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Toshiba IR Test Apparatus Project. Ahmad Nazri Fadzal Zamir Izam Nurfazlina Kamaruddin Wan Othman. Signal Flow from TV to Devices. Signal Flow (Cont.). Modulation Electric signal is modulated with a carrier signal Carrier signal has frequency of 36-40 kHz LED Emit IR signal Photodiode
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Toshiba IR Test Apparatus Project Ahmad Nazri Fadzal Zamir Izam Nurfazlina Kamaruddin Wan Othman
Signal Flow (Cont.) • Modulation • Electric signal is modulated with a carrier signal • Carrier signal has frequency of 36-40 kHz • LED • Emit IR signal • Photodiode • Act as a sensor • Detect any infrared signal • Convert IR signal back to electric signal
Signal Flow (Cont.) • Filter • Reject interference signals • Bandpass filter with center frequency of 38 kHz ± 2 kHz • Demodulation • Reject carrier signal
Specification • National Instruments Data Acquisition Device • Model: NI PCI-6533 (DIO-32HS) High Speed Pattern I/O and Handshaking • 20 MHz maximum transfer rate • 32 digital input output lines • 8, 16 or 32 bits transfers • Start and Stop triggering, pattern and change detection • 32 MB onboard memory per data path • NI-DAQ driver included • This device will convert analog signal to digital patterns signal.
Specification (Cont.) • Computer • Operating System: Windows 2000/NT/XP • RAM: 128 MB RAM • 4x CD-ROM drive • 1 GB free hard disk space • 500 MHz Intel Pentium III • Software • Receive signals as inputs, and analysis of the signals as output • C++ language based software to analyze and test the output signals • The software has user-friendly interface.
Specification (Cont.) • Creating Database • The output signals from the television will be analyzed and their characteristics will be stored in a reasonably compact manner. • Sample at least 4 different brand of DVD and VCR signals • Operator will designate a 'name' for each particular signal. • A database of known signal will be created. • Search capability to access signal database
Specification (Cont.) • Testing Mode • Program will instruct user to drive the TV using remote control • The program will analyze the signals and compare them with signals from database. • The program then will log pass/fail result to user interface and text file. • The program will also display the statistics of the test signal comparing with the known signal in the database. • Signal length • Position where errors occur • Type of error • Display statistic in table • Graphical display of expected versus failed infrared signal pulse train.
What We are Going to Do • Familiarized with the TV • Research on C++ program codes • Design software layout