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JPS56134807

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DESCRIPTION JPS56134807
? a book 1 title of invention
Sound reproduction device
3) Detailed Description of the Invention The present invention relates to an audio reproduction
apparatus, and more particularly to an apparatus capable of reducing as much as possible the
distortion voltage component generated by connecting an amplifier circuit and a speaker by a
connection cord. Heretofore, in the field of 1 m sound equipment, improvements have been made
to the sound reproduction apparatus, that is, the amplification apparatus, the speaker, etc., in
order to perform higher fidelity pre-recorded reproduction. When connecting these speakers and
the amplification device, matching is achieved by setting each impedance in advance [7] as is well
known. However, due to the impedance component of the connection hood that connects the
speaker and the amplification device, the output terminal of the amplification device has
impedance impedance on the speaker side,? The drive impedance of the chair coil is increased
isometrically by VC. This condition is, in the worst case, an impedance mismatch condition. The
counter electromotive force (medium voltage component) VC that is generated from the coil
EndPage: 1 brings about VC ? at the time of reproduction of your book, and the frequency
characteristic, the damper factor, etc. By the way, in recent years, an amplification apparatus has
been considered as shown in FIG. That is, the input terminals IN are supplied to the input
terminals IN-1 and fcf (the writing and reading bow 1tj, the input terminals of the amplification
circuit 14 constituting the amplification section 12 are connected (one power supply (power
supply)). The amplified signal from the fit force ? l1li of this amplification circuit 14 / (Sound
No. 18 is transmitted through the return circuit 10. Of the amplification circuit 14 (?? tt'r, (4+
thread v1 ? ? ? both 1tC, +! Muting switch S1 external output yy 2 oA and impedance
component Z OAI? 'Through the connection code t' 1. ?? 1 positive four input terminals 24A?
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(1J (H 1. 1). ???? On the other hand, the power source for one part which is in a state of
being grounded at one point to the N pole input end 24B of the ground plane J 22; 20B and the
impedance component Z, the connection cord t2 It is 71. The feedback signal is supplied to the
feedback circuit 3o via the connection cord t3 and the Ni return input terminal 28 from the
negative (9 input terminal 24B) of the speaker 22. The feedback signal from this feedback circuit
3o is M! Supplied to the (-) input terminal of the II3 + 2 amplifier circuit 14! ????? In the
figure, the feedback circuits 16 and 30 [[amplifying circuit 14 (/ respectively-(- 1) Operate as a
feedback circuit and an IF feedback circuit, and it is assumed that these feedbacks -iJ and
absolute feedback 11 (i: feedback bi from the negative feedback circuit is smaller than force ++
X'4k 'of stop feedback circuit.
That is, by constructing the amplification apparatus in this manner, even if the connection cord ti,
t2 is a back electromotive force generated from the chair coil at 7 of the E power 22, the
distortion, ie, the distortion knowledge pressure component is generated via the connection cord
t3. After being supplied to the feedback circuit 30 by 1 ░, it is supplied as an amplification
circuit 14ic feedback signal 6 '+-i. Thus, the speaker 22 obtains a good life condition with
improved wrinkles, and is used in such an amplification device, i. 1- or 1- In such a moat V'C, in
order to obtain the effect described above, connect the ? feedback 1 4 path 30 il 11) ? Code
11.12 ? ( The variable control i11'-J 'must be I?. This "invented", Sat 8 [) small и j t t ? C ? ?
1 ? ? ? ? ? ? ? ? ?, the number of layers of speakers or a single connection code ?-h, k
c N of Of the amplification unit 1 dairy,-force or beef noise from the other speaker, the other or
one ? speaker) microphone drive 1-by the connection cord in the direction to cancel the 1000
voltage component appeared by the connection cord It is an object of the present invention to
provide an acoustic endo device which reproduces a good moon vigor sound by internally
accumulating the benefits of a gain type feedback circuit. Hereinafter, an embodiment of the
present invention ?) will be described with reference to the drawings. In FIG. 2, this device is
constituted by first and second amplification devices. The input terminal IN is connected to the
first end of the amplification device 34, and the tip end of the amplification circuit 34 in the # ?
amplification unit 321. The output terminal of the amplifier circuit 34 is connected to the
external output terminal 201 and to the input terminal of the feedback circuit 360. This feedback
circuit ,? "t; r, J part 1" end is connected to the C) input end of the force 19 width circuit 34 to
form a negative feedback circuit. Then, the external output end 201 and the output end 202 in
the ground state each have a pair of impedance components Z shouldered by the connecting
cords 11. The first Q '+ speaker 22! The positive phase input end, ie, the positive pole input end
24, as well as the negative phase input end, ie, the negative pole input end 242 VC
corresponding connected Zl. In this back, the negative input terminal 242 to which the
connection cord t2 is connected passes through the connection cord t3 and the amplification unit
32. Are connected to the feedback input 281 of the The feedback input terminal 28 ? is
connected to the variable gain type first feedback circuit 501 input terminal. The output end of
the first seven feedback circuit 501 is connected to the ? input end of the amplification circuit
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34.
On the other hand, the second amplification device 312 has the same configuration as the first
amplification device 321. That is, the input terminal N2 is connected to the input terminal of the
amplification circuit 34 EndPage: 2 in the amplification section 322. It is connected to the input
terminal of the amplifier circuit 34. The output end of the amplification circuit 34 is connected to
the input end of the feedback circuit 36 and connected to the external output end 2?3.
