1. A method for speech recognition implemented by a speech recognition device comprising: receiving a first speech signal issued by multiple users; performing analog to digital conversion on the first speech signal to generate a first digital signal after the analog to digital conversion; extracting a first speech parameter from the first digital signal, the first speech parameter describing a speech feature of the first speech signal; if the first speech parameter coincides with a first prestored speech parameter in a sample library, executing control signaling instructed by the first digital signal, the sample library prestoring prestored speech parameters of N users, N≧1; wherein extracting the first speech parameter from the first digital signal comprises: performing signal filtering on the first digital signal so as to obtain at least a first sub signal corresponding to a first user and a second sub signal corresponding to a second user from the filtered first digital signal; extracting, from the first sub signal, a second speech parameter that describes a speech feature of the first sub signal, and extracting, from the second sub signal, a third speech parameter that describes a speech feature of the second sub signal; wherein the first speech parameter comprises the second speech parameter and the third speech parameter.
1. A method for speech recognition implemented by a speech recognition device comprising: receiving a first speech signal issued by multiple users; performing analog to digital conversion on the first speech signal to generate a first digital signal after the analog to digital conversion; extracting a first speech parameter from the first digital signal, the first speech parameter describing a speech feature of the first speech signal; if the first speech parameter coincides with a first prestored speech parameter in a sample library, executing control signaling instructed by the first digital signal, the sample library prestoring prestored speech parameters of N users, N≧1; wherein extracting the first speech parameter from the first digital signal comprises: performing signal filtering on the first digital signal so as to obtain at least a first sub signal corresponding to a first user and a second sub signal corresponding to a second user from the filtered first digital signal; extracting, from the first sub signal, a second speech parameter that describes a speech feature of the first sub signal, and extracting, from the second sub signal, a third speech parameter that describes a speech feature of the second sub signal; wherein the first speech parameter comprises the second speech parameter and the third speech parameter. 4. The method according to claim 1 , wherein if the first speech parameter coincides with the first prestored speech parameter in the sample library, executing control signalling instructed by the first digital signal comprises: determining whether the sample library comprises a second prestored speech parameter that coincides with the second speech parameter, and/or a third prestored speech parameter that coincides with the third speech parameter; if the sample library comprises a second prestored speech parameter that coincides with the second speech parameter, executing control signalling instructed by the first sub signal; and/or, if the sample library comprises a third prestored speech parameter that coincides with the third speech parameter, executing control signalling instructed by the second sub signal.