HotPaw Morse Code Decoder Readme

HotPaw Morse Code Decoder uses the built-in microphone on your iPhone
3G to listen for audible Morse Code tones.  It attempts to decode and
display the results in text form.

The Morse Code Decoder includes a built-in spectrogram to detect the
audio frequency of the Morse Code tones, and an optional narrow band
audio filter to help filter out background noise.  If the audio filter
is enabled (frequency lock icon locked), the filter can be set for
frequencies in the range of 400 to 1200 Hz.  The filter can also be
left off in a wide-band mode (frequency lock icon unlocked).  Tap the
spectrogram to set the audio filter to the frequency of the current
peak signal.  Tap the lock icons to toggle filter and WPM modes.

The Morse code WPM (words per minute) detection speed is automatically
adaptive from about 8 to 30 WPM, and can be locked to the current
estimated WPM dot speed (WPM lock icon locked).

It may take several initial characters containing both dots and dashes
before the WPM speed estimation starts to get close to the actual WPM.
The AGC is automatic, but background sounds and signal fading can
interfere with detection and decoding.  The quality of detection depends
on the signal level, signal to noise ratio, stability of the frequency
and WPM speed, and keying "fist" quality.

Only about the last 100 decoded characters are displayed in this version.
The characters that can be decoded include International Morse Code
for the 26 letters A-Z, the numerals 0-9, period, comma, forward slash,
and question mark.

This application requires the use of an external microphone on a 1st
generation iPhone in order to get sufficient audio bandwidth and sample
rates.  This application requires the use of an external microphone
on a 2nd generation iPod Touch.  It will not work on a 1st generation
iPod Touch.

HotPaw productions has several other companion applications in the iTunes
App store.  Look for HotPaw MorseTest to learn and practice Morse Code.


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SUBJECT TO ANY STATUTORY WARRANTIES WHICH CAN NOT BE EXCLUDED, HOTPAW
PRODUCTIONS MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING WITHOUT LIMITATION, THE WARRANTY OF NON-INFRINGEMENT AND
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE, REGARDING THE PROGRAM OR TECHNICAL SUPPORT, IF ANY.

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Version 1.1.1 - OS 3.0 compatibility enhancements
Version 1.0.0 - initial release

Copyright 2009 HotPaw Productions ALL RIGHTS RESERVED
http://www.hotpaw.com/rhn/hotpaw/
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