发送到他的服务器的字节，他给出了.wav文件，它可以正常播放.但是，如果他要向ASR引擎发送相同的声音，则ASR引擎将不接受我正在发送的录音(他说ASR不会接受，因为您没有以16KHz和16位采样率录制音频).客户给出了以下回应. (但是，我尝试了您提出的所有建议)

Thanks for giving the replies, i tried those ways but it did not work for me, Because my client is sending the recorded voice(the recorded voice what i am sending in bytes format) to ASR engine (Automatic speech recognition). i am not getting back the same response (i am getting the response audio says "quotation mark") what i send . Client says you are not recording the voice in 16KHz and 16 bit sample rate thats why you are getting that response. But i asked him the bytes what i send to his server, He given that .wav file it is playing perfectly. But if the same one he is sending to ASR engine , the ASR engine not accepts the recorded voice what i am sending(He says that ASR wont accept because you are not recording audio in 16KHz and 16 bit sample rate). Client given the following response. (But, I tried all the ways suggested by you)

Filename:   sv_SE_356985580762248932.wav
Folder: E:\developApp\TestappName\Mortionsn_dev\2nd-iteration\test_wfiles
File Type:  44100Hz, 16-bit, Stereo
Uncompressed Size:  1.63 MB (1,713,696 bytes)
File Format:    Windows PCM
Windows PCM
Size on Disk:   1.63 MB (1,717,892 bytes)
Last Written (local):   3/11/2013  00:21:00.000
Length: 0:09.714
428,424 samples

使用以下答案第二次编辑问题:

稍后提供建议，我将我的设置代码更改为:

Later by giving the suggestions i changed my settings code to:

NSMutableDictionary *recordSettings = [NSMutableDictionary dictionary];


[recordSettings setValue: [NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];

[recordSettings setValue: [NSNumber numberWithFloat:16000.0] forKey:AVSampleRateKey];//8000.0

[recordSettings setValue: [NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];

[recordSettings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];

[recordSettings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];

[recordSettings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];

[recordSettings setValue: [NSNumber numberWithInt: AVAudioQualityMax] forKey:AVEncoderAudioQualityKey];

推荐答案

您现有的设置为44.1kHz和16位，因此(假设以上内容已经有效)，您唯一需要更改的行是:

Your existing settings are 44.1kHz and 16 bit so (assuming the above already works) the only line you'd need to change is:

[NSNumber numberWithFloat:44100.0] 

收件人:

[NSNumber numberWithFloat:16000.0]

这篇关于录制音频时如何将录音设置更改为16Khz和16位?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！