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Patient monitor delay

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hap2001:
Hi.

I'm not professional, I just played with a few patient monitors by Philips, and all of them have several seconds of delay, from the signal change to the data shown on screen.
(I'm not talking about the alarm delay - from the data shown to alarm triggering - I understand that is deliberately done to reduce false alarm.)

Do you guys know whether the display delay is on purpose (please explain), or it's a hardware limitation?
Any brand/model that do not have such delay?

Thanks.

Benta:
I don't think it's intended. But there's a heck of a lot of signal processing going on, and even with fast DSPs there'll be some delay.

SiliconWizard:

--- Quote from: hap2001 on June 22, 2023, 01:56:48 pm ---I'm not professional, I just played with a few patient monitors by Philips, and all of them have several seconds of delay, from the signal change to the data shown on screen.
(I'm not talking about the alarm delay - from the data shown to alarm triggering - I understand that is deliberately done to reduce false alarm.)

Do you guys know whether the display delay is on purpose (please explain), or it's a hardware limitation?
Any brand/model that do not have such delay?

--- End quote ---

What kind of hardware monitor? I suppose you are talking about the typical ones measuring heart rate, showing a basic "real-time" ECG, blood pressure and O2 Sat?

You probably need to consider the time scale of these events to understand why the latency is in the order of seconds. The cardiac & respiratory periods are in the order of a second and you need several periods to make any relevant measurement.

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