CN1048297A - The audio frequency amplifier of scalable hearing distance - Google Patents
The audio frequency amplifier of scalable hearing distance Download PDFInfo
- Publication number
- CN1048297A CN1048297A CN 90102902 CN90102902A CN1048297A CN 1048297 A CN1048297 A CN 1048297A CN 90102902 CN90102902 CN 90102902 CN 90102902 A CN90102902 A CN 90102902A CN 1048297 A CN1048297 A CN 1048297A
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- China
- Prior art keywords
- resistance
- audio frequency
- frequency amplifier
- coupling capacitance
- switch
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- Amplifiers (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
A kind of audio frequency amplifier of scalable hearing distance is used in particular for stereo equipment.Because the input reference edge two sound channels inserts the acoustic image expanding element, thereby, as long as, just cause the change of Amplifier Gain and the broadening or the compression of frequency band, thereby cause the change of hearing distance in the impedance that changes the acoustic image expanding element.
Description
The present invention relates to the improvement of stereo set player, specifically, be a kind of far away, in, the nearly adjustable audio frequency amplifier of hearing distance.
The music that appreciation is broadcasted by broadcast receiver or recorder, some people likes high and low sound abundant, and some people then wishes to have the variation of hearing distance, with enhancing or produce on-the-spot atmosphere.Yet, have not yet to see acoustic product, the also unexposed technical scheme of crossing the adjustable amplifier of hearing distance of patent documentation and relevant magazine with artificial adjusting hearing distance.
The purpose of this invention is to provide the adjustable audio frequency amplifier of a kind of hearing distance, be used in particular for stereo equipment.
According to the auditory physiology phenomenon, to same frequency spectrum sound source, when distance is near, sound giving great volume, bandwidth, special low-frequency component is many, and distance is far away more, sounds that volume is more little, frequency band is narrow more, and low-frequency component is also few more.As seen key of the present invention be how to make Amplifier Gain and frequency band low side respectively classification reduce and compression, reach cause closely, middle distance and remote different senses of hearing.Therefore, technical solution of the present invention is the acoustic image expanding element of two input reference edges accesses at the dual-channel audio amplifier, this unit is by two coupling capacitances and a change resistance part part, connect formation with ' Y ', two coupling capacitances constitute the head of ' Y ', and their free end connects mutually with two input reference edges of audio frequency amplifier respectively, and becomes the body that drives that the resistance part part constitutes ' Y ', its free ending grounding, the resistance that becomes the resistance part part can be by acyclic homologically trioial to certain certain resistance.Like this, when becoming resistance part part resistance into zero the time, two coupling capacitances link to each other with ground, and at this moment, the audio frequency amplifier gain is maximum, and frequency band is the wideest, and particularly low-frequency component is amplified fully.Along with the increase that becomes resistance part part resistance, acoustic image is further expanded, and the gain of audio frequency amplifier is reduced, and frequency band narrows down, and particularly low frequency end is compressed.Thereby change becomes the resistance of resistance part part, sounds the sound source image earthquake.
Advantage of the present invention be simple in structure, cost is low, the sense of hearing audio-visual effects is obvious.Be used for transformation, in fact only increase by one and become the resistance part part existing stereo radio-tape recorder.
Provide accompanying drawing of the present invention below.
Fig. 1 is a circuit structure schematic diagram of the present invention.
Fig. 2-4 is respectively three kinds of different structure schematic diagrames of the acoustic image expanding element among the present invention.
Provide embodiments of the invention with reference to the accompanying drawings.Elaborate embodiment, ins and outs of the present invention further are provided.
Provide a power amplifier that is used for the binary channels radio-cassette player according to Fig. 1 and Fig. 2.Among Fig. 1, audio frequency amplifier 1 of the present invention comprises the two-path amplifier integrated circuit (IC)
1, corresponding external capacitor C
1-C
8, volume potentiometer W
1, W
2Be connected on IC
1Two acoustic image expanding elements 2 of importing reference edge A and B, wherein, C
2And C
1Be the input coupling capacitance, cross-over connection is in volume potentiometer W respectively
1, W
2Centre cap and IC
1Two inputs.Acoustic image expanding element 2 is by two coupling capacitance C
9And C
10Constitute with change resistance part part 3, and connect C with ' Y ' font
9And C
10Be the head of ' Y ' word, their free end connects with two of audio frequency amplifier 1 input reference edge A and B respectively, becomes the body that drives that resistance part part 3 is ' Y ' word, its free ending grounding.From Fig. 2 as seen, the change resistance part part 3 in the acoustic image widening parts 2 in the present embodiment is by K switch
1And resistance R
1, R
2Constitute resistance R
1With R
2Be in series in a N, resistance R
1The other end and coupling capacitance C
9, C
10Be linked in a M mutually; And resistance R
2Other end ground connection, K switch
1Also ground connection of cutter, it is thrown respectively and connects mutually with a M, N and P, P is unsettled for point, like this, K switch
1When placing position M, capacitor C
9, C
10Ground connection, at this moment, the frequency band of amplifier 1 is the wideest, and gain is maximum, drives loud speaker BL
1, BL
2After, make the people sound that sound source resembles and closely locating K
1When placing the N position, capacitor C
9, C
10Through resistance R
1Connect mutually with ground, because resistance R
1Existence and C
9, C
10Crosslinked coupling, acoustic image is expanded, the frequency band of amplifier 1 is compressed, particularly low frequency end is compressed, gain reduces relatively, it broadcasts effect to sound makes the people feel that sound source image at the middle distance place, works as K
1When placing the P position, capacitor C
9, C
10Through series resistance R=R
1+ R
2Go into ground, acoustic image is further expanded, the frequency band low frequency end of amplifier 1 further by compression, gain further reduces, and makes broadcast effect low-frequency component still less, volume is littler, sounds just as sound source at distant location.In the present embodiment, IC
1Take two-path amplifier integrated circuit TA7240P, input capacitance C
2=C
3=1 μ F, output coupling capacitor C
6=C
7=1000 μ F promote capacitor C
5=C
8=100 μ F, C
9=C
10=1 μ F, K
1Be SP3T band switch, R
1=47 Ω and R
2=150 Ω.Power supply is 13.5 volts.
