An Efficient Adaptive Window Size Selection Method for Improving Spectrogram Visualization

Table 1

Adaptive window selection from proposed method, where is estimation, is the standard deviation, is the optimal threshold (1500), and is the window size.

Signal	Type			Decision
Heartbeat (Figure 6)	Low	90.99	135.49	STFT	5816
Mridangam (Figure 7)	Intermediate	527.61	706.89	STFT	1003
Carriers (Figure 8)	Intermediate	386.13	722.57	STFT	1371
Radio (Figure 9)	Intermediate	2632.8	542.37	STFT	201
High carrier (Figure 10)	High	10425	1117	STFT	51
Music (Figure 11)	Mixed	2170	2160	CQT	Variable
Speech (Figure 12)	Mixed	810.15	1302	CQT	Variable