Chapter 11 Flashcards
At what rate are all languages spoken?
About the same rate, between 8-12 phonemes per second
This rate is consistent across different languages.
What is speech production described as?
A continuous sequence
of articulatory gestures
in the vocal tract
flowing from one segment to the next.
What is required for a listener to understand a rapid incoming speech signal?
perceive discontinuities or breaks in the flow of speech sounds
What is psychophysics?
The study of the relationship between the physical properties of a stimulus and the sensation response
It explores how physical stimuli are perceived and interpreted.
What is pitch in relation to frequency?
Pitch is the perceptual correlate of frequency
It refers to how high or low a sound is perceived.
How does intensity affect pitch?
Higher intensity can influence the perception of pitch.
What is loudness in relation to intensity?
Loudness is the perceptual correlate of intensity
It describes how loud a sound is perceived.
How does frequency affect loudness?
Different frequencies can be perceived as having different loudness.
What is the difference between volume and loudness?
Volume is NOT a perceptual correlate; it is an audio control
Volume refers to the adjustable level of sound output on devices.
Fill in the blank: _______ is an audio control on devices like a TV or computer.
[Volume]
It is commonly referred to as a knob for adjusting sound.
What is the relationship between hearing sensitivity and frequency?
Hearing sensitivity is frequency dependent
How do two pressure waves at different frequencies with the same dB level compare in terms of loudness perception?
They will be perceived as having different loudness levels
What is the minimal difference in intensity between two sounds at the same dB level that can be perceived as different loudness levels (JND)?
About 1 dB for soft sounds at 30-40 dB in low to midrange frequencies
What is the JND for loud sounds?
About one-third to one-half dB
What psychoacoustic scale is used for measuring intensity?
Phon Scale
What is the reference frequency for the phon scale?
1000 Hz pure tone
A 1000 Hz pure tone is equal to how many phons?
60 phons
What does it mean when the 60 phon line is described as equally loud?
It is equally loud across all frequencies as a 1000 Hz tone at 60 dB
How does the human ear’s sensitivity vary across frequencies?
The human ear is less sensitive at lower frequencies
Fill in the blank: The minimal difference in intensity perceived in soft sounds at low to midrange frequencies is _______.
1 dB
True or False: The phon scale is an objective measure of loudness.
False
What is the Sone Scale?
A psychoacoustic scale for intensity based on loudness.
What is the range of phóns used in the Sone Scale?
About 40 to 100 phóns.
How was the Sone Scale developed?
By asking people to subjectively judge when a sound doubled in loudness relative to a 1000 Hz tone at 40 dB.
What loudness level is referenced as one sone?
A 1000 Hz tone at 40 dB.
What is the increase of sones for every 10 dB increase?
An increase of one sone.
True or False: Every increase of 10 dB corresponds to an increase of two sones.
False
What is the relationship between phóns and sones in the Sone Scale?
As phóns increase, the number of sones doubles for each 10 dB increase.
At which frequencies can we perceive smaller differences?
At lower frequencies.
This suggests that our auditory system is more attuned to changes in pitch when the frequencies are lower.
Which frequency comparison is easy to locate?
120 Hz vs. 220 Hz.
This indicates that the difference in pitch is easily perceptible at lower frequencies.
Which frequency comparison is difficult to perceive?
1000 Hz vs. 1100 Hz.
This demonstrates that as frequencies increase, it becomes more challenging to detect differences in pitch.
How many tones are in the Western chromatic musical scale?
12 tones
Each tone is separated by a semitone.
What is a semitone?
One-half step, the smallest distance or interval between two pitches
Semitones are essential in defining the chromatic scale.
Define the term ‘tone’ in music.
A whole step, which is two semitones
Tones are larger intervals than semitones.
What is an octave?
An interval between one musical pitch and another with double its frequency
Octaves are fundamental in music, representing a complete cycle of pitches.
True or False: The chromatic scale consists of notes that are all a whole tone apart.
False
The chromatic scale consists of notes that are a semitone apart.
What is nonlinear perception of pitch?
Greater sensitivity to differences between lower pitches compared to higher pitches
This indicates how humans perceive pitch in a nonlinear manner.
