RST Decoder3.5.0

This is an App that decodes Morse code input from the microphone.
It is a Morse practice App that you can use to check if you are keying the correct code.
Signals with good S/N can be decoded correctly, but signals with bad S/N cannot be decoded correctly.
Also, the performance will be degraded for extremely slow or fast signals.
Usually about 5 to 10 characters are required for speed synchronization of Morse Code.
Adjust the input signal so that the peak value changes from level 6 to level 7.
Make fine adjustments to each parameter according to the reception status.

[Additional Functions]
-In addition to the decoder using BPF, a new decoder using FFT has been added so that it can be switched according to the usage.
-AFD (Auto Frequency Detector) function has been added to the decoder using BPF, and BPF can be set automatically by pressing the AFD button.
-The decoder using FFT automatically follows the strongest signal in the band by AFD (Auto Frequency Detector) and AGC (Auto Gain Control). You can also hold the AFD / AGC parameters by pressing the Lock button.
* There will be a time lag of about 1 to 2 seconds for AFD tracking.

[Control parameters]
1. Audio Input Level
2.BPF ON/OFF
3.BPF of Center Frequency
4.BPF of Band Width
5.CW Speed Control ON/OFF
6.CW Speed Control Low, Mid1, Mid2 or High
7.Delete All Decoded Text
8.Realtime CW Signal Display
9.Input signal recording / playback function
*Japanese/KANA text is not supported.

[Note]
Since the signal after BPF is output to the audio output, it can also be used as an AF-CW filter.

[URL of this App working example video]
https://youtu.be/Pwp7W4m-m34

Version History Updated the Morse Decoder Login in old UI. 3.5.0 Aug 30 Update the Morse Decoder Logic in SwiftUI. 3.4.0 Aug 29 You can call a decoder that implements the new algorithm. 3.3.0 Jan 23 The display method has been upgraded. 3.2.0 12/22/2025 Added a recovery function so that the app can start even in environments without network connection. 
However, in that case startup will be delayed by 10 seconds. 3.1.0 12/08/2023 Updated Admob SDK. 3.0.0 05/02/2023 I reviewed the parameter of the decoder part and improved the performance. 2.8.0 02/16/2023 Fixed a screen scaling bug on iPhone mini. 2.7.0 02/10/2023 Adjusted the screen size. 2.6.0 02/05/2023 Updated info.plist file. 2.5.0 12/07/2022 Changed the space character insertion logic 2.4.0 11/14/2021 -In addition to the decoder using BPF, a new decoder using FFT has been added so that it can be switched according to the usage.
-AFD (Auto Frequency Detector) function has been added to the decoder using BPF, and BPF can be set automatically by pressing the AFD button.
-The decoder using FFT automatically follows the strongest signal in the band by AFD (Auto Frequency Detector) and AGC (Auto Gain Control). You can also hold the AFD / AGC parameters by pressing the Lock button. 2.3.0 11/04/2021 Supported landscape mode. 2.2.0 10/24/2021 Supports input signal recording / playback function.
Fine-tuned the parameter of CW SPD/Auto mode. 2.1.1 06/12/2021 Fine-tuned the parameter of CW SPD/Auto mode. 2.0.0 05/16/2021 Updated the google Admob library. 1.9.0 02/23/2021 Added a real-time monitor display function for Morse code level.
The GUI has been changed due to the addition of functions. 1.8.0 01/01/2021 Changed the display sequence of interstitial ads. 1.6.0 11/07/2020 Ad implementation fix 1.5.0 10/29/2020 App Privacy Policy update. 1.4.1 08/30/2020 Changed the volume level for interstitial ad. 1.4.0 08/03/2020 Bugfixed.
Added the Interstitial ads. 1.3.0 08/01/2020 Fixed bug in the decoded text display area. 1.2.0 07/14/2020 Prevent the auto sleep process.
Detection support [AR] [BT] [VA] [AR] [SN] 1.1.0 06/26/2020 1.0.0 06/21/2020