A/C Circuit for combining an automobile radio speaker with speakers of an automobile stereophonic system

• US 4,164,625 A
• Filed: 01/06/1978
• Issued: 08/14/1979
• Est. Priority Date: 02/07/1977
• Status: Expired due to Term

• Current Assignee: Harutoshi Igeta
• Original Assignee: Harutoshi Igeta
• Inventors: Igeta, Harutoshi
• Primary Examiner(s): Cooper, William C.
• Application Number:
  US05/867,379
• Time in Patent Office: 585 Days
• Field of Search: 179/1 SW, 179/1 VE
• US Class Current: 381/28
• CPC Class Codes: H04S 1/002 Non-adaptive circuits, e.g. manually adjustable or static, for enhancing the sound image or the spatial distribution control circuits for electronic adaptation of the sound field H04S7/30

Abstract

A circuit arrangement for combining a car radio speaker into the circuit of a car stereo system having left and right speakers; to accomplish this changeover switches, control devices for sound volume, variable resistance apparatus, damping circuits on the left and right sides, amplifiers, and illuminating members are additionally provided for carrying out the changeover between speakers as well as to control the sound quality and volume.

Claims

1. Apparatus for selectively combining the speaker means of a car radio with the left and right speaker means of a car stereo amplifier, said apparatus comprising:

a changeover switch connected to a power source, to said car radio, and to said car stereo amplifier for selectively connecting in a first position said car stereo amplifier to said power source and in a second position said car radio to said power source;

a changeover relay having a coil portion connected for energization by said power source in said second position of said changeover switch, said relay having first, second and third double-throw switch portions, wherein the arms of said switches are mechanically interconnected for mutual actuation when said coil portion is energized;

a first output damping circuit including first and second ganged rotary switches each having wiper arms and a number of contacts, the wiper arms of said first and second rotary switches being connected to the arm of said second switch portion of said relay, the central contact of said first rotary switch being connected to an input of said left speaker means, the contacts to a first side of said central contact being interconnected by resistors and the contacts to the other side being connected together, the central contact of said second rotary switch being connected to an input of said car radio speaker means, the contacts to said first side of said central contact being connected together and the contacts to the other side of the central contact being interconnected by resistors;

a second output damping circuit including first and second ganged rotary switches each having wiper arms and a number of contacts, the wiper arms of said first and second rotary switches being connected to the arm of said third switch portion of said changeover relay, the central contact of said first of said rotary switches being connected to one input of said right speaker means, the contacts on a first side of said central contact being interconnected by resistors and the contacts on the other side of said central contact being connected together, the central contact of said second rotary switch being connected to the normally closed contact of said first switch portion of said changeover relay, the contacts on said first side of said central contact being connected together and the contacts on the other side of said central contact being interconnected with resistors;

said car stereo amplifier having a left channel output connected to the normally closed contact of said second switch portion of said relay, a right channel output connected to the normally closed contact of said third switch portion of said relay, and a common output connected to said left and right speaker means;

said car radio amplifier having a first output lead connected to the normally open contact of said first switch portion of said relay and a second output lead connected to both normally open contacts of said second and third switch portions of said relay; and

said car radio speaker means having an input connected to the arm of said first switch portion of said relay, whereby in said first position of said changeover switch said car stereo amplifier is energized and is connected to said left and right speaker means and to said car radio speaker means through said first and second damping circuits such that as said wiper arms are moved to said first side of said central contacts the resistors are placed in the circuits of said left and said right speakers and said car radio speaker is directly connected to said car stereo amplifier, and when said wiper arms are moved to the other side of said central contacts said resistors are placed in the circuit of said car radio speaker means, and whereby in said second position of said changeover switch said relay coil portion is energized and the arms of said first, second, and third switch portions are actuated and said car radio is energized and is connected to said left and right speaker means and to said car radio speaker through said first and second damping circuits.