MaxSoundPressureLevel
Sound pressure level for microphone channels
Description
When working with the session-based interface, use the MaxSoundPressureLevel
set
the maximum sound pressure of the microphone channel in decibels.
Values
The maximum sound pressure level is based on the sensitivity
and the voltage range of your device. When you sent your device Sensitivity
, the MaxSoundPressureLevel
value
is automatically corrected to match the specified sensitivity value
and the device voltage range. You can also specify any acceptable
pressure level in decibels. Refer to your microphone specifications
for more information.
Example
Change Maximum Sound Pressure of Microphone
Change the Sensitivity of a microphone channel and set the maximum sound pressure level to 10.
Create a session and add a microphone channel.
s = daq.createSession('ni'); ch = addAnalogInputChannel(s,'cDAQ1Mod3', 0, 'Microphone')
ch = Data acquisition analog input microphone channel 'ai0' on device 'cDAQ1Mod3': Sensitivity: 'Unknown' MaxSoundPressureLevel: 'Unknown' ExcitationCurrent: 0.002 ExcitationSource: Internal Coupling: AC TerminalConfig: PseudoDifferential Range: -5.0 to +5.0 Volts Name: '' ID: 'ai0' Device: [1x1 daq.ni.CompactDAQModule] MeasurementType: 'Microphone' ADCTimingMode: ''
Set the channel’s sensitivity to 3 0.037
.
ch.Sensitivity = 0.037
ch = Data acquisition analog input microphone channel 'ai0' on device 'cDAQ1Mod3': Sensitivity: 0.037 MaxSoundPressureLevel: 136 ExcitationCurrent: 0.002 ExcitationSource: Internal Coupling: AC TerminalConfig: PseudoDifferential Range: -135 to +135 Pascals Name: '' ID: 'ai0' Device: [1x1 daq.ni.CompactDAQModule] MeasurementType: 'Microphone' ADCTimingMode: ''
Set the channel maximum sound pressure to 10 dB.
ch.MaxSoundPressureLevel = 10
ch = Data acquisition analog input microphone channel 'ai0' on device 'cDAQ1Mod3': Sensitivity: 0.037 MaxSoundPressureLevel: 10 ExcitationCurrent: 0.002 ExcitationSource: Internal Coupling: AC TerminalConfig: PseudoDifferential Range: -135 to +135 Pascals Name: '' ID: 'ai0' Device: [1x1 daq.ni.CompactDAQModule] MeasurementType: 'Microphone' ADCTimingMode: ''