Sienna Rhodes
Sound is an integral part of the cinematic experience, with audio and video working together to create a unique and immersive experience for the viewer. The development of sound film has had a significant impact on the film industry, with early sound films utilising theatre organs, live orchestras, and musicians to provide soundtracks and sound effects. Over time, sound technology has evolved, with the introduction of sound-on-film processes, digital sound formats, and improvements in recording and playback standardisation. Despite the initial challenges of synchronisation, playback volume, and recording fidelity, the inclusion of sound has enhanced the emotional impact of films and improved the overall viewing experience.
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What You'll Learn
Synchronization of picture and sound
The synchronization of picture and sound in films has been a challenge since the early days of cinema. The first known public exhibition of projected sound films took place in Paris in 1900, but it wasn't until the 1920s that sound motion pictures became commercially practical. One of the biggest obstacles to early sound film was achieving reliable synchronization. Pictures and sound were recorded and played back by separate devices, which were difficult to start and maintain in tandem.
Several early sound-film systems were presented at the Paris Exposition in 1900, including the Cinemacrophonograph or Phonorama, and the Phono-Cinéma-Théâtre, which allowed short films of theater, opera, and ballet excerpts to be presented. However, these early systems had low sound quality and were cumbersome to use, requiring performers to be stationed directly in front of the recording devices.
In the 1920s, there was a groundswell in commercial sound motion picture exhibition, with films like The Jazz Singer and Walt Disney's The Skeleton Dance, the first entry in his "Silly Symphony" series, pioneering the use of sound and color in motion pictures. The first Indian talkie, Alam Ara, was released in 1931, shot using sync sound. During this time, filmmakers experimented with multiple microphone setups and overlapping dialogue, and by 1933, technology was introduced that allowed filmmakers to mix separately recorded tracks for background music, sound effects, and synchronized dialogue.
The development of sound-on-film technology further advanced synchronization. Sound-on-film processes record the sound accompanying a picture on photographic film, usually on the same strip of film carrying the picture. This technology eventually became the universal standard for synchronized sound cinema. In the 1960s, filmmaker Richard Leacock developed the "Direct Cinema" method, where the camera speed was controlled by one oscillator, and a second oscillator in the recorder generated the Pilotone, allowing filmmakers to abandon the studio and film on location with handheld cameras. Today, digital video cameras and digital sound recorders synchronize electronically, and sound remains an essential part of the cinematic experience, enhancing the emotional impact and immersion of the story.
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Playback volume
The introduction of electric amplification systems, such as the Gaumont Elgéphone, based on the Auxetophone, aimed to address this issue. However, these early innovations had limited commercial success due to their high cost and failure to satisfactorily resolve synchronization and recording fidelity issues.
The challenge of achieving sufficient playback volume in the early days of sound film was not just limited to the theatre setting. Early sound films often utilised live orchestras, theatre organs, and musicians to provide the soundtrack and sound effects during screenings. This additional layer of immersion for the audience presented its own set of challenges in terms of volume control and ensuring that the live audio complemented the film without overwhelming it.
With advancements in technology, modern recording equipment and editing software have revolutionised the sound effects industry. Sound effects can now be amplified and enhanced in post-production to ensure they are audible and impactful. This allows filmmakers to create a cohesive audio experience that enhances the visuals and guides the audience's emotions and expectations.
Today, surround sound systems and advanced audio technologies have transformed the cinematic experience. Films like "Tenet" and "Gravity" showcase the power of sound design, with intricate soundscapes that envelop viewers and heighten their sensory experience. The right balance of volume and audio effects can create a thrilling and visceral experience without being overwhelming.
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Recording fidelity
The early years of sound film were marked by technical challenges, including the issue of recording fidelity. Fidelity, in the context of audio recording and reproduction, refers to the degree of accuracy with which a sound is captured and reproduced. The goal of achieving high fidelity is to capture the essence of the original sound and reproduce it as accurately as possible.
In the early days of sound film, the audio technology of the time could not fill large spaces with sound. Performers had to station themselves directly in front of cumbersome recording devices, which severely limited the types of films that could be created with live-recorded sound. The introduction of sound film also had consequences for other technological aspects of cinema. Proper recording and playback of sound required the standardization of camera and projector speed, and a new standard of 24 frames per second was established.
Sound-on-film processes can record an analog or digital sound track, either optically or magnetically. Early sound-on-film technologies used sound-on-disc methods, where the film's soundtrack was on a separate phonograph record. Later, sound-on-film processes recorded sound magnetically on ferric oxide tracks bonded to the film print. Today, sound-on-film processes typically use optical sound tracks, which are backward compatible with older magnetic tracks.
The development of stereophonic equipment and recordings in the 1950s and 1960s marked the next wave of home audio improvement. This period is regarded as the "Golden Age of Hi-Fi", when vacuum tube equipment manufacturers produced many models considered superior by modern audiophiles. The concept of high fidelity continued to refer to the goal of highly accurate sound reproduction and the technological resources available to achieve this goal.
