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Hacker News·Sep 8·5 min read
Hacker News·Sep 8·5 min readZX Spectrum: Experimenting with 1-Bit Sound
TL;DR
Implemented routines for multichannel sound on the ZX Spectrum's 1-bit beeper, achieving chord playback and exploring pulse code modulation techniques. Despite challenges, valuable insights were gained for sound synthesis.
✦ Why It Matters
Experiment with 1-bit sound techniques to enhance audio capabilities in retro computing projects.
Key Takeaways
- Explore PCM and PWM techniques for sound generation.
- Implement multichannel sound for richer audio experiences.
- Utilize cycle counting for precise timing in audio playback.
- Experiment with arpeggiation and software mixing for improved sound quality.
How It Works
The ZX Spectrum's 1-bit speaker can generate sound by rapidly switching the speaker on and off, controlled by precise timing. PCM samples audio waveforms as a series of values, while PWM adjusts the pulse length to control audio strength, allowing for better sound quality.