CN2068715U

CN2068715U - Low voltage electronic voice-frequency reverberation apparatus

Info

Publication number: CN2068715U
Application number: CN 90204127
Authority: CN
Inventors: 张萃; 靖颖昭
Original assignee: CHINSA COLLEGE OF CIVIL AVIATION
Current assignee: CHINSA COLLEGE OF CIVIL AVIATION
Priority date: 1990-04-09
Filing date: 1990-04-09
Publication date: 1991-01-02

Abstract

The utility model relates to an audio reverberation device which is composed of a signal processing circuit board, the machine shell of the audio reverberation device and a power supply. Full low-voltage components, a BBD component with long delay time, a multiple orders wideband low pass filter, an RC absorb network, a simple circuit which has the functions of filtering, direct sound and delay sound reverberation and a direct current power supply of 4.5V are adopted by the utility model. Stereoscopic double sound and single sound signals input by a sonic equipment can be reverberated. The utility model has low power capacity, and can be used for various places requiring sound effects.

Description

Low voltage electronic voice-frequency reverberation apparatus

The utility model relates to sound technique.

Existing audio reverberation device adopts the 220V AC power, and power consumption is big, and volume is big, and is not portable; The employing DC voltage (15V) that also has, time delay short (76MS), frequency band narrow (6KHZ) can only produce mixing sound, can not echogenicity, also be unsuitable for the music reverberation.

The purpose of this utility model provides a kind of small-sized (portable), low pressure, and time delay is long, and bandwidth can be realized the audio reverberation device of high-quality mixing sound, echo and multiple specific sound effect.

The purpose of this utility model is achieved in that audio reverberation device block scheme as shown in Figure 2.Sound signal by the stereo set input is sent into the totalizer stack after amplifier amplifies, its output adds preliminary low-pass filter, with noise distortion in the reduction system and slew rate, add secondary low pass filter behind the delayed circuit delay, with filtering high fdrequency component and difference frequency thereof, then feed back to preliminary low-pass filter and carry out audio reverberation by RC absorption networking, RC absorption networking can reduce the high-frequency signal composition in the feedback step, the simulated sound reflecting material is to the natural tendency of the absorption of high frequency, and give audio component with reverberation more, at last by preliminary low-pass filter output reverberant audio signal, to loudspeaker, the input end of stereo sets such as sound-track engraving apparatus.

The utility model is owing to adopted full low-voltage device, (DC=4.5～5V) does power supply can to use three joint dc batteries, adopt long BBD device time delay, five rank, seven rank low-pass filters and RC absorb the networking, thereby broadening frequency band, reduced noise distortion and the slew rate and the radio-frequency component of system, filtering, reverberation and through circuit are taken into account.Therefore, not only simplify circuit, and can produce mixing sound, echo and multiple different special acoustics.Can be used for to simulate in common place the place of special sound equipment (as square sound, mountain valley sound, terrified sound etc.), and can improve, beautify language, music, song, make it produce Concert, also can cooperate the generation special-effect with music such as mellotron.

The utility model physical circuit principle and embodiment accompanying drawings are as follows:

Fig. 1, the reverberation circuit structure drawing of device, Fig. 1 (a) is its front elevation, Fig. 1 (b) is its vertical view

Fig. 2, block scheme

Fig. 3, circuit theory diagrams

Fig. 4, audio reverberation circuit arrangement are connected use figure with external device (ED)

