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DESCRIPTION JPS58142608

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DESCRIPTION JPS58142608
[0001]
The present invention relates to a novel audible (yB wave number band (ortho frequency band)
reproduction system and its apparatus. Conventionally, lll 'l [tj4. In order to reproduce the i
frequency, an audio band frequency signal obtained from a record player, a tape recorder, an FM
or AM receiver is amplified by an amplifier, and then amplified. Driven in the audio frequency
band only: a sound transducer designed in a manner such as an input 1 to an electrodynamic
speaker, 12 conversion of electrical 'IK' 3 into mechanical vibration 12, thereby a closet of air
Sound 1) and 1- listen 1-. In this upper conventional reproduction means, a large-aperture
diaphragm is provided to reproduce the low-pitched range in the above-mentioned '4 sound
transducer, and a small-aperture diaphragm is provided to produce a force high-pitched range.
There is a contradictory requirement that it was impossible to reproduce 0Tl [ti frequency band
1 or 201-1z to 20 KHz with a single speaker at a uniform power level. However, so-called multiway speakers, which have at least a speaker for bass reproduction and a speaker for treble
reproduction, are often used. Father, in such a conventional reproduction system, the acoustic
transducer changes directivity depending on the reproduction frequency to give a sense of
discomfort to the listener, and in history the nonlinearity of the acoustic converter, for example,
the edge supporting the diaphragm, Distortion due to odd harmonics occurs in the reproduced
sound due to the non-linearity of the damper etc. The present invention is a reproduction method
and its device conceived from a completely different point of view from the conventional
reproduction method described above, and an electric signal of an ultrasonic band amplitudemodulated by an audio frequency band electric signal is An ultrasonic acoustic transducer having
an input / output characteristic that is non-linear, for example, a square characteristic. The
present invention is a reproduction system and its device in which the conventional drawback is
completely eliminated. The system of the present invention will be described in more detail along
with its reproduction device (7). Fig. 1 (The first device to implement the playback method of the
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present invention, in the figure 1 is a human power terminal to which an audio frequency band
electrical signal (20 Hz to 20 KHz) should be input, usually a record player, tape recorder, FM Or
connected to the output (not shown) of the AM receiver. An amplifier may be connected between
the output end and the input end 1 as required. An amplitude modulator 2 is a common
amplitude modulator having 141 such as a collector modulation 1il path. 3 is a carrier electric
signal generator-), and the oscillation IN wave number is preferably an ultrasonic frequency band
of 40 KHz or more, which is 7 at 60 KHz in this apparatus.
This carrier wave generator also uses a known oscillation circuit. An amplifier 4 must be able to
amplify at least the frequency band of the amplitude modulator output signal. An acoustic
transducer 5 has non-linear input / output characteristics, for example, a square characteristic,
and is preferably an acoustic transducer such as an electrostrictive type, a non-biasing capacitor
type, or a magnetostrictive type. It is necessary to be able to regenerate the band. Next, 1-, in the
configuration, assuming that the angular frequency of the carrier wave is ?C ((IJc = 2?fc: fc =
60 KH2) and the angular frequency of the audio frequency signal input to the input terminal is p,
the signal is Vcospt (V is the amplitude The carrier is represented by Vocos 6Jct (VO is the
amplitude). Therefore, the output of the amplitude modulator 2 can be expressed as V (11 = V,)
(1 + m cos pt) cos ? cj (Equation 1) where m is the degree of modulation and is represented by
m?v, 'vO Be 11JV (1) = VOSin?ct ? + ? 1 // 2 + TIVOCOs (?c + 1)) t?1?2mV (1 cos (?c?p)
t? =... (Expression 2), that is, the carrier wave An amplitude modulation signal is obtained which
includes side bands of ((= lc / 2.pi.-1) 72.pi.) And ((Nc / 2.pi. + p / 2.pi.) On both sides of
(.omega.C / 2.pi.-60 KHz). In fact, the lower side band is 40 KHz to 59.08 K11 z because r) / 2?
