Infrared emitter

• US 20050094819A1
• Filed: 11/03/2003
• Published: 05/05/2005
• Est. Priority Date: 11/03/2003
• Status: Active Grant

• Current Assignee: Astro System Inc.
• Original Assignee: Astro System Inc.
• Inventors: Huang, Shu-Chun
• Granted Patent: US 6,931,136 B2
• Time in Patent Office: Days
• US Class Current: 381/1
• CPC Class Codes: H04B 10/1141 One-way transmission
• CPC Class Codes: H04R 2420/07 Applications of wireless loudspeakers or wireless microphones

Abstract

An infrared emitter comprises a preamplifier, an infrared RF emitter, an infrared channel controller and a photodiode emitting-medium. With the emitter, by switching between two channels with an infrared channel controller, and by the mode of arrangement of a plurality of infrared emitting diodes and two Darlington amplifying circuits on the parts in a photodiode emitting-medium, crosstalk disturbance during transmitting carrier waves to a wireless earphone is inhibited. The emitter is applied to industries of audio/video playing, car audio/video equipment and hi-fi equipment.

Claims

1. An infrared emitter, being used as an emitting source of a stereophonic amplifier with left sound channel and right sound channel, comprising:

a preamplifier of which one end is an input source of its left sound channel and right sound channel, and of which the other end amplifies and emits sounds of said left sound channel and right sound channel;

an infrared RF emitter including a channel A, a channel B and two set of mixers, said channel A includes a left sound channel of a first frequency and a right sound channel of a third frequency;

said channel B includes a left sound channel of a second frequency and a right sound channel of a fourth frequency;

one end of said infrared RF emitter is used to receive amplified sounds of said left sound channel and right sound channel of said preamplifier;

the other end is used to emit said sounds of said left sound channel and right sound channel wirelessly in a mode of FM carrier wave;

an infrared channel controller connecting with said infrared RF emitter for switching between said channel A and said channel B in said infrared RF emitter; and

a photodiode emitting-medium to receive and emit said sounds of the channel A and the channel B emitted from said infrared RF emitter, said photodiode emitting-medium includes two Darlington amplifying circuits and four diodes A, B, C and D, wherein said diodes A, B are infrared emitting diodes for left sound channel, and said diodes C, D are infrared emitting diodes for right sound channel;

one of said Darlington amplifying circuits is juxtaposed with said infrared emitting diodes A, C, the other of said Darlington amplifying circuits is juxtaposed with said infrared emitting diodes B, D; and

said infrared emitting diode A is of said first frequency, said infrared emitting diode B is of said third frequency, said infrared emitting diode C is of said second frequency, while said infrared emitting diode D is of said fourth frequency;

thereby, crosstalk disturbance during transmitting carrier waves is inhibited by switching between said channel A and said channel B with said infrared channel controller and by a mode of arrangement of said infrared emitting diodes on parts in said photodiode emitting-medium, as well as by using said two set of mixers to respectively control energy adjustment of said diodes A and B and energy adjustment of said diodes C and D.

2. The infrared emitter as claimed in claim 1, wherein said channel A and channel B of said infrared RF emitter are of FM.

3. The infrared emitter as claimed in claim 1, wherein said first frequency is 2.3 MHz, said second frequency is 3.2 MHz, said third frequency is 2.8 MHz, and said fourth frequency is 3.8 MHz.

4. The infrared emitter as claimed in claim 1, wherein said photodiode emitting-medium transmits said carrier waves to a wireless earphone.

5. The infrared emitter as claimed in claim 1, wherein said infrared channel controller switches between said channel A and said channel B in said infrared RF emitter by using an integrated circuit.