CN2149739Y

CN2149739Y - Digital type arrangement for correcting frequency response

Info

Publication number: CN2149739Y
Application number: CN 92243520
Authority: CN
Inventors: 陶波
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-12-14
Filing date: 1992-12-14
Publication date: 1993-12-15
Anticipated expiration: 2002-12-14

Abstract

The utility model relates to a digital type adjuster for correcting tone, comprising an audio signal input unit, an audio signal processing unit, an audio signal output unit, a reference signal setup unit and a digital-analogue conversion unit. The output terminal of the input unit is connected with a first input terminal of the processing unit whose two output terminals are respectively connected with the input terminals of the reference signal setup unit and the digital-analogue conversion unit. The output terminal of the reference signal setup unit is connected with a second input terminal of the processing unit. The output terminal of the digital-analogue conversion unit is connected with the input terminal of the output unit. The utility model can continuously adjust the height of the tone of the music.

Description

Digital type arrangement for correcting frequency response

The utility model relates to the digital tone controller of a kind of tone controller, particularly a kind of continuous tuning, and it belongs to the sound appliances technical field.

Present popular along with the karaoke form, increasing family or public place of entertainment all have been equipped with the accompaniment stereo set.An outstanding weakness is exactly that accompaniment music may be too high or too low concerning different singers in the use, occurs often singing to get on or falls the difficult situation that do not get off, has influenced singing effect, thereby has restricted popularizing of Karaoke to a certain extent.

In view of the above problems, the purpose of this utility model will provide the digital tone controller of a kind of tone controller, particularly a kind of continuous tuning exactly, with the unalterable problem of the tone that overcomes accompaniment music.

The technical solution of the utility model is as follows, its digital tone controller comprises the audio signal input unit, audio signal processing unit and audio signal output unit, it is characterized in that said digital tone controller also comprises reference signal setup unit and D/A switch unit, the output of wherein said audio signal input unit links to each other with the first input end of said audio signal processing unit, first and second outputs of said audio signal processing unit link to each other with second input of said audio signal processing unit with the input of said reference signal setup unit and the output of said D/A switch unit respectively, and the output of said D/A switch unit links to each other with the input of said audio signal output unit.Audio signal by audio signal input unit input is handled the adjusting that realize tone height according to the reference signal that the reference signal setup unit is produced to it through audio signal processing unit, and the audio signal that regulates is exported through the audio signal output unit after the D/A switch unit is reduced into simulation Xin number again.

After having adopted tone controller of the present utility model, the accompaniment stereo set just can be regulated the tone of accompanying music according to different singers.

Below in conjunction with accompanying drawing, with the form of specific embodiment to further more detailed description of the present utility model.

Fig. 1 is the theory diagram of an embodiment of the utility model;

Fig. 2 is a line map embodiment illustrated in fig. 1.

Referring now to Fig. 1, digital tone controller of the present utility model comprises audio signal input unit 1, audio signal processing unit 2, reference signal setup unit 7, D/A switch unit 8 and audio signal output unit 9, wherein audio signal processing unit is by comparator 3, analog/digital converter 4, arithmetic unit 5 and frequency divider 6 formed, and audio signal input unit 1 and simple signal output unit 9 are made up of low pass filter.The audio signal of input filters high-frequency noise more than the 12KHE, input audio signal processing unit 2 through the low pass filter of audio signal input unit 1.This signal is adjusted through the comparator 3 of audio signal processing unit 2 earlier, sends into analog/digital converter 4 then, and audio signal is quantized.Audio signal after the quantification is handled through frequency divider 6 and computing 5, determines audio signals to high frequency or low-frequency range translation by reference signal setup unit 7.Then, send into D/A switch unit 8 again through adjusted quantization audio signal and be reduced into simulated audio signal, at last by high-frequency noise that produces in the audio signal output unit filtering conversion process and output.

