JPH071957B2 - Microphone for telephone recording - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone recording microphone for mounting a microphone unit in an ear shell or a telephone set of a telephone and recording a call content in the vicinity of the telephone set. It is a thing.

2. Description of the Related Art Conventionally, in order to record the contents of a telephone call, an electromagnetic coil called a telephone pickup is attached to a part of the casing of the telephone, and the magnetic flux mainly from a hybrid transformer (coil) inside the telephone receives the magnetic flux. Was converted into electric current. However, in recent years, with the change in the structure of telephones, telephones with little or no such magnetic flux leakage have appeared. Also, in the case of telephones that have a mid-exchange function such as button telephones, the operation of the microcomputer for controlling such For this reason, some appear to mix noise with the electromagnetic coil, and recording by such a method is gradually becoming impractical.

Instead, condenser microphones, dynamic microphones, etc. were attached to earphones and earpieces, or directly attached to the handset, and recorded near the handset. Since the voice of the other party is emitted from the handset in addition to the voice of the other party, the content of the call can be recorded.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned conventional method, not only the number of telephones that can make a good recording using the conventional telephone pickup has been gradually limited, but also noise generated from the telephone leaks. There are some cases where it is not practical because there is something larger than the signal or no leakage magnetic flux. Even if you record the sound of the handset with a microphone, if you use an omnidirectional or unidirectional unit for the microphone, it is easy to pick up ambient noise and noise in addition to the telephone call sound, making it difficult to hear the recorded call content. Had the problem.

In view of the above problems, the present invention is capable of clearly collecting telephone conversation sounds by eliminating ambient noise and noise as much as possible, and at the time of collecting sounds of self-confidence due to an unnatural conduction form such as bone conduction. Provide a microphone for telephone recording that collects only the sound from the handset as faithfully as possible without collecting unnatural sounds, and at the same time efficiently transmits the sound from the handset to the human ear. It is a thing.

Means for Solving the Problems In order to solve the above-mentioned problems, a telephone recording microphone according to the present invention has a close-talking microphone unit housed therein, a front sound hole on the front surface, and a characteristic adjustment opening on the rear surface. It is equipped with a unit case and a shield is provided at the rear of it.
This shield is provided with a through hole for introducing the sound from the handset of the telephone into the ear hole, and the distance between this through hole and the opening for adjusting the characteristics of the microphone unit case is maximized. It is installed and configured.

Effect of the Invention The present invention has the characteristics described above of the close-talking type microphone, that is, it has low sensitivity to sound from a sound source distant from the microphone (plane wave) and high sensitivity to sound from a close sound source (spherical wave). Characteristics (For this characteristic,
For example, "Microphone Handbook" edited by Japan Broadcasting Corporation
Second edition November 30, 1973 Published by Japan Broadcast Publishing Association 21
P. 0-215 "and" Heitaro Nakajima et al., Practical Microphone Handbook, April 1, 1978, 10th edition, published by CQ Publisher
"Noise-insensitive microphone" on pages 107-108)
Therefore, the conversation sound of the telephone can be clearly picked up by eliminating ambient noise and noise as much as possible. In addition, a shield with a through-hole is provided at the rear of the microphone unit that has an opening for adjusting the characteristics on the rear surface, and the distance between the opening and the through-hole is arranged to be as large as possible. The sound of the sound is picked up as faithfully as possible from the handset without the unnatural sound being picked up by an unnatural conduction form such as bone conduction. At the same time, the sound from the handset is efficiently heard by the human ear. Will be able to carry out the action of transmitting to.

