1/16/2024 0 Comments Mini dv video camera recorder![]() ![]() The drum that houses the heads is a polished metal cylinder that’s angled in the cassette compartment and rotates at a very high rate. We’ve seen the brains, but now we’ve come to the brawn – the spinning drums that record data onto the tape and read it off. These packets move at a rate of 25Mbps (megabits per second), which translates to roughly 3.5MB of disk storage space per second of DV video. Every one of these packets – each the size of a single DV track – contains four independent regions: a subcode sector for time code and other data, a video sector, an audio sector and a sector for insert editing and track data. The whole package is finally bundled in data packets compliant with the DV standard. Digital video data travels in tiny packets and the DV hardware adds unique codes that verify and correct corrupted data bits. Error correction Also added to the data mix are error correction bits.This information includes time code, time/date information and digital pilot tone signals to replace the conventional control track of analog video, which the DV format lacks. Vital data All of this pristine but compressed digital information is bundled with additional vital pieces of generated data.Alternately, a 32kHz sample rate with a 12-bit depth yields two stereo tracks (4 channels total), one of which can be used for voiceover narration. An audio sample rate of 48kHz (with a 16-bit depth per sample) produces a single track of high-fidelity digital stereo audio (2 channels). Audio A separate sampling process takes the audio signal (after pre-amplification) and turns it into data as well. ![]() This is accomplished with a 5:1 DCT (discrete cosine transform) mathematical algorithm that discards as much unnecessary image information as possible while retaining much of the quality of the original image.
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