1. C-POD & C-POD-F

2. C-POD-F 'Maxing-out' in noise will be much rarer.
Frequency range kHz
20-160kHz
16-220kHz
Sampling rate
on demand. 200ns resolution
1MHz with real time upsampling to 250ns resolution
Real-time sonar detection and filtering NO
YES
Waveform capture of selected train clicks
Optional acoustic release add-on
Self-adjusting threshold (user control)
Lithium batteries
Deep sleep mode
Delayed start
Acoustic Release delayed start
Environmental data, each minute
Temperature
Angle to vertical
Battery voltages recorded
YES, 1
YES, up to 3 stacks
Memory
SD card
Pre formatted. 4GB
Blank, up to 32GB
Click data
Time to 5microseconds
Envelope: amplitude of individual cycles
1st, 2nd, 5th cycles
4 peaks, 1 before and 2 after max
Wavelength of cycle before last
Cycle wavelengths
4 inter-peak intervals, 1 before and 2 after max
Bandwidth
NO (derived in post processing from above)
Duration
N of cycles
Postion of loudest cycle in click
Frequency range of cycles in click
N of amplitude reversals in click
Sonar filter triggered on this click
Selected click waveforms
YES Up to 21 pairs of amplitude and IPI
Record size
12bytes
16 bytes
Real time filtering
Weak filter, to favour longer weak clicks
Strong filter, to favour shorter loud clicks
YES, 1 step
YES, 4 steps
Bandwidth filters
One, all amplitudes
3 filters, with independent amplitude control
Automatic Thermal gain adjustment
Sonar filtering
YES, 2 independent filters
C-POD-F
'Maxing-out' in noise will be much rarer.
Acoustic release will allow light moorings, with lower servicing costs, and lower risks to users and whales.
Starting and SD card use are easier.
Better click data will enable more accurate train classification.

4. Captured waveform of a porpoise click:
New tools produce new discoveries:
Captured waveform of a porpoise click:
Porpoise clicks are downsweeps!

5. … cool data … a porpoise feeding buzz from Newquay…
these irregular spacings are just due to the screen pixel granularity

6. C-POD-F - looking inside the click:
Porpoise Dolphin

7. C-POD-F - wavenumber of loudest wave in click:
Click amplitude
Click duration clicks selected by train detection algorithm:
409 clicks logged by C-POD-F:
In 'sand clicks' and long dolphin clicks the loudest cycle is earlier. In boat sonar clicks its position is much more variable.
These additional waveform features ( from the 'F') will improve the accuracy of both the train detection and species classification.

8. …work in progress ...