2006-09-23 07:33:04 · 4 answers · asked by aldabok318 1 in Science & Mathematics ➔ Physics
As you say, natural sound is analogue.
The digital bit happens only because we send the analogue signal into an ADC (analogue to digital converter), and the output takes the form of a string of digits, which are more capable of being transmitted through wire or radio without change, and free of some common impairments.
"The expression "digital sound" is something that the media seem to have adopted without regard to the true meaning of the words. It is true that the original sound is analogue, (and microphones, and loudspeakers are strictly analogue devices) but the recorded (DAT or CD) or transmitted (DAB) sound has been sent in a digital format.
Of course, when you listen to the record or the digital radio, the digital signal is converted back to analogue so that it can drive your analogue loudspeaker or headphoneas!
In fact there is really no such thing as digital sound, only digital means of recording and transmission!
2006-09-23 07:54:34 · answer #1 · answered by Rolf 6 · 1⤊ 0⤋
In the recording process, the sound waves are converted from their original analog form (starting just after the microphones) into digital signals by analog-to-digital (A/D) converters. Noise can be filtered from the music by digital signal processing methods, which are more effective than analog methods. The signal is recorded in digital form (compact disc, for example.) When it is played back, the playback device uses a digital-to-analog (D/A) converter.
2006-09-23 07:45:43 · answer #2 · answered by cdf-rom 7 · 2⤊ 0⤋
Because within the system it is handled as a digital signal. This keeps the signal much purer than if it was manipulated as analog.
Original input and output both are analog.
2006-09-23 07:36:38 · answer #3 · answered by Anonymous · 2⤊ 0⤋
Because the origin of the sound was in digital form
2006-09-23 07:34:38 · answer #4 · answered by g8bvl 5 · 1⤊ 1⤋