![]() * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * included in all copies or substantial portions of the Software. * The above copyright notice and this permission notice shall be * and to permit persons to whom the Software is furnished to do so, * publish, distribute, sublicense, and/or sell copies of the Software, * including without limitation the rights to use, copy, modify, merge, * (the "Software"), to deal in the Software without restriction, * a copy of this software and associated documentation files * Permission is hereby granted, free of charge, to any person obtaining * Copyright (c) 1999-2000 Ross Bencina and Phil Burk * This program uses the PortAudio Portable Audio Library. Printf("\nMorse sound in progress.\n") įor (j = 0 alphamorse) - 65] != '\0' j++) // Counting the numbers of dash/dots in the wordĬode: /** Record input into an array Save array to a file Playback recorded Phil Burk Printf("%s ", alphamorse) - 65]) // Print the a-z string If (T != ' ' & (!isdigit(T))) // if user input isnt space or number While (T != '\0') // Convert the string to morse (the end of the string '\0') Printf("\nMorse convert in progress.\n") // UI Printf("\nYour input:\n") // UI -> string show Gets(T) // To recive input from user keyboard Printf("\nEnter a sentence:\n") // UI -> string Scanf_s("%d", &delaydd) // To recive input from user keyboard Printf("\n Delay between Dash/Dot duration : \n") // UI -> delay duration (Default 0msec) Scanf_s("%d", &dot) // To recive input from user keyboard Printf("\n Dot ('.') duration : \n") // UI -> dash duration (Default 100msec) Scanf_s("%d", &dash) // To recive input from user keyboard Printf("\n Dash ('-') duration : \n") // UI -> dash duration (Default 300msec) Gets(enter) //recive the 'Enter' pressing from user without interruption for the gets below Scanf_s("%d", &freq) // To recive input from user keyboard } while (input > 4 || input frequancy (Default -> unsigned int freq=550) Scanf_s("%d", &input) // scan -> user input Printf("\nUltrasonic Data Transmit & Receive - POC\n \nChoose one of the following options by entering the number:\n" "\n1.Transmit\n" "2.Receive\n" "3.Configuration\n" "4.Exit\n") //UI main menu Input = 0 count = 0 i = 0, j = 0 // reset the Setting & Variables values Unsigned int input = 0 //defult value of menu input Unsigned int delaydd = 0 // delay between dash/dots Unsigned int freq=550,dash=300,dot=100 // Recommended -> dash time x3 then dot -Setting & Variables-//Ĭhar enter // To recive enter input without interruption #include "delay.h" // To call delay.h function #include // To use more standard functions #include // To use standard input/output functions ![]() #include // To use output of the computer (speakers) ![]() ![]() With a bit of manual tweaking the clear decoded message is displayed and can be entered as a flag.Code: #define _CRT_SECURE_NO_WARNINGS // To ingore VisualStudio C language errors Trying to decode the morse code by hand was too slow and tedious and was errorprone due to lack of training: We export the 'clean' sound file as ```reage_morse.wav```. When playing the audio we hear a distinct rythmic beeping in the background.Ī quick frequency analysis with ( (audio_editor)) shows us, that the beeping noise centers around the 500Hz range on the Frequency spectrum:Īfter applying a frequency filter, which blocks everything except the 500Hz signals the morse code becomes the dominant element in the sound file. Flag is the STRING you end up with after solving challenge, case insensitive.
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