![]() The increase of the size each time I suspect is the artifact of resampling. The size of the new file is now about 71MB. Then I selected export, and selected level 8 16 bit FLAC again and saved as a new file. Then I've clicked the drop down menu, selected Set Sample Format, and chose 16 bit. The new file, when loaded to Audacity still shows as 24 bit PCM file. The size of the new file is about 70MB, slightly larger than the original. I've loaded the file, selected export, and chose level 8 16 bit FLAC. The original 24 bit recording is about 69MB in size. I'm a bit puzzled after experimenting with re-exporting the recording as 16 bit. On Windows 7, Direct Sound will usually produce slightly lower quality than MME. Use the operating system settings to set the data format of the sound card. For these tests, Audacity should be set to record at 32 bit float and the sample rate should match that set in the sound settings of your operating system. On many 24/96 sound cards, "big number settings actually decrease the accuracy of the conversion and increase the noise floor, so although the format is higher quality the recording itself may actually be not as good.įor the very best quality you should test different settings and see how they sound - pay particular attention to how well they cope with very quiet signals. Big numbers are good for marketing, but not necessarily the best for recording. Similarly, 96 kHz does not necessarily mean better quality than 44.1 or 48 kHz. It is also important to note that 24 bit capture does not necessarily mean better sound quality than 16 bit. The only way that I can think of that will say for sure is to look at the sample values of a recording.įor 16 bit data, there are 65536 discrete values.įor 24 bit data there are 16777216 discrete values.Īssuming the sound card does not filter out DC, if you record a gradually rising voltage (from an analogue circuit), 24 bit capture will show the samples increasing in value in smaller steps than 16 bit capture. It is not easy to determine if the actual bit depth used by the sound card D/A converters is actually 16 bit or 24 bit. I'm not sure if this is still the case as Portaudio has been updated since then. I think that the operating system settings should determine whether the sound card is capturing at 16 or 24 bit, but in previous version of Audacity on Windows it was limited to 16 bit due to a limitation of the Portaudio library (as per this discussion. However, this setting does not mean that the A/D converters in the sound card are actually working at a particular bit depth. You can set that in Edit menu > Preferences > Quality. ![]() It is generally better if 32 bit data is used as this provides highest quality during processing. If the track says 24 bit in the Info area of the Track Control Panel (left side of the track) then the data in Audacity is 24 bit. Moltenlava wrote: Is there a definitive way to determine the sampling rate of the recording? ![]()
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