When I was younger I would listen to music recorded on my phone from the radio. They were 128 kb/s, which sounds OK until you see they’re .wav files so they don’t use the bitrate effectively: just mono, 32kHz sample rate, 4 bits per sample. They sound worse than 24 kb/s MP3s!
(The SoC can and does do AMR compression when recording MPEG-4 (more specifically 3GP4, which uses MPEG-4 part 2, not the well-known AVC, which is MPEG-4 part 10) video but the manufacturer just didn’t take advantage of it, maybe the library for video recording was proprietary and the AMR codec not well documented.)
When I was younger I would listen to music recorded on my phone from the radio. They were 128 kb/s, which sounds OK until you see they’re .wav files so they don’t use the bitrate effectively: just mono, 32kHz sample rate, 4 bits per sample. They sound worse than 24 kb/s MP3s!
(The SoC can and does do AMR compression when recording MPEG-4 (more specifically 3GP4, which uses MPEG-4 part 2, not the well-known AVC, which is MPEG-4 part 10) video but the manufacturer just didn’t take advantage of it, maybe the library for video recording was proprietary and the AMR codec not well documented.)