Cardiac sound simulator

Claim 1

A toy comprising: at least a body portion; a sound generator within said body portion; said sound generator comprising pulse generating means for periodically generating pairs of electrical pulses, wherein the first occurring pulse of each pair has a shorter time duration than the second occurring pulse of said pair and the time between pulses of each pair being less than the time between adjacent pairs of pulses; said pulse generating means comprising a free-running astable and asymmetrical multivibrator having first and second outputs wherein said first output transmits a first train of pulses having a given time duration and said second output transmits a second train of pulses, complementary to said first train of pulses, and having a time duration greater than said given time duration; a univibrator having first and second inputs connected to said first and second outputs, respectively, of said multivibrator for receiving said first and second trains of pulses simultaneously, said univibrator generating a pulse in response to each received pulse, the duration of each generated pulse being equal to the time between the leading edge of a received pulse and a particular point on the trailing edge of said received pulse; and transducer means receiving said electrical pulses for emitting sounds occurring at the leading and trailing edges of said pulses so that the sounds occurring in response to one pulse of the pair are heard as a sound with a first tone and the sounds occurring in response to the other pulse of the pair are heard as a sound with a second tone different from said first tone.