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JPH01175495

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DESCRIPTION JPH01175495
[0001]
TECHNICAL FIELD The present invention relates to a speaker device in video and audio
equipment. 2. Prior Art As shown in FIG. 2, a conventional speaker device generally comprises
only an analog circuit. An analog signal is input to the input terminal 1, and the speaker 3 is
driven through the power amplifier circuit 2. Problems to be Solved by the Invention In such a
conventional configuration, since the audio signals from the audio equipment and the system are
analog signals, they are susceptible to the noise and nonlinearity of the transmission path, and
high-quality audio is produced. The characteristics of the signal deteriorate. The present
invention provides a speaker device that corrects an audio signal based on a feedback signal
before converting the digital audio signal into an analog signal and inputting it to a power
amplifier circuit, and can transmit a high quality audio signal to a speaker. With the goal. Means
for Solving the Problems The digital speaker device of the present invention supplies an analog
signal output from the digital comparison circuit to the speaker through the power amplifier
circuit, and the movement of the diaphragm of the speaker is photoelectrically Detecting and
feeding back a digital value of vibration of the diaphragm to the digital comparison circuit, and
comparing the digital comparison circuit with a digital audio signal inputted from the outside
with a digital output signal of the N 勺 conversion circuit The digital audio signal is corrected,
and the corrected digital signal is converted to analog and supplied to the power amplifier circuit.
According to this configuration, the vibration of the diaphragm of the speaker is quickly detected
by photoelectric conversion, the digital sound is fed back to the input side of the power amplifier
circuit, and the generation is instructed by the input digital audio signal. The digital comparison
circuit compares the content of the sound being sounded with the sound wave that the speaker is
about to generate to detect the generation of a noise signal, and if the sound wave from the
speaker contains noise, The signal supplied to human power is corrected to make the noise
component smaller. Embodiment An embodiment of the present invention will be described
08-05-2019
1
below with reference to FIG. The same reference numerals are given to components having the
same function as in FIG. 2 showing the conventional example. FIG. 1 shows a digital speaker
device of the present invention. A digital audio signal 6 is supplied to the input side of the power
amplifier circuit 20 via the format conversion circuit 4 and the digital comparison circuit 5.
Reference numeral 7 denotes a vibration displacement / light conversion unit for converting the
vibration A of the diaphragm of the speaker 3 into a light signal B, and 8 denotes a light signal B
received from the vibration displacement / light conversion unit 7 and digitally converting the
signal. This is an optical / electrical conversion unit that feeds back to the comparison circuit 5.
The format conversion circuit 4 starts one frame of the digital audio signal input from the input
terminal 9. Digital signals of k channels are extracted and supplied to the digital comparison
circuit 5. The digital comparison circuit 5 compares the digital signal from the format conversion
circuit 4 with the digital signal from the optical / electrical conversion unit 8 and corrects the
digital signal from the format conversion circuit 4 if there is an error. This is analog converted
and supplied to the power amplifier circuit 2. If it is correct, the digital signal from the format
conversion circuit 4 is supplied as it is to the power amplifier circuit 2 as an analog conversion
unit. The correction of the digital signal in the digital comparison circuit 5 is performed so that
the noise component generated from the speaker 3 is reduced. Specifically, the vibration
displacement / light conversion unit 7 is configured by an optical element on the diaphragm of
the speaker 3. Because of this configuration, even if noise is mixed in the transmission path from
the input side of the power amplifier circuit 2 to the speaker 3, the state of this noise mixing is
the vibration displacement / light conversion unit 7 and the light / electricity conversion unit 8.
The digital comparison circuit 5 detects a mismatch between the digital signal from the format
conversion circuit 4 and the feedback signal. In this case, the signal supplied to the power
amplifier circuit 2 is corrected in the digital comparison circuit 5. The situation where noise is
generated from the speaker 3 is greatly reduced. As described above, according to the present
invention, the vibration of the diaphragm of the speaker is photoelectrically converted and fed
back, and a digital comparison circuit, a power amplifier circuit, a speaker, and a closed loop of
light / electric conversion means are configured to Since the signal to the amplifier circuit is
corrected, the influence of noise and non-linearity of the transmission path can be absorbed, and
a higher quality sound can be obtained from the speaker than before.
[0002]
Brief description of the drawings
[0003]
08-05-2019
2
FIG. 1 is a block diagram of an embodiment of a digital speaker device according to the present
invention, and FIG. 2 is a block diagram of a conventional speaker device.
Reference Signs List 2 power amplifier circuit 3 speaker 4 format conversion circuit 5 digital
comparison circuit 6 digital audio signal 7 vibration displacement / light conversion unit 8 ...
light / electrical conversion unit.
08-05-2019
3
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