Patent ID: 7333622
Filing Date: 2008-02-19
Classification: H04R,H04S

Abstract:
1. A sound reproduction apparatus, comprising: (a) a signal processing unit; (b) said signal processing unit having an input for connection to a head tracking device; (c) said signal processing unit configured to receive input signals representative of output signals of a plurality of microphones positioned to sample a sound field at points representing possible locations of a listener's ear if said listener's head were positioned in said sound field at the location of said microphones; (d) said signal processing unit having an output for presenting a signal to an audio output device in response to orientation of said listener's head as indicated by said head tracking device; (e) said signal processing unit configured to separate low-frequency components of said input signals from high-frequency components of said input signals based on a cutoff frequency that is a function of the distance between the microphones; (f) said signal processing unit configured to interpolate the low-frequency components of said input signals and produce a low-frequency signal representing the low-frequency components associated with the location of the listener's ear; (g) said signal processing unit configured to produce a complementary high-frequency signal for the listener's ear by processing said high-frequency components as a function of the location of the listener's ear; (h) said signal processing unit configured to form a composite signal by adding said low-frequency signal to said high-frequency signal; (l) wherein said composite signal is presented to said audio output device.