Time Expansion Bat Detector Circuit

A time expansion detector needs some kind of memory to store the bat call.

Time expansion bat detector circuit.

Frequency divider heterodyne time expansion dsp digital signal processor. Typically the sampling rate ratios can be varied from 1 10 to 1 32. Time expansion te detectors work by digitising the bat calls at a high sampling rate and replaying them at a lower sampling rate immediately afterwards. Time expansion bat detectors.

Time expansion te detectors are broadband detectors i e. A 5 ms bat call at 40 khz would sound like a 50 ms call at 4 khz. The output is audible on a loudspeaker or headphones. They work by digitally recording a brief snatch of bat sound usually about one second and replaying it at a slower rate usually ten times slower.

Time expansion te detectors work by digitising the bat calls at a high sampling rate using an analog to digital converter and storing the digitised signal in an on board memory. Chris eve s bat detector circuit view experiment. They detect all frequencies across the frequency range within which bats are likely to be calling. Time expansion detectors work by storing the call in their internal memory and then replaying it back 10 x slower thus lowering the frequency.

Heterodyne detectors are great for beginners but professional bat workers will also turn to the more technologically advanced models which allow extensive recording and. Hand held or passive and type of technology heterodyne fixed frequency time expansion or full spectrum. A bat detector is an electronic listening device that will allow us to hear the bat chirps and buzzes. Bat sounds are heard at 1 10th the frequency and 10 times the duration so no frequency information is lost as is the case with heterodyning or frequency division.

There are several types of bat detectors being used by bat listeners.