heartbeat

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heartbeat

[′härt‚bēt]
(physiology)
Pulsation of the heart coincident with ventricular systole.

heartbeat

(networking)
The signal emitted by a Level 2 Ethernet transceiver at the end of every packet to show that the collision-detection circuit is still connected.

heartbeat

(2)
A periodic synchronisation signal used by software or hardware, such as a bus clock or a periodic interrupt.

heartbeat

(3)
The "natural" oscillation frequency of a computer's clock crystal, before frequency division down to the machine's clock rate.

heartbeat

(4)
A signal emitted at regular intervals by software to demonstrate that it is still alive. Sometimes hardware is designed to reboot the machine if it stops hearing a heartbeat. See also breath-of-life packet, watchdog.

heartbeat

(1) A periodic signal generated by hardware for activation and/or synchronization purposes. See MHz.

(2) A periodic signal generated by hardware or software to indicate that it is still running.
References in periodicals archive ?
As the scientists point out, this technology can do more than just exploit the human heartbeat to determine emotional state:
Schreck developed the idea to record patient's heartbeats after hearing a moving story about a family whose daughter passed away after an accident.
Mobile Heartbeat technology solutions consolidate clinical communications, including alarms and notifications, patient information and lab data, secure texting, voice and photography.
But every single beat of their heart makes one of their Heartbeats disappear.
By also recording the volunteers' heartbeat signals using electrodes, the timing of the heartbeat was used to trigger a bright flashing outline which was superimposed on the virtual body shown via the HMD.
In atrial fibrillation, the atria (upper chambers of the heart) beat in a disorganised way leading to an irregular heartbeat.
The discovery was made using a machine called a magnetocardiograph, which uses a strong magnetic field to record heartbeats.
Irregular heartbeats can indicate coronary heart disease or electrical heart disease, both of which can go undetected in their early stages and are signs of arrhythmia (abnormal or irregular heartbeats).
What to do: If you have irregular heartbeats, ask your doctor if you should take fish oil supplements.
You will need a watch with a second hand, a stool, and a pencil to record heartbeats per minute.
Herbal weight-loss drug Metabolife 356 can cause subtle changes in a person's heartbeat, the kind of alterations that sometimes lead to dangerous heart arrhythmias, researchers say.
The researchers found that there was a marked peak in irregular heartbeats on Mondays, followed by a midweek decline and a secondary peak on Fridays.