Session (CD) - Bit Rate

Bit Rate

The audio bit rate is 1,411.2 kbit/s (as 2 channels × 44,100 samples per second per channel × 16 bits per sample = 1,411,200 bit/s = 1,411.2 kbit/s). Likewise, in a computer, audio data coming in from a CD drive is accessed by sectors, each sector being 2,352 bytes, and with 75 sectors containing 1 second of audio, for the same bit rate of 2,352 × 75 = 176.4 KiB/s (1,411.2 kbit/s). In comparison, the bit rate of a "1×" CD-ROM is defined as 2,048 bytes per sector × 75 sectors per second = 150 KiB/s (1,228.8 kbit/s). The undecoded channel-data rate for a Red Book audio CD is 4.3218 Mbit/s, with 2.0338 Mbit/s being the rate of the undecoded audio and subcode.