Tyler Wynn
The phonograph, also known as a gramophone, record player or turntable, is a device for the mechanical reproduction of sound. Invented by Thomas Edison in 1877, it was a groundbreaking achievement that allowed for the first-ever recording and playback of sound. The phonograph captures sound by translating sound energy into a physical form or recording. When a person speaks into a phonograph, their vocal vibrations are transmitted to a diaphragm, which vibrates a stylus that traces the sound waves onto a rotating cylinder or disc covered in a thin layer of soft material, typically wax.
| Characteristics | Values |
|---|---|
| Inventor | Thomas Edison |
| Date of Invention | 1877 |
| Other Inventors | Alexander Graham Bell, Emile Berliner |
| Components | Turntable, Stylus, Diaphragm, Pickup, Amplifier, Loudspeaker |
| Function | Converts acoustic energy into mechanical energy to record sound |
| Recording Process | Vocal vibrations transmitted to the diaphragm, which vibrates a stylus that traces sound waves onto a rotating cylinder or disc covered in a thin layer of soft material |
| Early Recording Materials | Tin foil, Wax |
| Later Recording Materials | Wax-coated cardboard cylinders, Flat discs with spiral grooves |
| Sound Quality | Poor, with background noise and surface imperfections |
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What You'll Learn
The phonograph's diaphragm and stylus
The phonograph was invented by Thomas Edison in 1877. It was a groundbreaking achievement that allowed for the first-ever recording and playback of sound. The device used a diaphragm and stylus to capture sound waves onto a rotating cylinder coated with a special material.
The diaphragm and stylus are two of the key components of the phonograph. The diaphragm is a vibrating mechanism that captures sound waves and transmits them to the stylus. The stylus is a needle-like structure that traces the sound waves onto a rotating cylinder or disc covered in a thin layer of soft material, typically wax. As the stylus moves along the surface, it creates grooves corresponding to the sound waves, effectively capturing the audio information.
During the playback process, the stylus is placed on the previously recorded grooves, and as the cylinder or disc rotates, the stylus follows the grooves and vibrates. These vibrations are then transmitted to the diaphragm, which converts the mechanical energy back into sound waves, allowing the recorded sound to be heard.
Edison's early phonographs recorded onto thin sheets of metal, usually tinfoil, which was wrapped around a helically grooved cylinder. The sound waves caused the diaphragm to vibrate, and the stylus on the diaphragm made indentations in the foil, creating a hill-and-dale pattern. This process was later improved by Alexander Graham Bell, who introduced the use of wax-coated cardboard cylinders and a floating stylus that incised the cylinder rather than indented it.
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How sound waves are captured
The phonograph, also known as a gramophone, record player, or turntable, is a device that captures and reproduces sound through several mechanical processes. Invented by Thomas Edison in 1877, the phonograph was a groundbreaking device that revolutionised the way we experience music and audio technology.
The process of capturing sound with a phonograph involves several key components: a rotating cylinder or disc-shaped platform, a stylus, and a diaphragm. When a person speaks into the phonograph, their vocal vibrations are transmitted to the diaphragm, a small disc made of mica or aluminium. The diaphragm then vibrates, transmitting these vibrations to the stylus, a needle-like structure. The stylus traces the sound waves onto the rotating cylinder or disc, which is coated in a thin layer of soft material, typically wax or metal foil. As the stylus moves along the surface, it creates grooves corresponding to the sound waves, effectively capturing the audio information. Louder sounds produce deeper grooves, while quieter sounds create shallower grooves.
In the early days of phonographs, the recordings were made on cylinders coated with tin foil or wax. The stylus would etch delicate grooves onto the cylinder, capturing the essence of the sound but often with a significant amount of background noise and surface imperfections. These early recordings had a distinct and almost mesmerizing sound quality, with a touch of mechanical charm. However, they were very delicate and prone to distortion, making reproduction difficult.
Improvements were made over time, and in the late 19th century, Emile Berliner introduced the use of flat discs with spiral grooves, coining the term "gramophone." This design became the standard for the next 100 years of phonographic record players. Later, Alexander Graham Bell's Volta Laboratory made further improvements, including the use of wax-coated cardboard cylinders and a cutting stylus that moved in a zigzag groove. In the early 20th century, methods for moulding disc records were improved, and by 1915, the 78-RPM record became the standard, offering a playing time of about 4.5 minutes per side.