is a band of 2 ? ? to 20 KIIz. The L sideband has a bandwidth of 60.02 KIIz-80 KHz. Thus, the
amplification bandwidth of the amplifier 4 requires 40 KHz to 80 KHz. Then, the amplitude
modulation signal amplified by the amplifier 4 is a constant determined by the acoustic
converter, where the general formula ?-aQ + alv + a2v2 + a3yFl +++ и ++++ (Equation 3) (where,
?ao, a11a2.). Is an acoustic transducer having non-linearity such as ?-aIv-1a2 v2 иииииииииииииииии
(Equation 4) Input to the Thus, the output displacement ? (one sound) of the acoustic transducer
is expressed by ? = J (VO (l + m CO 8 pt) cos ?ct 1 82 (Vo (1 + m cos pt) cos ? ct) 2 and the
expression is expanded Then, ? = ai V, CO 8 ?t + a 1 VOm cos pt cos ?t A?a 9 vo (cos 2 ?ct)
/ 2 ? ?a 2 m Vo cos 2 ?ct CO 8 pt -1-a 2 vti ? CO 8 l) t + a 2 V, F 2nd CO 52 ?ct CO 52 pt /
4 + 82 m 2 ? o 2 CO 821) t / 4. + Ap m2 V # CO 32 (z j (j / 4 + a 2 V j (m 2 + 2) / 4) ........... (Eq.
5) other than the fifth, seventh and ninth terms in the formula Is an ultrasonic region that does
not sound like human's :: because it contains ? C (carrier angular frequency), and the ninth term
is a term that does not depend on human frequency since it is a constant bias displacement.
It is a2 V (j 'cos pt acid component of the fifth term) and a 2 V (j m 2 cos 2 pt acid component
only of the seventh term) that are actually heard in the case of-or-. That is, only the fundamental
wave component and the second harmonic wave component of the input audio frequency
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electrical signal can be taken as the acoustic wave J (1,. And, the second harmonic component is
1 (2 (m <1. Since I VC is an example, the level is small compared to the fundamental wave
component, and even in the case of m = l, even-order harmonic components are more audible
than in the odd-order harmonic components. There is no problem in practical use 1-because it is
confirmed that the influence to be given is small. According to the present invention and
apparatus, a conventional acoustic transducer reproduces a frequency band of 20 tlz to 20 KHz,
which is an audio frequency band. If you try to do so, it is necessary to reproduce at an equal
output level, and it is almost impossible to do so, but in the present invention, the frequency band
of 40 KHz to 80 KHz when the carrier frequency is 60 KHz. Since it is sufficient to reproduce one
octave, the installation N-1 of the acoustic converter is extremely simple, and a narrow
reproduction band enables easy design of a highly efficient converter. In addition, since the
cross-talk converter that reproduces such an ultrasonic band is small in shape, the change in
directivity due to the change in frequency is small. In addition, in the case of the blue-blue
converter, a plurality of transducers may be arranged in the form of an F plate surface, a curved
surface, or a spherical shape ((arrangement may be made to obtain necessary sound pressure
levels. It is very easy to design a high efficiency amplifier because it is only necessary to amplify
a band of about 1 octave as described in Af7. When a non-biased content type transducer is used
as the acoustic transducer, al = Q in the above equation 4 and therefore the first, second and
third terms are eliminated in equation 5, but as a result, the fifth term And the seventh term
component is listened to by d Ding @ sound and 17. In addition, in the magnetostrictive
transformer, it is necessary to drive the current. Next, a second apparatus for implementing the
present invention regeneration system will be described. In FIG. 2, 21 is a town 1 voltage
frequency electric input terminal similar to FIG. 1, and the audio frequency electric frequency old
from the input terminal is a portable 11 transmission suppression IE both sides band modulation
wedge 22 using a ring modulation circuit etc. Enter J). The carrier wave electric signal (Vg CO 8
cr circle t: C ') (/ 2? = 60 K O 2) outputted from the general transmission wave generator 23 is
manually input to the carrier wave suppression double sideband modulator, Amplitude
modulation is performed at a 5? listening frequency V CO8I) t, or one carrier wave is removed,
and a signal (m cospt-cos?ct) with only both sidebands can be output.
