These signals test the proper operation of the Windows 7 sound mixer resampler. The problem is limited to Windows 7 and Vista, and has been fixed in Windows 8 and later versions. Current (as of 2017) Windows 7 systems appear to have had this issue patched through updates. We reported this problem to Microsoft, but did not receive any news of a change in status. To enable HTML5 media playback in IE 9, this hotfix should be in the normal Windows Update process. This content may be at either 44.1 or 48 kHz sampling rates, so the problem is likely to occur for at least some of the content played, no matter whether the default rate is 44.1 or 48 kHz on the user's computer.Ī "request only" Windows hotfix was issued for this problem, but consumers won't recognize the problem or be able to find the hotfix. HTML5 media playback is important for enabling multi-channel AAC content delivery to the consumer. This is because the resampler for WaveOut was changed in Win7 to use linear interpolation, according to Microsoft. Windows 7 applications that use the WaveOut API will have poor audio quality on playback if the sample rate of the content is not the same as the default sample rate of the output device. Perhaps for this reason, or the fact it was already working code, IE 9 and Chrome apparently chose to use waveOut to play audio. This is supplied with Win 7, but in XP days, a user had to sometimes install DirectX seperately (usually with an application he or she installed) To use DirectSound, DirectX has to be installed on the PC. The primary methods or APIs to play audio in Windows 7 are: Output Method ![]() ![]() ![]() To explain this problem, some background on audio playback in Windows needs to be understood. This page details a historical problem that existed with Internet Explorer and Chrome in Windows 7.
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