Lena Torres
The concept of pitch is integral to our understanding of music and sound. Pitch is determined by the frequency of a sound wave, which is the number of wavelengths that fit into one unit of time. Sounds with higher frequencies are perceived as having higher pitches, while sounds with lower frequencies are perceived as having lower pitches. While all sounds produce sound waves, not all sounds have an identifiable pitch. For a sound to be perceived as having a pitch, it must have a periodic vibration that lasts long enough for the human brain to process it as such. Sounds with indefinite pitch lack harmonic spectra or have altered harmonic spectra, making it difficult for listeners to discern a specific pitch.
| Characteristics | Values |
|---|---|
| Pitch | Depends on the frequency of a sound wave |
| Frequency | Number of wavelengths that fit into one unit of time |
| High Pitch | High-frequency sound waves |
| Low Pitch | Low-frequency sound waves |
| Sounds with Definite Pitch | Sounds with harmonic frequency spectra or close to harmonic spectra |
| Sounds with Indefinite Pitch | Sounds without harmonic spectra or with altered harmonic spectra |
| Musical Sounds | Sounds with an identifiable pitch, a good or pleasing quality of tone, and a repeating pattern or rhythm |
| Noise | Sounds without an identifiable pitch, no pleasing tone, and no steady rhythm |
| Absolute or Perfect Pitch | The ability to identify by ear any note at some standard pitch or to sing a specified note |
| Human Pitch Perception | Depends on the specific physiology of the auditory system |
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What You'll Learn
- Pitch is determined by the frequency of a sound wave
- Sounds with definite pitch have harmonic frequency spectra
- Pitch is subjective, depending on the human brain to interpret it
- Pitch depends on the sound pressure level (loudness, volume) of the tone
- Absolute pitch is the ability to identify any note at a standard pitch
Pitch is determined by the frequency of a sound wave
The pitch of a sound is determined by the frequency of the sound wave. A high-frequency sound wave is perceived as a high-pitched sound, whereas a low-frequency sound wave is perceived as a low-pitched sound. The frequency of a sound wave is the number of times a wave oscillates or completes a cycle in one second. It is measured in Hertz (Hz). For example, a sound wave that vibrates 440 times per second (440 Hz) corresponds to the musical note A, which is considered a standard pitch. Conversely, a low bass note might be around 110 Hz, resulting in a deeper sound.
The human ear perceives higher frequencies as higher pitches and lower frequencies as lower pitches. The audible range of sound frequencies for humans is between 20 and 20,000 Hz, with the greatest sensitivity to frequencies in the middle of this range. Different organisms have different auditory sensitivities. For example, chickens have a limited audible range of 125 to 2,000 Hz, while mice can hear frequencies from 1,000 to 91,000 Hz.
While frequency is the primary determinant of pitch, other characteristics of sound waves, such as amplitude (which affects loudness), wavelength, and velocity, also play a role in shaping the overall sound. However, these factors do not directly influence pitch perception. For instance, the high-pitched chirping of a bird is due to a high-frequency sound wave, while the low-pitched roar of a lion corresponds to a low-frequency sound wave.
Not all sounds have a clear pitch. Sounds with definite pitch have harmonic frequency spectra or near-harmonic spectra. Unpitched percussion instruments, for example, do not produce specific pitches. Instead, they generate a wide range of frequencies that blend together to create a noisy sound. However, some drums may have standing waves with particular frequencies, giving them a tonal quality.
In summary, pitch is fundamentally determined by the frequency of a sound wave, with higher frequencies corresponding to higher pitches and lower frequencies to lower pitches. Other characteristics of sound waves influence the overall perception of sound but do not directly affect pitch determination.
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Sounds with definite pitch have harmonic frequency spectra
Sounds with a definite pitch have harmonic frequency spectra or near-harmonic spectra. When a sound is produced, it generates multiple modes of vibration that occur simultaneously. A listener hears many frequencies at once. The vibration with the lowest frequency is known as the fundamental frequency, and the other frequencies are called overtones. Harmonics are a significant class of overtones with frequencies that are integer multiples of the fundamental frequency.
The fundamental frequency is also referred to as the first harmonic. The frequency of two times the fundamental will sound one octave higher and is called the second harmonic. A frequency four times the fundamental will sound two octaves higher and is called the fourth harmonic. The more harmonics a sound has, the fuller the quality of the sound. Each person in the world has a unique voice print, or pattern of overtones.
The perception of pitch is determined by the place of maximum excitation on the basilar membrane, according to place theory. A place code must be in effect for the perception of high frequencies since neurons have an upper limit on how fast they can phase-lock their action potentials. However, a purely place-based theory cannot account for the accuracy of pitch perception in the low and middle frequency ranges.
Sounds with indefinite pitch do not have harmonic spectra or have altered harmonic spectra, a trait known as inharmonicity. It is still possible for two sounds of indefinite pitch to be clearly higher or lower than one another. For example, a snare drum sounds higher pitched than a bass drum, although both have indefinite pitch, because its sound contains higher frequencies.
Pitch is a perceptual property that allows sounds to be ordered on a frequency-related scale. Pitch is the quality that makes it possible to judge sounds as "higher" or "lower" in the sense associated with musical melodies. Pitch may be quantified as a frequency, but it is not an objective physical property. Instead, pitch is a subjective psychoacoustic attribute of sound.
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Pitch is subjective, depending on the human brain to interpret it
The human perception of pitch is a subjective phenomenon that depends on the brain's interpretation of sound waves. Pitch is influenced by the frequency of sound waves, with higher frequencies corresponding to higher pitches and vice versa. However, pitch is not solely determined by frequency but also by other factors such as the mass and tension of the vibrating object. For example, tightening the strings of a musical instrument increases the tension, resulting in a higher pitch.
