What is the bit rate for CD's?

24-bit digital recording is believed to improve sound quality substantially, as well as increasing the sampling rate. Currently, only certain music DVDs with a 24-bit/96 kHz DTS track use 24-bit audio. However real world systems can not achieve the theoretical noise floor limits of 24-bit (-144.50dB). Practical dynamic ranges of ~110dB are more realistic after accounting for other noise sources other than 24-bit Quantization noise.