App Shopper: MorseDecoder (Utilities)

App Activity

Oct 22 '11	Version 1.8.3
Sep 28 '11	Version 1.8.0
Jun 03 '11	Version 1.7.0
Apr 12 '11	Version 1.6.2
Feb 23 '11	Version 1.6.0
Jul 21 '10	Version 1.4.0
Jan 12 '10	$7.99 -> $9.99
Nov 30 '09	$4.99 -> $7.99
Aug 05 '09	Version 1.1.1
May 03 '09	$3.99 -> $4.99
Apr 25 '09	New App: $3.99, v1.0.0

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MorseDecoder

iOS Universal

Translate CW or Morse Code audio into text.

The HotPaw Morse Code Decoder takes audio input from the microphone or headset input on your iPhone or iPad, decodes Morse Code and displays the results in text form.

The decoder includes a built-in audio spectrum analyzer to help you find the frequency of any Morse Code tones present. There is 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 1400 Hz. The filter can also be left off in a wide-band mode (frequency lock icon unlocked). An additional 2 kHz low-pass pre-filter helps eliminate QRM. On the iPhone version, tap the lock icons to toggle filter and WPM modes, and tap the frequency lock to set the audio filter to the current peak signal.

The Morse code WPM (words per minute) detection speed is automatically adaptive from about 8 to 40 WPM, and can be locked to the current estimated WPM dot speed (WPM lock icon locked). A High Speed WPM Mode more suitable for QRQ code speeds in the range of 30 to 80 WPM is also available. This mode also supports higher frequency dot-dash tones.

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

Only about the last 250 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.

On a 2nd generation iPod Touch, this application requires the use of an external microphone. On a 1st generation iPhone, this application requires the use of an external microphone in order to get sufficient audio bandwidth and sample rate. 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.