KR100220597B1 - Apparatus for controlling audio output automatically - Google Patents

Abstract

The present invention relates to a method of converting an audio output form according to a type of a signal input from a high definition television (HDTV) that can be used as a monitor of a personal computer. To this end, the present invention relates to a PC video signal input to an input means. And a mode discriminator for generating a mode discrimination signal corresponding to an input video signal based on a synchronization signal of an HDTV video signal, and a plurality of channels for controlling audio output of a plurality of channels in response to the mode discrimination signal from the mode discriminator. A control unit for generating a control signal, the first switching unit for selectively switching the left and right audio signals of the PC and the left and right audio signals of the HDTV based on the control signal from the control unit, the input image is an HDTV image In this case, on the basis of control signals from the control unit, mid-range, bass, left surround, and right surround audio of the multi-channel of HDTV A second amplifier for switching an erroneous signal, a first amplifier for amplifying each of the selected left and right audio signals provided through the first switching unit to a predetermined predetermined level and outputting them to respective speakers, and a middle tone provided from the second switching unit And a second amplifier for amplifying the bass, left surround, and right surround audio signals to a predetermined predetermined level and outputting the amplified audio signals to respective speakers.

Description

Automatic Audio Switching for High-Definition Television (HDTV)

The present invention relates to the audio output of HDTV (hereinafter, referred to as HDTV), and more particularly, to a type of signal input from an HDTV including a function of a personal computer (PC) monitor. The present invention relates to an audio output automatic switching device of HDTV suitable for converting audio output to 6 channels or 2 channels.

As is well known, HDTV refers to a TV that improves image quality by increasing vertical and horizontal resolutions by increasing the aspect ratio and increasing the number of scanning lines and pixels.

In the case of such HDTV, the audio output is defined as six channels according to the dolby AC coding standard, i.e., six channels of left and right audio and mid, bass, left surround and right surround audio. Therefore, such HDTV can realize not only high picture quality but also high quality audio.

Recently, in accordance with the trend of multimediaization, a function of making HDTV compatible with PC monitor has been adopted. Therefore, in the HDTV employing the PC monitor function, not only the HDTV signal but also the PC signal can be processed.

On the other hand, as described above, the HDTV audio output has six channels while the PC audio signal has only two channels, i.e., left and right audio signals. Therefore, when implementing the PC monitor function on the HDTV, channel switching between HDTV audio signals and PC audio signals having different channel numbers is essential.

However, there is currently no known technology for processing PC audio signals in consideration of different channels when accommodating PC signals on HDTV.

Accordingly, the present invention has been made in view of the above, and it is possible to determine the type of video or audio signal input from a HDTV capable of accommodating PC signals, and to automatically switch two channel or multichannel audio outputs according to the determination result. The purpose of the present invention is to provide an audio output switching device of HDTV.

In order to achieve the above object, the present invention provides a mode discrimination unit for generating a mode discrimination signal corresponding to a video signal input based on a synchronization signal between a PC video signal and an HDTV video signal input to an input unit. A control unit for generating a plurality of control signals for controlling the audio output of a plurality of channels, respectively, in response to the mode discrimination signal, and the left and right audio signals of the PC and the left and right of the HDTV based on the control signals from the control unit. A first switching unit for selectively switching the audio signal, When the input video is an HDTV video, the second switching unit for switching the mid-range, bass, left surround, right surround audio signal of the multi-channel of the HDTV based on a control signal from the control unit The switching unit amplifies the selected left and right audio signals provided through the first switching unit to a predetermined predetermined level, respectively. Audio output of the HDTV including a first amplifier for outputting to the Kerr, and a second amplifier for amplifying each of the mid, bass, left and right surround audio signals provided from the second switching unit to a predetermined predetermined level and outputs to each speaker Provide automatic switching device.

1 is a block diagram of an automatic audio output switching device of HDTV according to a preferred embodiment of the present invention

2 is a circuit diagram showing the configuration of a control unit in the audio output automatic switching device of the HDTV according to a preferred embodiment of the present invention

3 is a circuit diagram showing the configuration of each switching unit in the audio output automatic switching device of the HDTV according to a preferred embodiment of the present invention

* Explanation of symbols for main parts of the drawings

10: mode determination unit 20: control unit

30: first switching unit 40: second switching unit

50: first amplifier 60: second amplifier

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of an audio output automatic switching device of an HDTV according to a preferred embodiment of the present invention. The mode determination unit 10, the control unit 20, the first switching unit 30, and the second switching unit 40 are shown. ), A first amplifier 50, and a second amplifier 60.

The mode determination unit 10 determines the mode of the signal input by the synchronization signal inserted in the HDTV signal and the PC signal, and provides the corresponding mode determination signal to the control unit 20. The above mode determination unit As an example of the mode determination method of (10), since the number of channels of the HDTV audio signal and the PC audio signal is different, a method of discriminating the mode can be considered by counting and comparing the number of channels of the input audio signal. In the HDTV, an input terminal for inputting a PC signal and an input terminal for inputting an HDTV signal are separately installed, and a method of discriminating a mode according to whether a signal is input to each terminal may be considered.

On the other hand, the control unit 20 is composed of a mute circuit 25 and a plurality of transistors Q1, Q2, Q3, as shown in FIG. 2, and the control unit 20 responds to the mode determination signal from the mode determination unit 10 described above. In response, a switching control signal for switching the outputs of 6-channel audio, i.e., left and right sounds, mids, bass, and left and right surround audio, is generated on the lines 22, 23, 24, 25, and 26, respectively. Control output operations of the first and second switching units 30 and 40 and the first and second amplifiers 60 and 60.

