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To reduce latency as much as possible, Jamulus makes use of compressed audio and the UDP protocol to transmit audio data. Total latency is composed of: network latency due to delays within the network - every 300km is responsible for at least 1 ms extra latency since the speed of light limits the data transport on internet.
When playing music remotely, musicians must reduce or eliminate the issue of audio latency in order to play in time together. While standard web conferencing software is designed to facilitate remote audio and video communication, it has too much latency for live musical performance.
Latency refers to a short period of delay (usually measured in milliseconds) between when an audio signal enters a system, and when it emerges.Potential contributors to latency in an audio system include analog-to-digital conversion, buffering, digital signal processing, transmission time, digital-to-analog conversion, and the speed of sound in the transmission medium.
Each layer that is bypassed means a reduction in latency (the delay between an application sending audio information and it being reproduced by the sound card, or input signals from the sound card being available to the application). In this way, ASIO offers a relatively simple way of accessing multiple audio inputs and outputs independently.
JamKazam is proprietary networked music performance software that enables real-time rehearsing, jamming and performing with musicians at remote locations, overcoming latency - the time lapse that occurs while (compressed) audio streams travel to and from each musician.
However, reducing audio latency has consequences: Reducing latency requires more processing by the CobraNet interface and may reduce channel capacity. Reducing latency places additional demands on network performance, and may not be possible in some network configurations if the forwarding delay is too high.
When the sound card uses a custom driver for use with the system supplied port class driver PortCls.sys or implements a mini-driver for use with the streaming class driver, applications can bypass the KMixer completely and use the kernel streaming interfaces instead to directly interact with audio driver and reduce latency. Windows 98 includes ...
Virtual Audio Cable is a software product based on WDM multimedia driver that allows a user to transfer audio streams from one application to another. Any application is able to send an audio stream to the input side of a "virtual cable" while a corresponding application can receive this stream from the output side.