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Finding Cuckoo Calls using Ravenlite
The Thrush detector program from Old Bird does not effectively scan for calls at frequencies below 2 kHz. To find cuckoo and other birds with calls below 2 kHz such as American Bittern, I manually scan the sound file using Ravenlite. For a sound file saved in 44,000 kHz sampling rate, 16 bit, .wav format, Ravenlite will show about 1 minute of time per screen. For a sound file saved in 22,050 kHz sampling rate, 16 bit, .wav format, Ravenlite will show about 2 minutes of time per screen. I record and save my sound files in 1 hour increments. To manually look through an hour of sound takes me about 8-9 minutes (if I'm just looking at the low frequency area and not stopping to zoom in and look at other interesting calls above 2 kHz). My current PC is a Pentium 4 purchased in early 2004. I would think that scanning the same file with a computer equipped with Pentium Duo Core processor would take even less time. |
