Talk:Latency (audio)

message: The word "ideally" has been brought in via recent edit: "...local circuits should ideally have a latency of 1 millisecond or better." Ideal latency is zero, nonexistant. How else can the recent sentence be stated? Binksternet (talk) 18:38, 30 March 2008 (UTC)
thread_title: Ideally

message: When we talk about latency, we need to condition that by describing the component or system for which the latency is being specified or measured. The lead in this article probably needs to state as much. My recent edits to the lead attempted to enumerate all the potential sources of latency in a system. I included speed of sound as one potential source. User:Binksternet reverted that edit and has stated that this is not a latency contributer. Speed of sound comes into play if you consider propagation through air to be part of your system. With no explicit definition of the system, we have to assume that in some cases it is included and in some cases it isn't. In any case, I would argue that it is always a potential source of latency that should be given consideration. --Kvng (talk) 22:39, 27 June 2010 (UTC)
replies: text: Francis Rumsey writes that "latency is the delay incurred in executing audio operations between input and output of a system." I imagine if the system includes air, then the speed of sound is involved. I can see returning speed of sound to the lead. I deleted it earlier because my professional encounters with it are all electronic ones, not natural ones. Binksternet (talk) 05:19, 28 June 2010 (UTC)
replies: text: You do need to consider air as part of the audio system and a contributor to latency in cases such as sound reinforcement. --Kvng (talk) 15:30, 28 June 2010 (UTC)
replies: text: Certainly sound reinforcement must take speed of sound into consideration, and since that is my career, I am well aware of the physics. It's just that the word latency is not used by practitioners in my field to describe the delay in air, so I have resisted the word's extension that direction. The word latency is instead saved for electronic processes, mainly digital signal processing and format conversion; processes that apply to all listeners. The speed of sound applies differently to each listener depending on position. Again, I grant that the speed of sound is an undeniable part of a system that has air as a sound-carrying medium, so the loosest definition of latency will include the speed of sound. Binksternet (talk) 15:57, 28 June 2010 (UTC)
thread_title:  What are the reference points for latency measurements? 

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