Transmission of Audio
The subject offers a review of basics of audio transmission. The students study classical systems for analog and digital radio-diffusion of audio, as well as modern interactive systems used for radio-diffusion of multichannel audio. The students also gain knowledge on the use of public communications for the purpose of transmitting broadband signals.
- define basic parameters of radiobroadcasting systems
- distinguish analog radiobroadcasting systems based on amplitude and frequency modulation
- analyze digitalization steps of audiosignal depending on chosen sampling frequency and quantization interval
- compare basic principles of audiocoding
- indicate basic differences between present systems for digital radiobroadcasting
- identify problems of transition from analog to digital radiobroadcasting systems
- explain organization of radio station
- define basics parameters which determine acoustic quality of sutios and management rooms
Forms of Teaching
Two lecturing cycles. duration of 1 st is 7 weeks and the second lasts 6 weeeks.Exams
Midterm exam, Final examExercises
Auditory excercisesLaboratory Work
Laboratory will be organized through 6 excercises, each of 90 minutes duration.Experimental Exercises
Visiting professional radio-broadcating station with understanding basics acoustics parameters of control rooms and studio design.
|Type||Threshold||Percent of Grade||Threshold||Percent of Grade|
|Laboratory Exercises||0 %||20 %||0 %||20 %|
|Attendance||0 %||5 %||0 %||5 %|
|Mid Term Exam: Written||0 %||30 %||0 %|
|Final Exam: Written||0 %||30 %|
|Final Exam: Oral||15 %|
|Exam: Written||0 %||60 %|
|Exam: Oral||15 %|
Week by Week Schedule
- Introduction. Basics of sound and hearing process. Basic elements of radicommunication system. Baseband and passband transmission.
- Analog radiobroadcasting systems based on amplitude modulation. Bandwidth of amplitude modulated signal. History of radiobroadcasting.
- Analog radiobroadcasting systems based on frequency modulation. Bandwidth of FM modulated signal. Carsons' rule. Steremultiplex. Radio Data Signal.
- Propagation of electromagnetic waves. Direct and reflected signals. Doppler effect. Radiocommunication channel characteristics in time and frequency.
- Audio signal digitalization. Sampling frequency. Signal to noise ratio by using multibit quantization with Nyquist sampling frequency.
- Oversampling. Signal to noise ratio by using oversampling. Sigma delta converters. Noise shaping.
- Audio signal coding. Frequency and temporal masking. MPEG coding.
- Digital modulation systems. Digital modulation of amplitude and phase. Quadrature amplitude modulation. Bits to symbols transformation. Channel capacity.
- Digital radiobroadcasting systems. Basics of Digital Audio Broadcasting System (DAB) and DAB+ system. Channel coding. Time and frequency interleaving.
- Digital Radio Mondiale (DRM) and DRM+ system. Audio and channel coding.
- Basic characteristics of other digital radio broadcasting systems (DSR, ADR, HD Radio, DVB-T, DVB-T2, DMB).Internet radio. RadioDNS.
- Problems with transitions from analog to digital radio bradcasting systems. Comparison between systems. Digital radio-broadcasting in Croatia.
- Radio-station organization. Acoustic parameters of rooms.
- Final exam