Fig. 3From: JND-based spatial parameter quantization of multichannel audio signalsQuantization codewords distributions in different methods. a High resolution quantization of spatial parameters in MPEG Surround [15], denoted as MPEG_H; b Low resolution quantization of spatial parameters in MPEG Surround [15], denoted as MPEG_L; c Choi’s method [19]; d High resolution quantization in Cheng’s method [20], denoted as Cheng_H; e Low resolution quantization in Cheng’s method [20], denoted as Cheng_L; f Low resolution quantization in SLQP [22], denoted as SLQP_LBack to article page