Embodiment Hereinafter, a telephone recording microphone according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the first of the present invention.
FIG. 2 is a front view showing a partial side view of the telephone recording microphone showing the embodiment of FIG.
3 is a side view, FIG. 4 is a rear view, FIG. 5 is a rear view with ear pads removed, and FIG. 6 is B- in FIG.
It is a B'cross section. In the figure, 1 is a close-talking type microphone unit, and in the figure, an example of a dynamic type is shown.
A diaphragm (not shown) is provided on the front surface thereof, and an opening (not shown) reaching the back surface of the diaphragm through a braking material is provided on the rear surface thereof, so that the close contact characteristic as described above is provided. Reference numeral 2 is the microphone unit case, 3 is a front plate of the case having a large number of front sound holes 3'provided on its front surface, and 4 is a pad made of a breathable foam material or the like to prevent a sound when hitting the receiver. It covers the case front plate. Reference numeral 5 is an output code of the microphone unit 1, 6 is a bushing for protecting the code, and 7 is an opening for adjusting characteristics provided on the rear surface of the microphone unit case 2 so that the close-talk characteristics of the microphone are optimal for the application. It is provided for adjustment. Reference numeral 8 denotes an ear-shell insertion holder that also serves as a shield that blocks sound in front of and behind it. The rear surface of the case 2 and the ear-shell holder 8 are connected by a partition plate 9. Numeral 10 is an ear pad that covers the ear shell insertion holder to improve the ears and is also made of breathable foam material as in the case of 4. Further, the ear shell insertion holder 8 is provided with a through hole 8'as shown in Figs. 1 and 5, and as will be understood by comparing Figs. 5 and 6, the through hole 8'and the microphone are understood. A partition plate 9 is interposed between the rear opening 7 of the unit case 2 and the unit case 2 so that the distance between the rear opening and the through hole is maximized. Reference numeral 11 is an output plug provided at the tip of the cord 5. FIG. 7 is an input / output block diagram of a tape recorder that should record the output of this microphone. 12 is a tape recorder,
13 is a headphone jack and 14 is a microphone jack. The operation of the telephone recording microphone configured as described above will be described below with reference to FIGS. 1 to 7.

When recording the contents of a telephone call using an embodiment of the present invention, the ear shell insert holder 8 having the ear pad 10 is inserted into the ear shell, and the ear pad is placed on the main body of the ear receiver (not shown). ). Connect the output plug 11 to the microphone jack 14. Since the microphone unit case 2 has a small outer shape, the generation of the handset leaks from the periphery of the microphone unit case 2 and is transmitted to the inside of the ear canal through the through hole 8 ′ provided in the ear shell insertion holder 8, so that the other party's voice can be heard. At the same time, sound pressure is applied to the microphone unit 1 from the front sound hole 3'of the case front plate 3, and the generated signal current is applied to the microphone jack 14 by the output cord 5 and the output plug 11, so that the tape recorder is in a recording state. Can be recorded. On the other hand, since the telephone conversation sound received by the transmitter of the telephone is also generated through the receiver, both conversation sounds can be recorded. At this time, the self-generated sound is divided into two, and one of them may reach the microphone unit 1 inside the microphone unit case 2 in addition to being picked up by the transmitter of the telephone as a spatial sound. Due to the close-talking characteristics, the amount of ambient sound and noise, as well as the amount of sound picked up by the spatial sound of its own utterance, is extremely small. On the other hand, the so-called bone conduction sound that travels through the inside of the head and reaches the inside of the auricle is recorded in a considerably large amount without the partition plate 9, and the sound lacking the high range peculiar to the bone conduction sound is uttered by the handset As a result, the recorded own voice was a muddy and unclear sound, but with the partition 9 attached, the conduction of sound by this route was considerably reduced, and the voice was as clear as the other party's voice. I was able to record with a good sound. This is because the close-talking microphone has high sensitivity to the sound emitted near the opening on the rear surface, so if there is no partition plate, the air vibration generated in the auricle due to bone conduction does not affect the through hole 8'and the characteristic adjustment. It is considered that it is transmitted to the microphone unit 1 through the opening 7 for use and converted into a signal current. The partition plate greatly reduces the air vibrations by this path by blocking the air vibrations by this path or by increasing the distance. To further enhance this effect, the ear shell insertion holder 8 or Is a partition plate 9 that connects it to the microphone unit case 2, and further, if any or all of the microphone unit case 2 is made of soft rubber, plastic or the like having a large damping resistance against vibration, only air vibration Not only that, but also the prevention of the transmission of vibration in the solid body can be ensured. With your finger in your ear,
This can be easily verified from the fact that when you say something, you feel vibrations at your fingertips.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 8 is a side view of a telephone recording microphone showing the second embodiment of the present invention, and FIG. 9 is a plan view of the same. Components having the same functions as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. 15 is an ear canal insertion holder that also serves as a shield, 16 is a through hole for introducing external sound into the ear canal, 16 'is an external opening, 16 "is an ear canal. It is an opening.

