NSF/STEER Program California State University, Los Angeles Summer 2003 Digital Signal Processing Laboratory Mentored by Dr. Jeffrey Y. Beyon Presented by Kyla C. Ollie

Agenda Introduction Introduction Program Expectations Program Expectations Program Outcomes Program Outcomes LabVIEW Tools LabVIEW Tools The Final Project The Final Project Virtual Equalizer Components Virtual Equalizer Components Future Uses Future Uses Conclusion Conclusion Simulation Simulation

Introduction In the Digital Signaling Processing Laboratory, teachers learned: LabVIEW 7.0 program LabVIEW 7.0 program To construct virtual instruments (VI) that processed, filtered, digitized and displayed time and frequency data To construct virtual instruments (VI) that processed, filtered, digitized and displayed time and frequency data To create Sub VI’s that can be used repeated in in different programs To create Sub VI’s that can be used repeated in in different programs To construct a virtual equalizer for their final project To construct a virtual equalizer for their final project

Program Expectations Expectations before the start of the STEER Program were: Expectations before the start of the STEER Program were: –To assist professors –To acquire useful engineering research skills –To acquire new ideas that will increase the desire and motivation of students for careers in the Engineering and Technology fields

Program Outcome Acquired new skills and knowledge in: Acquired new skills and knowledge in: –Microsoft Office (Excel, PowerPoint & Word) –Technical Writing –Webpage Design (using HTML) Assigned to the Digital Signal Processing Laboratory we were: Assigned to the Digital Signal Processing Laboratory we were: –Assigned LabVIEW 7.0 tutorials & assignments –Constructed programs using Graphical User Interfaces (GUI)

LabVIEW 7.0 Tools Controls, Indicators and Constants Controls, Indicators and Constants Loops Loops Arrays Arrays Output forms Output forms –Waveform Graphs & Charts –Progress Bars Filters Filters –Lowpass (LPF) –Highpass (HPF) –Bandpass (BPF) –Bandstop (BSF)

Filters Lowpass Filter (LPF)Highpass Filter (HPF) Bandpass Filter (BPF) Bandstop Filter (BSF)

The Final Project Both teachers chose to make different types of equalizers for use in their classrooms based upon unique needs. Both teachers chose to make different types of equalizers for use in their classrooms based upon unique needs. Equalizers included Equalizers included –Digital Filters –FFT Chips for Time Domain –Sub VI’s –Convolution of Signal Inputs –Outputs

Virtual Equalizer

Virtual Equalizer Components The virtual equalizer, when linked to a CD player via an audio cable & the computer’s sound card, will display the following components: The virtual equalizer, when linked to a CD player via an audio cable & the computer’s sound card, will display the following components: –Controls for the: Balance Balance 10 Frequency Channels 10 Frequency Channels Volume Volume –Music Waveform Chart –3-D Waveform Graph

Future Plans/Wishes The Virtual Equalizer & LabVIEW 7.0 (student version) could be utilized in the classroom to visually demonstrate and explain: The Virtual Equalizer & LabVIEW 7.0 (student version) could be utilized in the classroom to visually demonstrate and explain: –Properties and characteristics of sound waves –Sound Frequencies –Sine and cosine waves My wish is to return and continue research in other laboratories My wish is to return and continue research in other laboratories

Conclusion This summer’s Research Experiences for Teachers (sponsored by the National Science Foundation & CSULA) using LabVIEW helped in: This summer’s Research Experiences for Teachers (sponsored by the National Science Foundation & CSULA) using LabVIEW helped in: –Acquiring a new programming skill –Developing a new computer-based teaching tool –To develop future stimulating and challenging projects

Thank You I would like to thank several people for making the STEER Program a success: I would like to thank several people for making the STEER Program a success: –Dr. Boussalis –Dr. Beyon –Dr. Dong –Dr. Liu –Dr. Rad –The Graduate and Undergraduate Assistants Virtual Equalizer Simulation Virtual Equalizer Simulation