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JPS5393014

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DESCRIPTION JPS5393014
Description 1, title of the invention
Speaker device
3. Detailed Description of the Invention 1. The invention relates to a speaker apparatus provided
with a speaker network circuit for attenuating a peak at a high frequency limit frequency which
occurs in a speaker output sound pressure frequency characteristic. In general, the "output sound
pressure frequency characteristic of the speaker has a peak such that the output sound pressure
increases at the high frequency limit frequency, as shown by a broken line in FIG. 1, for example.
And the sound radiated from the speaker having such a characteristic will be an aurally
undesirable sound due to the peak generated in the above-mentioned output sound pressure
frequency characteristic. Therefore, in order to improve the audibility by attenuating the peak
that is generated conventionally in the speaker's output sound pressure frequency characteristic,
for example, a speaker comprising a low end filter having a transmission characteristic of 12 dB
10 CT as shown in FIG. A speaker device that is provided with a network circuit and configured
to supply the input signal to the speaker by operating the speaker network circuit is generally
used. Here, the speaker network circuit provided in the conventional speaker has a coil 3 and a
capacitor 4 connected in series between the signal input terminals 1 and 2 as shown in FIG. The
voice coil 6 of the speaker 5 is connected in parallel between them so that fHl> fc fist 11 @ (3)
EndPage: 1 +1 each (1), (2), (3) The inductance L1 of the coil 3 and the capacitance C1 of the
capacitor 4 are determined to obtain a transmission characteristic of 12 dB10 CT. In the above
equations, NROl is the resistance value of the voice coil 6 of the speaker 5, fcd is the cut-off
frequency of the low-pass filter constituting the speaker network circuit, and fHl is the highrange frequency limit of the speaker 5 is there. Then, by using the transmission characteristic of
12 dB 10 CT of the above-mentioned speaker ? network circuit, the output sound pressure in
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the vicinity of the high frequency limit frequency in the output sound pressure frequency
characteristic of the speaker 5 is attenuated. However, in the conventional speaker / network
circuit gold-proportioned speaker apparatus as described above, the output sound pressure in
the vicinity of the high limit frequency f old is simply attenuated by the above-mentioned
transmission characteristic of 12 dB 10 CT. As indicated by the alternate long and short dash
line, a peak remains at the high frequency band limit frequency fH1 in the output sound pressure
frequency characteristic of the sound radiated from the speaker 5. Even if the sound pressure
level at the pressure peak is lowered by about 40 dB in the mid-range range, the audibility is a
problem.
Therefore, conventionally, in order to eliminate the peak of the output sound pressure at the
above-described high frequency band limit frequency, a resonance capacitor 7 (one point in FIG.
3) is further added to the speaker network circuit as shown in FIG. It shows by a dashed line. ) All
the coils 3 are connected in parallel, or the resonance coil 8 (shown by a broken line in FIG. 3). )
Connect all capacitors 4 in series so that the parallel resonance frequency by the resonance
capacitor 7 or the series resonance frequency by the resonance coil 8 becomes equal to the high
limit frequency fH1 of the speaker 5 In the case where the above-mentioned speaker 5 is a
current drive type (normal dynamic speaker), the drive current is reduced at the above high
frequency limit frequency fH1. By the way, in such a configuration, since the resonance capacitor
7 or the resonance coil 8 is added, the number of component parts is not only increased, but
when the above-mentioned resonance capacitor 7 is added, Since the signal input terminals 1 and
2 are short-circuited in the high frequency region by the resonance capacitor 7 and the capacitor
4, an output amplifier (not shown) for supplying an input signal between the above signal input
terminals 1 and 2 In addition, if the above-mentioned resonance coil 8 is added, a large current
flows in the coil 3 and the resonance coil 8 at the series resonance frequency, so heat generation
is extremely undesirable for disaster prevention. Furthermore, in order to eliminate such
drawbacks of the prior art, the circuit configuration of the speaker network circuit has to be
extremely complicated. SUMMARY OF THE INVENTION In view of the drawbacks of the prior art
as described above, the present invention has a simple structure without causing shorting
between signal input terminals and causing a large current to flow to each component. The
present invention provides a speaker device provided with a speaker network circuit which can
eliminate the peak of the output sound pressure at the high frequency band limit frequency.
