QRM.guru has been developed to assist Radio Amateurs in dealing with RF noise and interference. This is an educational and reference resource. The information provided on these pages is not unique or regarded as a new discovery. QRM.guru and the developers provide the information on these pages in good faith and obtain no monetary benefit for their efforts. QRM.guru is a volunteer powered resource.
Most people find this website because they are disturbed by an unusual unidentified low-frequency sound that scientists now call the Worldwide Hum. The classic description is that The Hum sounds like a car or truck engine idling outside your home or down the block. Some people describe it as a low rumbling or droning sound. It is typically perceived louder at night than during the day, and louder indoors than outdoors. The sound can usually be masked by background noise, such as a fan or keeping the radio on. We estimate that 2-4% of the global population can experience this phenomenon under certain conditions.
The typical characteristics of the World Hum are that sufferers hear it wherever they go, and that other people in the same place and time cannot hear it. This may be a type of otoacoustic phenomenon generated internally in the brain and auditory organs, through mechanisms which are not yet fully understood, but for which this project tries to find answers and possible remedies.
The entire dataset can be downloaded as a CSV file. There is also a project whitepaper for people to gather more data for analysis.
A site that only plays background noise from coffee shops and restaurants around the world to help you concentrate.
A site which plays recordings made in forests around the world. Very relaxing.
EmissionControl2 (EC2) is a standalone interactive real-time application for granular synthesis and sound file granulation. Make new sounds to use in synthesizers, samplers, or other fx-related stuff.
GreyNoise is a system that collects and analyzes data on Internet-wide scanners. GreyNoise collects data on benign scanners such as Shodan.io, as well as malicious actors like SSH and telnet worms.
The data is collected by a network of sensors deployed around the Internet in various datacenters, cloud providers, and regions.
Simply Noise is an online white, pink, and brown noise generator. Good for sleep, deadening noise, concentration, and stress. There are also apps in the iProduct and Android stores that do the same thing (both $0.99us).
An online noise and sound generator. Has multiple categories and dozens of different sounds, from thunder to to rain to singing bowls, the wind blowing through a canyon, surf sounds, wind sounds in different locales, different voices, and different brainwaves. You can stack up to five of them in a sequence. You can download them, too! Updated periodically, so check back once in a while. The iOS and Android apps are out, too.
FOSS software that uses an RTL-SDR radio receiver as a cryptographic entropy generator. Pulls samples of RF noise, processes them, and seeds an RNG with it. Written in C.