changed default sample rate to 48kHz, updated README for new usage information

README.md

@@ -18,20 +18,15 @@ With the Rust compiler installed under a Unix-like OS, you can compile this sour
 
 ###How to Use
 Interval can be run at the command line with the following syntax:
-`./interval [input file]`
-This will produce a WAV RIFF header followed by a PCM audio stream to stdout, which can then be piped into a file, audio
-device, or other audio stream acceptor. If you don't pipe it into anything and it dumps the stream out onto the console,
-then it will probably flood your screen with garbage text, so be warned.
+`./interval [input file] [output file]`
+This will attempt to read Interval code from the input file, generate audio based on it, and emit the resulting data,
+prefixed with a suitable RIFF header, into the output file (which will be in `.wav` format). The audio stream is signed
+16-bit little endian samples, at a sample rate defined by a static variable in the source code (48 kHz by default).
 
 ###Example Usage
 Under Linux with ALSA, you can compile and play a .ITV source file with a command like this:
-`./interval test.itv | aplay`
-
-###Writing to Files
-You can pipe the output of the program into a file:
-`./interval test.itv > test.wav`
-This file will be in standard WAV format, and can be converted to other formats with a conversion tool such as 
-avconv or ffmpeg.
+`./interval test.itv`
+This will write WAV data into `test.wav`, creating it if it does not exist and overwriting it if it does.
 
 
 

interval.rs

@@ -159,7 +159,7 @@ Tricks:
 
 */
 
-static RATE:f64 = 44100.0; // audio sample rate in samples/sec
+static RATE:f64 = 48000.0; // audio sample rate in samples/sec
 static TAUS:f64 = 5.0; // number of time contants to allow for notes to finish ringing before ending the output stream
 
 use std::io::prelude::*;