![]() ASIO drivers provide an audio application direct communication with the hardware, bypassing the operating system. MME drivers allow the operating system itself to act as a go-between and are generally slower as they rely upon higher buffer sizes and have to pass through multiple processes on the computer before being sent to the audio device. Apple Mac systems use CoreAudio almost exclusively which provides for low buffer sizes and the ability to mix and match different devices (called an Aggregate Device.) MME and ASIO are mostly Windows-exclusive driver models, and provide different methods of communicating between application and device. When recording while monitoring, the overall perceived latency can often be double the device buffer size.ĪSIO, MME, CoreAudio: These are audio driver models, which simply specify the manner in which an audio application and audio device communicate. It also refers to the other direction, where the output audio signal is sent from the audio application to the audio device for playback. Latency: The time span that occurs between providing an input signal into an audio device (through a microphone, keyboard, guitar input, etc) and when each buffers-worth of that signal is provided to the audio application. Buffers are typically measured in Samples (command values being 64, 128, 512, 1024, 2048.) or milliseconds which is simply a calculation based on the device sample rate and buffer size. An audio device will collect a buffers-worth of samples before feeding it to the audio device when recording. An audio application will collect a buffers-worth of samples before feeding it to the audio device for playback. Typically, the audio device measures the incoming signal 44,100 or 48,000 times every second.īuffer Size: The "bucket" where samples are placed before being passed to the destination. Sample: The value of each individual bit of audio digitized by the audio device. ![]() Monitoring: listening to existing audio while simultaneously recording new audio. I'm going to provide a brief overview of the different types of devices, how they interface with the computer and Audition, and steps to maximize performance and minimize the latency inherent in computer audio. A common question that comes up in these forums over and over has to do with recording latency, audio drivers, and device formats. ![]()
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