21. For example, a microphone converts an acoustic signal to a voltage waveform, and a speaker does the reverse. 22. The system is reversible : when the tip follows the furrow the membrane restores the original acoustic signal . 23. Particularly, the early April acoustic signals that were detected by " Ocean Shield " were publicized and described. 24. In several species of " Hypocnemis " antbirds, acoustic signals function in both intrasexual competition and mate choice. 25. Over the years dust detectors have measured, among others, the impact light flash, acoustic signal and impact ionisation. 26. Later versions of the AQS-13 were also capable of processing acoustic signals transmitted to the aircraft from sonobuoys. 27. A major thread in Robinson's work focuses on new developments in software-based computer music and electro-acoustic signal processing. 28. Studies suggest caterpillar acoustic signals are used to enhance their symbioses with ants ( see singing caterpillars ). 29. Before defecting in 1990, Donskoy helped the Soviets develop a way to detect submarines through acoustic signals , he said. 30. The interrogator transmits an acoustic signal that is received by the baseline transponders ( B, C, D, E ).