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The rotating cylinder
During playback, the process is reversed. The stylus is placed on the previously recorded grooves, and as the cylinder rotates, the stylus follows the grooves and vibrates. These vibrations are then transmitted to a diaphragm, which converts the mechanical energy back into sound waves, allowing the recorded sound to be heard.
The use of cylinders in phonographs eventually declined in favour of flat discs, with Emile Berliner initiating the transition in the 1890s. However, the cylinder phonograph played a pivotal role in the development of audio technology, revolutionising the way we experience music and paving the way for modern-day devices that utilise recorded sound.
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The transition to flat discs
The flat disc record, also known as a "78" by collectors, was typically made of a brittle material with a shellac resin and played at a speed of around 78 revolutions per minute. The earliest discs were created between 1898 and the late 1950s, with shellac being the most common material used. During World War II, when shellac supplies were limited, some 78 rpm records were pressed in vinyl instead.
The disc phonograph record became the dominant commercial audio distribution format throughout most of the 20th century. It offered advantages such as a lower price, ease of use, and better storage compared to cylinders. The superior sound quality of the flat disc record also contributed to its popularity. The lateral cut recording technique, which became the norm around 1920, offered a level of fidelity that was adequate for the standard of equipment available to the general public.
Improvements to the phonograph over the years included modifications to the turntable and its drive system, stylus, pickup system, and sound and equalization systems. The use of 8-track cartridges and cassette tapes in the 1960s, followed by the rise of the compact disc in the 1980s, eventually led to a decline in the use of phonographs. However, records have experienced a revival since the late 2000s, with a niche resurgence in the early 21st century.
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The evolution of the stylus
The stylus, or needle, is a key component of the phonograph, which was invented by Thomas Edison in 1877. The stylus vibrates a diaphragm that produces sound waves, which are then transmitted to a rotating cylinder or disc. The stylus is responsible for tracing the sound waves onto the rotating cylinder, creating grooves that correspond to the sound waves, effectively capturing the audio information.
Early phonographs recorded onto thin sheets of metal, usually tinfoil, which was wrapped around a grooved cylinder. The stylus indented the foil into the cylinder's groove, creating \"hill-and-dale\" variations in the depth of the indentation. However, tinfoil tore easily, and even when the stylus was properly adjusted, its reproduction of sound was distorted and only good for a few playbacks.
In the 1880s, Alexander Graham Bell's Volta Laboratory made significant improvements to the phonograph, introducing the graphophone, which used wax-coated cardboard cylinders and a cutting stylus that moved in a zigzag groove around the record. This addressed the issues with tinfoil, as wax was more durable and allowed for better sound reproduction.
In the 1890s, Emile Berliner initiated the transition from phonograph cylinders to flat discs with spiral grooves, coining the term "gramophone" for disc record players. Berliner's innovation led to further modifications in the turntable and its drive system, stylus, pickup system, and sound and equalization systems.
The debate continues on the impact of stylus shape on record and stylus wear. Spherical styli, for example, have a limited initial contact area with the record groove, which some argue causes less damage to records under lighter tracking forces. On the other hand, elliptical styli have been shown to produce less wear on records due to their increased surface contact with the groove. Companies like Shure have developed increasingly sophisticated stylus tip shapes to improve surface contact and reduce wear.
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Frequently asked questions
A phonograph is a device for the mechanical and analogue reproduction of sound.
When a person speaks into a phonograph, the vocal vibrations are transmitted to the diaphragm. The diaphragm then transmits the vibrations through a needle or stylus. The needle is placed in contact with a soft material, such as metal foil or wax, and as the foil or wax drum is turned, the sound vibrations are pressed into the material, creating a physical line recording of the sound.
A stylus is a needle-like structure that traces the sound waves onto a rotating cylinder or disc covered in a thin layer of soft material, typically wax.
During playback, the stylus is placed on the previously recorded grooves, and as the cylinder or disc rotates, the stylus follows the grooves and vibrates. These vibrations are then transmitted to a diaphragm, which converts the mechanical energy back into sound waves, allowing us to hear the recorded sound.
The phonograph was invented by Thomas Edison in 1877.
