Speech can be described as noise that is modulated by low-frequency signals.

"Just press this, and a low-frequency signal on Excelsior's emergency band will go out from it.

"Sir, I can't get anything coherent on normal radio frequencies, but there is a strong, short-range low-frequency signal coming from the object."

What is needed, then, is a way to make these high-frequency signals into low-frequency signals.

Subwoofer A large speaker component that produces extremely low-frequency signals, usually below 180Hz.

Transformer sheath current filters are used in low-frequency signal lines, where a ground loop otherwise can not be prevented.

The capacitor exhibits reactance, and blocks low-frequency signals, causing them to go through the load instead.

Mr. Bunton hammered them into the ground as he explained that batteries send a low-frequency signal through the wire.

The air is full of power transmissions, odd miniature gravity wells, low-frequency signals, microwaves, you name it."

The magnetic amplifier was most prominent in power control and low-frequency signal applications from 1947 to about 1957, when the transistor began to supplant it.

"Uh, well, here-" The activity map told its own story: low-frequency signals, magnetic pulses really, of large amplitude.

Minutes later, an extremely low-frequency signal went out, and the submarine Admiral Lunin went to the surface to copy the full message.

"Low-frequency signals," she said.

Inductors block high-frequency signals and conduct low-frequency signals, while capacitors do the reverse.

"Radio waves below 22kHz: Nature's signals and strange emission at very low frequency" - a site specialising in low-frequency signals .

The United States also controls a navigational station that emits low-frequency signals that guide ships and aircraft in the Atlantic.

An immobilizer system uses induction circuitry in the vehicle's steering column to read a low-frequency signal emitted by the key-chain fob or key head.

The large capacitance of electrolytic capacitors makes them particularly suitable for passing or bypassing low-frequency signals and storing large amounts of energy.

A passive feed-through nuller uses a band-stop filter to reduce low-frequency signals before digital signal sampling, and this includes the bleed-through signal.

A passive low-pass filter removes the unwanted high-frequency components, i.e., smoothes the pulses out and recovers the desired low-frequency signal.

Capacitors are used in electrical circuits as energy-storage devices, as well as in electronic filters to differentiate between high-frequency and low-frequency signals.

The subtlest low-frequency signals hitting the cables distorted the coils by the slightest amount, and this altered the laser-light wavefronts' behavior by just enough to be recorded.

A low-pass filter is an electronic filter that passes low-frequency signals and attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency.

One problem with the circuit is that when the input is a low-frequency signal, the output amplitude becomes large and limiting may occur at the potentials of the bias supply.

"At any rate, it seemed reasonable that someone targeting the princes that accurately was doing it by means of a signal--a low-frequency signal, almost too faint to register.