The "Remote Cheerer powered by Sound UD" system is manufactured by Yamaha and broadcasts cheers, hoots and chants from stadium users' homes via the Internet, according to a press release.
Fans tap the buttons on an app to voice their feelings through speakers around the stadium, replacing the usual crowd noise.
Users can choose from which area of the stadium their noise is broadcast, and there are separate areas for each team to make the atmosphere as realistic as possible.
On May 13, Yamaha tested the system at the 50,000-seat Shizuoka ECOPA stadium in Japan, one of the largest in the country and home to the best soccer clubs Júbilo Iwata and Shimizu S-Pulse.

The test was the first time "Remote Cheerer" had been tested at a site, and Yamaha said it would continue to develop it.
"With the possibility of spectatorless games and incentive restrictions, I believe this system will encourage players on the field to make them feel like their fans and supporters are close by," said Hiromi Yanagihara of the Division Júbilo's business strategy. Press release.

Japanese sports teams are preparing to resume operations after Prime Minister Shinzo Abe lifted the country's state of emergency on Monday, a week earlier than expected.

Nippon Professional Baseball will start playing on July 19 and J.League football is expected to return a few weeks later, according to Reuters.
Other attempts to recreate the atmosphere of the stadium without supporters have encountered some problems.
South Korean football team, FC Seoul, was fined 100 million Korean won (approximately $ 81,000) after being accused of placing sex dolls in its stands to add to the atmosphere during a match behind closed doors.
Some figures held signs for a company that makes sex dolls, and fans pointed out that they looked like adult dolls rather than models.
FC Seoul apologized to the fans and told CNN that it would "humbly accept" the fine.
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