Kindly help me by telling how to use audacity 2.0.5 to meet the following requirements for the recorded audio. I am currently using windows 7 64-bit OS:
-Record the audio as wav with PCM signed 16 Bit, 48000 Hz, Mono (preferable) else stereo. Record high quality, mix down to 8Khz mono
-Filter out audio below 300 Hz and above 3000 Hz
-Keep volume levels between -6 and -9db
-Wav PCM Signed Mono
-16 Bit
-8000 Hz
-128 Kbps
-Record the audio as wav with PCM signed 16 Bit, 48000 Hz, Mono (preferable) else stereo.
Yes. Edit → Preferences → Quality. (That may not be important since you are going to downsample anyway).
Record high quality
The quality depends on your hardware and your acoustic environment. Audacity just “captures” the digital audio stream and sends it to your hard drive.
mix down to 8Khz mono
There is a drop-down box in the lower left of the Audacity Window to set your project sample rate. At the top, there is a menu button that looks like a microphone. There you can select your input and one or two channels.
-Filter out audio below 300 Hz and above 3000 Hz
Effect → High-Pass Filter at 300Hz, Effect → Low-Pass filter at 3000Hz*
-Keep volume levels between -6 and -9db
Effect → Amplify. The Amplify effect allows you to set your peak levels.** (Targeting a particular average level is trickier)
-Wav PCM Signed Mono
-16 Bit
-8000 Hz
That’s NOT standard. 8-bit WAV files are unsigned. (16-bit WAV files are signed.) You can create a RAW 8-bit signed PCM file, but it won’t have the WAV header. Export → Other Compressed Files → Options…
-128 Kbps
16-bits X 8000Hz = 128 kbps so that happens automatically.
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** With 8-bits, you don’t have a whole lot of resolution and with peaks at -6 or -9dB you are not using all of the bits and “throwing away” resolution.
Thank you so much for your kind reply.
I have followed your steps and recorded the audio accordingly. How should I check whether the sound recorded by me is matching the specifications. I am uploading the file that i have recorded.
Kindly help !!!
If you right-click over the file > Properties, Windows may or may not confirm the bit depth. You can see the sample rate in Hz if you import the file into Audacity then look above Mute / Solo to left of the waves. The bit depth there is the bit depth Audacity uses to read the data, not the actual bit depth of the file.
If you prefer, you can use “MediaInfo” from MediaInfo - Download MediaInfo for Microsoft Windows to check file format informaion. Get the version without installer, because the installer may have malware.
You can check the frequency information at Analyze > Plot Spectrum… in Audacity. As you can see:
