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JPS57125096

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DESCRIPTION JPS57125096
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional
microphone built-in tape recorder, FIG. 2 is a schematic view of a tape recorder provided with a
microphone device according to an embodiment of the present invention, and FIG. It is a figure
which shows the directivity pattern of a microphone apparatus. 1 · · · · · · Tape recorder body, 3.4
· · · · Bi-directional microphone unit, 5 '-· · · microphone holder.
DETAILED DESCRIPTION OF THE INVENTION The present invention provides a microphone
device capable of picking up only one sound at a distant place without picking up noise existing
between two microphone units, The device of the present invention improves the recording S / N
of a device such as a cassette tape recorder incorporating a microphone or the like having a
noise source near the microphone. The conventional cassette tape recorder built-in microphones
2), 2) were mounted as shown in FIG. In FIG. 1, 1136 .beta .//. 2, 1 is a tape recorder main body,
2 is a microphone provided in the main body 1, and the microphone 2 is generally nondirectional. The tape recorder main body 1 has a motor and a tape rotation mechanism mounted
inside, and they produce noise, and this noise enters the microphone 2 and therefore the
mechanical noise (noise) is discarded. In particular, since these mechanical sounds are in the
immediate vicinity of the microphone, their noise levels are high, and the S / N ratio to the target
sound in the distance is bad. The present invention eliminates the above-mentioned conventional
drawbacks and provides a microphone apparatus having a good S / N ratio. One embodiment of
the present invention is shown in FIG. In FIG. 2, 1 is a tape recorder main body, 5 is a
microphone holder provided in the main body 1, and bi-directional microphone units 3 and 4 are
supported by the microphone holder 6. As described above, the bidirectional microphone units 3
and 4 are disposed on the same axis, and are disposed on both sides of the tape recorder 1 with
the center at the center. Two directional fingers, the directional pattern 113 'of the directional
microphone unit 3.4 are arranged as shown in FIG. 3, and the outputs thereof are added by the
adder 6. Now, the sound P1 generated between the two units 3.4 is outputted from the
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microphone unit 3 and the microphone unit 4 (output at -2 and the output sum is canceled). On
the other hand, for the sound coming from the outside of the two microphone units 3 and 4 such
as Pa + and Po2, Pol is output by the microphone unit 3 (→ 0 at the microphone unit 4 and the
sum (system output) of both is doubled . Further, since PO2 is also output in the same phase as
the microphone unit (← in human microphone unit 3), the output is doubled. Also, the sound
from the lateral direction Ps is not sensed because it is in the 9σ direction of the bi-directional
unit. As described above, the present invention is a microphone device which has high sensitivity
on the same axis in which microphone units are arranged, and does not pick up sound in a
narrow space between microphone units or sound in the lateral direction.
When this microphone device of the present invention is used in a tape recorder as shown in FIG.
2, the mechanical noise generated from the tape recorder narrowed between the microphone
units does not collect 1384, and the axial direction of the microbob / unit is directed. Because the
directivity of is sharp, only the sound in the direction of the direction can be collected? It has the
advantage that a microphone device with a good S / N ratio can be obtained.
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