With reference to Fig. 2, the audio signal input unit 1 among above-mentioned Fig. 1 is by the universal appliance operational amplifier U1:A among Fig. 2, U2:A, electric cloudy R ₁-R ₆, R22 such as capacitor C ₁-C ₅Form, audio signal processing unit 2 is by the universal appliance voltage comparator U among Fig. 2 ₁Extensive audio signal processor chip U3, resistance R ₇-R ₁₄, potentiometer Rp, capacitor C ₅-C ₉, button p and diode VR1 form, and comparator 3 wherein is by V, R ₇-R ₁₀And C ₅-C ₆Form, analog/digital converter 4, arithmetic unit 5, frequency divider 6 and D/A switch unit 8 are by big digital-to-analogue audio signal processor chip U3 and its peripheral cell (resistance R 9, R11 and R14, capacitor C 6, C7 and C9, button P and 2 grades of pipe VR ₁) form, reference signal setup unit 7 is by resistance R ₁₂-R ₁₃, potentiometer RP and capacitor C 8 are formed, and audio signal output unit 9 is by amplifier U1:C and U1:D, resistance R ₁₅-R ₁₇, R ₁₉-R ₂₁, R ₂₃And capacitor C ₁₀-C ₁₂, C ₁₄-C ₁₈Form, the circuit working principle is as follows: the low pass filter of audio signal through being made up of R1, C1 and U1:A, the above high-frequency noise of filtering 12KHE.Wherein C2, R3 constitute the feedback branch of low pass filter, and C3, C4 are coupled to U1:B to filtered audio signal.The audio frequency amplifier that R5, C4 form is amplified.Be coupled to the in-phase input end of comparator U3 again by C5, R7, the quantification reference level of sending here with U3 compares, and adjusts the amplitude of audio signal.Wherein R9, R10 are the feedback branches of comparator U2, and C6, R8 are that circuit disturbs absorption circuit, and the loop of voltage regulation that C9, VR1 constitute adds fiduciary level 5.1V between R9, the R10, makes the reference potential that auxiliary comparator is adjusted level.R14 is a current-limiting resistance.Adjusted audio signal is delivered to the input of U3, in U3, finish the audio signal quantization operations, revert to the process of analog signal again, C7 wherein, R11 is the quantised samples clock circuit, push-button switch P is the former sound/selection of changing voice, when closed, tone after U3 output was regulated when U3 exported former tone open circuit, C8, R12, R13, Rp forms the external setting-up circuit, Rp is by user's manual adjustments, and when Rp diminished, tone uprised, when Rp increases, tone reduces, and regulatory function is achieved in that C8, R12, R13, the loop that Rp forms produces a predetermined oscillation frequency, and this reference frequency signal is sampled by U3 and the audio signal after U3 inside and quantification is carried out the logical exclusive-OR computing, the result deposits in the U3 memory block (RAM district) at random in, then, frequency divider is the reference frequency signal two divided-frequency, again with frequency division distance audio signal as a result, the result deposits another RAM district in, computing is 11 times so repeatedly, the data phase in all RAM districts " is added " again, sends after the digital-to-analog conversion reverts to audio signal.

Adjusted audio signal is delivered to U1:C, C11, C12, R16, R17 filter through C10, R15, the parallel circuit noise is counted in elimination, and the absorption circuit of being made up of R19, C14, R20, C15 absorbs the peak levels pulse, the audio frequency amplifier of being made up of U1:D, R23, C18 amplifies, and sends through C17.

Below only understand an embodiment of the present utility model by way of example specifically, in fact in total design scope of the present utility model many changes and improvements can also be arranged, these are all in protection range of the present utility model.

Claims

1, a kind of digital tone controller, it comprises the audio signal input unit, audio signal processing unit and audio signal output unit, it is characterized in that said tone controller also comprises reference signal setup unit and D/A switch unit, the output of wherein said audio signal input unit links to each other with the first input end of said audio signal processing unit, first and second outputs of said audio signal processing unit link to each other with the input of said reference signal setup unit and the input of said D/A switch unit respectively, the output of said reference signal setup unit links to each other with second input of said audio signal processing unit, and the output of said D/A switch unit links to each other with the input of said audio signal output unit.

2, sound adjuster as claimed in claim 1 is characterized in that said audio signal processing unit by comparator, analog/digital converter, and arithmetic unit and frequency divider 6 are formed.

3, the described tone controller of claim 1 is characterized in that said audio signal input unit and said audio signal output unit be made up of low pass filter.