KR19980060124U - Digital audio control in computer with optical disc drive - Google Patents

Abstract

The present invention relates to an apparatus for controlling digital audio in a computer equipped with an optical disk drive, comprising: a first connector (20) for transmitting a digital audio signal from the optical disk drive; A digital audio signal control circuit 30 for controlling the output DOBM_OUT of the digital audio signal input from the first connector 20; A filter (40) for filtering and outputting the signal (DOBM_OUT) output from the digital audio signal control circuit (30); It includes a second connector 50 for transmitting the signal output from the filter 40 to an external amplifier, and directly controls the digital audio signal provided by the optical disk drive from a computer rather than an external amplifier, and the connection to the external amplifier The present invention relates to a digital audio control apparatus in a computer equipped with an optical disc drive, which has an effect of facilitating user convenience by making it easy.

Description

Digital audio control in computer with optical disc drive

The present invention relates to an apparatus for controlling digital audio in a computer equipped with an optical disk drive, and more specifically, to an apparatus for controlling digital audio provided by an optical disk drive in a computer main body. will be.

Hereinafter, a conventional technology will be described with reference to the drawings.

1 is a diagram illustrating an example of using digital audio in a computer equipped with an optical disc drive.

As shown in FIG. 1, most of the optical disc drives 11 mounted in the computer main body 10 provide a stereo audio (CD-Audio Left / Right) signal and a digital audio signal. IDE I / F (Integrated Device Electronics Interface). However, there are some optical disc drives that provide only stereo audio signals. The stereo audio signal provided as described above is output to the external speaker 13 through the speaker connection terminal of the computer via the control unit 12, and the digital audio signal is connected to an external amplifier (Hi-) including a digital analog converter (DAC). It is output to the external speaker 15 through FiAMP with DAC, 14. This generalized stereo audio signal can be easily connected through a connector or the like when interfacing with a computer (I / F).

However, since the conventional technology does not provide a separate interface for digital audio signals in a computer, there is a difficulty in connecting and cabling with an external amplifier, and since the digital audio signal is controlled by an external amplifier, There is a problem that it is impossible to control integrally.

Therefore, the object of the present invention is to solve the above problems, and it is possible to control the digital audio signal provided by the optical disk drive directly from a computer, not an external amplifier, and to connect an external amplifier with a computer equipped with an optical disk drive. To provide a digital audio control device.

1 is a diagram illustrating an example of using digital audio in a computer equipped with an optical disc drive.

2 is a diagram illustrating an example in which a digital audio control apparatus according to an embodiment of the present invention is mounted on a computer.

3 is a detailed circuit diagram of a digital audio control device according to an embodiment of the present invention.

The inventive arrangement for achieving the above object comprises: a first connector for transmitting a digital audio signal from an optical disc drive; A digital audio signal controller controlling an output of the digital audio signal input from the first connector; A filter for filtering a signal output from the digital audio signal controller; And a second connection unit for transmitting a signal output from the filter to an external amplifier.

An embodiment of this invention by the above-described configuration will be described with reference to the accompanying drawings.

2 is a diagram showing an example in which a digital audio control device according to an embodiment of the present invention is mounted on a computer, and FIG. 3 is a detailed circuit diagram of the digital audio control device according to an embodiment of the present invention.

As shown in FIG. 3, the digital audio control apparatus 200 according to the embodiment of the present invention includes: a first connector 20 for transmitting a digital audio signal from an optical disc drive; A digital audio signal control circuit 30 for controlling the output DOBM_OUT of the digital audio signal input from the first connector 20; A filter 40 for filtering and outputting the signal DOBM_OUT output from the digital audio signal control circuit 30; And a second connector 50 for transmitting the signal output from the filter 40 to an external amplifier.

The digital audio signal control circuit 30 further includes a clock generation circuit 37 for outputting a clock when a specific address is input; A D-Flip Flop 38 for receiving a clock from the clock generation circuit 37 and outputting an enable or disable signal; According to the signal DOBM_EIN from the de-flop 38, an active low buffer 39 that controls the output DOBM_OUT of the digital audio signal is formed.

In addition, the clock generation circuit 37 may include: an arm (PAL; Programmable Array Logic, 31) for outputting a high signal when a specific address is input through the AT bus 60; A four-input and gate (32) outputting an AND of the signals (PCACS, CLK, IOW, and RESET) input through the arm 31 and the AT bus 60; A first inverter (3) for inverting and outputting the signal BA3 input through the AT bus 60; A second inverter (34) for inverting and outputting the signal BA2 input through the AT bus 60; A three-input NAND gate that receives the output signal of the first inverter 33, the output signal of the second inverter 34, and the signal BA1 input through the AT bus 60, and logically inverts and inverts the output signal. 3-Input NAND Gate, 35); 2 input or gate (36) for receiving the outputs of the four input and gate 32 and the three input NAND gate (35) and logically output.