Hereinafter, in the same manner, the output terminal r of the # feedback circuit 36 is connected
to the Q input terminal VC of the amplifier circuit 34. Ten i14. If the external output end 203 and
the positive output end 243 of the external output end-force 222 in the ground state are
connected to the negative input end 244, the negative input end 244 to which the connection
cord t5 is connected is The connection code t6 is connected to the input end of the variable gain
type second feedback circuit 502 through the feedback input end 282 of the amplification
section 32 ?. The output terminal of the second feedback amplifier circuit 502 is connected to
the input terminal of the amplifier circuit 34. With this configuration, the feedback amount of the
first feedback amount K50 + of the first amplifying device 311, that is, the feedback gain amount,
is set to a predetermined value. The case of performing iI adjustment will be described. First, the
first and m2 speakers 221 and 222 are made to face each other. Next, among the positive and
negative input terminals 24 ? and 24 ? of the first speaker 22, a voltmeter such as a pulgel vO
having a very high input impedance is connected at 1?. On the other hand, the signal end N2 VC
signal #Is of the second amplification device 312 is connected. The second speaker 22! Is
supplied with a signal such as a voice or a tone, for example, at the input end IN. Make the
playback sound from. A so-called microphone is driven by vibrating the first speaker 221 and
cone paper (not shown) by the reproduced sound generated by the second spill force 222. If this
is done, the counter electromotive force generated between the positive and negative input
terminals 24 ? and 242 of the first speaker 221 while driving the second speaker 222 will be as
close to zero as possible. The first feedback circuit 50. Use the gain of the control side j. Thus, the
first feedback circuit 50. What is the feedback amount of the connection cord ti, tzvc by the
amplification part? 21 and the first speaker 22r are in a state of being surely matched. 1. ?k, the
positive and negative input terminals of the first speaker 22 ? 24. . There is no frequency
characteristic, a ? force that worsens the damping factor, and a pressure component t2 between
242.
This state is specifically vcHH described using FIG. FIG. 3 shows the device of FIG. 2 in the
evaluation circuit. Second speaker 22. Impedance r11. f, it is in a closed circuit state with the
acoustic output voltage el of the second speaker 222; On the other hand, the acoustic output
voltage from the second speaker 22 ?): , First speakers 22. At the transmission coefficient K
(fc.1> K) ffl, and the first speaker 22. The impedance component zO is in a closed circuit state as
viewed from the impedance portion r2 of the second embodiment and the positive and negative
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electrode input terminal "++ 242". Among these, the impedance ZO is the first feedback circuit
50! It is expressed by a gain function (temporarily set as .beta.) Of T.sub.Z = f (.beta.) (1) and a
table -Jf]. And the voltage V of the impedance ZO is V = i?20 иии (2) K'eiro ? Z. ????????
????? Here, if 20 in the above-mentioned equation (1) is exchanged by ? and 61 persons
make it zero, the voltage V becomes ? и O и (3). On the other hand, by setting v o, ZO O O ? и и
(4) waits. Thus, the first feedback circuit 50. Controlling the gain of the first speaker 22. Since
the distortion voltage components that deteriorate the frequency characteristics, damping factor,
etc. between the positive and negative Th pole input terminals 24 ? and 24 ? are small by a
factor of Hv, It's something that can be added to the tube's faithfulness Ik's strength. Further, in
the case of controlling the curvature of the second feedback circuit 502 in the second
amplification device 322, a signal such as a note, a music, etc. is supplied to the input end of the
first amplification device 321. After the second speaker 222 is driven by the microphone, it is
preferable that the voltage between the positive and negative input terminals 243 and 244 of the
11: 2 speaker 222 be as zero as possible. In addition, since this detailed description i (+, is the
same as that described above, it is omitted. Therefore, regardless of any connection cord, the
distortion voltage component can be reliably and easily canceled, and the user can freely select
and set the connection. In the embodiment of the present invention r (wherein the signal 6s has
been described using speech, musical tone, etc., but the long-term continuous output type even if
it is a sine wave,..., Cels wave, #i! It is hopeful to use l-tooth waves. Also, the first and second
feedback circuits 50. . In the case of 5? 2, it is desirable to provide a valley 8 V (a convex work
control side [allowing a VC operation to be performed or a real flat l / C.
In addition, various modifications are possible without departing from the scope of the present
invention. As described above in detail, according to the present invention, among the plurality of
amplification circuits in which the speaker of the present invention is connected by a pair of
connecting cords,-power or a meridian from the other speaker, the other speaker or one speaker
By adjusting the gain of the n) variable gain type @ feedback circuit of the 111 amplifier circuit
in the direction to eliminate and eliminate the distorted voltage component expressed by the
connection cord by driving the microphone, a good internal sound without distortion can be
obtained. It is possible to provide a highly reliable sound reproduction apparatus that reproduces
sound.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a conventional widewidth apparatus, FIG. 2 is a circuit diagram showing an embodiment of an audio reproducing
apparatus according to the present invention, and FIG. 3 is FIG. FIG. 18 is a 1gl path diagram
showing an equivalent N path of the sound reproduction device of FIG. 221: first speaker, 222:
second speaker, 32. . 322 и и и first and second amplification devices, 36 ... feedback circuits, 50. .
502... First and second feedback circuits, t1 to t6... Connection cords. Applicant i (Embedded
patent attorney Suzu 21 Musashi 1 figure, 121EndPage: ?
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