That is, the control unit 20 selectively applies a voltage to the first switching unit 30 based on the determination signal of the mode determination unit 10 to switch the output, and the second switching unit 40 and the first amplifier ( 50), a block signal is generated in the second amplifier 60 to control an operation, and a block signal according to power ON / OFF is provided to the first amplifier 50 and the second amplifier 60. .

The mute circuit 25 generates a cutoff signal according to the mode determination signal provided from the mode determination unit 10, and the line 21 supplies power only when the input signal is a PC signal.

3 is a circuit diagram showing the configuration of each switching unit 30 and 40 in the audio output automatic switching device of the HDTV according to the preferred embodiment of the present invention.

As shown in (a) of FIG. 3, an emitter follower is connected to the first switching unit 30 in parallel, and the left and right audio signal input lines of the HDTV are respectively connected to both base ends. Lines 11 and 12 input the left and right audio signals of the PC and are selectively supplied with power by the control signals of the control unit 20 and the input left and right lines. Output terminals (lines 31 and 32) for outputting audio signals are configured.

As shown in (b) of FIG. 2, the second switching unit 40 also includes an emitter follower and includes four channels except for left and right signals among the audio signals of the HDTV, that is, midtone, bass, left surround, and right. An input terminal (line 13) receiving a surround audio signal, a line 24 supplied with power under the control of the controller 20, and lines 41, 42, 43, 44 generating an output for the input signal. Configure.

The control process of each of the switching units 30 and 40 and the amplifiers 50 and 60 according to the control signal of the control unit 20 based on the mode determination signal described above will be described in detail with reference to FIGS. 1, 2, and 3. Is as follows.

When the mode determination signal for the PC signal is generated from the mode determination unit 10 and provided to the control unit 20, the line 21 applies a current to operate the first transistor Q1 and the second transistor Q2. Low potential flows through the line 22 and the line 24 connected to the collector stage of the line 26 and the line 26 connected to the third transistor Q3.

Therefore, the left and right audio signals of the PC input through the line 12 of the first switching unit 30 by the current supplied to the line 23 are output to the lines 31 and 32 and the first is output. The fourth transistor Q4 and the second switching unit 40 of the first switching unit 30 connected to the line 22 and the line 24 connected to the collector terminal of the second transistor Q2 and provided to the amplifier 50. The sixth transistor Q6 of) does not operate.

When the PC signal is input, the mute circuit 25 generates a cutoff signal and transmits the cutoff signal to the line 26 connected to the third transistor Q3, thereby controlling the operation of the second amplifier 60. A first amplifier 50 by outputting the left and right audio signals of the PC input through the line 12 of the first switching unit 30 shown in 3 (a) through the line 31 and the line 32. ), The first amplifier 50 amplifies the left and right audio signals of the PC provided from the first switching unit 30 and outputs them through the speaker.

On the other hand, when the HDTV signal is input to the HDTV combined with the PC monitor, the mode determination unit 10 generates a mode determination signal corresponding to the HDTV signal to the control unit 20 and provides the control unit 20 to the control unit 20, and the control unit 20 generates a first signal. The line 21 of the first transistor Q1 applies power only when the PC signal is input to the HDTV, and thus becomes low potential when the HDTV signal is input.

Accordingly, the output of the line 23 becomes low potential, and the line 22 and the line 24 connected to the collector terminal of the second transistor Q2 become high potential so that the first switching unit connected to the line 23 ( The fifth transistor Q5 of 30 does not operate, and the fourth transistor Q4 of the first switching unit 30 connected to the line 22 is left and right audio of the HDTV input through the line 11. The signal is output to the lines 31 and 32 and provided to the first amplifier 50, and the sixth transistor Q6 of the second switching unit 40 connected to the line 24 is connected to the line 13. The mid-, low- and left-right surround audio of the HDTV inputted through the line 41, the line 42, the line 43, and the line 44 are output to the second amplifier 60, respectively.

In addition, the first amplifier 50 and the second amplifier 60 are left and right audio signals and low, middle and left and right surround audio signals of the HDTV provided from the first switching unit 30 and the second switching unit 40. Amplifies the output to each of the six speakers.

Therefore, as described above, it is possible to automatically switch the audio output form according to the type of the input audio signal.

As described above, according to the present invention, when the output is to be switched according to the audio signal input from the HDTV that can also function as a PC monitor, it can be automatically switched in the system without manual intervention by the user, thereby improving the convenience of use of the product. It can be effected.

Claims (3)

In the device for automatically switching the Dolby audio output having a plurality of channels in HDTV that can accommodate PC and HDTV video, A mode determination unit for generating a mode determination signal corresponding to the video signal input based on the synchronization signal between the PC video signal and the HDTV video signal inputted to the input means; A control unit for generating a plurality of control signals for controlling the audio output of the plurality of channels, respectively, in response to the mode determination signal from the mode determination unit; A first switching unit for selectively switching left and right audio signals of the PC and left and right audio signals of the HDTV based on a control signal from the controller; A second switching unit for switching a mid-range, a bass, a left surround and a right surround audio signal among the multi-channels of the HDTV based on a control signal from the controller when the input image is an HDTV image; A first amplifier for amplifying the selected left and right audio signals provided through the first switching unit to a predetermined level and outputting the amplified signals to respective speakers; And a second amplifier for amplifying the mid, bass, left and right surround audio signals provided from the second switching unit to a predetermined level and outputting the amplified audio signals to respective speakers. The apparatus of claim 1, wherein the mode determination unit determines a mode by comparing a number of channels of an input audio signal. The audio output automatic switching device of the HDTV according to claim 1, wherein the mode determination unit determines the mode of the video signal according to whether the input signal of the PC video signal and the input terminal of the HDTV are input. .