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JPS52130624

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DESCRIPTION JPS52130624
Description of the Invention Dynamic Excitation Dynamic Speaker Pulse Code The pulse current
constituting each signal of the modulation signal is continuously supplied to the voice coil or
excitation coil of the speaker and the sawtooth current which changes exponentially is A passive
dynamic speaker characterized in that the excitation coil or the voice coil is flowed and the pulse
constituting each pit signal of the pulse code modulation signal is weighted according to the bit
thereof. .
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a separately
excited dynamic speaker, and more particularly to a turtle that attempts to reproduce a pulse
code modulated signal without digital-to-analog conversion. In general, the pulse code
modulation signal is characterized in that the original signal can be faithfully reproduced even
when using a low quality transmission path to which only the presence or absence of the signal
can be transmitted. Conventionally, when this pulse code modulation signal is regenerated,
digital-to-analog conversion is performed, and then regeneration is performed. At this time, noise
mainly occurs in the digital-analog conversion stage, and advantages in transmission of the pulse
code modulation signal are Decrease. In view of the foregoing, it is an object of the present
invention to provide a separately excited dynamic speaker capable of reproducing a pulse code
modulation signal without digital-to-analog conversion. An embodiment of the passive dynamic
speaker according to the present invention will be described below with reference to the
drawings. In FIG. 1, (1a) is an input signal supply terminal and supplies a pulse signal as shown
in FIG. 2A to this input signal supply terminal (1a). In FIG. 2A, the symbol is a synchronization
signal, the symbol ■ is a polarity discrimination signal, and the symbol パ ル ス is a pulse code
modulation signal consisting of, for example, 3 bits. The synchronization signal (1), the polarity
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determination signal (2) and the pulse code modulation signal (1) constitute one word of the
input signal. (1) is a sync separation circuit. This sync separation circuit +11 separates the pulse
signal supplied to the input signal supply terminal (1a) from the sync signal, the polarity
discrimination signal 1 and the pulse code EndPage: 1 modulation signal IK. Then, the
synchronization signal I is supplied to the monostable multivibrator (2). The monostable
multivibrator (2) falls with this synchronization signal as shown in FIG. 2B and generates a pulse
voltage which rises at the end of one word of the pulse signal, and the pulse voltage is used as a
power amplifier. It supplies to the both ends of the exciting coil (5) which comprises an
electromagnet (4) via (3). As a result, the waveform of the current flowing through the exciting
coil (5) is integrated by the inductance and resistance of the exciting coil (5), and the falling
portion thereof decays exponentially as shown in FIG. 2C. On the other hand, a bobbin (81)
connected to a cone (7) is provided so as to surround the center ball (6) connected to the
electromagnet (4), and this cone (7) together with the bobbin (8) is shown in FIG. It is designed to
be able to move with a predetermined degree of freedom in the direction of the arrow inside. And
this bobbin (8) v is provided with a voice coil (9). このボイスコイル(9)Kt! A pulse code
modulation signal {circle over (1)} whose polarity is determined by the polarity determination
circuit Q1m− is supplied from the synchronization signal separation circuit fil via the power
amplifier aυ.
