Table 1: The RWCP environmental sound database.

Sound type Kind of materials Instances

Impact sound Wood plates 12
Metal cans, boxes, and so forth 10
Plastic cases 3
Glass cups, bottles, and so forth 8
Bundle of paper 1
Handclap/handclaps 4

Falling pieces Grains 2
Coin/coins 7
Dice 3

Air jet Small air pump 1
Spray 1
Firecracker 1
Air bubbles 1
Dryer 1

Friction sound File 1
Sand paper 2
Saw 2

Musical instruments Castanets 1
Cymbals 1
Drum 1
Horn 1
Kara 1
Maracas 1
Ring 1
String 1
Whistle 3
Tambourine 1

Phone, buzzer Buzzer 1
Clock alarm 2
Phone 4
Toys 3

Open Cap 2

Broken Chopsticks 1
Tearing paper 1
Crumpling paper 1

Release Clip 2

Shaking Metal bell/bells 7

Rotation Coffee mill 1

Others Doorlock 1
Leaf through a book 2
Mech bell 1
Padlock 1
Punch 1
Shaver 1
Stapler 1