Sine-wave speech can be thought of as a sort of auditory illusion, a sensory edge case in which one’s experience has a clear “before” and “after” moment, like going through a one-way door. Sine-wave ...

Testing audio-noise-reductioncircuits, PLLs (phase-lockedloops), and audio-frequency filters mayrequire a noisy sine wave, one that issummed with white noise. Using a typicalcomputer sound card, free ...

Curious about how to make music with raw oscillators and other pieces of exotic Cold War-era test equipment? Don your lab ...