Next, the operation of the embodiment of the present invention by the above-described configuration will be described with reference to FIGS. 2 and 3.

When power is applied, the computer main body 10 operates, and the control unit 12 controls the digital audio controller 200 according to a user's instruction using a specific address. That is, the digital audio signal output from the optical disc drive 11 supplied to the digital audio control apparatus 200 is controlled to be output to the external amplifier 14 including the digital analog converter (DAC).

It will be described in detail as follows.

When a user inputs a specific address to the control unit 12, this specific address is input to the clock generation circuit 37 in the digital audio control apparatus 200 via the AT bus 60, and at this time, the clock generation circuit 37 The clock is output to the def flip-flop 38. The flip-flop 38 which receives the clock outputs the value input to the D terminal through the AT bus 60 to the active low buffer 39 through the Q terminal. At the same time, the active low buffer 39 controls the output of the digital audio signal DOBMIN received through the first connector 20 according to the control signal DOBM_EIN of the flip-flop 38. The filter 40 filters the output DOBM_OUT of the active low buffer 39 and outputs it through the second connector 50. This output signal is finally output from the speaker 15 through an external amplifier 14 including a digital-to-analog converter (DAC).

The following describes the operation of each component in more detail assuming a specific address of 362H.

The arm 31 is used as an address decoder for the BA [4 ... 9] address, and outputs to the user's 36xH (x means Don't care) input as follows: PCACS) to high.

PCSCS = * / ba4 * ba5 * ba6 * / ba7 * ba8 * ba9

The four input and gate 32 receive PCACS, CLK, IOW (active high) and RESET (active low) signals, and generate the normal clock when the user command (36xH input) is input. The third input NAND gate 35 outputs a low value when 111H is input through the first inverter 33, the second inverter 34, and the AT bus 60. At this time, since the address value of BA3, BA2, BA1 is inputted as 001H, the address used by the user becomes 362H when combined with the previous 36xH. Thus, the two input OR gate 36 outputs a normal clock.

When the normal clock is input, the deflip-flop 38 sets high (1) through the Q terminal when the value of HD [4] data input to the D terminal through the AT bus 60 is 1, and HD [4]. If the value of data is 0, a low signal is output to the active low buffer 39. Since the active low buffer 39 operates when a low signal comes in, if the output DOBM_EIN of the deflip-flop 38 is low, the active audio buffer 39 filters the digital audio signal DOBMIN input through the first connector 20. Output to (DOBM_OUT). On the contrary, when the output DOBM_EIN of the deflip-flop 38 is high, the active low buffer 39 does not operate. Therefore, the digital audio signal DOBMIN input through the first connector 20 is output to the filter 40. DOBM_OUT) Therefore, the digital audio signal is controlled by the digital audio signal control circuit 30.

The data input to the D terminal of the flip-flop 38 uses one of HD [0 ... 4] data.

Meanwhile, in the embodiment of the present invention, the clock generation circuit 37, the digital audio signal control circuit 30, and the digital audio control apparatus 200 are configured as described above, but since this is only one embodiment, the gist of the present invention is provided. Changes can be made without departing.

As described above, in the embodiment of the present invention, an optical disk drive having the effect of controlling the digital audio signal provided by the optical disk drive directly from a computer instead of an external amplifier and facilitating user convenience by easily connecting to the external amplifier. It provides a digital audio control device in a computer equipped with a.

Claims (3)

A first connector 20 for transmitting the digital audio signal from the optical disc drive; A digital audio signal control circuit 30 for controlling the output DOBM_OUT of the digital audio signal input from the first connector 20; A filter 40 for filtering and outputting the signal DOBM_OUT output from the digital audio signal control circuit 30; And a second connector (50) for transmitting a signal output from the filter (40) to an external amplifier, and equipped with an optical disc drive. The method of claim 1, wherein the digital audio signal control circuit 30, A clock generation circuit 37 for outputting a clock when a specific address is inputted; A deflip-flop (38) which receives a clock from the clock generation circuit (37) and outputs an enable or disable signal; And an active low buffer (39) for controlling the output of the digital audio signal (DOBM_OUT) in accordance with the signal (DOBM_EIN) from the deflip-flop (38). The clock generation circuit 37 of claim 2, An arm 31 that outputs a high signal when a specific address is input through the AT bus 60; A four-input and gate 32 for logically multiplying signals (PCACS, CLK, IOW, RESET) input through the arm 31 and the AT bus 60; A first inverter 33 for inverting and outputting the signal BA3 input through the AT bus 60; A second inverter 34 that inverts and outputs the signal BA2 input through the AT bus 60; A three-input NAND gate that receives the output signal of the first inverter 33, the output signal of the second inverter 34, and the signal BA1 input through the AT bus 60, and logically inverts and inverts the output signal. 35); And a two-input ora gate (36) which receives the output of the four-input end gate (32) and the three-input nand gate (35) and logically combines the outputs.