Whenever there is a relative speed between a source of sound and the listener, the apparent frequency of sound listen by the listener is different from the real frequency of sound emitted by the source.
When the distance between the source and listener is decreasing the apparent frequency increases. It defines the apparent frequency is more than the real frequency of voice. The reverse is also true.
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General expression for given frequency n' = [(v + vm) - vL]n/[(v + vm) - vs]
Here n = Actual frequency; vL = Velocity of listener; vS = Velocity of source
vm = Velocity of medium and v = Velocity of sound wave
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Sign convention : All speeds along the direction S to L are taken as positive and all velocities along the direction L to S are taken as negative. If the phase is stationary vm = 0 then n' = (v - vL/v - vS)/n
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