A quasi-peak audio level meter originally developed in the 1930s
A typical British quasi-PPM. Each division between '1' and '7' is exactly four decibels and '6' is the intended maximum level.
A peak programme meter (PPM) is an instrument used in professional audio that indicates the level of an audio signal.
Different kinds of PPM fall into broad categories:
True peak programme meter. This shows the peak level of the waveform no matter how brief its duration.
Quasi peak programme meter (QPPM). This only shows the true level of the peak if it exceeds a certain duration, typically a few milliseconds. On peaks of shorter duration, it indicates less than the true peak level. The extent of the shortfall is determined by the 'integration time'.
Sample peak programme meter (SPPM). This is a PPM for digital audio. It shows only peak sample values, not true waveform peaks (which may fall between samples and may be higher in amplitude).[1] It may have either a 'true' or a 'quasi' integration characteristic.
Over-sampling peak programme meter. This is a sample PPM that first oversamples the signal, typically by a factor of four, to alleviate the problems of a basic sample PPM.
In professional use, which requires consistent level measurements across an industry, audio level meters often comply with a formal standard. This ensures that all compliant meters indicate the same level for a given audio signal. The principal standard for PPMs is IEC 60268-10. It describes two different quasi-PPM designs that have roots in meters originally developed in the 1930s for the AM radio broadcasting networks of Germany (Type I) and the United Kingdom (Type II). The term Peak Programme Meter usually refers to these IEC-specified types and similar designs. Though originally designed for monitoring analogue audio signals, these PPMs are now also used with digital audio.
PPMs do not provide effective loudness monitoring. Newer types of meter do, and there is now a push within the broadcasting industry to move away from the traditional level meters in this article to two new types: loudness meters based on EBU Tech. 3341 and oversampling true PPMs. The former would be used to standardise broadcast loudness to −23 LUFS and the latter to prevent digital clipping.[2]
^Archimago (29 September 2018). "Archimago's Musings: MUSINGS / MEASUREMENTS: A look at Intersample Peaks and Overload Tolerance... (RME ADI-2 Pro FS, TEAC UD-501, Oppo UDP-205)". Archimago's Musings. Retrieved 2 October 2023. there is the potential for the ISP to be up +8dBFS
^"Loudness normalisation and permitted maximum level of audio signals" (PDF), EBU Rec. R 128, European Broadcasting Union, 30 August 2010
and 25 Related for: Peak programme meter information
categories: True peakprogrammemeter. This shows the peak level of the waveform no matter how brief its duration. Quasi peakprogrammemeter (QPPM). This...
monitoring Mixing console Noise pollution Nominal level PeakmeterPeakprogrammemeterProgramme level Chinn, H. A. "A New Standard Volume Indicator and...
A peakmeter is a type of measuring instrument that visually indicates the instantaneous level of an audio signal that is passing through it (a sound level...
Traditional methods of measuring signal levels, such as the peakprogrammemeter and VU meter, do not give the subjectively valid measure of loudness that...
Parts per million, ppm Carbon dioxide in Earth's atmosphere, CO2 ppm Peakprogrammemeter, measuring audio level PPM Star Catalogue of 378,910 stars Proton...
An electricity meter, electric meter, electrical meter, energy meter, or kilowatt-hour meter is a device that measures the amount of electric energy consumed...
periods or distortion of loud sounds. Programme level is often measured using a peakprogrammemeter or a VU meter. The level of an audio signal is among...
rangefinder camera Modula-3 (M3), a programming language M3, a British peakprogrammemeter standard used for measuring the volume of audio broadcasts m3, a...
cipher used by Digital Transmission Content Protection M6, a British peakprogrammemeter standard used for measuring the volume of audio broadcasts Meizu...
clarified loudness metering implementation and practices in 2016. Before the adoption of R 128, normalisation was based on the peak level of audio signals...
European Broadcasting Union standards. These devices use peakprogrammemeters instead of VU meters, which gives the reading a different meaning. "Mic level"...
many peaks, some more than 1,000 meters (3,250 feet) high. The three tallest and best-known peaks are Lotus Peak (Lianhua Feng, 1,864 m), Bright Peak (Guangming...
The Thirty Meter Telescope (TMT) is a planned extremely large telescope (ELT) that has become controversial due to its location on Mauna Kea, on the island...
ability to instruct individual meters to manage water heater and air conditioning consumption in order to prevent peaks in usage during the high consumption...
Travel Smart programme. Peak hours are defined as follows: 7:30–9:30 am and 5–8 pm, with different times for terminal stations. In London, Peak Day Travelcards...
is the highest peak on the Entoto Mountains, which overlooks the city of Addis Ababa, the capital of Ethiopia. It reaches 3,200 meters above sea level...
with a recorded peak load of around 2115 MW as of June 2022. The company was the first in the country to initiate an Automated Metering Infrastructure...
fast-delivery mass meteringprogramme (Mobile MAP Initiative) in Nigeria, resulting in the delivery of over 80,832 electricity meters and also the purchase...
Pakistan's high peaks are located in the Karakoram range, the highest of which is K2 8611 meter long (8,611 metres (28,251 ft)), the second-highest peak on earth...
generation to provide cheap off-peak electricity during the night. Houses using the Economy 7 tariff require a special electricity meter which provides two different...
to measure audio programme loudness and true-peak audio level". International Telecommunication Union. Retrieved 2018-07-27. Meters that ... use an oversampled...
Philippines risk their lives every day mining gold. Children work in unstable 25-meter-deep pits that could collapse at any moment. They mine gold underwater,...
"Episode 2" 23 October 2018 (2018-10-23) 734,000 A woman falls off a 15-meter cliff. A rookie paramedic faces a confronting case. A catastrophic crash...
Global Information