In virtual sound reproduction with headphones, a well-known problem is that using nonindividualized head-related transfer functions(HRTFs) yields front-back confusion in sound image localization. To overcome this problem, a swing sound image method has already been reported that significantly reduces the front-back confusion in single sound source reproduction. In order to apply the method to two-channel stereo sound reproduction, this paper describes two methods of producing the swing sound image; the twist and compand methods. Three listening tests are used to assess their localization validity. The results show that, with suitable parameters, these methods can reduce front-back confusion.
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