CN2267506Y

CN2267506Y - Miniature karaoke device

Info

Publication number: CN2267506Y
Application number: CN 96241240
Authority: CN
Inventors: 李燕; 李健
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-11-04
Filing date: 1996-11-04
Publication date: 1997-11-12
Anticipated expiration: 2006-11-04

Abstract

The utility model provides a miniature karaoke device, comprising a machine core mainboard and a housing. The utility model is characterized in that an amplifying circuit comprises an integrated circuit block element, the integrated circuit block element is composed of four operational amplifiers, and the model number of each of the four operational amplifiers is AN6554; the signal-to-noise of amplified signals is raised through a filter circuit and a delay circuit; as the size of the utility model equals the size of the floppy drive of a microcomputer, the mounting position of the floppy drive of a microcomputer can be utilized, the volume of the utility model is caused to reduce, and the utility model is convenient in use.

Description

Small-sized Caraok device

The utility model relates to a kind of small-sized Caraok device, belongs to the electroacoustic equipment field.

The double antiphonal singing Caraok device that generally uses for the sensation that the singer is realized resemble the professional singer is sung, needs to adopt the whole bag of tricks that hightens the sound effects, usually to obtain the result of broadcast that actuality and telepresenc all significantly improve at present.But, will make circuit and structure Design become complicated like this, and bring volume big and use inconvenience or the like defective.

The purpose of this utility model is to provide a kind of circuit and small-sized Caraok device relatively simple for structure but also that acoustics is good, easy to use of not only making.

The technical solution of the utility model is achieved in that a kind of small-sized Caraok device comprises: movement mainboard and shell, input circuit, amplifying circuit, low-pass filter circuit, delay circuit, filtering circuit and power amplification circuit etc. are installed on the movement mainboard, it is characterized in that: integrated package and peripheral circuit thereof that described amplifying circuit is made up of four operational amplifiers are formed, wherein, the 4th pin of this integrated package is connected to the DC biased level that power supply, the 11st pin be connected to ground, the 12nd pin is provided by the resistor dividing potential drop; Export by the 7th pin through the operational amplifier amplifying signal.

Above-mentioned amplifying circuit comprises the chip component LM324 that is made up of for the AN6554 operational amplifier four models.

Therefore the floppy disk of external structure installation dimension of the present utility model and common computer measure-alike, can utilize the installation site of microcomputer floppy disk, makes its volume little, easy to use.

The embodiment of the small-sized Caraok device of the utility model is described below in conjunction with accompanying drawing.

Fig. 1 is the circuit diagram of the small-sized Caraok device of the utility model;

Fig. 2 is the synoptic diagram that the inside of the amplifying circuit chip component LM324 of the small-sized Caraok device of the utility model connects;

Fig. 3 is the outside drawing of the small-sized Caraok device of the utility model.

See figures.1.and.2, small-sized Caraok device is made of movement mainboard and shell, is equipped with on the movement mainboard: input circuit, amplifying circuit, low-pass filter circuit, delay circuit and power amplification circuit or the like.This device has two an outpost of the tax offices by the OK sound channel of accompanying, and acoustical signal is imported from microphone, amplifies through amplifying circuit, makes its gain be 40dB.Above-mentioned amplifying circuit is made up of chip component LM324 and peripheral circuit thereof, LM324 comprises that four models are the AN6554 operational amplifier, wherein, the 4th pin of this integrated package is received power circuit, the 11st pin is connected to ground, amplifying circuit adopts the secondary amplifying return circuit, by the 1st of LM324,2,3,4,13, two operational amplifiers of 14 pin and peripheral circuit thereof are formed, its enlargement factor is by resistive element (R7, decision such as R9), after being pressed in, resistor R 5 and R6 branch be provided to the 12nd pin of LM324, so that DC biased level to be provided, signal after the secondary operational amplification circuit amplifies is the 7th pin output of LM324 then, output signal is divided into two-way: one road signal enters the BBD delay circuit, and another road signal is through C, R delivers to output loop.

Above-mentioned signal is before entering the BBD delay circuit, through low-pass filter, with signal more than the filtering 8KHZ and noise, this low-pass filter is made up of the internal arithmetic amplifier and the peripheral circuit element thereof of the 8th, 9,10 pin of LM324, its cutoff frequency is about 8KHZ, depends on the numerical value of resistance, appearance element.The required delay circuit of clock circuit, the karaoke accompaniment system of BBD delay circuit and driving usefulness thereof is formed by integrated package MN3207 and peripheral circuit thereof, MN3207 is that the low noise BBD of 1024 sections operating on low voltage constitutes, and is made up of integrated package MN3102 and peripheral circuit thereof and drive the required clock circuit of BBD.The signal of the 7th, the 8 pin output signals of MN3207 for postponing through BBD.MN3102 is a CMOS two phase clock generation circuit, and its inside comprises the required Vaa of BBD and produces circuit.MN3102 and 3207 forms the reverberation treatment circuit, handles when signal is postponed.In the time delayed signal that 7,8 pin of MN3207 are exported, include clock-pulse component, if this high frequency clock component seals in above-mentioned circuit, will produce the high frequency howling, the signal to noise ratio (S/N ratio) of circuit is descended, therefore the performance of filtering circuit directly influences the product quality of Ben Kala OK device, and the filtering circuit of this device is made up of clock-pulse component bucking circuit, RC low-pass filter and step low-pass network.Because the phase place of the clock-pulse component in the 7th, the 8 pin output signals of MN3207 is opposite, therefore, adds a clock component bucking circuit at output terminal and get final product contained clock-pulse component in the erasure signal.Thereafter, behind the filtering circuit of output signal via C19, R36, R37, R19, R20, C9, C10, R21, C11 composition, further filtering clock signal and other undesired signal, enter the 10th pin of LM324 at last, the in-phase amplifier of being made up of the 8th, 9,10 pin of LM324 further amplifies signal.Enter the 3rd pin of LM386N-1 after the BBD inhibit signal addition by the 1st pin of LM324 and the output of the 8th pin, signal is carried out power amplification,, send into earphone or back level power amplifier at last by the 5th pin output of LM386N-1.

The floppy drive identical (referring to Fig. 3) of the small-sized Caraok device external form of the utility model and common computer, the microcomputer floppy disk that adapts with it is of a size of 5 cun (greatly) and 3.5 cun (little).

Claims

1, a kind of small-sized Caraok device, this device comprises: movement mainboard and shell, input circuit, amplifying circuit, low-pass filter circuit, delay circuit and filtering circuit and power amplification circuit etc. are installed on the movement mainboard, it is characterized in that, integrated package and peripheral circuit thereof that described amplifying circuit is made up of four operational amplifiers are formed, wherein, the 4th pin is connected to power supply, the 11st pin is connected to ground, and the DC biased level of the 12nd pin is provided by resistance device dividing potential drop; Signal through operational amplifier is exported by the 7th pin.

2, small-sized Caraok device according to claim 1 is characterized in that, described amplifying circuit comprises the chip component LM324 that is made up of for the AN6554 operational amplifier four models.