Describe the Linguistic Hirachy
1. Pragmatics: Meaning / Intention of the user uttering something
2. Semantics: Content (factual information)/ meaning of single sentences -> relationship between sign and dedicated meaning
3. Syntax: Sentence structure
4. Morphology: Word forms (subentities builded up to form words)
5. Phonology: spoken Sound structure
6. Phonetics: Articulation / Acoustics / Perception -> How spoken sounds are articulated, how they are manifested in acoustics and how they are perceived
What is a phoneme?
Phoneme:
• “...smallest segmental unit of sound employed to form meaningful contrasts between utterances...” (from International Phonetic Association, 1999)
• example: functional contrast between “pit” and “bit”
• Phoneme -> different Phonological classes
So phoneme is a functional class which is restricted to a given language
What is a phone?
Phone:
• Smallest phonetic unit of speech
• Often used in terms of concrete realization of a phoneme (parole vs. langue). (used to produce phoneme)
• Phone -> different Phonetic classes
What is a allophone?
Allophone:
• Different phones of the same phoneme
Distributed complimentarily
Free (regional, social) variants
phoneticaly different but functionally, phonologicaly not different
example (german): ich vs ach
What is the difference between a morpheme and a syllable?
Morpheme: Smallest unit of speech carrying meaning.
• Speech: Sequence of phones of individual phonemes.
• Written language: Grapheme sequences.
Syllable: Phonetic, not meaning-related unit; smallest group of phones in natural speech production process.
• Contains exactly one syllable-peak, typically vowel or “double-vowel” (diphthong).
• Can contain one or more consonants.
Morpheme – syllable distinction: different decompositions; example “painter”.
• Syllable: “pain-ter”.
• Morpheme: “paint-er”
What is the frequency range in which the human ear can detect sound?
What kinds of hearing do you see here?
Name the parts of the human ear
What’s prosody?
- Provides information about linguistic and paralinguistic aspects
Type of expression (statement, question, etc.)
Emotional state of speaker; irony/sarcasm; agreement, disagreement, etc.
- Linguistic consideration
Quantity: Especially temporal structure of speech (pauses-, phone- & syllable durations, rhythm &speed)
Accent(uation)
Intonation: Speech melody
- Physical
Amplitude
Duration.
Pitch / fundamental frequency F0.
Function of the outer ear
directional hearing
Pinna: important for spatial hearing, causes diffraction at high frequencies
Ear canal: The sound is transmitted through the ear canal which is about 25 mm long and 7 mm high. As an approximation, it can be interpreted as a resonator with a closed end at the eardrum and an open end at the other side. If the length matches 𝜆⁄4, resonance occurs. The transmission of sound therefore reaches its maximum at the corresponding frequency (about 3 kHz for a length of 25 mm).
-> Pinna & ear canal are acoustic resonance system.
-> Resonance modes depend on distance and directional location of sound source(s) relative to the head
Ear drum: The incoming sound waves cause an oscillation of the ear drum which allows it to transfer them further to the middle ear
-> Pressure sensor.
-> Excitation of oscillation due to sound waves
Function Middle Ear:
Impedance matching air/liquid (physical medium
inner ear)
The middle ear transmits the oscillations from the ear drum via the oval window to the inner ear.
Because the inner ear contains fluid, an impedance matching between inner ear and outer ear is required to prevent strong reflections.
This impedance matching is achieved through a length difference between malleus and incus as well as through an area difference between eardrum and oval window
Function of the inner ear:
Signal pre-processing for further processing by
higher levels (related to Fourier analysis)
Inner hair cells: Transform the movements of the basilar membrane to nerve impulses
Outer hair cells: nonlinear amplification (most at low sound levels)
Basilar membrane: Frequency analysis – High frequencies cause a movement at the beginning of the basilar membrane, low frequencies cause a movement at the end of the basilar membrane
What influences spatial hearing?
- posible due to outer ear
- sound on both ears is compared and position of sound is calculated
- possible parameters: volume, pitch, time of sound arrival
Is 2 sone the doubled loudness of 1 sone?
Yes
How much is 1 and how much is 2 sone in phone?
Relation between phon and sone is logarithmic (from 1 sone):
1 sone at 40 phon
2 sone at 60 phon
What are ITD and ILD and at what frequency range are they importent for the human localization?
ITD is the Interaural Time Difference and mostly imporant for lower frequencies (< 1,5 kHz). But at higher frequencies we use in complex sounds the envelope of broadband signals to localize the sound sources. (temporal difference of sound incidence)
ILD is the Interaural Level Difference and most important at higher frequencies (> 1,5 kHz) (sound pressure level difference between ears)
What types of maskings exist?
Spectral superposition, spectral masking.
→ Increase of hearing threshold for test signal due to masker.
Temporal aspects → temporal masking
Pitch Perception requisite
- Periodicity of signal (spectral energy-distribution -> timbre)
- Sufficient number of periods (> 20)
- Pitch ≡ fundamental frequency
- Condition for pitch perception: Presence of 3 subsequent harmonics
What is pitch?
- Physical/technical: Sound event scale of pitch (harmonic)
- 1 octave = doubling of frequency
- Perceptive: Auditory event scale of pitch (melodic) ≡ tonality
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