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SPEEDY Analog Input Gain Settings

Primary Software: LabVIEW Modules>>DSP Module
Primary Software Version: 1.0
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem: In addition to jumpers JP1 and JP2 on the SPEEDY device, there is a "gain" setting on the configuration dialogue for the DSP Analog Input Elemental I/O Node. How does input gain on the SPEEDY actually work?

Solution: The only way to adjust input gain on the SPEEDY is through the use of jumpers JP1 and JP2. While there is a "gain" setting on the Analog Input I/O Node, the number entered there is only used in a software multiplication after the analog to digital conversion has already taken place. Below is some information from section 4.1 of the SPEEDY user manual regarding analog input gain:

"The Audio Input Level Setting controls the amount of gain applied to the input audio
signals; ‘Microphone Level’ setting has the highest gain, while ‘Line Level’ has less gain
and is more appropriate for line level audio interface (i.e., CD Player, MP3 player, etc.).
These settings will affect the gain of the on-board microphones (X1, X2) and should be left
in the ‘Microphone Level’ setting if no external microphone or audio source is used at
Audio Stereo Input Port/Jack P3.

Important Note: it is important to ensure that line level audio signals are not
connected to the audio input when SPEEDY-33 is configured for ‘Microphone Level’
as it may be possible to damage the audio input circuitry by over driving the input."

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Report Date: 04/28/2005
Last Updated: 05/18/2005
Document ID: 3KR8MNSF

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