Table 2. Recognition results of each SNR level under four different additive noise conditions.

Noise Type	SNR (in dB)	FFSR	NVFS
Tank	20	71.3	78.4
	15	64.4	75.5
	10	58.8	69.8
	5	53.4	65.6
	0	49.7	62.9
	Average	59.5	70.4
Volvo	20	75.8	81.1
	15	70.5	77.2
	10	63.3	72.9
	5	58.7	68.3
	0	53.6	65.5
	Average	64.4	73.2
F16	20	67.6	75.6
	15	52.4	65.2
	10	44.2	57.3
	5	35.7	50.2
	0	26.1	45.8
	Average	45.3	58.8
Babble	20	63.4	76.7
	15	52.6	63.8
	10	43.4	55.3
	5	36.7	48.2
	0	30.2	42.7
	Average	43.6	57.3