DIGITAL AUDIOTAPE(DAT)(1975)

STOCKHAM'S SOUND STREAMS, INC.,LEADS THE WAY IN AN ALTERNATIVE RECORDING SYSTEM.

Digital  tape format is a magnetic tape data storage format developed bu Sony. the cassette consist of two real with a helical scan process

Until the 1980 s, most commercial audio recording were made according to analog principles, with the original sound modulated onto another medium, the physical characteristics of which are directly related to the original sound. In contrast, digital recording sees the original sounds converted to digital information and stored as a series of 1s and 0s known as "bits"

Although the principles of digital digital recording were already in place in the late 1930, it was not until 1975 that a usable commercial system was developed, when Dr. Thomas Stockham (1933-2004) established sound stream, Inc., the first dedicated digital recording company. The original audio was passed through an analog digital converter (ADC), converted to 16-bit audio, and stored on a 1 inch(2.54 cm) Honeywell tape deck. To play back the sound, the digital analog converter(DAC). The system offered the highest quality sound without any of the problems a analog recording. Mechanical deficiencies comanly associated with analog equipment were radically improved.

Competing systems, such as those produced by 3M, Sony, and JVC appeared in quick succession, but for the rest of decades it was stockhams system that dominated. From the early 1980 s, the Sony DASH and Mitsubishi ProDigi formats rendered previous systems obsolete. At the same time Sony's DAT cassette format become the de facto standard for making digital stereo recording. All of these format remained in use until the early 1990 s, after which hard disk recording began its gradual domination.

DAT is a standard medium technology for the digital recording of audio on tape at professional level of quality