1. Digital Audio Recorder
Most animal bioacoustics studies require that sounds be recorded on tape and stored for future reference. Although the software system is capable of recording and saving signals directly from the microphone, DAT recorders are normally used.
Sony digital audio recorder, AT TCD-D8, This unit is small (80.8 mm x 50.7 mm x 20.5 mm) and light (.68 kg). Because of its size, the recorder can be placed virtually anywhere so it will not startle animal subjects.
Frequency response +/- 3 dB from 7 Hz to 22 kHz and +/- 1 dB from 11 Hz to 20 kHz.
Temperature 00 C to 41.10 C
Extended battery power allows the recorder to be left near the animals without the researchers present. With four AA batteries the D8 can record continuously for 4 hours. A D-cell battery pack can be made for about $5.00 that allows 10-15 hours of continuous recording or playback.
Using any portable computer with 92 mb ram, signals can be measured in the field from .01 Hz to 250 kHz using the NI DAQ 6062E PCMCIA card which samples up to 500 kbs. Desktop analysis can go from .01 Hz to 650 kHz, and more depending on the DAQ device.