Apparatus and method for speech recognition using user prompt

A method for speech recognition, the method comprising:

• changing a user prompt that induces utterance for speech recognition into a sound source and playing the sound source;
• extracting a microphone detection signal when a speech of a user is received as a speech signal through a microphone;
• removing the user prompt from the microphone detection signal;
• recognizing a speech based on a value from which the user prompt is removed;
• outputting a response related to the speech based on a result of recognizing the speech;
• extracting a domain value (Rdn) and a speech recognition result value from the result of recognizing the speech;
• acquiring a result value (Rt) output as text from the speech recognition result value;
• extracting a keyword from the result value (Rt) output as text and transmitting the extracted keyword to a server;
• acquiring a sound source (Rdn(x)) corresponding to the keyword extracted from the server;
• mixing the sound source Rdn(x) corresponding to the keyword extracted from the server, the user prompt (Mp), and the result value (Rt) output as text;
• and
• outputting a mixed result,
• wherein acquiring the sound source Rdn(x) further includes acquiring, from a database, a background sound corresponding to a domain value (Rdn) output from the speech recognition result,
• wherein the microphone detection signal includes a user prompt (Mp), a noise (En) introduced into a vehicle, and speech (Vs) contents, and
• wherein the speech (Vs) contents include speech data identified as beginning-of-speech (BOS) based on an input signal differing from a predetermined sound source pattern being detected and include speech data identified as end-of-speech (EOS) based on only the predetermined sound source pattern being detected.

A non-transitory computer-readable recording medium, which stores a computer program including computer-executable instructions configured to be executable by an apparatus for speech recognition including a processor, to cause the processor to execute:

• a function including changing a user prompt that induces utterance for speech recognition into a sound source and playing the sound source;
• a function including extracting a microphone detection signal when a speech of a user is received as a speech signal through a microphone;
• a function including removing the user prompt from the microphone detection signal;
• a function including recognizing a speech based on a value from which the user prompt is removed;
• a function including outputting a response related to the speech based on a result of recognizing the speech;
• a function including extracting a domain value (Rdn) and a speech recognition result value from the result of recognizing the speech;
• a function including acquiring a result value (Rt) output as text from the speech recognition result value;
• a function including extracting a keyword from the result value (Rt) and transmit the extracted keyword to a server;
• a function including acquiring a sound source (Rdn(x)) corresponding to the keyword extracted from the server;
• a function including mixing a sound source (Rdn(x)) corresponding to the keyword extracted from the server, the user prompt (Mp), and the result value (Rt);
• and
• a function including outputting a mixed result,
• wherein the function of acquiring a sound source (Rdn(x)) further comprises acquiring, from a database, a background sound corresponding to a domain value (Rdn) output from the speech recognition result,
• wherein the microphone detection signal includes a user prompt (Mp), a noise (En) introduced into a vehicle, and speech (Vs) contents, and
• wherein the speech (Vs) contents include speech data identified as beginning-of-speech (BOS) based on an input signal differing from a predetermined sound source pattern being detected and include speech data identified as end-of-speech (EOS) based on only the predetermined sound source pattern being detected.