Digital Audio Recording

Audio sounds be able to be digitally recorded on magnetic tape using the same sampling technique described at the rise of this chapter. The sound ripple is sampled at a high tax of speed and its amplitude in digital figure is recorded on the tape.

To go a high-quality recording, the value of sampling must be at smallest twice the frequency of the highest honorable the human ear can detect. The scope of sound that most people be possible to hear consists of frequencies from a shabby of 20 cycles per second to a proud of 20,000 cycles per support. Consequently, digital sound recording techniques

illustration the sound waves being recorded at a value of at least 40,000 epochs per second (40 KHz). The sampling process produces a steady stream of remarkable??• waveform values 1/40,000 of a support (25 nanoseconds) apart. The actual banner sampling rates for digital recording are 44.1 and 48 KHz, the one and the other somewhat higher than the

40 KHz copy given. Some formats of digital audio recording practice sampling rates that are much higher in prescription to further increase the quality of the uninjured.

An analog-to-digital converter (ADC) performs the sampling procedure and expresses the values as binary numbers (0???s and 1???s and nothing else). It is this digital information, tolerably than the analog waveform itself, that is recorded. Because in that place is a lot of digital intelligence to record, and it must exist recorded rapidly in order to preserve up with the playing music or speaking voices, digital audio tape (DAT) is not recorded in short tracks running down the length of the tape, while shown with analog recording in Figure 6-2.

Digital hearty is recorded by a rotating noddle that very rapidly ???swipes??? short tracks of recorded premises across the tape at an crotch as the tape moves forward attached the reels. The tape head is rotating at 2,000 rpm and with equal rea~n can record the large amount of data required for high-fidelity digital try. Digital tapes cannot be cut or spliced, still, because the dense, angular recording method is disrupted ~ the agency of any break in the tape. Figure 6-5 shows in what manner digital audio tape (DAT) is recorded with angled tracks. As the measurements on the figure indicate, the recording tracks mouldiness be very precisely placed and be possible to be read only by a digital tape mimic configured in exactly the same style as the recording machine.

Digital solid can also be recorded on other attractive media such as computer disks and firm drives, although usually not in the corresponding; of like kind format as on