Which of the following is NOT a commonly used audio signal processing technique?a.Encryptionb.Compressionc.Equalizationd.Delay

To determine which option is NOT a commonly used audio signal processing technique, let's briefly review each option provided:

1. Encryption: This is a process used to secure data by converting it into a coded format that can only be read by authorized parties. While encryption can be relevant in the context of audio, it is not specifically a signal processing technique.

2. Compression: This technique is widely used in audio processing to reduce the size of audio files or to manipulate the dynamic range of signals.

3. Equalization: This is a fundamental audio processing technique that adjusts the balance between frequency components. It allows for enhancement or correction of the audio signal.

4. Delay: This technique involves delaying the audio signal for a specific period and is often used in effects processing to create echoes or to synchronize audio signals.

Final Answer

a. Encryption is NOT a commonly used audio signal processing technique.