Lena Torres
The Portable People Meter (PPM), also known as the Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio or television stations. The PPM is worn like a pager and detects hidden audio tones within a station or network's audio stream, logging each time it finds a signal. The original concept for the PPM can be traced back to a brainstorming session at Arbitron in November 1988, where there were concerns that the technology then in use would become obsolete with the move from analog video to high-definition digital television. Dr. Gerald Cohen proposed embedding an identifying signal in the audio and later decoding it, arguing that audio was less likely to undergo as drastic a change as video.
| Characteristics | Values |
|---|---|
| What is the Nielsen Meter? | A system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio stations and television stations. |
| How does it work? | It detects hidden audio tones within a station or network's audio stream, logging each time it finds a signal. |
| What does it detect? | Inaudible signals found in radio broadcasts. |
| What does it not detect? | Conversations. |
| Who wears it? | Each panelist in the household. |
| When do you wear it? | All the time except when sleeping. |
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What You'll Learn
The Portable People Meter (PPM)
The original concept for the PPM can be traced back to a brainstorming session at Arbitron in November 1988. With the forthcoming move from analog video to high-definition digital television, engineers were concerned that the technology then in use would become obsolete. Dr. Gerald Cohen proposed embedding an identifying signal in the audio and later decoding it. He argued that audio was less likely to undergo drastic changes in content and technology, so any technology developed would be future-proof.
Dr. Cohen's idea lay dormant until 1992 when it was revisited by Dr. Richard Schlunt and Dr. Patrick Nunally, who presented a new variation of the idea to Arbitron. They proposed to selectively embed a code into the frequency spectrum of the baseband audio stream and use digital signal processing in a small wearable device to recover the embedded code buried in what a person watches or hears.
The PPM system consists of an encoder that inserts the tones subliminally into a station's or broadcast network's airchain via psychoacoustic masking. A monitor checks that the encoder is working properly. Each panelist carries a wearable Portable People Meter and has a base station for their PPM, where they place it overnight to recharge the battery. The base station also serves to transmit panelists' listening data from the PPM to the collection point.
In 2021, Nielsen introduced the next-generation PPM Wearables, placing approximately 3,000 new devices with a subset of its nearly 60,000 active PPM panelists. These new wearables are part of Nielsen's ongoing commitment to innovation, enhancing the quality of its panels and enabling cross-platform measurement. The new PPM Wearables have been through rigorous tests and performed very well in each phase.
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How the PPM encoder responds to audio
The Portable People Meter (PPM), also known as the Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio and television stations, including cable television. The PPM is worn like a pager and detects hidden audio tones within a station or network's audio stream, logging each time it finds a signal.
The PPM encoder responds to audio by inserting hidden audio tones into a station's broadcast. These tones are then detected by the PPM device, which logs each time it finds a signal. The PPM encoder uses a psychoacoustic audio masking model to combine digital data, called a "watermark," with the actual audio signal. This allows the PPM encoder to insert data about the program audio into the audio itself, which can then be received by a monitoring device, such as the PPM.
The PPM encoder responds well to audio sources that have a high average level of program audio. This provides the most opportunity for the PPM encoder to inject its data while ensuring that the program audio masks the data. The PPM encoder can also be used with music stations, but it may not accomplish much by adding anything due to the longer "duty cycle" of audio.
To ensure that the PPM encoder functions properly, it is important to pay attention to headroom when using an analog encoder to prevent clipping the audio. Additionally, it is necessary to determine if the analog encoder signal path introduces overshoot and/or tilt into the processed audio. The digital PPM encoder is generally preferred as it does not compromise the program audio waveform fidelity and has sufficient headroom.
The PPM encoder is an important component of the Nielsen Meter system, allowing for the measurement of audience exposure to radio and television stations. By responding to audio and inserting hidden audio tones, the PPM encoder enables the collection of data about what stations are being listened to or watched.
