Make use of Sound Credit card as an Oscilloscope
and Function Generator
LUMS School of Science and Engineering
Winter months 2010
MATLAB. DAQ. Sound cards. Oscilloscope. Transmission Generator.
Audio card within personal computers facilitates the input and output of audio signs, under the control of a driving a car software electronic. g. in multimedia. This device can be used while an oscilloscope for signals up to a rate of recurrence of twenty kHz.
The next text displays how sound card work extremely well as a great oscilloscope and since a signal electrical generator using the Data Acquisition Toll box provided by MATLAB. Data Acquisition tool box needs to be mounted for this purpose.
We will be using two channel appear card for this purpose. The insight signal is definitely provided in the jack called " micвЂќ by the use of a two route probe, and the output is usually taken from the " earphoneвЂќ jack.
1 ) AS OSCILLOSCOPE
Scopes Furnished by MATLAB
The subsequent text stresses on the pursuing two GUI for oscilloscopes provided by MATLAB 1 . Daqscope
2 . softscope
Daqscope is a simple scope that displays the waveform of the input signal from either with the channels, and offers options pertaining to the maximum and minimum limitations of the waveform. This scope can be initiated by inputting the following keywords in the MATLAB command home window: daqscope
The next daqscope windows appears:
The buttons at the top left spot provide the start and stop control. User can easily select the needed channel; may change the testing rate, size. It also supplies the Auto established option which in turn adjusts the amplitude as well as the x-axis level according to the transmission being supplied. Following display screen shot displays the oscilloscope in action for a sine influx of 1 kHz.
This is certainly another scope provided by MATLAB, which provides many more features than the daqscope. This text throws some mild on a few of these features.
Softscope may be initiated by typing this keywords in the command windowpane: softscope
This screen looks:
After selecting the required properties e. g. sample price or the needed channel, the subsequent oscilloscope screen appears:
This window offers the Horizontal and vertical adjustment properties beneath the channel placing and numerous trigger choices.
After applying a sinusoidal signal (319 Hz) with the left channel (channel 1), and causing the opportunity, the following transmission is demonstrated by the opportunity:
After applying a triangular (1. a few kHz) signal on one channel and a square influx (1 kHz) signal on the other channel,
The outcome of opportunity is shown as:
Softscope provides the next measurement tools that are not found in daqscope which make it a useful scope for various measurements:
Following selecting necessary properties from the measurement tool box, the following window of softscope appears:
Through the menu, the necessary measurement type is chosen. The following screen shot reveals the dimension of imply value of two signals mentioned above:
Similarly, various other measurements can be done. Softscope also offers the facility to create any new measurement because defined by the user, in form of a definite MATLAB function.
Usually, whenever sound greeting card is used to get external sign, the signal is given through a voltage limiter circuit, in order that very high voltages do not get towards the sound cards that can destruction it. Generally, one of the next two circuits is used for this purpose:
This circuit gives output selection between plus one. 4 Versus вЂ“ -1. 4V.
The main advantage of this kind of circuit is usually that the output volts is independent of type voltage. Nevertheless large the input is usually, the output usually lies in these mention selection. The disadvantage of using the signal is that if the voltage lies outside the selection, it is clipped. So the result waveform might not be the same as suggestions waveform.
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The above signal gives outcome by the presented formula:
Vout = - (R2/R1)Vin
Thus if the proportion is...
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