Subjective Evaluation of Music Compressed with the ACER Codec Compared to AAC, MP3, and Uncompressed PCM

Table 3

Summary noise and distortions scores: WAV, MP3 192, and AAC 192 (n=68). A score of 1 represents imperceptible noise and distortions and a score of 5 represents perceptible noise and distortions.

Song	WAV		MP3 192		AAC 192
	Mean	SD	Mean	SD	Mean	SD
Uptown Funk	2.85	1.38	2.56	1.36	2.77	1.32
Elastic Heart	2.58	1.34	2.77	1.36	2.60	1.33
These Days	2.55	1.27	2.56	1.24	2.50	1.23
Heroes (We Could Be)	2.98	1.38	2.92	1.35	2.91	1.39
When the Beat Drops Out	2.21	1.22	2.28	1.17	2.23	1.24
Dangerous	2.68	1.34	2.72	1.34	2.70	1.42
GDFR	2.29	1.27	2.28	1.22	2.32	1.18
Doing It	2.64	1.29	2.72	1.31	2.71	1.34
Make Me Feel Better	2.40	1.33	2.45	1.35	2.36	1.22
What Kind of Man	2.62	1.31	2.42	1.23	2.59	1.26
Grand Mean	2.58	1.31	2.57	1.29	2.57	1.29