Morse code generator in sound

Question

Inspired by the Morse code question, and the Twinkle Twinkle little star question, write a program to accept a letter and generate the morse code audio for that letter.

Answer 1

Windows PowerShell, 200

Makes a dot 70 ms long. Accordingly, a dash is 210 ms and the gap between both is 70 ms as well.

[char[]](-split' ☺ ☺    ☺ ☺  ☺       ☺  ☺☺           ☺☺☺ ☺ ☺  ☺   ☺☺ ☺  ☺☺☺  ☺☺  ☺☺ ☺  ☺      ☺   ☺    ☺  ☺☺ ☺  ☺ ☺ ☺☺ ☺☺  ')[[char]"$input".ToUpper()-65]|%{[Console]::Beep(880,70+140*$_)
sleep -m 70}

Since this contains control characters, here's a hexdump:

000: 5B 63 68 61 72 5B 5D 5D │ 28 2D 73 70 6C 69 74 27  [char[]](-split'
010: 00 01 20 01 00 00 00 20 │ 01 00 01 00 20 01 00 00   ☺ ☺    ☺ ☺  ☺
020: 20 00 20 00 00 01 00 20 │ 01 01 00 20 00 00 00 00       ☺  ☺☺
030: 20 00 00 20 00 01 01 01 │ 20 01 00 01 20 00 01 00       ☺☺☺ ☺ ☺  ☺
040: 00 20 01 01 20 01 00 20 │ 01 01 01 20 00 01 01 00    ☺☺ ☺  ☺☺☺  ☺☺
050: 20 01 01 00 01 20 00 01 │ 00 20 00 00 00 20 01 20   ☺☺ ☺  ☺      ☺
060: 00 00 01 20 00 00 00 01 │ 20 00 01 01 20 01 00 00    ☺    ☺  ☺☺ ☺
070: 01 20 01 00 01 01 20 01 │ 01 00 00 27 29 5B 5B 63  ☺ ☺ ☺☺ ☺☺  ')[[c
080: 68 61 72 5D 22 24 69 6E │ 70 75 74 22 2E 54 6F 55  har]"$input".ToU
090: 70 70 65 72 28 29 2D 36 │ 35 5D 7C 25 7B 5B 43 6F  pper()-65]|%{[Co
0A0: 6E 73 6F 6C 65 5D 3A 3A │ 42 65 65 70 28 38 38 30  nsole]::Beep(880
0B0: 2C 37 30 2B 31 34 30 2A │ 24 5F 29 0A 73 6C 65 65  ,70+140*$_)◙slee
0C0: 70 20 2D 6D 20 37 30 7D │                          p -m 70}

I have tried several variants pf packing the data more tightly, but PowerShell is quite verbose in unpacking them again, so I don't gain much, sadly.

Answer 2

QBASIC (236 characters)

I count each newline as one character because QBasic seems to work fine without carriage returns, at least when running in DOSBox. Note that it only supports letters, not digits or punctuation.

INPUT Y$:C&=2^(26-ASC(Y$)MOD 32):A&=31313855AND C&:B&=60257815AND C&:M&=29932103:GOSUB S
IF A&OR B&THEN M&=34172681:GOSUB S
IF A&THEN M&=9538602:GOSUB S
IF A&AND B&THEN M&=66070:GOSUB S
END
S:SOUND 750,SGN(M&AND C&)*2+1:SOUND 0,1:RETURN

Answer 3

JScript .NET (174 characters)

A little-known programming language from Microsoft, it combines the (relative) terseness of JavaScript with the power of the .NET Common Language Runtime. Thanks minitech and Joey for Console.Beep.

This program accepts a single letter from standard input (A-Z or a-z only). It does not explicitly add intra-character pauses, but they do exist, at least on Windows 7.

morse.js

function S(a){K.Beep(750,!!(a&C)*99+50)}import System;var K=Console,C=1<<26-K.Read()%32,A=31313855&C,B=60257815&C;S(29932103);(A||B)&&S(34172681);A&&S(9538602);A&&B&&S(66070)

Compile with:

%SystemRoot%\Microsoft.NET\Framework\v4.0.30319\jsc morse.js

Explanation

Six 32-bit integers, of which 26 bits are used in each, serve as lookup tables. Each bit in a table corresponds to a letter of the alphabet, bit 25 used for A and bit 0 used for Z.

C = 1 << (26 - (K.Read() % 32)),

Because Morse code is a variable-length code that uses between 1 and 4 symbols for each letter, the tables 31313855 (bit 1) and 60257815 (bit 0) can together represent one less than the length of each letter's code.

A = 31313855 & C,
B = 60257815 & C;

The program uses additional lookup tables to store the dots and dashes for each letter. Using logic expressions of A and B, it stops once it has sent the correct number of symbols to the sound card.

S(29932103);
(A || B) && S(34172681);
A && S(9538602);
A && B && S(66070);

In each of the four lookup tables above, a zero represents a dot; a one represents a dash. !! (logical "not-not") is used to normalize false to 0 and true to 1 (to compensate for the differing locations of bits within the integer). The multiplication and addition of this value causes a dot to be a 50 ms, 750 Hz tone and a dash to be a (50 + 99) = 149 ms tone.

function S(a) {
  K.Beep(750, !!(a & C) * 99 + 50)
}

Answer 4

Sure.

VB.NET, 235 223 221 218 210 209 208 209 characters

With the appropriate structures, it is 245 characters.

Requires Option Strict to be Off for the latest one.

For Each c In"sl lsss lsls lss s ssls lls ssss ss slll lsl slss ll ls lll slls llsl sls sss l ssl sssl sll lssl lsll llss".Split()(Asc(UCase(Console.ReadKey.KeyChar))-65)
Console.Beep(1E3,200-(c="l")*400)
Next

Recent edits:

• Fixed the incorrect "b".
• Changed 999 to 1E3 so I can finally have that perfect thousand ;-)
• Used boolean->integer conversion to save 2 characters.