MHz


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia.

MHz

Symbol for megahertz, i.e. 106 hertz.

mHz

(physics)

MHz

(physics)

MHz

MHz

(MegaHertZ) One million cycles per second. It is used to measure the transmission speed of electronic devices, including channels, buses and the computer's internal clock. A one-megahertz clock (1 MHz) means some number of bits (1, 4, 8, 16, 32 or 64) can be manipulated at least one million times per second. A two-gigahertz clock (2 GHz) means at least two billion times. The "at least" is because multiple operations often occur in one clock cycle.

Both megahertz (MHz) and gigahertz (GHz) are used to measure CPU speed. For example, a 1.6 GHz computer processes data internally (calculates, compares, copies) twice as fast as an 800 MHz machine.

Why Isn't It Faster?
A CPU in the new computer billed as two times faster than the old computer does not mean twice as much finished work gets done in the same time frame. Internal cache design, bus speed, disk speed and network speed all contribute to the computer's actual processing speed and performance (the overall throughput).

Users are often dismayed to find only incremental improvements after purchasing a so-called "faster" computer. In addition, newer versions of software are sometimes slower than previous versions, and a faster computer is often required just to maintain the same performance level as the old software. See MIPS, Hertz and space/time.

MHz and GHz Are the Heartbeat
When referencing CPU speed, the megahertz and gigahertz ratings are really the heartbeat of the computer, providing the raw, steady pulses that energize the circuits. If you know German, it is easy to remember. The word "Herz," pronounced "hayrtz," means heart. This was a coincidence, because in 1883, Heinrich Hertz identified electromagnetic waves.


Speed and Width
Just like a faster, wider highway handles more traffic, megahertz and gigahertz are the CPU's clock speed, and the number of bits (8, 16, 32, 64) are the width of the CPU's registers. The combination of the two determines the inherent processing speed of the CPU chip; however, there are many more factors after that. Clock speed and channel width also determine the transmission speed of pathways within a chip or from a chip to external devices (see PC data buses).
References in periodicals archive ?
Figure 4: Configuration of the 700 MHz band in Asia-Pacific (APT plan) 11
MHz Shortz Student Film Festival is produced by MHz NETWORKS.
The third bidder, 3 Austria, did not secure any spectrum in the 800 MHz spectrum and purchased 2 blocks of 900 MHz for a total of 10 MHz (it held 1.
UMTS 900 may help solve the 3G coverage issues in Europe, since providing full coverage at 2100 MHz is very expensive," said Dave Williams, group CTO for O2.
In addition to the achievements noted above, 50% of all Phase 1 incumbents for Waves 1 and 2 have moved to their new channel assignments within the 800 MHz band.
If all of these guidelines are met, and the TA has approved the submission for conformance with program guidelines (including that the costs are reasonable and prudent expenses directly related to the retuning of an 800 MHz system), Sprint Nextel will incorporate it into a PFA.
The trial service, planned for launch later this year, will deliver twice the channels and higher quality pictures than current mobile TV offerings by leveraging Hiwire's(TM) unmatched 12 MHz capacity of UHF spectrum and wireless knowledge, together with SES AMERICOM's robust satellites and distribution platforms, programmer relationships, and experience in IPTV delivery.
700 MHz allows the delivery of mobile broadcast TV at a fraction of the cost of higher frequencies and current delivery methods.
WASHINGTON -- Independent public broadcaster MHz NETWORKS announces the addition of the Maigret French detective series on its new national program service MHz WORLDVIEW.
Sprint Nextel (NYSE:S) and the Utah Communications Agency Network (UCAN) announced today the completion of a planning funding agreement (PFA) for 800 MHz reconfiguration.
The featured antenna selection includes mobile, base station and portable models for outdoor and indoor cellular data backhaul applications operating in frequencies from 806 MHz to 960 MHz and 1710 MHz to 2170 MHz.
com/reports/c26031) has announced the addition of USA and Canada 700 MHz Regulatory and Market Analysis to their offering