MATLAB Sample for Multiple Speech Processing including Time-Scaling and Pitch-Shifting

This is a MATLAB sample program designed to perform multiple processing operations on speech signals, including time-scaling and pitch-shifting. The code below provides detailed implementation instructions for these audio processing techniques. To begin, we need to load the audio file using MATLAB's built-in audio handling functions: [y, fs] = audioread('path_to_audio_file'); For time-scaling (changing playback speed without affecting pitch), we use the resample function which employs an anti-aliasing filter to maintain audio quality: y_speed = resample(y, new_sampling_rate, fs); For pitch-shifting (altering frequency while maintaining duration), the implementation typically involves phase vocoding or PSOLA algorithms: y_pitch = pitchshift(y, pitch_factor); Additional processing such as noise reduction using digital filters (e.g., Wiener filter or spectral subtraction) can be applied: y_processed = denoise(y, filter_parameters); Finally, save the processed audio using appropriate parameters: audiowrite('output_audio_path', y_processed, new_sampling_rate); By utilizing this sample program, you can perform various speech processing operations according to your requirements and adjust parameters based on specific applications. The code demonstrates fundamental digital signal processing concepts including resampling algorithms, frequency domain transformations for pitch modification, and filter design for noise reduction. We hope this proves helpful for your audio processing projects!