A detector of sonic and ultrasonic vocalizations with frequency readout |
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Authors: | Rex L Clarke Robert F Smith Don R Justesen |
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Institution: | 1. Behavioral Radiology Research Laboratories 151, USVA Medical Center, 64128, Kansas City, MO
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Abstract: | An electronic apparatus to detect vocalizations between 4 and 50 kHz and to provide frequency readout is described. A frequency-to-voltage converter changes vocalizations to their analog. A peak-and-hold circuit retains and gates the maximal value of this analog voltage while it is accessed by a chart recorder or computer. Provision is made to lock out noise by inhibiting the device’s response to all signals lower than those associated with a selectable cutoff frequency. In preliminary tests of the apparatus, vocal signals of two rats in a common cage were recorded while the animals were subjected to a brief, intermittent bout of faradic shock to the feet. All recorded vocalizations occurred at frequencies below 26 kHz. |
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