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This is the complete lecture note for LIN 403 Acoustic Phonetics. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: LIN 403 Course title: Acoustic Phonetics Course credit load: 3 Units Series 1: Foundations of Acoustic Principles in Speech Series 2: Properties and Analysis of Speech Sound Waves Series 3: Acoustic Displays: Waveforms, Frequency, and Spectrograms Series 4: Applications of Acoustic Phonetics in Fieldwork Series 5: Interrelationships of Acoustic, Articulatory, and Perceptual Correlates Proposed Outline for Series 1 Part 1: Introduction to Acoustics in Speech • Sub-Part 1.1: Definition and Scope of Acoustics • Sub-Part 1.2: Importance of Acoustic Phonetics in Linguistics Part 2: Fundamental Properties of Sound Waves • Sub-Part 2.1: Frequency, Amplitude, and Duration • Sub-Part 2.2: Waveforms and their Characteristics Part 3: Principles of Speech Sound Production • Sub-Part 3.1: Acoustic Correlates of Speech Sounds • Sub-Part 3.2: Relationship between Acoustic and Articulatory Features Part 4: Tools and Methods in Acoustic Analysis • Sub-Part 4.1: Introduction to Acoustic Analysis Software • Sub-Part 4.2: Practical Applications in Speech Study Introduction Speech is one of the most distinctive features of human communication, and its study requires us to look beyond the surface of spoken words into the physical properties that make them possible. Acoustic phonetics provides the scientific foundation for understanding how speech sounds are produced, transmitted, and perceived. By examining the acoustic principles underlying speech, learners gain insight into the measurable characteristics of sound and how these relate to linguistic analysis. This Series sets the stage for the rest of the course by equipping you with the essential background needed to interpret speech as a physical phenomenon.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS The aim of this Series is to introduce you to the basic acoustic principles that govern speech and to prepare you to analyse speech sounds using both theoretical knowledge and practical tools. We shall commence this Series by exploring the definition and scope of acoustic phonetics, highlighting its relevance to the study of language. Next, we will examine the fundamental properties of sound waves, including frequency, amplitude, and duration, as well as the nature of waveforms. Following that, we will consider the principles of speech sound production, focusing on the acoustic correlates of speech and their link to articulatory features. Finally, we will round off the Series by introducing the tools and methods used in acoustic analysis, with particular attention to software applications and their role in speech research. Series Learning Outcomes Upon completing this Series, you should be able to: • SLO 1.1 define acoustic phonetics and explain its scope within the study of speech, • SLO 1.2 describe the relevance of acoustics to linguistic and phonetic analysis, • SLO 1.3 explain the fundamental properties of sound waves, including frequency, amplitude, and duration, • SLO 1.4 analyse the characteristics of waveforms in relation to speech sounds, • SLO 1.5 identify the acoustic correlates of speech sounds and relate them to articulatory features, and • SLO 1.6 demonstrate the use of basic acoustic analysis tools and software in speech research. 1.1 Introduction To Acoustics In Speech 1.1.1 Definition and scope of acoustic phonetics Acoustic phonetics is the branch of phonetics concerned with the physical properties of speech sounds as sound waves. It examines measurable aspects such as frequency (the number of vibrations per second), amplitude (the strength or intensity of the sound), and duration (the length of time a sound lasts). These properties can be displayed visually through graphs and spectrograms, allowing speech to be studied scientifically. By engaging with acoustic phonetics, you will be able to connect the abstract study of language with concrete, observable data. This makes it possible to evaluate speech sounds objectively and compare them across different speakers and contexts. Fill in the blank: Acoustic phonetics focuses on the ______ properties of speech sounds.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Figure 1.1: Transmission of speech sound waves 1.1.2 Relevance of acoustics in speech studies The study of acoustics is highly relevant to speech analysis because it provides a scientific basis for describing and categorising sounds. For instance, frequency determines pitch, while amplitude relates to loudness. These measurable properties allow linguists to distinguish between sounds that may seem similar to the ear but differ in their acoustic structure. Acoustic phonetics also plays a crucial role in applied fields such as language teaching, speech therapy, and forensic linguistics. By using acoustic analysis, professionals can identify speech patterns, diagnose speech disorders, or even verify speaker identity. Fill in the blank: The measurable property of sound that determines its pitch is called ______. Box 1.1: Selected applications of acoustic phonetics Pilot questions 1.1 1. What branch of phonetics studies the physical properties of speech sounds? 2. Which measurable property of sound refers to its strength or intensity? 3. What visual tool can be used to represent speech sounds scientifically?