Several factors contribute to fidelity in audio recording and reproduction, including frequency response, distortion, noise, dynamic range, and phase coherence. Frequency response describes the range of frequencies that a recording or playback system can accurately reproduce with minimal distortion or attenuation. A flat frequency response is essential for accurately reproducing sound, as it ensures that every frequency is reproduced with equal accuracy and amplitude. Distortion refers to any unwanted changes to the sound signal that occur during the recording or playback process, and it can affect the overall quality and accuracy of a recording.
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Standardization of camera and projector speed
The standardization of camera and projector speed was a crucial aspect of the evolution of cinema, particularly with the introduction of sound films. Before the standardization, silent films were shot at variable speeds, with frame rates ranging from 12 to 40 frames per second (fps). The "standard silent film speed" was considered to be 16 fps, but in reality, there was no industry-wide standard, and speeds could vary widely during a single show.
The introduction of sound films in the late 1920s brought about a significant change. It was soon realized that variable frame rates made sound unlistenable, and a new, strict standard of 24 fps was established. This standardization ensured that the playback of sound was consistent, as varying the speed of a recording also varies its pitch. The 24 fps speed was chosen not only for its audio benefits but also for mathematical reasons, as it is easily divisible, aiding editors in making specific time cuts.
The standardization of camera and projector speed had a significant impact on the filming process as well. Previously, cameras were often undercranked or overcranked to improve exposures or for dramatic effect. Overcranking, or shooting at a higher frame rate, creates a slow-motion effect when played back at the standard speed. Undercranking, on the other hand, involves shooting at a lower frame rate, resulting in a fast-motion effect. With the standardization, filmmakers had to adapt their techniques to work within the constraints of the new frame rate.
The shift to standardized speeds also impacted projection practices. During the silent era, projectors were hand-cranked, allowing projectionists to vary the speed at their discretion or based on instructions from distributors. With the introduction of electric motors in projectors, a more uniform frame rate was achievable. However, the transition to standardized speeds was not immediate, and some early sound films may have been projected at incorrect frame rates, impacting the viewing experience.
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Sound-on-film processes
Sound-on-film can be dated back to the early 1880s, when Charles E. Fritts filed a patent claiming the idea. In 1923, a patent was filed by E. E. Ries for a variable-density soundtrack recording, which used a mercury vapour lamp to create a variable-density soundtrack. Later, Case Laboratories and Lee De Forest attempted to commercialize this process by developing an Aeolite glow lamp. In 1928, Fox Film purchased Case Laboratories and produced its first talking film, In Old Arizona, using the Aeolite system. The variable-density sound system was popular until the mid-1940s.
In the early 1920s, variable-area sound recording was first experimented with by the General Electric Company and later refined by RCA. After the mid-1940s, the variable-area system superseded the variable-density system and became the major analog sound-on-film system. The most prevalent current method of recording analogue sound on a film print is by stereo variable-area (SVA) recording, a technique first used in the mid-1970s as Dolby Stereo. A two-channel audio signal is recorded as a pair of lines running parallel to the film's direction of travel through the projector's screen.
Earlier sound-on-film processes used magnetic recording on 70 mm and 35 mm film prints, with ferric oxide tracks bonded to the film print outside the sprocket holes. 16 mm and Super 8 formats sometimes used a similar magnetic track on the camera film. However, film of this form is no longer manufactured, and single-perforated film without the magnetic track is now commonly used, allowing for an optical sound track. In the early 21st century, distributors changed to using cyan dye optical soundtracks on colour stocks, eliminating the need for a separate black-and-white emulsion on the soundtrack portion of the film. This change required theatres to replace incandescent exciter lamps with complementary coloured red LED or laser exciters.
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Frequently asked questions
Sound in films adds an extra layer of immersion for audiences, allowing them to feel like they are a part of the world on screen. It is an essential part of the cinematic experience, evoking emotions and ideas, and creating a powerful and emotional experience for the audience.
Sound film faced three major problems in its early days. Firstly, synchronisation was difficult as pictures and sound were recorded and played back by separate devices. Secondly, achieving sufficient playback volume was challenging. Finally, the recording fidelity was low, with primitive systems requiring performers to stand directly in front of the recording devices.
The three essential categories of film sound are human voices (dialogue), music, and sound effects. Dialogue serves as the primary means of communication between the characters and the audience, while music helps to establish the setting and time period of the film, as well as evoking emotions. Sound effects are added in post-production to make certain effects louder and to guide the audience's expectations.
Sound-on-film processes record an analog or digital soundtrack either optically or magnetically, usually on the same strip of film as the picture. Earlier technologies used a separate phonograph record for the soundtrack.
