Multimedia Computing · Unit 2
Audio Processing and Speech
Exam-focused notes for Audio Processing and Speech (Multimedia Computing, BIT356): what the TU syllabus asks and how it has actually been tested, with 4 solved past questions from this unit.
What this unit covers
- Speech generation process
- Speech analysis techniques
- Speech transmission systems
- Audio file size calculation
- Sampling rate and bit resolution
- Stereo sound recording
- Time dependent sound concatenation
- Frequency dependent sound concatenation
- MIDI definition and components
- MIDI interface architecture
Time dependent sound concatenation
Differentiate time dependent sound concatenation from frequency dependent sound concatenation. Describe the components of speech transmission systems.[10]
- Definition: Concatenation performed in the time domain by directly joining audio waveforms end-to-end - Method: Audio samples are combined sequentially without transformation - Characteristics: - Simple, direct approach - Preserves original waveform chara...
Full solved answer →MIDI definition and components
Define MIDI. What are the components of a MIDI interface? [5]
MIDI stands for Musical Instrument Digital Interface. It is a standardized protocol and hardware interface that allows electronic musical instruments, computers, and other devices to communicate and synchronize with each other. MIDI transmits musical perfor...
Full solved answer →Speech generation process
Describe the process of speech generation, analysis and transmission.[10]
Speech generation is the process of producing acoustic signals that carry linguistic information. It involves: - Articulatory Process: Speech is generated by the human vocal apparatus: - Air from the lungs passes through the vocal cords (vocal folds) in the...
Full solved answer →Audio file size calculation
Calculate the file size in bytes for a 45 second recording at 40.14 KHz with 16 bits resolution stereo sound. [5]
- Duration: $t = 45$ seconds - Sampling rate: $f = 40.14 \text{ kHz} = 40140 \text{ Hz}$ - Bit resolution (sample size): $b = 16$ bits - Channels: Stereo $\Rightarrow c = 2$ $$\text{File Size (bytes)} = \frac{f \times t \times b \times c}{8}$$ We divide by ...
Full solved answer →Make Unit 2 stick
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