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03.28.2007 at 11:23AM PDT, ID: 22478358
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8.2

Can't record 8K 16Bit Mono wav file using mciSendString

Asked by mdcarr in Audio Editing, Visual Basic Programming, General Multi-Media Software

Tags: , ,

Hello,

First thank you for your time.  My goal is to record a wav file with properties 8KHz 16Bit Mono.  I've included a code snippet that demonstrates my problem.  The first thing to notice is that even though 8000hz was specified the samples per second that is being recorded is 11025 as show in the debug.print statement.  What is the reason 11025 is returned when 8000 was specified?  More importantly, please modify the code to make it work.

Thank you very much,
Michael  


Private Declare Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal CommandString As String, ByVal ReturnBuffer As String, ByVal ReturnBufferSize As Long, ByVal hCallback As Long) As Long 'MCIERROR

Private Sub cmdStartRecording8K16BitMonoWav_Click()
    Dim i As Integer
    Dim sMsg As String * 255
    Dim sSamplesPerSec As String
   
    i = mciSendString("open new Type waveaudio Alias voice3", 0&, 0, 0)
    i = mciSendString("stop voice3", 0&, 0, 0)
   
    i = mciSendString("set voice3 bitspersample 16", 0&, 0, 0)
    i = mciSendString("set voice3 channels 1", 0&, 0, 0)
    i = mciSendString("set voice3 samplespersec 8000", 0&, 0, 0)
    i = mciSendString("record voice3 ", 0&, 0, 0)

    i = mciSendString("status voice3 samplespersec", sMsg, 255, 0)
    sSamplesPerSec = Left(sMsg, InStr(sMsg, Chr(0)) - 1)
    Debug.Print sSamplesPerSec
End Sub

Private Sub cmdStopRecording_Click()
    Dim i As Integer
    Dim sMsg As String * 255
   
    i = mciSendString("stop voice3", 0&, 0, 0)
    i = mciSendString("save voice3 d:\temp\test3.wav", 0&, 0, 0)
    i = mciSendString("close all ", 0&, 0, 0)
End Sub
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[+][-]04.09.2007 at 01:33PM PDT, ID: 18878477

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[+][-]04.10.2007 at 09:43AM PDT, ID: 18883646

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[+][-]04.11.2007 at 04:00PM PDT, ID: 18894300

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About this solution

Zones: Audio Editing, Visual Basic Programming, General Multi-Media Software
Tags: mcisendstring, wav, record
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Solution Provided By: DanRollins
Participating Experts: 1
Solution Grade: A
 
 
[+][-]04.11.2007 at 06:43PM PDT, ID: 18895110

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