How many semitones are in an octave?
12 semitones
An octave represents a doubling of frequency.
What does invariance refer to in speech perception?
The property of remaining constant or unchanged
Invariance is significant in understanding speech sounds.
What does a lack of invariance imply?
Not constant, subject to change
It indicates variability in acoustic features and formant patterns.
What can cause a lack of acoustic-phonetic invariance?
Coarticulation and suprasegmental (prosodic) effects
These factors lead to changes in perceived consonants.
Is there a one-to-one relationship between acoustic features and perceived consonants?
No
The relationship is not fixed, leading to variability in perception.
Why is identifying the unit of analysis important in speech perception theories?
It is crucial for understanding communication between speaker and listener
The unit of analysis helps in transferring bits of information representing phoneme features.
What needs to happen to the bits of information in the acoustic signal?
They need to be chunked or encoded
This process increases efficiency in perception.
What is an example of encoding features in speech?
Encoding features into phonemes, which are then encoded into syllables
This helps manage the information overload during processing.
Can the acoustic waveform be segmented using purely acoustic criteria?
Yes
This includes events such as formant transitions and noise bursts.
Does segmentation of the waveform using acoustic criteria consistently relate to listener perception?
No
Listener perception may differ from acoustic segmentation.
What is a unique feature of the onglide formant pattern?
It is unique for each vowel
Different vowels exhibit distinct onglide formant patterns.
What acoustic cues lead to the perception of the plosive /d/?
Variability in onglide formant patterns and VOT
Despite different cues, all plosives are perceived as /d/.
What is perceptual normalization?
The process of simplifying or smoothing out unnecessary variability in an acoustic signal
This process enhances efficient comprehension.
What factors can listeners use to identify individual speakers?
- Age and gender of the speaker
- Emotional intent of speaker
- Semantically important parts of an utterance
These factors are identified suprasegmentally.
What must listeners do for efficient comprehension in speech?
Use and ignore variability in the speech signal
This helps listeners effectively process spoken language.
What causes variability among speakers?
- Differences in physical properties of the larynx and vocal tract
- Age and gender of the speaker
- Habits of articulation
- Suprasegmental features like speaking rate
These factors contribute to the normalization process.
True or False: When told that what we’re hearing is not speech, we typically perceive speech sounds.
False
The perception of sounds can be influenced by contextual information.
What is debated regarding speech perception?
Whether it involves specialized, uniquely human neural processes
This question explores the nature of speech recognition mechanisms.
Fill in the blank: Normalization is the process of _______ unnecessary variability in an acoustic signal.
smoothing out
This helps in achieving more efficient comprehension.
What level has research primarily focused on in perception?
The segmental level
However, the suprasegmental level is also crucial in normalization.
What is a key goal of perceptual normalization?
More efficient comprehension
This goal drives the normalization of variability in speech signals.
What is duplex perception?
The simultaneous perception of nonspeech and speech stimuli extracted from segments of the speech signal
Defined by Rand in 1974
Give an example of duplex perception.
Two syllables that differ by only a single acoustic cue, such as /da/ and /ga/
The example highlights the critical difference in the transition of F3
What does the base sound represent in duplex perception?
The same sound for both syllables, which does not sound specifically like one or the other
The base is an isolated component
What occurs during a dichotic listening task in duplex perception?
The listener hears the chirp in one ear and the ambiguous base sound in the other
This setup aids in studying the perception of speech versus nonspeech sounds
What do listeners perceive in duplex perception?
The chirp and either /da/ or /ga/ as a complete syllable
Perception depends on the onset frequency of the F3
True or False: Speech perception takes precedence over nonspeech perception.
True
This suggests that meaningful sounds like speech are prioritized
Fill in the blank: Duplex perception suggests that _______ sounds take precedence over non-speech sounds.
meaningful
This highlights the importance of speech in auditory perception
What is the McGurk Effect?
The incongruity between visual and auditory stimuli resulting in a unique speech sound perceived
The effect demonstrates how visual information can influence auditory perception.
What does the McGurk Effect support?
The theory of a unique mechanism for the perception of speech
It suggests that speech perception may involve specialized processes.