×

TWO-CHANNEL, FOUR-COMPONENT STEREOPHONIC SYSTEM

  • US 3,697,692 A
  • Filed: 06/10/1971
  • Issued: 10/10/1972
  • Est. Priority Date: 06/10/1971
  • Status: Expired due to Term
First Claim
Patent Images

1. An audio reproduction system driving four speakers in response to only two left and right stereophonic audio power amplifiers, said amplifiers being left and right amplifiers and the audio signals provided by said amplifiers respectively having audio signal levels denominated as L and R, a different one of said speakers being positioned approximately at each of the four corners of a quadrilateral area, which may be occupied by a listener, said speakers directing sound towards the interior of the area, wherein first and second ones of the speakers are respectively positioned in the left and right rear corners of the area behind the listener and third and fourth ones of the speakers are positioned in the left and right front corners of the area facing the listener, each of said speakers including a signal and a ground terminal, comprising means responsive to said left amplifier for applying a first audio signal to said signal terminals of the front left and rear left speakers, means responsive to the other one of said amplifiers for applying a second audio signal to said signal terminals of the front right and rear right speakers, means grounding the second terminals of the two front speakers, and passive impedance network commonly in series with said rear speakers connecting the ground terminals of the two rear speakers to ground, the impedance of said impedance network having a substantiAl value capable of audibly modifying the relative amplitudes of the responses of the rear speakers relative each other.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×