Deepfake Audio Detection System Based on MFCC Feature Extraction

The Deepfake Audio Detection System Based on MFCC Feature Extraction is a machine learning detection solution for synthetic audio. It primarily adopts MFCC feature extraction technology and combines multiple classification models (such as SVM, Random Forest, XGBoost, Neural Networks, etc.), covering the complete workflow of audio preprocessing, feature engineering, model training, and evaluation, aiming to address the security threats posed by deepfake audio.

With the rapid development of generative AI technology, the quality of deepfake audio is improving day by day, making it difficult for human ears to distinguish between real and fake. Although it has legitimate applications (such as dubbing, auxiliary communication), it may be maliciously used for fraud, identity forgery, and information manipulation. Therefore, developing a reliable detection system has important practical significance.

Core Technology: MFCC Feature Extraction

MFCC (Mel-Frequency Cepstral Coefficients) simulates the human ear's perception of different frequencies. The extraction process includes:

1. Pre-emphasis: Enhance high-frequency components
2. Framing and windowing: Split into short-time frames and apply Hamming window
3. FFT: Convert time domain to frequency domain
4. Mel filter bank: Map to Mel scale
5. Logarithm operation and DCT: Compress dynamic range and decorrelate

System Architecture

The system uses a machine learning pipeline architecture, including four stages:

1. Data preprocessing: Standardize sample rate, remove silence and noise, length normalization
2. Feature engineering: Basic MFCC coefficients + delta features, energy features, time statistics
3. Multi-model training: SVM, Random Forest, XGBoost/LightGBM, Neural Networks
4. Model evaluation: Cross-validation with metrics including accuracy, precision/recall, F1, AUC-ROC, and confusion matrix

The project uses multiple datasets for training and testing:

• Real audio datasets: LibriSpeech, VoxCeleb, etc.
• Synthetic audio datasets: Samples generated by TTS/VC systems
• ASVspoof series: Standard evaluation datasets for speech spoofing detection The generalization ability of the model across different scenarios and synthesis techniques is verified through multiple datasets.

Challenges and Corresponding Solutions

1. Rapid evolution of synthesis technology: New TTS models (VITS, Bark, etc.) generate high-quality audio, leading to failure of traditional features Solution: Introduce wav2vec2.0 embeddings, transfer learning, and continuously update training data
2. Cross-dataset generalization: Model performance varies significantly across different datasets Solution: Data augmentation (noise/speed/pitch variation), domain adaptation, ensemble learning
3. Real-time requirement: Low-latency detection is needed Solution: Optimize feature extraction, model lightweighting (pruning/quantization/distillation), edge deployment (ONNX/TensorRT acceleration)

Application Scenarios

1. Financial security: Identity verification for bank call center services
2. Media review: Authenticity verification of news interview recordings
3. Social platforms: Automatic tagging/filtering of suspicious synthetic audio
4. Judicial forensics: Technical identification of audio evidence

Deployment Recommendations

• Layer 1: Lightweight model for fast screening
• Layer 2: Complex model for fine-grained detection
• Layer 3: Manual review for edge cases

Future Development Directions

• End-to-end deep learning: Learn discriminative features directly from raw waveforms
• Multi-modal fusion: Combine audio, video, and text for comprehensive judgment
• Active defense: Embed inaudible watermarks/signatures during generation
• Federated learning: Collaborative training with privacy protection

Conclusion

Deepfake audio detection is an important research direction in AI security. This project provides a complete solution through MFCC feature extraction and multi-model integration. Facing the challenge of iterative synthesis technology, it is necessary to continuously optimize feature engineering, model architecture, and multi-strategy fusion to build a reliable defense system.