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Visual
Sound Instrument (Version 1.1)
.....................Screen
Shot Download
Instruction
Visual Sound Instrument is a PC
instrument that use sound card to record and play audio signal. Its functions
include power spectrum, amplitude spectrum and 1/1 and 1/3 octave spectrum.
It is a low-cost sound analyzer for non-professional testing.
For example, Hi-Fi users can use
it to analyze the response curves of speakers at home in order to optimize
their location
and/or equalization.
Installation
a). System
Requirement
· 16 MB RAM
· 16 bit Sound card
· Windows95/98,
b).Unzip
VSI
Bulid a new path on you harddisk,
such as c:\vsi, then unzip vsi.zip into it. You can see these files in
it.
vsi.exe
-- Visual Sound Instrument program
vsi.htm
-- Help File and user's book of Visual Sound Instrument
then installation is finished.
c).Running
VSI
1. Start VSI. If you see a picture
like above that you have installed VSI successfully.
2. Check Record ability. Press record
button and acquire a signal from MIC. If waveform change when you speaking,
that is OK.
3. Check Play ability. Press play
button to play a sound from speaker. If you can hear a sound from speaker,
that is also OK.
If these steps are passed, you can
use VSI to do sound measure and analyze.
Mono/Stero
This is used to set recording mode,
click BNC to set mono or stero recording mode.
Weighting
This is used to set frequency weighting
network. Linear A, B and C weighting curves can be used in analyze. Click
button to set.
Window
This is used to set spectrum
window type. Rectangle, Hanning, Hamming and Flat window are supplied.
Click button to set.
Analysis
This is used to select analyze method.
Waveform, power spectrum, amplitude-phase spectrum, real-imaginary spectrum,
1/1 octave spectrum, 1/3 octave spectrum and amplitude spectrum/waveform
are supplied. Click button to set.
Show
This is used to zoom in and zoom
out curve in Y direction. Click button to set.
Sample Frequency
Thsi is used to set recording frequency.
11KHz, 22KHz and 44KHz are available. Click button to set.
Average
This is used to turn on/off signal
average function. Average function add each cure together and show a average
curve. This is very useful when you want to get a frequency response curve.
Click button to set.
Channel
This is used to select display channel.
Click button to set.
Linear/Log
This is used to set display mode
of spectrum or octave spectrum. Click button to set.
ToolBar
.
1.Inner signal
generator.
2.Recording
from MIC.
3.Playing
from speaker
4.Stop signal
generator/MIC/speaker.
5.Open a WAV
file to analyze, or open a calibation file.
5.The
calibation file is a text file, you can edit it by any text program,such
as notepad.
6.Save signal
to a WAV file or save the current calibation value to a text file.
7.Copy screen
shot to clipboard(BMP)
8.Copy curve
to clipboard(TEXT)
9.Help File
10.Home of
VSI
MouseMove
You can show
curve value by move mouse to where you want to see.
RightClick
Click right
mouse button to copy a screen shot to clipboard and Double click it to
copy curve data to clipboard.
DDE&NETDDE
Server
VSI is a DDE
server that is mean you can control it by a DDE client program that is
run on same computer.
Server
Name=VSI,
Topic=System
| DDE Order |
Function |
| DAT |
Copy curve data to clipboard |
| BMP |
Copy screen shot to clipboard |
| WEIn (n=0,1,2,3) |
Set frequency weight network |
| WINn (n=0,1,2,3) |
Set spectrum window |
| ANAn (n=0,1,2,3,4,5,6) |
Set analysis method |
| AMPn (n=0,1) |
Zoom Out / Zoom IN |
| FREn (n=0,1,2) |
Set sample frequency |
| STEn
(n=0,1) |
Mono / Stero set |
| AVEn (n=0,1) |
Average on / off |
| CHAn (n=0,1) |
Set display channel |
| LINn
(n=0,1) |
Set linear / log display mode |
| GENn (n=0,1,2,3,4) |
Set inner signal source |
| REC |
Recording from sound card |
| STO |
Stop real time analysis |
Below is a DDE
client program of FoxPro:
clear
ichan=DDEInitiate("VSI","System")
&& connect to VSI
IF ichan=-1
? "VSI
is not running."
RETURN
ENDIF
=DDEExecute(ichan,'FRE0')
&& Fs=11025
=DDEExecute(ichan,'STE0')
&& Mono record
=DDEExecute(ichan,'REC')
&& Record from MIC
=DDEExecute(ichan,'CHA1')
&& Display channel 1
=DDEExecute(ichan,'ANA5')
&& 1/3 octave spectrum
=DDEExecute(ichan,'WEI1')
&& A weighting networking
=DDEExecute(ichan,'WIN0')
&& Rectangle window
=DDEExecute(ichan,'LIN1')
&& Log Display mode
=DDEExecute(ichan,'AVE0')
&& Open Average switch
=DDETerminate(ichan)
&& Disconnect from VSI
=INKEY(5)
&& Wait for 5 second
ichan=DDEInitiate("VSI","System")
&& connect to VSI again
=DDEExecute(ichan,'STO')
&& Stop recording
=DDEExecute(ichan,'DAT')
&& Copy analysis data to clipboard
=DDETerminate(ichan)
&& Disconnect from VSI
getdat=_CLIPTEXT
&& Get analysize result
? getdat
&& Show data
.
VSI is also
a NETDDE server that is mean you can control it by a NETDDE client program
that is run on another computer.IP Addres = IP of VSI Running,
Prot=8888
| UDP Order |
Function |
| DAT |
Copy curve data to clipboard |
| BMP |
Copy screen shot to clipboard |
| WEIn (n=0,1,2,3) |
Set frequency weight network |
| WINn (n=0,1,2,3) |
Set spectrum window |
| ANAn (n=0,1,2,3,4,5,6) |
Set analysis method |
| AMPn (n=0,1) |
Zoom Out / Zoom IN |
| FREn (n=0,1,2) |
Set sample frequency |
| STEn
(n=0,1) |
Mono / Stero set |
| AVEn (n=0,1) |
Average on / off |
| CHAn (n=0,1) |
Set display channel |
| LINn
(n=0,1) |
Set linear / log display mode |
| GENn (n=0,1,2,3,4) |
Set inner signal source |
| REC |
Recording from sound card |
| STO |
Stop real time analysis |
NETDDE is realized by UDP. When Send
a UDP order to VSI via NET, it return a 4KB float array. If you are not
familiar with UDP programming, I supply a UDP client program(udpclient.exe)
with this package, you can use it to do this.
Its usage is: udpclient.exe
IP Order
For non "DAT" order, the return
message is "OK", or "Time Out". For "DAT" order, the return message
is curve data. Below is a NETDDE client program of FoxPro.
Clear
RUN "c:\test\udpclient.exe
127.0.0.1 FRE1" && Connect to VSI on 127.0.0.1 and
set Fs=22050
? _CLIPTEXT
&& OK=success, Time Out=fail
RUN "c:\test\udpclient.exe
127.0.0.1 ANA5" && Connect to VSI on 127.0.0.1 and set 1/3 octave
? _CLIPTEXT
&& OK=success, Time Out=fail
=INKEY(5)
&& Wait for 5 seconds
RUN "c:\test\udpclient.exe
127.0.0.1 DAT" && Connect to VSI on 127.0.0.1
and get 1/3 octave data
? _CLIPTEXT
&& Show data on clipboard |
.
Technical
Support
To request technical support send
your inquiry to heliso@public.wuhan.cngb.com.
Include the following information:
.
Your Name
E-mail
address
Operating
system
The version
of VSI you are using
Computer
hardware
1999.1.30
