KR20020003785A - Line selector for speaker signal of personal computer - Google Patents

Abstract

PURPOSE: A speaker output signal converter is provided to convert a signal outputted to a speaker of a sound card, output the signal converted into a headset or the speaker by the user clicks a hot key of a keyboard or a mouse. CONSTITUTION: A conversion request signal is received when a user clicks a hot key of a keyboard or a mouse through a control program. A relevant signal is outputted to a COM port. A short-circuit and an opening of an analog switch connected to a sound output terminal are performed. An output signal is selectively converted and outputted to a headset or a speaker. An analog switch circuit unit is composed of a headset short-circuit unit and a speaker short-circuit unit. The headset short-circuit unit performs a short-circuit of a headset input terminal in case that a sound signal is outputted to the speaker. The headset short-circuit unit prevents an input of sounds to the headset. The speaker short-circuit unit performs a short-circuit of the speaker in case that a sound signal is outputted to the headset. The speaker short-circuit unit prevents an input of sounds to the speaker.

Description

Speaker output signal converter {LINE SELECTOR FOR SPEAKER SIGNAL OF PERSONAL COMPUTER}

Recently, with the rapid spread of the Internet, services that use sound such as Internet phones, MP3 music files, and Internet movie watching have become commonplace. Along with this, sound cards, speakers, and headsets that output sound are also rapidly spreading.

Ordinary users want to use the speaker and the headset together. When you want to share the sound with the people around you, or when you are uncomfortable wearing the headset for a long time, use the speaker. In the case of an Internet phone, a headset is essential because of the characteristics of the phone.

However, only one output signal terminal of the sound card is prepared for the speaker, and users may alternate speaker tweets and headset tweets to the sound card, or use a split tweet. Alternating the tweets is a very cumbersome thing because of all the connections behind the computer, and split tweets produce both the speaker and the headset, so turn the speakers off or adjust the volume according to the surrounding conditions. This is also because the speaker power switch is behind the speaker, or turn it off while rotating, you feel a lot of inconvenience.

Recently, a changer using a mechanical changeover switch has been introduced, which is expensive and has a disadvantage in that wiring is complicated and cumbersome because the switch case needs to be located in front of the user.

The present invention all the connections are made from the back of the computer in order to inexpensively and conveniently convert the speaker output signal of the sound card to the headset and the speaker, the keyboard shortcut or mouse click signal by the user's control program It is an object of the present invention to achieve a selective output to a speaker or a headset.

1 is a circuit diagram to which the present invention is applied.

When described in detail with the accompanying drawings as follows.

1 is a circuit diagram to which the present invention is applied, and is composed of a COM port connection part, a signal inversion NOT GATE, and an analog switch part.

The COM port connection connects to the computer's RS232C port and supplies operating power and control signals. In the present invention, for the sake of price, the DTR and RTS signals are directly controlled by the control program without using the serial communication of the RS232C port and utilized as two bit signals. The RTS is used as a + 15V supply through the reverse voltage protection diode, and the DTR is also sent to the signal inversion NOT GATE through the reverse voltage protection diode to serve as a switching control signal.

Signal Inversion NOT GATE converts the signal of DTR into two opposite signals so that the opening and closing of analog switches is reversible.

The analog switch circuit section consists of a headset short section and a speaker short section. When the headset short circuit outputs a sound signal to the speaker, the headset input terminal is shorted to block the sound from entering the headset, and the output is output to the speaker by the voltage drop resistor. When the speaker short circuit outputs a sound signal to the headset, the speaker input terminal is shorted to block the sound input to the speaker, and the output is output to the headset by the voltage drop resistor.

The control program turns on the RTS of the corresponding COM port to supply power after computer operation, and receives the user's request through keyboard or mouse click to turn on / off the DTR to perform the switching control.

As described above, the present invention converts the speaker output signal of the sound card into a headset or a speaker by a keyboard shortcut or a mouse click from the user, which is very convenient to use, and since all wiring between the switch and the computer is made at the back of the computer, it is not complicated. It can be configured inexpensively without.

Claims (2)

The control program receives input of the switching request signal through keyboard shortcuts or mouse click inputs and outputs the corresponding signal to the COM port to short-circuit and open the analog switch connected to the sound output terminal. How to switch the sound card speaker output signal of a personal computer. This method is to convert DTR signal and RTS signal of RS232C COM port of computer directly into bit signal and use it as + 15V power and switching control signal.