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[8] [9] [11] [10] This optimal setting improves linearity at mid-range frequencies but reduces dynamic range and causes a drop in high-frequency response, which is offset with pre-emphasis in the recording chain. [9] [11] Recording very low wavelengths at tape speeds of 4.76 cm/s (1.87 in/s) and 9.53 cm/s (3.75 in/s) presents another challenge.
DC bias is the addition of direct current to the audio signal that is being recorded. AC bias is the addition of an inaudible high-frequency signal (generally from 40 to 150 kHz) to the audio signal. Most contemporary tape recorders use AC bias. When recording, magnetic tape has a nonlinear response as determined by its coercivity. Without bias ...
The frequency response for a conventional LP player might be 20 Hz to 20 kHz, ±3 dB. The low-frequency response of vinyl records is restricted by rumble noise (described above), as well as the physical and electrical characteristics of the entire pickup arm and transducer assembly. The high-frequency response of vinyl depends on the cartridge.
The record/replay frequency response was tested at four levels: +6 VU, 0 VU, −10 VU and −20 VU (Dolby Level is marked at +3 VU for the CT-93). Thus, these plots provide data on the linearity of the different tape formulations at both high and moderate recording levels.
A high-speed camera is a device capable of capturing moving images with exposures of less than 1 / 1 000 second or frame rates in excess of 250 frames per second. [1] It is used for recording fast-moving objects as photographic images onto a storage medium.
Muybridge's photographic sequence of a race horse galloping, first published in 1878. High-speed photography is the science of taking pictures of very fast phenomena. In 1948, the Society of Motion Picture and Television Engineers (SMPTE) defined high-speed photography as any set of photographs captured by a camera capable of 69 frames per second or greater, and of at least three consecutive ...
A scene demanding high dynamic range, taken with the Nikon D7000 digital camera, capable of 13.9 stops of dynamic range per DxOMark. [51] The unedited version of the digital photo is to the left, while the shadows have been pushed heavily in Photoshop to produce the final image on the right.
Measurement is usually made on a 3.15 kHz (or sometimes 3 kHz) tone, a frequency chosen because it is high enough to give good resolution, but low enough not to be affected by drop-outs and high-frequency losses. Ideally, flutter should be measured using a pre-recorded tone free from flutter.