Handheld Audio Spectrum Analyzer (HASA)
Details
| Size: | 513 KB |
| Last Update: | 2007-07-16 17:12:33 |
| Version: | 2.2 |
| OS Support: | Windows Mobile for Pocket PC |
| License/Program Type: | Shareware |
| Publisher: | Bofinit Corporation |
| Price: | $14.99 |
Description:
Version 2.2 with 44kHz sampling rate!
HASA is a handheld audio frequency spectrum analyzer for the Pocket
PC 2003 and 2002 devices. Frequency components of sounds picked up
by the built-in microphone are shown and analyzed in real-time. The
frequency decomposition can be shown as a standard plot of dB vs.
Hz or as a "cascade" plot, showing its time evolution. The standard
plot can be shown as a line or ISO bar chart. For checking
purposes, an artificial White Noise signal can be applied to the
Fourier Transform (yielding a flat frequency response). The user
may choose to average the frequency response data over an extended
period of time, and exclude a region of the measured time data in
order to remove any observed transient anomalies that may appear.
Clipping at the microphone is indicated on the HASA display, as are
the real-time measured samples and their frequency spectrum.
The measured spectrum can be A-Weighted, and can be stored as a
file in the PocketPC. Stored spectra can be loaded at run time, and
subtracted from the current spectra in order to correct the data. A
built-in oscillator generates pure tones across the full audio
spectrum, or can generate White Noise for frequency response
measurements etc.. Another included feature is note
detection, where the equivalent piano note on the
equal-tempered scale is detected from the measured spectrum. This
in principle allows a quick determination of whether a musical
instrument is badly off tune or not...
A full installation and user guide is included.
Possible Applications:
Measuring sound levels in a car, plane, room, rock concert
etc..
Measuring the frequency response of audio equipment, e.g.
loudspeakers
Measuring frequencies and levels of noise from equipment.
Measuring fidelity of home or car audio systems (e.g. using the
built-in White noise generator, or a test CD).
Measuring frequency of an opera singer's top A!
HASA supports Pocket PC (MIPS & SH3) as well as Pocket PC
2002 (ARM) devices, including the new XScale CPUs
Here follows a list of updates to HASA since the initial version
was released:
Version 1.1 handles Audio interrupts more reliably, and adds
automatic time domain plot scaling.
Version 1.2 offers a new feature of a musical note identifier
(equal tempered scale). This feature shows the frequency of the
loudest detected sound as the corresponding note on the piano
scale.
Version 1.3 features improved stop/start stability, and a
simple pure tone oscillator that is activated by tap/hold on the
frequency plot.
Version 1.4 includes a new feature that allows the optional
display of the absolute deciBel (dB) sound level.
Version 1.5 increases the number of audio record buffers, so
avoiding starvation of the audio system. This improves the fidelity
of the spectrum especially on iPAQ devices. Also, improved graphics
handling in this version has reduced display flicker.
Version 1.6 optionally shows the peak FFT values as a decaying
plot superimposed on the latest FFT. This feature is useful for
observing the envelope of the peak frequency response over the last
few seconds.
Version 2.0 new features include Save/Load of frequency
spectra, subtraction of loaded spectrum, A-weighting in 8 octave
bands, a logarithmic sum giving the overall noise level, and a
White Noise generator.
Version 2.1 adds pulse-mode frequency response analysis, and
ISO-centred bad graph display.
Version 2.2 allows the dB scale limits to be set, and increases
the sampling rate on the PocketPC 2002 devices to 44kHz. This
allows audio frequencies up to 22kHz to be measured. There are also
some code optimizations which improve performance, particularly for
the iPAQ devices.
Note: some Pocket PC devices are not capable of full duplex audio
(e.g. Casio EM500). All known current Pocket PC 2002 and Pocket
2003 devices are capable of full duplex.
System Requirements:
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