As the replacement of the foregoing description, acoustic image expanding element 2 is made of Fig. 3.Fig. 3 and the difference of Fig. 2 only are to become inner Join mode different of resistance part part 3, and among Fig. 3, the change resistance part part 3 in the acoustic image expanding element 2 comprises K switch
2, resistance R
3And resistance R
4Resistance R
3And R
4Respectively with capacitor C
9And C
10Common junction S connect resistance R mutually
3The other end be connected to a T, resistance R
4Other end ground connection, K switch
2Cutter ground connection, it is thrown respectively and contact S, T connects mutually with Q, Q is unsettled for point.Obviously, compare resistance R with the foregoing description
3Be equivalent to resistance R
1, and resistance R
4Then be equivalent to resistance R
1With R
2Sum, K
2Be equivalent to K
1
As another replacement of the foregoing description, acoustic image expanding element 2 as shown in Figure 4, difference only is to become the formation of resistance part part 3.Among Fig. 4, becoming resistance part part 3 is potentiometer W.Obviously, as long as the resistance of potentiometer W is equal to or greater than resistance R
1With R
2Sum just can realize audio-visual effects same as the previously described embodiments.From Fig. 4 as seen, the two ends of potentiometer W respectively with coupling capacitance C
9, C
10Common junction connect the arbitrary end short circuit in centre cap and its two ends mutually with ground.
Claims (4)
1. the audio frequency amplifier 1 of a scalable hearing distance is used in particular for stereo equipment, it is characterized in that two inputs have an acoustic image expanding element 2 with reference to termination A and B, and this acoustic image expanding element 2 is by coupling capacitance C
9, C
10Constitute with change resistance part part 3, they connect with ' Y ' type, coupling capacitance C
9And C
10Constitute the head of ' Y ' word, their free end connects mutually with two input reference edge A and B respectively, and what become that resistance part part 3 constitutes ' Y ' words drives body, its free ending grounding.
2. audio frequency amplifier 1 according to claim 1 is characterized in that becoming resistance part part 3 by K switch
1And resistance R
1, R
2Form resistance R
1With coupling capacitance C
9, C
10And resistance R
2Be connected to a M and N respectively, resistance R
2Other end ground connection, K switch
1Cutter ground connection, it throws respectively interface M, N and P, P is unsettled for point.
3. audio frequency amplifier 1 according to claim 1 is characterized in that becoming resistance part part 3 by K switch
2And resistance R
3, R
4Form resistance R
3And R
4With coupling capacitance C
9And C
10Common junction S connect resistance R mutually
3The other end be connected to a T, resistance R
4Other end ground connection, K switch
2Cutter ground connection, it is thrown respectively and connects mutually with contact S, T and Q, the some Q unsettled.
4. audio frequency amplifier 1 according to claim 1, it is characterized in that becoming resistance part part 3 is potentiometer W, its two ends are connected to coupling capacitance C respectively
9, C
10Common junction and ground, centre cap and one end short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90102902 CN1048297A (en) | 1990-07-16 | 1990-07-16 | The audio frequency amplifier of scalable hearing distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90102902 CN1048297A (en) | 1990-07-16 | 1990-07-16 | The audio frequency amplifier of scalable hearing distance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1048297A true CN1048297A (en) | 1991-01-02 |
Family
ID=4877779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90102902 Pending CN1048297A (en) | 1990-07-16 | 1990-07-16 | The audio frequency amplifier of scalable hearing distance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1048297A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320442C (en) * | 2004-03-19 | 2007-06-06 | 威盛电子股份有限公司 | Audio processing circuit and related method |
| CN102647159A (en) * | 2011-02-22 | 2012-08-22 | 苏州阿纳克斯爱酷达电子有限公司 | Audio power amplifier used for urban rail traffic system |
| CN110996238A (en) * | 2019-12-17 | 2020-04-10 | 杨伟锋 | Binaural synchronous signal processing hearing aid system and method |
-
1990
- 1990-07-16 CN CN 90102902 patent/CN1048297A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320442C (en) * | 2004-03-19 | 2007-06-06 | 威盛电子股份有限公司 | Audio processing circuit and related method |
| CN102647159A (en) * | 2011-02-22 | 2012-08-22 | 苏州阿纳克斯爱酷达电子有限公司 | Audio power amplifier used for urban rail traffic system |
| CN110996238A (en) * | 2019-12-17 | 2020-04-10 | 杨伟锋 | Binaural synchronous signal processing hearing aid system and method |
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|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| RJ01 | Rejection of invention patent application after publication |