Host Broadcast Services, the company that provides the broadcast feed for the World Cup, says it has doubled its audio filters to reduce the constant blaring buzz of vuvuzelas.TV viewers around the globe have complained that the sound from the plastic horns is stinging their ears.
"Despite HBS' core philosophy, which is to provide 'realistic' host broadcast coverage reflecting the ambiance in the stadiums, additional audio filtering has been implemented," the daily newsletter given to rights holders said.
The filters will also minimise other crowd noise in the stadiums, such as chants and cheers. HBS said it had increased the level in the ball microphones to provide some balance.
Several broadcasters have already taken their own measures to reduce the drone. French broadcaster TF1 changed its microphones after the opening match between Mexico and host South Africa, replacing them with microphones commentators hold close to their mouths that better filter sound.
The BBC, which had received 545 complaints from viewers as of Tuesday morning, said it was considering giving viewers the option of muting ambient noise while maintaining game commentary through its "red button" digital service. Viewers would push a red button on their remote control to receive the quieter broadcast on a separate channel.
"We have already taken steps to minimise the noise and are continuing to monitor the situation," the BBC said in a statement.
"If the vuvuzela continues to impact on audience enjoyment, we will look at what other options we can take to reduce the volume further."
SBS, the official broadcaster of the World Cup games in Australia, said there was "little else" the station could do "short of us broadcasting away from the stadium".
"SBS has taken all measures possible to minimise the impact of the noise from vevuzelas. The noise is affecting broadcasters all over the globe," an SBS spokeswoman said.
"Short of us broadcasting away from the stadium, where there would be no background noise at all - no goal reaction, no atmosphere, no kick of the ball - there is little else we - or any other broadcaster - can do."
The noise of the vuvuzelas has been the talk of the World Cup, so much so that British bookmaker William Hill is now taking bets on whether the horns will be banned at Premier League stadiums next season.
"The vuvuzela certainly polarises opinion, and we suspect that individual clubs will want to put a rule in place to enable them to ban them should they threaten to become widespread," William Hill spokesman Graham Sharpe said.
William Hill is also taking bets that the vuvuzelas will be banned by the end of the World Cup. But FIFA president Sepp Blatter has strongly backed the use of the horns since they were introduced to the wider football world at the Confederations Cup in South Africa last year, and he said again on Monday they're here to stay. The vuvuzelas are something African, and Blatter said he was not about to ban the music traditions of fans in their own country.
Several players said the din of the horns was having an impact on the field. Netherlands striker Robin van Persie avoided a second yellow card - and a ban from the next game - by blaming the vuvuzelas for failing to hear an offside whistle. Argentina striker Carlos Tevez said the din of vuvuzelas made it hard for players to communicate with each other on the field.
"Those sirens or trumpets - I don't know what they are - make it very difficult to speak on the field," Tevez said after Argentina's training session on Tuesday at the University of Pretoria. "You have to shout and sometimes you run out of breath, you get a bit more tired. They are extremely bothersome."
But Van Persie said he did not want to see vuvuzelas banned.
"I think we have to respect it, because we are in South Africa, and we need to respect where we are," the Dutchman said. "This is their tradition. This belongs to them."
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