DVD machine with karaoke OK
A DVD player, OK technology, used in recording information storage, instruments, electro-acoustic musical instruments, etc., can solve problems such as poor sound quality and affect sound quality, and achieve the effect of improving sound quality and eliminating noise.
Active Publication Date: 2009-06-24
深圳市江元智造科技有限公司
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Problems solved by technology
The inventor has found in practice that the DVD player provided by the above-mentioned prior art will generate noise in various places in the circuit, such as: the noise of the input port 11 is amplified and output to the output port 18, which is affected by various circuit elements, or the noise of the input itself Noise, these noises affect the sound quality, the sound quality is not good
Method used
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[0028] The embodiments of the present invention provide a DVD player with karaoke. In order to make the objectives, technical solutions, and advantages of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0029] figure 2 It is a circuit schematic diagram of a DVD player provided by an embodiment of the present invention. The DVD player includes a circuit board. The circuit board includes: a microphone signal input port 101 is connected to an operational amplifier unit 102, and the operational amplifier unit 102 is connected to analog and digital signals. The processor 103, the analog and digital signal processor 103 is connected to a dual operational amplifier 107, and outputs a signal to the signal output port 108 through the dual operational amplifier 107; the power supply board 105 uses the filter unit 106 for the operational amplifier The unit 102 and the d...
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The invention provides a DVD player provided with a karaoke device, which comprises a circuit board. The circuit board comprises a microphone signal input port which is connected with an operation amplification unit; the operation amplification unit is connected with a simulation and digital signal processor which is connected with a double-circuit operation amplifier; the double-circuit operation amplifier outputs signal into a signal output port; a power supply board supplies power to the operation amplification unit and the double-circuit operation amplifier through a filtering unit; the power supply board supplies power to the simulation and digital signal processor through a steady voltage filtering circuit; and a first noise reduction processing unit is connected in series between the microphone signal input port and the operation amplification unit. As the noise reduction processing unit serves to reduce noise at the part which intends to produce a great amount of noise, the purpose of improving the output sound quality of the DVD player is achieved.
Description
Technical field [0001] The invention relates to a DVD player, in particular to a DVD player with karaoke. Background technique [0002] DVD players are widely used. The DVD players provided by the prior art generally have the function of karaoke, including circuit boards, such as figure 1 As shown, the circuit board includes: a microphone signal input port 11 is connected to an operational amplifying unit 12, the operational amplifying unit 12 is connected to an analog and digital signal processor 13, and the analog and digital signal processor 13 is connected to dual channels. The operational amplifier 17 outputs signals to the signal output port 18 through the dual operational amplifier 17; the power supply board 15 provides power for the operational amplifier unit 12 and the dual operational amplifier 17 through the filter unit 16; the power supply board 15 is stabilized The voltage filter circuit 14 provides power for the analog and digital signal processor 13. In practice, ...
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IPC IPC(8): G11B31/00G10H1/36
Inventor 陈鹏
Owner 深圳市江元智造科技有限公司