1.0 milliseconds -- cycle time for frequency 1 kHz
1 ms -- duration of light for typical photo flash strobe
2.27 ms -- cycle time for the A above middle C in music (440 Hz). If an electric tuning device for musical instruments generates just one tone, this is probably that tone.
... holders to be unacceptable. See Professor Edward Felten's freedom-to-tinker Web site for information and pointers.
An early example of a DRM system is th ...