(1) is shell among Fig. 1, (2) No. 5 battery three joints, (3) base plate, (4) circuit board gib screw, (5) nut is fixed on circuit board (16) on the bearing plate frame (6), (7) panel and panel bearing support, (8) MIC IN socket, (9) STER IN socket, (10) power light, (11) power switch, (12) potentiometer is adjusted it and can be changed time delay, (13) external power supply jack, (14), (15) are two audio input jacks.Reverberator physical dimension is 156 * 95 * 32(mm) ², shell and chassis are made by aluminium sheet.After superposeing in totalizer by the monophonic signal of the three-dimensional alliteration signal of stereo sets such as mellotron inputs and amplification, (three-dimensional alliteration signal and monophonic signal also can be distinguished input separately) is through elementary low-pass filtering, postpone, after the secondary low-pass filtering, feed back to preliminary low-pass filter by RC absorption networking again and in preliminary low-pass filter, export after the reverberation, as shown in Figure 3 as postponing the through component of component and audio frequency.Monophonic signal is through C ₁₀(3.4 μ F) and input regulator potentiometer W ₃(10K Ω) is added to the note amplifier IC that 1/2LM358 constitutes ₃2 ends, feedback resistance R ₂₂(75K Ω), 1 end is exported through capacitance C ₃(0.22 μ F) is added to the totalizer IC that is made of 1/2LM358 _1-b2 ends, three-dimensional alliteration signal is through C ₁, C ₂(0.22 μ F) also is added to 2 ends, exported through input regulator potentiometer W by 1 end ₁(5K Ω) is added to preliminary low-pass filter first order 1/2LM358IC _1-b6 ends, preliminary low-pass filter is five rank low-pass filters, is made of four 1/2LM358 and corresponding Resistor-Capacitor Unit, its each component parameters is: R ₉=R ₁₀=R ₁₂=R ₁₃=R ₁₆=R ₁₇=18K Ω, C ₄=C ₆=C ₇=C ₈=C ₉=1000PF, its bandwidth are 9KHZ.After elementary filtering by 1/2LM358 IC _2-61 end through C ₁₂(3.3 μ F) transports to first order delay circuit MN3207IC ₄3 ends, after the first order postpones by 7 ends, 8 ends through R ₂₇, R ₂₈(5.6K Ω) and capacitance C ₁₃(3.3 μ F) adds to second level delay circuit MN3208 IC ₅7 ends, after the second level postpones by 3 ends, 4 ends through R ₃₂, R ₃₃(5.6K Ω) and C ₁₄(3.3 μ f), RC low pass networking (R ₃₈=18K Ω, R ₃₆=100K Ω, C ₁₆=1000PF, C ₁₅=0.22 μ F, C ₁₈=1000PF) add to the first order 1/2LM358 IC of secondary low pass filter _7-a3 ends.Secondary low pass filter is the low acceptors in seven rank, is made of 4 1/2LM358 and corresponding capacitance-resistance original paper, and its each component parameters is: R ₄₁=R ₄₃=R ₅₁=R ₅₀=R ₄₆=R ₄₇=18K Ω, R ₄₀=15K Ω, R ₄₂=24K Ω, C ₂₀=C ₂₁=C ₂₄=C ₂₅=C ₂₂=C ₂₃=1000PF.Signal after secondary low-pass filtering is by 1/2LM358IC _8-b7 ends through R ₄₅(100K Ω) and feedback regulation potentiometer W ₂(470K Ω) adds to RC and absorbs networking (R ₁₁=30K Ω, R ₉=100K Ω, C ₅=1000PF) add to preliminary low-pass filter first order 1/2LM358IC again _1-b5 ends.MN3102IC ₆Constitute clock generator, W ₄=220K Ω, C ₂₆=100PF, the output of 2 ends adds to MN3207IC respectively ₄2 ends, MN3208IC ₅6 ends; The output of 4 ends adds to MN3207IC respectively ₄6 ends, MN3203IC ₅2 ends.Postpone sound signal and through sound signal in preliminary low-pass filter after the reverberation, by 1/2LM358IC _2-b1 end output audio reverb signal, as shown in Figure 3.The use of reverberator as shown in Figure 4, the output signal of mellotron is inserted the input jack of reverberator with two leads, the output signal of reverberator is received the circuit input of sound-track engraving apparatus with two leads, regulate the time delay of reverberator as required, play mellotron, can on sound-track engraving apparatus, hear the music that has reverberation effect.In other occasion, also available microphone (or sound source of other kind) replaces mellotron, replaces sound-track engraving apparatus with sound amplifier (or stereo set), uses connecting mode constant, also can hear the sound that special-effect is arranged after reverberator is handled.

Claims

1, a kind of audio reverberation device, it is made up of the circuit board of signal Processing and the casing and the power supply of device, it is characterized in that from the input signal of stereo set preliminary low-pass filter through circuit board, delay circuit, after secondary low pass filter is handled, RC absorption networking by circuit board feeds back to preliminary low-pass filter again, and is exported by the output terminal of said preliminary low-pass filter, to the input end of stereo sets such as loudspeaker, sound-track engraving apparatus.

2, by the described device of claim 1, it is characterized in that circuit board (16), be fixed on the bearing plate frame (6) by screw (4), nut (5), and formed by shell (1), three joint No. 5 batteries (2), base plate (3), panel and panel bearing support (7), MIC IN socket (8), STER IN socket (9), power light (10), power switch (11), potentiometer (12), external electric supply socket (13) and two input jacks (14), (15).

3, by the described device of claim 1, it is characterized in that before the preliminary low-pass filter totalizer being housed, monophonic signal through amplifying and alliteration signal are sent into preliminary low-pass filter after being superposeed by totalizer.

4,, it is characterized in that the primary and secondary low-pass filter forms IC by the above low-pass filtering of single order by the described device of claim 1 ₁, IC ₂, IC ₇, IC ₈Select the LM358 low-voltage device for use, delay circuit is selected the BBD device of growing low pressure, time delay for use.

5, by the described device of claim 1, it is characterized in that each component parameters is in said FBN feedback network and the low-pass filter: R ₄₅=R ₉=80～130K Ω, R ₁₁=20～39K Ω, W ₂=0～470K Ω, C ₅=800～1300PF, R ₈=R ₁₀=R ₁₂=R ₁₃=R ₁₆=R ₁₇=15～30K Ω, C ₄=C ₇=C ₈=1000PF, the delay time T 〉=150MS of delay circuit, supply voltage DC=4.5～5V, low-pass filter frequency range B 〉=9KHZ.