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Figure 5


Fig. 5. Example of apparent biphonation that may involve separate portions of the vocal cords that are specialized for sonic and ultrasonic frequencies. (A) Ultrasonic recording extending to 100 kHz recorded with a custom-built ultrasonic condenser microphone. (B) Same sound showing only the `audible' frequencies recorded on a separate channel with an Audio Technica model AT835b microphone. A well-defined harmonic audible sound with a fundamental frequency (f0) of between 3 and 5 kHz is superimposed on deterministic chaos in both the sonic and ultrasonic ranges. The tonal and chaotic components are presumably generated by different oscillators. Data are from frog #2. 1 cmH2O=98 Pa.





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