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JPH02274097

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DESCRIPTION JPH02274097
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device used for video equipment, audio equipment and systems. 2. Related Art
Conventionally, a loudspeaker of this type has a configuration as shown in FIG. In the
configuration of the speaker device of FIG. 3, an analog audio signal is input to the input terminal
30, and the speakers 33. 34 of the speaker unit 32 are driven through the power amplifier circuit
31. Problems to be Solved by the Invention In such a conventional configuration, it is difficult to
obtain a high quality voice signal because the sound and voice signals from the audio equipment
and the system are analog signals, and it is difficult to obtain a transmission path. Noise and
nonlinearity, and the characteristics of the audio signal are likely to deteriorate. Therefore,
according to the present invention, high-quality sound can be obtained from a speaker by a
closed loop circuit configuration that converts the vibration of a cone (speaker) according to a
drive signal from a power amplifier into an electrical signal and returns it. is there. Means for
Solving the Problems In order to solve the problems, the present invention extracts only data
signals from a formatted digital signal input from an input terminal by a format conversion
circuit, and the data signal and the digital signal The above digital signals are compared /
corrected by a digital comparison circuit that inputs mechanical signals of cones (speakers) from
a speaker into an electrical signal, and different digital signals are converted into analog signals.
Then, the above-mentioned analog signal is input to the drive circuit and converted into a signal
for driving the speaker. By inputting the drive signal to the speaker, the cone (speaker) is
vibrated and converted into sound. On the other hand, in the vibration of the cone, movement of
air in the speaker resulting from mechanical vibration is detected by the detection unit,
converted into an electric signal, and returned to the digital comparison circuit. Operation With
this configuration, the vibration of the cone (speaker) according to the drive signal from the
power amplifier is converted into an electrical signal, and high quality sound can be obtained
08-05-2019
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from the speaker by the closed loop circuit configuration that returns. Embodiment 1 FIG. 1 is a
block diagram showing a digital speaker apparatus according to one embodiment of the present
invention, and FIG. 2 is a block diagram showing a detection unit. In FIG. 1, 1 is a formatted
digital audio signal input terminal, 2 is a format conversion circuit for extracting only an audio
data signal, and 3 is a comparison between a signal from the format conversion circuit and a
signal from a digital speaker A digital comparison circuit to process, 4 a drive circuit to convert
digital signals from the format conversion circuit into analog signals to drive digital speakers, 5 a
power amplifier comprising an input terminal, a format conversion circuit, a digital comparison
circuit and a drive circuit , 6 is a digital speaker that converts the signal from the drive circuit
into sound and converts the vibration of the cone (speaker) into an electrical signal; 7.8 is a cone
(speaker); 9 is a vibration of the cone (speaker) into an electrical signal Detector that converts
and outputs to digital comparison circuit, 10 is a cone (speaker) machine Than the vibration, and
the air and the outside air in the speaker is a vent to move.
Further, in FIG. 2, 11 is a first shielding plate for blocking / passing the light emitted from the
light emitting element, 12.1'3.14 is a second shielding plate having the same function as above,
Third shielding plate, n-th shielding plate, 15.17 ░ 19.21 light receiving elements for converting
light into electrical signals, 16.18, 20.22 light emitting elements for converting electrical signals
into optical signals, Reference numeral 23 denotes a shield which moves in accordance with the
movement of air. By inputting a formatted digital audio signal manually input from the input
terminal 1 of the power amplifier 5 to the format conversion circuit 2, a first digital audio signal
of only data is extracted, and the first digital signal is The second digital signal obtained by
converting the vibration of the cone 7 ░ 8 from the speaker into an electrical signal by air
movement is input to the digital comparison circuit 3, the above two digital signals are
compared, and different digital signals are supported Convert to analog signal. Then, the analog
signal is input to the drive circuit 4, converted into an analog signal for driving the digital
speaker 6, and input to the digital speaker 6, thereby converting it into sound. On the other hand,
the digital speaker 6 picks up the cones (speakers) 7 and 8 corresponding to the drive signal, and
movement of air in the digital speaker 6 occurs due to the shooting movement of the cone 7.8.
Due to the vibration of the air, the shielding portion 23 of the detecting portion 9 vibrates, and
the shielding plate 11 ░ 12.13 and the n-th shielding plate 14 which judges whether the
shielding portion 23 moves to the right or to the left Similarly, the light signal from the light
emitting elements 16.18 and 20.22 is blocked and passed through, and the light signal is
converted to an electric signal by the light receiving elements 15.17 and 19 ░ 21 to the digital
comparison circuit 3 It is something which is made to return. As described above, according to
the present invention, a digital comparison circuit and drive circuit that convert the movement of
a cone (speaker) into an electric signal and feed it back to the digital comparison circuit. The
closed loop configuration of the digital speaker absorbs the influence of non-linearity and noise
due to the transmission path, and high quality sound can be obtained from the speaker.
08-05-2019
2
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing a digital speaker device according to an embodiment of the
present invention, FIG. 2 is a block diagram showing a detection unit, and FIG. 3 is a block
diagram showing a conventional speaker device.
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circuit. Amplifier 6, old digital speaker 7, 8 cone (speaker) 9, detection unit 10 vent 10, 11 иии
First shielding plate 12,
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ииииииииииии From n from 1 from 1 to 2 15.degree. 17.19.21 .. .. light receiving element, 16, 18.
20.degree. 22 .. .. light emitting element, 23.
08-05-2019
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