Bit-depth expansion of digital audio is essential for enhancing the quality of digital contents in re-mastering and up-conversion processes. The current study predicts the least significant bits for the bit-depth expansion from upper bits in linearly quantized samples of a framed audio waveform. A simulated annealing technique is applied to minimize the effective power of the residual signal derived from linear prediction of the framed waveform by localizing positions of the least significant bit (LSB) to be added in the frame. The results of computer simulation using various genres of 100 mono and 10-s music signals exhibit that the mean correct rate of the predicted LSB is 72% using 8-bit quantized waveforms. Measurements of the objective sound quality degradation reveal that the mean objective difference grade (ODG) of the 8-bit signals improved from -2.96 to -2.56 after addition of the predicted LSB.
Author:
Nishimura, Akira
Affiliation:
Tokyo University Information Sciences, Chiba-shi, Japan
AES Convention:
146 (March 2019)
Paper Number:
10179
Publication Date:
March 10, 2019
Subject:
DSP: Part 2
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.