IPC Definitions - January 01, 2012
H04B 11/00 - Definition
This main group covers:
Transmission systems employing ultrasonic, sonic or infrasonic waves.
Attention is drawn to the following places, which may be of interest for search:
Speech analysis or synthesis; Speech recognition | G10L |
Telephonic communication | H04M |
Loudspeakers, microphones or like acoustic electromechanical transducers | H04R |
Stereophonic systems | H04S |