Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Reexamination Certificate
1997-06-11
2001-03-13
Cuchlinski, Jr., William A. (Department: 3661)
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
C345S215000, C345S014000
Reexamination Certificate
active
06201537
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application entitled Sounds Control Circuit and Method Using Microcomputer earlier filed in the Korean Industrial Property Office on Jun. 11, 1996, and there duly assigned Serial No. 96-20848, and on May 16, 1997, and there duly assigned Serial No. 97-18833 by that Office.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display device with a sound control function aside from a general function of the display device. Specifically, this invention is a sound control circuit and method using a microcomputer in conjunction with the display device.
2. Discussion of Related Art
Today, computers are rapidly changing the work environment; the very circumstances for application of a computer are being developed. For example, various usages of multi-media are affecting our daily lives. As the various kinds of sound software are utilized in a multi-media computer, display devices corresponding to the multi-media which contains a sound amplifier and a speaker other than a display function, are developed and produced in many various ways. As well as the usual functions, sound control functions such as volume control, sound mute, and microphone ON/OFF are added to the display device, and they are controlled by a special sound circuit. Frequently, a sound signal transmitted by the output terminal of a computer sound card is applied to the sound amplifier through a special sound circuit in the display device.
When controlling such the sound functions, noise and pop problems can occur. Also, when using an internal condenser microphone, howling (shrill sound and stripes on the screen of the display device) is caused by interference of speaker signals. This annoys users. Of course, such a machine that annoys users is at heavy disadvantage and causes problems in technical and commercial acceptance.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide an improved sound control circuit and method using a microcomputer.
Another object of the present invention is to provide a sound control circuit and method using a microcomputer for controlling the sound and the relevant functions of a display device by using tactile keys installed on its external surface.
To achieve these and other advantages, a sound control circuit using a microcomputer includes a microcomputer for generating variable signals corresponding to the amount as much as changed in duty (i.e. duty cycle) of pulse width modulation (PWM) output when any sound function key is selected. A sound amplifier control circuit is for controlling sound output through a speaker based on the control signals such as voice signal output level and a sound mute generated by the microcomputer. A sound output unit generates sound resulting from changing sound input based on the output signal generated by the sound amplifier control circuit. A multiplexer controls lighting of a light emitting diode and controls switching of a microphone.
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Bushnell , Esq. Robert E.
Cuchlinski Jr. William A.
Marc-Coleman Marthe
Samsung Electronics Co,. Ltd.
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