| the acoustic role of tracheal chambers and nasal cavities in the production of sonar pulses by the horseshoe bat, rhinolophus hildebrandti. | the acoustic role of the enlarged, bony, nasal cavities and rigid tracheal chambers in the horseshoe bat, rhinolophus hildebrandti (fig. 2) was investigated by determining the effect of their selective filling on the nasally emitted sonar pulse and on the sound traveling backwards down the trachea. normal sonar signals of this bat contain a long constant frequency component with most energy in the second harmonic at about 48 khz. the fundamental is typically suppressed 20 to 30 db below the leve ... | 1988 | 3397922 |