APPARATUS FOR FORGERY DETECTION OF AUDIO FILE

• Main Authors: KIM, KYUNG WHA, YU, HA JIN, BAEK, ROCK SEON
• Format: Patent
• Language: English; Korean
• Published: 10.04.2014
• Subjects: ACOUSTICS; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

An embodiment of the present invention relates to an apparatus which extracts feature data from an audio file and automatically detects a potentially forged segment using a recording path estimation result based on the feature data. The detection method of the apparatus includes the steps of: receiving an audio signal; dividing the audio signal in frame units of a predetermined length and generating multiple frame unit signals; extracting one of a mel-frequency cepstral Coefficient (MFCC) value, a linear prediction coding (LPC) value, and a perceptual linear prediction (PLP) value of each of the frame unit signals as the feature data; setting a model most similar to the feature data among multiple audio signal recording path models as the estimated recording path of each frame unit signal; and setting the most frequently estimated recording path among the estimated recording paths as the default recording path and detects an unusual segment which is suspected to be forged. [Reference numerals] (AA) Start; (BB) End; (S210) Step of receiving an audio signal; (S220) Step of dividing an audio signal in frame units of a predetermined length and generating frame unit signals; (S230) Step of extracting feature data from each frame unit signal; (S240) Step of estimating each recording path of the frame unit signal and generating an estimated recording path; (S250) Step of detecting an unusual segment based on the estimated recording path