HydrogenAudio

Lossy Audio Compression => Other Lossy Codecs => Topic started by: medo960 on 2020-12-26 10:30:50

Title: FM Vs AAC
Post by: medo960 on 2020-12-26 10:30:50
Hello Guys I have A question what is the equivalent Bitrate of AAC to get the same quality as FM ? Thanks in Advance.
Title: Re: FM Vs AAC
Post by: LithosZA on 2020-12-26 13:13:47
There isn't a magic bitrate that will make it sound like FM no matter how low you go. Lossy compression degrades the audio differently rather than simply reducing the bandwidth of the signal.

When we look at the raw bandwidth numbers for uncompressed audio:
CD Quality is Stereo, 16bit, 44.1Khz sampling rate
FM Quality is Stereo, ~12bit, ~32Khz sampling rate
Simply converting CD Audio to ~12bit, ~32Khz won't give you the typical FM radio sound since the radio stations usually filter the signal before sending it out, stuff like dynamic range compression and limiting.

I would say whatever bitrate can achieve transparency for a 32Khz sampling rate input. This is something you will have to test for yourself. It is probably going to be a bitrate that is very close to what was used for 16bit, 44.1Khz input.

However this doesn't mean that when you use that same bitrate for 44.1Khz, 16 bit input that you will get "FM quality".