I usually record prompt (wav files) using Windows Sound Recorder. But I found that the quality is not very good.
So, I tried to save the wav file using the default Sound Recorder format (PCM , 44.100kHz,16 bit, Stereo) first to make sure that it's not the microphone or the environment that caused the poor quality. And the result is good.
Then, I converted the file to the format that is supported by IPCC (CCITT u-law,8.000kHz,8bit Mono). I know that the sound quality should decrease. But I'm not sure that it supposed to be as low as the result I'm getting. There are noticeable kind-of-buzzing sound on the spoken message.
So could anybody tell me what I can do to improve the quality ? What software do most people used ?
Thanks in advance.