Here, when the power amplifier αυ is in the “1” state and the Japanese Patent Application
Laid-Open No. 52-130624 (2) is in the “1” state, the power amplifier α 変 調 responds to the
noise coil modulation signal When the pulse current is supplied and the bipolar discrimination
signal ■ is in the f'0 "state, the pulse current according to the noculus code modulation signal I
is made to flow in the direction opposite to the above direction of the voice coil (9). The direction
of the driving force generated at the time of switching is switched depending on whether the
polarity determination signal is in the "1" state or in the "0" state. Generally, in a separatelyexcited dynamic speaker as shown in FIG. 1, it is proportional to the product of the current
flowing in the exciting coil as shown in FIG. 2C and the current flowing in the voice coil as shown
in FIG. A driving force as shown in the second plan is generated. For this reason, the pulse signal
modulated by the noise code is weighted from 22 @ 1 to 1 @@ from the upper bit. Here, since the
force in the time of one word in which there is a bi-equal pulse code modulated pulse is
integrated to drive the cone (7), the pulse code modulated pulse is demodulated and added to the
cone (7) . In this invention, the separately excited Dide-mix speaker is supplied with a voice coil
(9) K and pulse code-modulated pulses supplied to an exponentially varying sawtooth current allexcitation coil (5). Since these pulses are weighted according to the bit, the pulse code modulated
waveform can be supplied to the speaker without digital-to-analog conversion to drive the
speaker. In the above embodiment, the polarity is determined by the polarity determination
circuit aO in the voice coil (9), and a pulse code modulated pulse current is supplied to the voice
coil (9) to change exponentially in the exciting coil (5). The same action and effect as described
above can be obtained by supplying a wave current, but supplying a sawtooth current that
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changes exponentially to the voice coil (9) and a pulse code modulated pulse current to the
excitation coil (5) It will be easy to understand. The case of reproducing a stereo signal as an
application example of the separately excited dynamic speaker as described above will be
described according to FIG. In FIG. 3, parts having the same functions as those in FIG. 1 are given
the same reference numerals and their detailed description will be omitted. The input ladder (1'a)
of the sync separation circuit il + shown in FIG. 3 comprises the sync signal Ia, the polarity
determination signal 1a and the 3-bit pulse code modulation signal 18 as shown in FIG. And one
word of the pulse signal for driving the speaker on the right, and one word of the pulse signal for
driving the right speaker composed of the synchronization signal Ib, the polarity determination
signal 1b and the pulse code modulation signal Wb of 3 bits Provide a superimposed pulse
signal.
Then, the synchronization separation circuit (the synchronization signal divided by 11 is supplied
to the flip-flop circuit α. The normal output voltage of the flip-flop circuit aa is a pulse train
rising at the synchronization signal Ib as shown in FIG. 4B and falling at the synchronization
signal processing a, and the inverted output voltage is as shown in FIG. The rising edge is a pulse
train that falls at the synchronization signal Ia and the falling edge at the synchronization signal
Ib. When the normal output voltage of the flip-flop circuit a is supplied to both ends of the
exciting coil (5m) through the power amplifier (3a), the current flowing through the exciting coil
(5a) is as shown in FIG. 4E. When the reverse output voltage of the flip-flop circuit is supplied to
both EndPage: 2 ends of the exciting coil (5b) through the power amplifier (3b), the current
flowing in the exciting coil (5b) is as shown in FIG. become. On the other hand, the pulse code
modulation signal Ha or the signal is supplied to one input terminal (13a) on the channel
switching circuit side, and the other input terminal (13b) of the channel switching circuit α is
inverted output of the 7-rib 70-tub circuit a2. When the inverted output is in the "1" state, the
pulse code modulation signal whose polarity is determined by the polarity determination circuit
(10a) is conducted between the input terminal (13a) and the output terminal (13c) and the power
amplifier Feed to the voice coil (9a) of the left speaker via (lla). When the inverted output is in the
"O" state, the pulse code modulation signal determined by the polarity discrimination circuit
(10b) is conducted between the input terminals (13a) and (13d), and the pulse code modulation
signal is detected through the power amplifier (llb). The voice coil (9b) K of the right speaker is
supplied. As described above, when signals are respectively supplied to the excitation coil and
voice coil of the separately excited dynamic speaker, the pulse code modulation signal 1a is
weighted as described above, and the left separately excited dynamic is generated with the
driving force as shown in the fourth factor F. Drive the speaker. The pulse code modulation signal
1b is also weighted as described above to drive the separately excited dynamic speaker on the
right side with a driving force as shown in FIG. Therefore, as described above, the stereo
broadcast signal can be reproduced by the separately excited dynamic speaker connected to-in
FIG. The present invention is not limited to the above-described embodiment, and various other
configurations can be adopted without departing from the scope of the present invention.
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Brief description of the drawings
Claims
The first □□□ is a block diagram showing one embodiment of the separately excited dynamic
speaker of the present invention, FIG. 2 is a diagram for detailed explanation of the present
invention, and the third meat is an application example of the separately pumped dynamic
speaker of the present invention FIG. 4 is a connection diagram shown, and FIG. 4 is a diagram
for explaining FIG. (1) is a synchronous separation circuit, (2) is a monostable multivibrator, (5) is
an excitation coil, and (9) is a voice coil. Patent applicant Sony Corporation Atsushi Ito 1.6)EndPage: 3
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