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why students need to learn digital signal processing
- 1. 05/22/25 Digital SignalProcessing 1 Digital Signal Processing (DSP) Hartono Pranjoto
- 2. 05/22/25 Digital SignalProcessing 2 Outline • Why use DSP • What is DSP • DSP applications • DSP in our daily life • DSP makes technology easier to use • Summary
- 3. 05/22/25 Digital SignalProcessing 3 Mengapa DSP • DSP is everywhere (ada dimana-mana) • DSP is in our lives (no denial) • DSP is applied in many engineering technology • Civil eng. • Mechanical eng. • Aeronautics eng. etc • DSP makes life easy • DSP makes life more enjoyable • DSP safes our lives (ex. heart pacemaker)
- 4. 05/22/25 Digital SignalProcessing 4 Arti kata DSP (Digital signal processing) (1/2) • Digital means: all data are in numbers (digit) so that a computer can manipulate the numbers for further use • Signal means: sign, mark, identification in many forms, but in electrical engineering signals are in the form of electrical signal in voltage or current or frequency
- 5. 05/22/25 Digital SignalProcessing 5 Arti kata DSP (Digital signal processing) (2/2) • Processing means: a process or manipulations to the signals that are already in the form of electrical signal in digital form • Processing the signal: • Make the signal bigger or smaller (voltage) • Eliminate certain signal • Add or strengthen certain signal • Do some filtration to the signal
- 6. 05/22/25 Digital SignalProcessing 6 Signal that we know • Signal that can be capture by our sensors such as: • Hot/ cold • Bright/ dark • High/ low, direction etc. • Perception of signs can use intermediate or alternate sensor • Signal that can be sensed is always in the form of analog signal that must be converted into voltage and then coverted further into digital
- 7. 05/22/25 Digital SignalProcessing 7 Signal in the form of voltage • Voltage is easier to manipulate such as: • Make it bigger or smaller • Easy transfer in short distance • Massless • Conversion into voltage can be done using many different sensors such as: • Temperature sensor, pressure sensor • Direction and speed sensor • Light, color, intensity sensors etc.
- 8. 05/22/25 Digital SignalProcessing 8 What is DSP (main topics) • DSP = digital signal processing • All processes are conducted in digital form with the use of digital computers All signals must be in the form of digital and must be converted from analog into digital • After all the process, all digital signals must be reconverted back into analog form All digital signal must be convered back into the form of analog signal • Process in digital form: • Copying (make duplication) • Storage (for further use at latter time) • Transformed in mathematical form • Transferred in a great distance • Can be compressed (is is a process or not?)
- 9. 05/22/25 Digital SignalProcessing 9 Digital signal processing • DSP = digital signal processing • Analog signal is converted into digital signal • Digital signal is then processed furter (copy, transformed, store, transfer, etc) • Digital signal is converted back into analog signal Komputer ADC Sinyal analog DAC Sinyal analog
- 10. 05/22/25 Digital SignalProcessing 10 Process in digital form is better • Copy of digital signal be the same as the the original • Digital storage is ‘forever’ • Mathematical transformation will result in the same output all the time • Long distance transfer will give the same result (Source Destination) • Compression/ decompression will result in the same data
- 11. 05/22/25 Digital SignalProcessing 11 DSP applications • CD, (VCD), MP3, DVD, Television, HDTV • GSM/ CDMA telephone • Security (keamanan) • Film teater (Dolby ProLogic® , Dolby Digital, DTS, THX) • Voice and image recognition • VoIP • MRI/CAT-scan • ECG, EEG • Etc
- 12. 05/22/25 Digital SignalProcessing 12 High Definition Television
- 13. 05/22/25 Digital SignalProcessing 13 Normal Television
- 14. 05/22/25 Digital SignalProcessing 14 High Definition Television
- 15. 05/22/25 Digital SignalProcessing 15 Example of CD, LD, TV, DVD • CD is digital music/ voice • MP3 is compressed voice • Laser disc is digital picture • VCD is LD with compression • Televisi digital • Scanning frequency > 50 Hz • Resolution up to 1920 x 1080 • DVD can store higher capacity picture with better quality
- 16. 05/22/25 Digital SignalProcessing 16 Telepon GSM (1/3) • Sending voice: – Convert sound into digital signal – Digital signal is compressed – Compressed signal is encrypted – Signal is send to the RBS • Receiving voice: – Signal is received from RBS – Signal is de-crypted – De-crypted signal is uncompressed – Digital signal is converted into analog signal (voice)
- 17. 05/22/25 Digital SignalProcessing 17 Telepon GSM (2/3) • Most complicated device in unit volume cm3 • Can do millions of mathematical calculation per- second • Connection with provider is less than 1 sec (even roaming) Dari telepon Ericsson
- 18. 05/22/25 Digital SignalProcessing 18 Telepon GSM (3/3)
- 19. 05/22/25 Digital SignalProcessing 19 Security • Baggage check at the airport • Inspect metal or any other material without opening luggage
- 20. 05/22/25 Digital SignalProcessing 20 Other security implementation
- 21. 05/22/25 Digital SignalProcessing 21 Example in movies and theaters • Majority sound in movies is stereo • Sound comes from the left and right hand side only • Stereo sound does not provide spatial effect • For better effect, the sound signal is converted into digital signal • Digital signal is further processed using computer into Dolby Digital Prologic or similaric • Two channel stereo into Dolby Digital 5.1 or similar • The process is conduted in real time together with the picuture
- 22. 05/22/25 Digital SignalProcessing 22 MRI/CAT-scan
- 23. 05/22/25 Digital SignalProcessing 23 Why do we have to learn DSP (1/3) • The future is DSP Electronics has changed technology for the past 50 years DSP is changing the technology now DSP has been proven to be utilized in the future • DSP changes failure into success • DSP has changed pictures into more beautiful pictures
- 24. 05/22/25 Digital SignalProcessing 24 Why do we have to learn DSP (2/3) • Problems are solved into three simple steps (1) put problems into words; (2) change the words into mathematical formula and (3) realize into compute program • DPS solutions can be performed using simple programs (see examples ) • Do not use complex numbers in computer programs Computer does not understand complex numbers Therefore do not use complex numbers
- 25. 05/22/25 Digital SignalProcessing 25 Why do we have to learn DSP (3/3) • Many filters and signal process can be implemented in digital counterpart • Others already implement DSP
- 26. 05/22/25 Digital SignalProcessing 26 Conclusion • DSP is important • DSP is cheap • DSP is easy • DSP is now and • DSP is the future • DSP = $$$
- 27. Materials to bedownloaded • Available on local network 192.168.11.253mahasiswaDigital S ignal Processing • Username: mahasiswa • Password: mahasiswa • Available only for academic year 2014-2015 05/22/25 Digital Signal Processing 27