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AI Engineering
Hacker News·16d ago·5 min read
Less Is More: Why Audio on SoundCloud Looks Different
TL;DR
SoundCloud upgraded its AAC encoder to Fraunhofer’s libfdk_aac, enhancing audio quality while removing high-frequency content above 17 kHz. This change may appear as a downgrade when viewed on a spectrogram, but it actually improves perceptual audio quality.
✦ Why It Matters
Audio engineers should evaluate their encoding settings to prioritize perceptual quality over retaining all frequency ranges.
Key Takeaways
- Utilize the new AAC encoder for better audio quality.
- Understand the tradeoff between high frequencies and mid-range clarity.
- Focus on human hearing sensitivity when encoding audio.
- Conduct listening tests to validate audio quality improvements.
How It Works
The new encoder allocates bits across frequency bands, sacrificing high frequencies to enhance clarity in the mid-range where human hearing is most acute. By applying a low-pass filter, it reduces distortion in audible frequencies, optimizing the overall sound quality.