Compression basics
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A compressor is a device that automatically controls the level of an audio signal to make recordings sound more polished by controlling maximum levels and maintaining higher average loudness. Compressors have different circuit types including valve, optical, FET, and VCA compressors that each impact the audio signal in different ways, such as adding coloration or emulating tube sounds. Parameters like attack, release, ratio, and threshold determine how compression is applied to the audio.
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This document describes a sound to light system that converts music signals into light pulses using three colored LEDs. It employs two operational amplifiers with a total gain of 1000 times to amplify the signal from an electret microphone. The amplified audio signal is then rectified and used to drive an NPN transistor and control the intensity of the LEDs in rhythm with the music. The circuit automatically adapts to the music volume and can operate off a single 9V battery, making it suitable for small, private sound-to-light applications.
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The document provides a history of film sound, beginning with Thomas Edison's 1895 Kinetophone, the first attempt to synchronize sound and moving images. Before 1928, silent films were typically accompanied by live sound effects, music, and recordings. Early experiments in the 1920s recorded sound on discs played in tandem with films. In 1926, Vitaphone and Movietone introduced sound-on-film systems, with Vitaphone recording sound separately on phonograph records. The 1927 film The Jazz Singer was the first feature-length movie with spoken dialogue. Throughout the 1930s and 1940s, surround sound and Foley techniques were developed to improve audio quality and realism, as movie attendance declined with the rise of television.
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A compressor is a device that automatically controls the level of an audio signal to make recordings sound more polished by controlling maximum levels and maintaining higher average loudness. Compressors have different circuit types including valve, optical, FET, and VCA compressors that each impact the audio signal in different ways, such as adding coloration or emulating tube sounds. Parameters like attack, release, threshold, and ratio determine how compression is applied to the audio.
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This document provides instructions for writing a proposal for a commercial music essay. The proposal should include:
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2. Contextual background information on the topic in 500 words using APA referencing style.
3. The proposed structure of the 4000-word essay in 300 words, outlining the main sections and sub-headings.
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Task 1 requires a 1000-word research proposal introducing a subject area and justifying sources. Sources must be listed and their relevance explained.
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Compression basics
- 1. Compression A compressor is a device for automatically controlling the level of an audio signal
- 2. Compression The use of compressors can make recordings sound more polished by controlling maximum levels and maintaining higher average loudness.
- 3. Compression Additionally, many compressors will have a signature sound that can be used to add coloration and tone into otherwise lifeless tracks.
- 4. Compression If a ratio of 2:1 is set, an input signal exceeding the threshold by 2dB will be output with a level of only 1dB over the threshold It 'turns down' the audio when the level exceeds a threshold set by the user
- 5. Compression To make the effect of compression smooth and natural- sounding, compressors often allow attack and release time parameters to be set by the user attack release The output control is used to restore the peak level of the compressed signal to that of the uncompressed input signal
- 6. Valve Compression Valve (or Tube) compressors have a slower response than other forms of compression. Because of this, they have a "vintage" sound that is nearly impossible to achieve with other compressor types.
- 7. Optical Compression Optical compressors affect the dynamics of an audio signal through a light element and an optical cell.As the volume of an audio signal increases, the light element emits more light, which causes the optical cell to lower the volume of the output signal.
- 8. FET Compression FET or “Field Effect Transistor” compressors emulate the tube sound with transistor circuits.
- 9. VCA Compression VCA or "Voltage Controlled Amplifier” compressors use solid state circuits.They are usually cheaper than tube or optical compressors.VCA's also tend to have less "colour" compared to optical or tube compressors— similar to digital vs. analog tape comparison in recording.
- 10. Noise Gates A noise gate mutes the signal when it falls below a certain threshold the rate or release time determines how slowly the gate re-opens