Sound emitting ball

A sound emitting ball, comprising

• (a) a ball having an airtight bladder for giving impact resilience to the ball in which compressed air is charged through an air injection valve,
• (b) a concave housing provided within the ball on the opposite portion of the bladder with respect to the valve and contacting the surface of the bladder while keeping the airtightness of the bladder,
• (c) a cover for concealing an opening in the housing,
• (d) means for detecting an external force applied to the ball and producing a signal in response thereto,
• (e) means comprising of an integrated circuit for generating a sound signal according to the signal from the detecting means,
• (f) means for emitting sound according to the signal from said sound signal generating means, and
• (g) a battery power source for said above detecting means, sound signal generating means and emitting means, said detecting means, said sound signal generating means, said emitting means and said battery power source being accommodated in the housing, and such that the sum of the weights of the housing, the cover, said detecting means, said sound signal generating means, said emitting means and said battery power source does not substantially interfere with the impact resilience of the ball and is substantially the same as the weight of the valve.