Table 2. Relationship between the S/N ratio and standard deviation of error (Hz).

Input frequency 1,000 Hz	S/N (dB)	Standard deviation of error (Hz)
F/V analog device	+20	+/−0.2
	+8	+/−4.1
Autocorrelation+SG	+8	+/−0
	−11	+/−1.8
	−14	+/−4.0