Auditorium simulator and the like employing different pinna filters for headphone listening
Headphone unit incorporating microphones for binaural recording
Binaural multi-channel stereophony
Audio signal translation for loudspeaker and headphone sound reproduction
Dimensional sound producing apparatus and method
Audio-digital processing system for demultiplexing stereophonic/quadriphonic input audio signals into 4-to-72 output audio signals
Simulated stereo from a monaural source sound reproduction system
ApplicationNo. 787705 filed on 01/24/1997
US Classes:381/17, Pseudo stereophonic381/18Pseudo quadrasonic
ExaminersPrimary: Lee, Ping W.
Attorney, Agent or Firm
Foreign Patent References
International ClassH04R 005/00
AbstractThe system and method of the present invention provides surround sound effects through a two channel system. In one embodiment, the first channel is connected to one speaker (e.g., the right speaker) of a headset and the second channel is connected to the other speaker (e.g., the left speaker) of the headset. Thus, surround sound effects, including providing effects to distinguish front and rear sound sources, are provided through headsets which isolate the sound provided to right ear and the left ear of the listener. Alternately, the signals are output to a two speaker system, enabling surround sound effects to be output through home stereo systems not necessarily configured specifically for surround sound. Modified head related transfer functions (HRTF) are applied to each rear sound signal. The modified HRTF for each rear signal is generated by removing the head related transfer function corresponding to the front center signal from the HRTF corresponding to the rear sound signal. This provides the audible effect of distinguishing more clearly sounds originating in front of the listener or to the rear of the listener while not limiting the perceived bandwidth of the signal.