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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
voice input device used for voice input of a car telephone or the like. Prior Art FIG. 3 shows an
example of practical use of a voice input device of a car telephone installed in a car. A voice input
device 8 is incorporated in the headrest 9 of the seat 11 of the car. FIG. 4 shows the
configuration of the voice input device 8. A sensor 5 senses vibration of voice and converts it into
an electric signal, and supplies the electric signal to the car telephone 7 through an amplifier 6.
To explain the operation of the above example, as shown in FIG. 5, when a person emits a voice
in a state in which the top 1Q is in contact with the voice input device 8 incorporated in the
headrest 9, the voice signal is vibrated in the head. It is propagated and transmitted to the voice
human-powered device 8 in contact with the head as a vibration component of the skull. The
voice signal thus propagated is converted into an electric signal by the sensor 5 of FIG. 2, and is
outputted to the car telephone 7 and transmitted to the other party in the call. In FIG. 6, 13
propagates in the air as an air vibration component. However, in the configuration of the
conventional voice input device, as indicated by the clan in FIG. 6, the frequency f detected by the
sensor 5 for sensing voice is high, and the number component is low. As compared to the
frequency component, there was a slight drop in the output level. That is, the frequency
characteristics at the voice input portion of the car telephone apparatus A shown at point B in
FIG. 4 significantly deteriorate the intelligibility of the voice signal due to the reduction of the
output level of high frequency components as seen in FIG. It becomes difficult to hear as a voice.
The present invention solves such conventional problems, and provides an audio input device
capable of improving the intelligibility of an audio signal output from a sensor that detects
vibration of audio from the head. The purpose is to Means for Solving the Problems In order to
achieve the above object, the present invention is provided with a frequency correction filter 3
for enhancing the output of high frequency components in the voice input unit of a car telephone
apparatus. Operation The present invention operates as follows by the above configuration. That
is, the signal collected by the sensor for detecting the vibration of the voice is passed through the
frequency correction filter to prevent the reduction of the output level in the high frequency
component of the voice signal and improve the clarity of the voice signal. is there. Embodiment 1
FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, a sensor 1
for detecting vibration of voice such as a microphone is connected to an amplifier 2 .
It is a filter for correcting the frequency of the 3fd amplified signal, and 4 is a car telephone
apparatus. The installation position and method of use in a car are the same as in FIGS. 3 and 5.
As shown by the broken line d in FIG. 3, the filter 3 has a linear increase in output level toward
the high frequency component at the low output level in the low frequency component. It has a
frequency characteristic opposite to that of FIG. Next, the operation of the above embodiment
will be described. The sensor 1 which senses vibration of voice senses voice and converts it into
an electrical voice signal. Then, the signal amplified by the amplifier 2 is passed through the filter
3 to perform frequency correction. Frequency correction corrects the characteristics opposite to
those of the sensor 1 as shown in FIG. 3a, and the output level at the output point A of the filter 3
is substantially flat from low frequency to high frequency as shown in FIG. 3b. Correct to become
A voice signal whose output has been corrected in this manner is output to the car telephone
wave @ 4. As described above, by correcting the voice signal so that the output characteristics
become substantially flat in all frequency bands, the clarity of the voice signal is improved, and
the quality of the call to the other party in the call via the car telephone device 4 It has the effect
of becoming better. Note that the frequency characteristics after correction of the output level do
not necessarily have to be completely flat characteristics, and there is no problem even if they
slightly fluctuate. As is clear from the above embodiments, the present invention improves the
clarity of the audio signal by correcting the frequency characteristic of the output level of the
audio signal output from the sensor that senses the vibration of the human skull due to speech. It
can be done.
Brief description of the drawings
1 is a schematic block diagram of a voice input device according to an embodiment of the
present invention, FIG. 2 is a frequency characteristic diagram for explaining the operation of a
filter used in the present invention, and FIG. 4 is a schematic view of an example of a
conventional voice input device, FIG. 5 is a side view of the conventional voice input device, and
FIG. 6 is a side view of the voice input device. 6, 1.5 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · filter · 4, 7 · · · ..... automobile telephone apparatus, 8 ..... voice manpower apparatus, 9 .....
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