1. Playback pickup:
A sound source stored in a storage medium after being collected by a microphone. For
example tape, radio, DVD, CD, SD card, MP3, MP4, computer, mobile phone, tablet, and
2. On-site pickup:
Pick up the sound through the microphone.Common audio source carriers include a CD
(small compact discs), cassette tapes, LP (compact discs), etc. Now, more advanced new
carriers such as DVD-1 (audio DVD) and SACD (Super Audio CD) have appeared.
In the above carrier, the tape can be repeatedly recorded and recorded, that is, the user can
change the content on the tape, and the information of the other carriers is once filled in by
the factory and cannot be changed.
Of course, with the increasing popularity of computers, CD-R/CD-RW discs, which were
originally designed for the computer industry, are gradually entering the audio field.
CD-R/CD-RW can record messages by themselves, unlike CDs, which only have factory-
produced recording finished products.