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 4. Which property of sound determines pitch? 5. What does amplitude relate to in speech sounds? 6. Give one example of how acoustic phonetics is applied in language teaching. 7. How can acoustic phonetics assist in forensic linguistics? 8. Why is acoustic phonetics considered essential in diagnosing speech disorders? 1.2 Basic Concepts Of Sound Waves 1.2.1 Frequency, amplitude, and duration Frequency refers to the number of vibrations or cycles a sound wave completes in one second, measured in hertz (Hz). It determines the pitch of a sound, with higher frequencies producing higher pitches and lower frequencies producing lower pitches. Amplitude is the measure of the strength or intensity of a sound wave. It is directly related to loudness, meaning that greater amplitude produces louder sounds, while smaller amplitude produces softer sounds. Duration refers to the length of time a sound persists. In speech, duration can distinguish between sounds, such as short and long vowels. Fill in the blank: The property of sound that determines its loudness is called ______. Figure 1.2: Basic properties of sound waves 1.2.2 Waveforms and their properties A waveform is a visual representation of how a sound wave varies over time. It shows the changes in amplitude as the sound progresses. By examining waveforms, linguists can identify patterns such as periodicity, which indicates whether a sound is voiced or voiceless.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Waveforms are particularly useful in speech analysis because they allow us to see the temporal structure of sounds. For example, consonants often appear as irregular bursts, while vowels show more regular periodic patterns. Fill in the blank: A waveform is a ______ representation of how a sound wave varies over time. Plate 1.1: Comparison of vowel and consonant waveforms Pilot questions 1.2 1. What property of sound determines pitch? 2. Which property of sound is directly related to loudness? 3. What does duration measure in speech sounds? 4. What is a waveform used to represent? 5. How can waveforms help distinguish between vowels and consonants? 1.3 Principles Of Speech Sound Production 1.3.1 Acoustic correlates of speech sounds Acoustic correlates are the measurable features of speech sounds that correspond to their articulatory production. For example, vowels typically show regular periodic waveforms with clear formant structures, while consonants often display irregular bursts or noise patterns. These correlates allow us to identify whether a sound is voiced or voiceless, nasal or oral, and high-pitched or low-pitched. By studying acoustic correlates, learners can link the physical properties of sound waves to the linguistic categories used in phonetics and phonology. This connection is essential for accurate transcription and analysis of speech. Fill in the blank: Vowels are usually represented by ______ periodic waveforms with clear formant structures.
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Figure 1.3: Acoustic correlates of vowels and consonants 1.3.2 Relationship between acoustic and articulatory features Speech sounds are produced through the movement of articulators such as the tongue, lips, and vocal folds. These movements create acoustic patterns that can be measured and analysed. For instance, raising the tongue in vowel production changes the resonance of the vocal tract, which is reflected in the formant frequencies of the sound. The relationship between acoustic and articulatory features is therefore reciprocal: articulatory actions shape acoustic outputs, and acoustic analysis helps us infer articulatory behaviour. This interplay is central to phonetic research and practical applications such as speech synthesis and recognition. Fill in the blank: Raising the tongue in vowel production changes the ______ frequencies of the sound. Plate 1.2: Articulatory positions and acoustic features Pilot questions 1.3 1. What are acoustic correlates in speech analysis? 2. How do vowels typically appear in waveforms compared to consonants?
LA-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS 3. Which articulators are involved in shaping speech sounds? 4. What happens to formant frequencies when the tongue is raised during vowel production? 5. Why is the relationship between acoustic and
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