Hereinafter, the present invention will be described in detail with reference to the drawings
showing an embodiment. FIG. 4 is a circuit diagram showing an embodiment of the present
invention. In the figure, the speaker 15 is confirmed by calculation or measurement of the
inductance Lsp (including the portion due to the magnetic circuit) of the voice coil 16 and the
high frequency limit frequency fl (of the voice coil 16). The voice coil 16 of the speaker 15 has
one end connected to one of the signal terminal 11 via the coil 13 and the other end connected
to the other one signal power terminal 12.
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Furthermore, a resonance capacitor 14 is connected in parallel to the voice coil 16 of the speaker
15 described above. Here, EndPage: 2 so that the parallel resonance frequency with the
inductance LSP of the voice coil 16 of the speaker 1 j becomes equal to the high frequency limit
frequency fH of the speaker 15. It is determined to satisfy the following equation (4). Then, the
impedance Z (f?) at the high frequency band limit frequency fH viewed from both ends of the
parallel resonant circuit composed of the voice coil 16 and the resonant capacitor 14 of the
speaker 15 is expressed by the following equation (5). The above-mentioned inductance L?P
and capacitance cN are determined so as to make the parallel resonance frequency of this
parallel resonance circuit equal to the high limit frequency f) 1 of the above speaker 15. Here, RO
in the above equation (5) is a resistance value of the voice coil 16 of the speaker 15. Then, since
the impedance Z (fH) (1 '!) Becomes infinite if the resistance value go of the voice coil 16
becomes zero, the voice coil rH of the speaker 15 becomes zero. -Therefore, the above-mentioned
high limit frequency fl (the current flowing through the voice coil 16 is determined by the
resistance Ro of the voice coil 16 described above, and this resistance RO is determined in the
design of the voice coil 16, Furthermore, the damping resistance can be arbitrarily determined by
connecting in series to the voice coil 16 or the resonance capacitor 14 described above.
According to the embodiment as described above, as indicated by the solid line in FIG. 1, the
output sound pressure may have a peak at the high frequency limit frequency fH, and the
speaker 15 may emit a sound extremely preferable for hearing. it can. In the above embodiment,
not only the number of component parts is very small but also the economy is good, the coil 13
and the parallel resonant circuit (the voice coil 16 and the resonant capacitor 14) are disposed
between the signal input terminals 11.12. It consists of Since the components are not shortcircuited even in a high frequency region and the components are not heated by a large current
since they are connected via a series connection circuit with the above, it is preferable in terms of
disaster prevention. As described above, according to the present invention, since the resonant
frequency of the parallel resonant circuit formed by the capacitor and the voice coil of the
speaker is equal to the cylinder area / limit frequency of the single force, the high frequency limit
described above It becomes possible to radiate a hearing-soundingly desirable sound from the
speaker without causing a peak in the output sound pressure at the frequency.
Furthermore, since the input signal is supplied via the coil connected in series to the abovementioned parallel resonant circuit, the signal input terminals are short-circuited in the high
frequency region, and a large current flows in the component to heat it. It is possible to provide
an arithmetic speaker device with an extremely simple configuration, which is favorable for
disaster prevention without any problems. Therefore, the intended purpose can be achieved
sufficiently.
4 is a characteristic diagram showing output sound pressure frequency characteristics in the
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conventional example and the embodiment of the present invention, in which the broken line is
by the speaker alone, and the alternate long and short dash line is the conventional speaker
number. The solid line indicates a speaker device provided with a network circuit, and the solid
line indicates one according to an embodiment of the present invention. FIG. 2 is a characteristic
diagram showing transmission characteristics of the speaker network circuit provided in the
conventional speaker device. FIG. 3 is a circuit diagram of a speaker device 6 provided with a
conventional speaker network circuit. FIG. 4 is a circuit diagram showing an embodiment of the
present invention. 11.12 иии Signal input terminal 13 и Coil 14 и и и Capacitor for resonance 15 иии
Speaker 16 иии Voice coil for speaker Patent applicant Sony Corporation Attorney Attorney Kosuke
Satoshi EndPage: 3 Fig. 1 2m "Coloco 41st EndPage: ?
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