On the other hand, prior to the synchronous carrier generator 23, the carrier carrier signal input
to the double-side carrier modulator for carrier suppression 1 and ?M: 1. Synchronous carrier
electric signal (VCoss ?ct)? together with the signal of only the double sideband. The two
signals are input to the amplifier 24 and amplified by Ill1 and amplified and output. The output
signal is input to, for example, a non-bias capacitor type acoustic transducer 25 having a square
characteristic bounded by ?-a2v ". In the history of the operation described in the history, both
sides of the band are represented by mVocos pt-cos?ct, and the same 1?1 carrier wave input to
the amplifier 24 is represented by ? cCO5?Ct. Therefore, the manual power signal 3 of the
acoustic converter 25 is V (11 = Ill VoCO 8 pt cos ?ct 10 Vc CO 8 ?t. Therefore, the acoustic
output is ? = a2 (n1VoCO5I) 1C (1s (clcl + ?Vc cos ?ct) 2W (= a2 fm ? ? voCoS21) t
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C082?ct + 2ynVQ VtCO5pt C082 # t1- ? ccos2?ctl ... It is represented by (Expression 6). Since
the first and third terms in the L equation 6 are ultrasonic bands, they can not be heard by
human fi-. Then, considering the second term, 2a2mVgV, cosptQcos "?ct = 2a2n1V (I VCCO 8pt
(C (Is 2 ?ct + t) = 2a2mVoVccOs pH-2a2mVpH-2a2 pt-cos 2?ct) 7) 1-In equation 7, the second
term in the equation 7 is an ultrasonic band, so it can not be listened, so that the output
component of the audio frequency band of the first term can be heard as an acoustic output. The
apparatus of this configuration obtains the same effect as that of the first apparatus shown in
FIG. 1 (in addition to the fact that two solid components are not generated, it is possible to
further improve the reproduction. In this configuration, the synchronous carrier signal and the
double sideband signal are added in the amplifier, but after the synchronous carrier signal is
amplified to the required level through another amplifier [7], it is directly added together with
the above-mentioned double sideband signal. Human power may be added to the acoustic
transducer (by. FIG. 3 shows a third apparatus for implementing the reproduction method
according to the present invention, in which 31 is an input terminal of an audio frequency
magnetic wave (V (: 08 pt)), 32 is Ss r3 modulation 2 and the same carrier wave is used. Carrier
electric signal ke (VOCO5?C1: (I) C / 2?-60 KHz) input from the generator 33 is amplitudemodulated by the town 1 voltage frequency electric signal and the carrier component and the L
side band are removed and the lower side band Only the signal is output and input to the
amplifier 34.
On the other hand, a synchronous carrier electric signal (V, cos C ++ ct) synchronized with the
carrier signal input to the SSB modulator 32 is input to the amplifier 34 together with the lower
sideband and is added and amplified. The output of the amplifier 34 is input 17 to a non-biased
capacitor type acoustic transducer whose displacement ? is represented by ??a 2 ? 2 with
respect to the input Ichikawa V, 1 to further explain the above operation. The electric signal
input to the acoustic converter 35 is 4 V (11 = 1/2 m Vll CO 5 (? c -p) t + V Coss ?ct) because it
is represented by / 2 m Vo CO 5 (? ct-pt). The output displacement ?? of the acoustic
transducer, ie, the acoustic output, is ? = 32 ('/ 21 TIVOCO 8 (? c I)) t + Vccos ? Ct) 2 = 1. / B32 m "V (i 'cos 2 (? c p) t + 1/20 a 2 V o Vcc Cos pt + 1/2 o a 2 m V o V c cos (2 ? c-p) t + 172,
a 2 y, j CO 82 ? c t + 1 / Bag (m" V o + 4 V c) Be pityed. In ? 8, 1st, 3rd and 4th terms are
ultrasonic components, so 1 can not be reduced, and 5th term is a constant bias displacement
not related to the input frequency, so that the 2nd term '/ 232m VOVCross pt acid component
can be heard as audible sound. This device can further narrow the amplification bandwidth of the
amplifier to 1, which directly incorporates the effects of the second device. That is, according to
this apparatus, the band of the input signal input to the amplifier may be the amplification band
at 40 KI-IZ which is the lower limit of the lower sideband signal to 1560 KHz which is the
synchronous carrier signal frequency. As with the second device, it is easy to set up an amplifier
with extremely high amplification factor. Also in this device, as in the second device, general
transmission cCO5 (0ct is not input to the amplification 2334, other amplification 8 etc. It may
be calculated for the human acoustic transducer 35 directly via the interface 1--. As described in
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the following 1-, according to the present invention, the carrier electric signal of 1-superza even
is subjected to width modulation with town 1 @ circle number electric signal, and the input /
output characteristics of the amplitude modulated wave signal are nonlinear. In one's hand to the
sound converter. Corresponding to the input audio frequency signal 1- output output TI] audiovisual audio-sound-producing birth system and its device 7-(1, H; j, sound converter and amplifier
is much narrower than conventional one Since it is only necessary to perform band amplification
and amplification, high efficiency, high amplification level acoustic transducers and amplifiers
can be used, and the design of such i-isotube transducers and amplifiers is extremely easy, and
acoustic conversion is also possible. Although it was small in size, it became possible to have both
audio frequencies in the low to high 1A range, and it was impossible to achieve it at all in the
case that the directivity hardly changes in the human frequency range. Effective lA4 '1, g.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a first circuit for implementing the present invention, and FIGS. 2 and
3 are block diagrams of the second and third circuits.
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