BPFSK is more efficient than BFSK in presence of noise. Why?

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BPFSK is more efficient than BFSK in presence of noise. Why?..

Answer / harish

since in bfsk only audio signals are transmitted and at the
rate of 300 bits per second............

but in bpfsk along vith audio signals pitch is also
transmitted and at the rate of 600-800 bits per second.....

for dat reason bpfsk is more efficient den bfsk........

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