A method for determining correctness of a pitch period, comprising: determining, according to an initial pitch period of an input signal in a time domain, a pitch frequency bin of the input signal, wherein the initial pitch period is obtained by performing open-loop detection on the input signal; determining, based on an amplitude spectrum of the input signal in a frequency domain, a pitch period correctness decision parameter, associated with the pitch frequency bin, of the input signal; and determining correctness of the initial pitch period according to the pitch period correctness decision parameter; the method is characterized in that: the pitch period correctness decision parameter comprises a spectral difference parameter, an average spectral amplitude parameter, and a difference-to-amplitude ratio parameter, the spectral difference parameter is a sum of spectral differences of a predetermined quantity of frequency bins on two sides of the pitch frequency bin or a weighted and smoothed value of the sum of the spectral differences of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; the average spectral amplitude parameter is an average of spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin or a weighted and smoothed value of the average of the spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; and the difference-to-amplitude ratio parameter is a ratio of the sum of the spectral differences of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin to the average of the spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; where spectral differences refer to differences between spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin and a spectral amplitude of the pitch frequency bin. determining, according to an initial pitch period of an input signal in a time domain, a pitch frequency bin of the input signal, wherein the initial pitch period is obtained by performing open-loop detection on the input signal; determining, based on an amplitude spectrum of the input signal in a frequency domain, a pitch period correctness decision parameter, associated with the pitch frequency bin, of the input signal; and determining correctness of the initial pitch period according to the pitch period correctness decision parameter; the method is characterized in that: the pitch period correctness decision parameter comprises a spectral difference parameter, an average spectral amplitude parameter, and a difference-to-amplitude ratio parameter, the spectral difference parameter is a sum of spectral differences of a predetermined quantity of frequency bins on two sides of the pitch frequency bin or a weighted and smoothed value of the sum of the spectral differences of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; the average spectral amplitude parameter is an average of spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin or a weighted and smoothed value of the average of the spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; and the difference-to-amplitude ratio parameter is a ratio of the sum of the spectral differences of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin to the average of the spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; where spectral differences refer to differences between spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin and a spectral amplitude of the pitch frequency bin. the pitch period correctness decision parameter comprises a spectral difference parameter, an average spectral amplitude parameter, and a difference-to-amplitude ratio parameter, the spectral difference parameter is a sum of spectral differences of a predetermined quantity of frequency bins on two sides of the pitch frequency bin or a weighted and smoothed value of the sum of the spectral differences of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; the average spectral amplitude parameter is an average of spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin or a weighted and smoothed value of the average of the spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; and the difference-to-amplitude ratio parameter is a ratio of the sum of the spectral differences of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin to the average of the spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin; where spectral differences refer to differences between spectral amplitudes of the predetermined quantity of frequency bins on the two sides of the pitch frequency bin and a spectral amplitude of the pitch frequency bin.