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The PPM wristband and location tracking
The Portable People Meter (PPM), also known as the Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio and television stations, including cable television. The PPM is a small, pager-like device that detects hidden audio tones within a station or network's audio stream, logging each time it finds a signal.
The PPM is worn by each panel member, who place it on a base station overnight to recharge the battery. The original concept for the PPM was conceived in 1988, amidst concerns over the forthcoming switch from analogue video to high-definition digital television, which threatened to render existing technology obsolete. Dr Gerald Cohen proposed embedding an identifying signal in the audio, arguing that audio was less likely to change than video, meaning the technology would have a longer lifespan.
The PPM works by inserting hidden audio tones subliminally into a station's broadcast network via psychoacoustic masking. A monitor then checks that the encoder is working properly. The PPM is capable of responding to different audio sources, such as "white noise", which can be added to the program audio going into the PPM to help non-music formats.
The PPM does not track location, but it does have motion detection capabilities. This means that it can detect when a wearer is moving, but not their specific location.
In terms of privacy, Nielsen states that information from a participant's home is held strictly confidential and will not be used to advertise, promote, or sell goods and services directly to them. They do, however, collect information about who watches and listens to content, such as music and TV shows, to generate ratings. These ratings indicate the percentage of a specific population that saw, heard, or engaged with a piece of content or advertisement.
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The PPM's ability to pick up audio signals from other TVs
The Portable People Meter (PPM), also known as the Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio or television stations. The PPM is a small wearable device that detects hidden audio tones within a station or network's audio stream, logging each time it finds a signal.
The PPM works by selectively embedding a code into the frequency spectrum of the baseband audio stream. This embedded code is then detected and decoded by the PPM device. The principle of psychoacoustics is employed to mask the embedded code signal, making it inaudible to human ears.
The PPM's ability to detect hidden audio tones is not limited to television broadcasts. It can also detect inaudible signals found in radio broadcasts, providing a comprehensive understanding of an individual's media consumption habits.
While the PPM's primary function is to measure audio signals, it is important to note that it does have additional capabilities, such as motion detection, that enhance its functionality and provide valuable data for media research.
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The PPM's use of psychoacoustics
The Portable People Meter (PPM), also known as the Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio and television stations. The PPM is worn like a pager and detects hidden audio tones within a station's audio stream, logging each time it finds a signal.
The PPM's encoder inserts these tones subliminally into a station's broadcast network via psychoacoustic masking. Psychoacoustics is the scientific study of the perception of sound by the human auditory system. It is an interdisciplinary field that includes psychology, acoustics, electronic engineering, physics, biology, physiology, and computer science.
Psychoacoustics is based heavily on human anatomy, especially the ear's limitations in perceiving sound. For example, a compression algorithm can assign a lower priority to sounds outside the range of human hearing. By shifting bits towards the important components, the algorithm ensures that the sounds a listener is most likely to perceive are accurately represented.
Psychoacoustics also includes the study of topics such as music psychology and music therapy. For example, musicians and artists create new auditory experiences by masking unwanted frequencies of instruments, causing other frequencies to be enhanced. Psychoacoustic analysis is routinely used to compress music files to a much smaller size with minimal loss in perceived quality. This type of compression is a feature of nearly all modern lossy audio compression formats, including MP3, Opus, and AAC.
In the case of the PPM, psychoacoustic masking is used to embed the signal into a station's broadcast. However, this technique has been criticised for potentially causing the signal to get lost in certain styles of music, thus artificially lowering the radio station's listenership.
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Frequently asked questions
The Portable People Meter (PPM), also known as the Nielsen Meter, is a system developed by Arbitron (now Nielsen Audio) to measure how many people are exposed to individual radio stations and television stations.
The PPM is worn like a pager and detects hidden audio tones within a station or network's audio stream, logging each time it finds a signal.
Every program emits an audio signal every two seconds (inaudible to human ears). The Nielsen devices pick up that signal for however long the person is watching.
While it is not confirmed, some users have expressed concerns about the meter's ability to track location.
