The Topic

1
Frog Call Sound Recorder
Author Natalie Efimoff Supervisor
Richard Cocks
FROG CALL SOUND RECORDER
The Topic Scientific analysis of frog calls can
help determine the frog populations in an area.
Declining frog populations can indicate
deterioration in air, soil, surface water and
rainfall water quality. The Frog Call Sound
Recorder is a digital sound recorder that can be
used by scientists to record frog calls in a
natural bush environment for a lengthy period of
time. The data can then be analysed by the
scientists. Sampling of sound waves Frog call
sound waves can range from 300Hz to 3000Hz.
These sound waves are sampled using a 24-bit
delta-sigma analog to digital converter at a
sample rate of 8000Hz. No automatic gain control
is used so that the entire 24 bits of data can be
stored at any time. It is then up to the
scientist which data is relevant to determining
the frog populations. Microcontroller The
Cypress Programmable System on Chip is a
microcontroller that provides dynamically
configurable analog and digital blocks. The PSOC
is used to create an operational amplifier, an
analog to digital converter, control the LCD and
interface with the data storage media using SPI.
PSOC
FROG CALL
MICROPHONE
MMC
USER
Data Storage Multimedia cards are used to store
sound data. MMCs range in sizes from 32MB to 1GB
and can interfaces with the PSOC using SPI. The
MMC is pre-formatted with FAT16 and all data is
stored as a .WAV file. The data can then be
played back on a computer after storage by using
a USB card reader. Because WAV files store the
raw data from the ADC this also allows scientists
the option to view the data in its raw format.