CVSD stands for Continuously Variable Slope Delta modulation, which is a digital audio encoding algorithm. CVSD is a low bit-rate audio codec that compresses audio data by reducing the bit-depth and sampling rate of the audio signal. CVSD works by approximating the slope of the analog audio waveform at each sample point and encoding the change in slope using a variable number of bits. The number of bits used for encoding is continuously adjusted based on the slope of the waveform, resulting in a variable bit rate that can range from 16 kbps to 32 kbps. CVSD is commonly used for voice recordings and is often found in telecommunication and military applications. It is not a widely used audio format for general consumer applications, as its low bit-rate encoding can result in lower audio quality compared to other digital audio formats. CVSD-encoded audio data can be stored in various file formats, such as WAV or AU, depending on the application. However, it is not a common or widely supported format for most media players and software.