Note that some extra 0’s may naturally occur at the beginning and the end of a message, make sure to ignore them. , dashes - and spaces (one between characters, three between words) and return those as a string. That said, your task is to implement two functions:įunction decodeBits(bits), that should find out the transmission rate of the message, correctly decode the message to dots. After the message is fully received, it gets to you for decoding as a string containing only symbols 0 and 1.įor example, the message HEY JUDE, that is
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An amateur person may need a few seconds to transmit a single character, a skilled professional can transmit 60 words per minute, and robotic transmitters may go way faster.įor this kata we assume the message receiving is performed automatically by the hardware that checks the line periodically, and if the line is connected (the key at the remote station is down), 1 is recorded, and if the line is not connected (remote key is up), 0 is recorded. And in fact different operators would transmit at different speed. However, the standard does not specify how long that “time unit” is. Pause between words – is 7 time units long. Pause between characters inside a word – is 3 time units long. Pause between dots and dashes in a character – is 1 time unit long. When transmitting the Morse code, the international standard specifies that:
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The Morse code encodes every character being transmitted as a sequence of “dots” (short presses on the key) and “dashes” (long presses on the key). You will be able to experience the best results at night or with low ambient light.In this kata you have to write a Morse code decoder for wired electrical telegraph.Įlectric telegraph is operated on a 2-wire line with a key that, when pressed, connects the wires together, which can be detected on a remote station. If your device's frame rate is too slow, decoding will most certainly be impossible since at least 7 fps are required for the lowest available transmission frequency in the app.Īs the blinking light gets farther away from the phone, the decoding process gets inaccurate. Cyrillic (Russian, Serbian, Bulgarian, Ukrainian, etc) Latin alphabets (English, Spanish, Italian, Portuguese, etc.) Supported languages for transmission, decoding and translation: Supported languages (not for transmitting) Choose any of the available camera resolutions in your device. Set Day/Night mode for decoder sensibility to light. Increase sensibility to light when decoding (useful when light source is far). Includes a Morse Code International Telecommunication Union (ITU) alphabet for reference. Translate from text to Morse and vice versaĪllows translation from plain text into Morse code and translation from Morse Code to text. That is, using either the flash or the speakers. Transmit Morse code using camera flash and speaker (beeps)įor an entered message, the user can select whether to transmit the morse signal in the form of light or sound. This new setting will be saved for as long as you stay in the app. If the light blinks at a frequency that is too fast or too slow (using the default transmission settings as a comparison) expect to lose the first 2 characters, but after that, the decoding algorithm will adapt itself to the new frequency and you will lose NO more characters. Simply point the camera to the blinking light and make sure the light stays in the redĬircle.