2.7.18 expWAV

1 Menu Information
2 Brief Information
3 Command Line Usage
4 X-Function Execution Options
5 Variables
6 Description
7 Examples
8 Related X-Functions

Menu Information

File: Export: Sound (WAV)

Brief Information

Export data as Microsoft PCM wave file

Command Line Usage

expWAV fname:="sound.wav";

X-Function Execution Options

Please refer to the page for additional option switches when accessing the x-function from script

Variables

Display Name	Variable Name	I/O and Type	Default Value	Description
Channel Mode	mode	Input int	mono	This variable specifies the channel mode. Option list mono:Mono Mono channel stereo:Stereo Stereo channel
Input Worksheet	iw	Input Worksheet	<active>	Specify the input range to be converted to WAV
Left Channel	left	Input int	1	Specify which column of the worksheet is the left channel. And it will represent the Channel when Channel Mode selected as moto.
Right Channel	right	Input int	2	Specify which column of the worksheet is the Right channel. It is only avaliable when Channel Mode selected as Stereo
Start Row	r1	Input int	1	The begin of the data to be exported
End Row	r2	Input int	0	The end of the data to be exported
File Name	fname	Input string	fname$	Specify the path and filename of the output WAV file
Sample Bits	bits	Input int	bit16	Specify the Sample Bits of the output WAV file Option list 8 Bits 8 Bits 16 Bits 16 Bits 32 Bits 32 Bits

Description

The expWAV function exports worksheet data as Microsoft PCM wave file. It can be accessed from menu or command window

Menu: Select Data: Import from File: Multiple ASCII...

Command window: expWAV -d

Noted that the value of the Sampling Interval in the worksheet must be larger than 22Hz.

Examples

Code Sample

/*
This script shows how to import a sound wave file and do some processing then export the result. 
The sample data is located in exe_path\Samples\Signal Processing\.
1. Import a wav file to a new book.
2. Perform low-pass filters on the data to remove the high frequency part of the sound.
3. Export the data to a new wav file.
*/
// Import the wav file
fname$ = system.path.program$ + "Samples\Signal Processing\sample.wav";
newbook s:=0;
newsheet col:=1;
impWav options.SparkLines:=0;
string bkn$=%H;
// Remove the high frequency part
fft_filters [bkn$]1!col(1) cutoff:=2000 oy:=(<input>,<new name:="Low Frequency of the Sound">);
// Set the new wav column's format to be short(2) type
wks.col2.format=1;
wks.col2.numerictype=3;

// Export to a new wav file;
fname$="";
expWav iw:=[bkn$]1 left:=2;