The human ear detects sound waves through vibrations in the air, which cause the eardrum and tiny bones within the ear to vibrate. These vibrations are then interpreted by the brain as sound. The pitch of a sound is determined by the frequency of these vibrations, but not all vibrations result in a perceivable pitch. Sounds with a clear pitch have harmonic frequency spectra or near-harmonic spectra. The fundamental frequency is the vibration with the lowest frequency, and other frequencies are overtones.
Some sounds, like those produced by percussion instruments, may lack a clear pitch. These sounds are characterised by inharmonicity, where the harmonic spectra are altered or absent altogether. However, even sounds without a definite pitch can be perceived as relatively higher or lower in pitch compared to others. For example, a snare drum may sound higher-pitched than a bass drum due to its higher frequencies, despite both lacking a specific pitch.
The perception of pitch also varies among individuals. Some people possess absolute or perfect pitch, which is the rare ability to identify or produce a specific note accurately. This ability is believed to be linked to specialised brain development in areas responsible for processing sounds associated with music. However, the majority of people do not possess absolute pitch, and their perception of pitch may be influenced by factors such as memory and familiarity with musical instruments.
Additionally, cultural and historical factors can influence pitch standards. For example, the conventional pitch in music has varied over time, with different standards adopted by various musical groups and regions. These variations in pitch standards highlight the subjective nature of pitch perception and the role of human interpretation in establishing pitch references.
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Pitch depends on the sound pressure level (loudness, volume) of the tone
While pitch is related to frequency, they are not the same. Frequency is the scientific measure of pitch, and it is the number of wavelengths that fit into one unit of time. Pitch, on the other hand, is subjective and depends on the human brain's interpretation of these frequencies.
The pitch of a sound is largely determined by the mass (weight) of the vibrating object. Generally, the greater the mass, the slower the vibration and the lower the pitch. For example, a heavy E string on an instrument can be made to sound higher than a thin E string by tightening the tuning pegs, thereby increasing the tension on the string.
Additionally, pitch depends on the sound pressure level (loudness or volume) of the tone, especially at frequencies below 1,000 Hz and above 2,000 Hz. The pitch of lower tones decreases as sound pressure increases. For instance, a 200 Hz tone that is very loud may seem one semitone lower in pitch than if it were barely audible. Conversely, above 2,000 Hz, the pitch increases as the sound gets louder.
The perception of pitch also depends on the place of maximum excitation on the basilar membrane within the ear. This place theory, however, cannot account for the accuracy of pitch perception in the low and middle frequency ranges. Furthermore, some non-human primates lack auditory cortex responses to pitch despite having clear tonotopic maps.
It is worth noting that not all sounds have a clear pitch. Sounds with a definite pitch have harmonic frequency spectra or near-harmonic spectra. A listener can typically discern the pitch of such sounds, which consist of a fundamental frequency and additional frequencies that are harmonics of that fundamental. In contrast, sounds with indefinite pitch lack harmonic spectra or have altered harmonic spectra, making it difficult for listeners to identify a specific pitch.
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Absolute pitch is the ability to identify any note at a standard pitch
Absolute pitch, also known as perfect pitch, is a rare ability that enables a person to identify or recreate a given pitch without the need for a reference tone. It is considered an act of cognition, requiring memory of the frequency, a label for the frequency, and exposure to the range of sound associated with that label. For example, a person with absolute pitch can accurately reproduce a heard tone on a musical instrument without searching for the correct pitch. This ability is often associated with synesthesia, where certain notes or keys are associated with different colours, enabling individuals to identify any note.
Absolute pitch is distinct from relative pitch, which involves identifying intervals directly by their sound rather than naming specific pitches. While relative pitch is more common among musicians, absolute pitch can complement or influence its development. Some individuals with relative pitch can learn "pseudo-absolute pitch" and develop the ability to identify notes in a manner resembling absolute pitch.
The existence of absolute pitch has been debated, and its development in adulthood was once thought to be impossible. However, studies have shown that adults can acquire this skill through training, challenging the notion of a "critical period" for sensitivity. The ability may be related to an individual's auditory working memory and their capacity to remember and assign meaning to sounds.
Absolute pitch can be demonstrated through linguistic labelling, associating mental imagery with a note, or sensorimotor responses. For instance, individuals with absolute pitch can name individual pitches played on various instruments, identify the key of a given piece of tonal music, or name all the tones of a chord. This ability extends beyond musical contexts, allowing individuals to identify the pitches of everyday sounds, such as car horns or sirens.
While absolute pitch is not a prerequisite for skilled musical performance or composition, it can impact a musician's experience. Musicians with absolute pitch may encounter challenges when perceiving music that has been transposed from its original key or is performed at a non-standard frequency. They may perceive these variations as “wrong" or "out of tune" due to their sensitivity to pitch accuracy.
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Frequently asked questions
Pitch is the position of a single sound in the complete range of sound. Sounds are higher or lower in pitch according to the frequency of vibration of the sound waves producing them. A high frequency is perceived as a high pitch and a low frequency is perceived as a low pitch.
Sounds need to have an identifiable pitch to be considered music. However, not all sounds have an identifiable pitch. Sounds with indefinite pitch do not have harmonic spectra or have altered harmonic spectra. Sounds with a definite pitch have harmonic frequency spectra or close to harmonic spectra.
When you clap your hands or bang on a table, you are hearing the instantaneous pressure wave of air rushing away as you strike something. There is no periodic vibration, so there is no pitch.
