ATEVK1104S Atmel, ATEVK1104S Datasheet - Page 6

• Manufacturer Part Number: ATEVK1104S
• Description: KIT EVAL FOR AT32UC
• Manufacturer: Atmel
• Series: AVR®32 UC3r
• Type: MCUr

Specifications of ATEVK1104S

• Contents: Board, Cables
• Tool Type: Development Kit
• Cpu Core: AVR 32
• Data Bus Width: 32 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3A3256S
• Interface Type: USB, JTAG, SD Card, Nexus, MMC
• Core Architecture: AVR
• Operating Supply Voltage: 5.5 V
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.4 Signal generation
3.5 Basic Filtering
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AVR32908
Zooming:
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Reset application:
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To provide a complex input signal to the DSP filters, the application generates two
sine signals using the dsp16_gen_sin() function found in the Signal Generation
category of the DSP library.
This function fills a vector (buffer) with a sinusoidal signal of a specified frequency
and sampling rate. This function is used to change the input frequency of our source
signals.
Generating different input signals:
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A basic filter function is a function that suppresses (reduces) selected frequencies in
a signal. Filters are applied to extract useful information from a signal, either by
removing unwanted signals (noise) or extracting useful frequencies that lie within a
given frequency range. In audio applications, filters are applied to split the audio
signal into bass and treble channels. In RF communication, filters are used to remove
the carrier frequency.
A wide range of filters exist, but they are usually categorized into 4 categories:
Select the combined input signal at the middle of the screen.
Press and hold the FUNC3 button to zoom on the graph.
Press and hold the BACK button for 3 seconds (or push the RESET button) to
reset the source signals and filters and return the application to its initial state.
Push and hold the BACK button for 3 seconds to reset the signals and filters.
Turn the wheel to select Source 1.
Push FUNC 2 to select frequency setting.
Turn the wheel and observe how the frequency of the source signal can be
modified.
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Low pass filters allow frequencies below the cutoff frequency to pass
through, and suppresses frequencies above it.
High pass filters allow frequencies above the cutoff frequency to pass
through.
Band pass filters combine a low pass filter and a high pass filter to allow
only frequencies in a limited frequency band (range) to pass through.
Advanced filters make use of advanced signal processing theory to extract
useful information spread across multiple frequencies.
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