Regarding the second embodiment configured as described above, the eighth embodiment will be described below.
This will be described with reference to FIGS.

When the microphone is used, the ear canal insertion holder 15 is inserted into the ear canal to hold the device of the present invention. External sound and sound of the handset enter through the opening 16 'outside the through hole 16 and are transmitted through the through hole 16 into the ear canal through the opening 16 "into the ear canal.

On the other hand, the air vibration in the ear canal due to its own voice also goes out in the opposite route, but the partition plate 9 blocks the space up to the opening 7 of the microphone unit case 2, or the distance between them becomes long. Therefore, the influence on the microphone unit 1 can be greatly reduced as in the first embodiment.
Furthermore, if the microphone unit case 2, the partition plate 9, and the ear canal insertion holder 15 are made of a soft material having a large damping resistance against vibrations as needed, the effect is further enhanced as in the first embodiment. is there.

In the above embodiments, various modifications can be made within the scope of the invention. That is, in the embodiment, the front plate 3 of the case, the in-ear shell insertion holder 8 and the like are covered with pads, but this is not essential. However, the pad on the front plate of the case has the effect of softening the noise when it hits the handset of the telephone, and the ear pad of the insert holder in the auricle may attenuate the conduction of vibration in the auricle. There are 4 or 2 partition plates.
Although an example of one sheet is shown, one or three sheets may be used depending on the structure and the positions of the openings and the through holes, and the mold may be a curved surface instead of a flat plate.

Therefore, it is necessary to consider the structure of the partition plate and the positions of the opening and the opening so that the distance from the opening to the opening is as large as possible and acoustic transmission is minimized. Even if a partition plate cannot be provided, the partition plate can be distanced by devising the structure and separating the positions of the opening and the through hole as much as possible, for example, the upper end of the microphone unit case and the lower end of the ear shell insertion holder. This is equivalent to the provision of, and an approximate effect can be obtained.

Although the drawing mainly shows an example of a dynamic microphone unit, this may be a microphone unit having an electret condenser microphone or other power generation mechanism as long as it has a close talk characteristic.

Further, in the figure, it is shown that it is attached to the ear shell or inside the ear, but it may be attached to the receiver by metal fittings, adhesion, a rubber cover or other methods. In this case, for example, the ear shell insertion holder 8 in FIG. 1 functions only as a shield that shields the sound from the front surface and the rear surface of the unit case 2.

EFFECTS OF THE INVENTION As described above, the present invention efficiently collects the call sound emitted from the handset of a telephone when used as a telephone microphone, and avoids ambient noise, noise, and spatial sounds emitted by the speaker as much as possible. While introducing the sound of the handset of into the ear canal,
Of the sound produced by the wearer in the ear, air vibrations and vibrations that occur in the ear canal and ear shell due to bone conduction, etc. are prevented as much as possible from being transmitted to the microphone unit, which is the power generating element, and the sound is not collected as a microphone. This is a very effective invention in that the sound characteristics can be improved, and in particular, the recording of the call contents of the telephone is put into practical use even when the conventional method cannot.

[Brief description of drawings]

FIG. 1 is a partial side sectional view of the telephone recording microphone according to the first embodiment of the present invention (AA 'cross section in FIG. 2), FIG. 2 is a front view thereof, and FIG. 3 is a side view thereof.
FIG. 4 is a rear view of the same, FIG. 5 is a rear view of the same with the ear pads removed, FIG. 6 is a sectional view of BB ′, FIG. 7 is an input / output block diagram of the tape recorder, and FIG. 8 is the present invention. FIG. 9 is a side view of the telephone recording microphone showing the second embodiment of FIG. 1 ... Close-talking type microphone unit, 2 ... Microphone unit case, 3 ... Case front plate, 3 '... Front sound hole, 7 ... Aperture for characteristic adjustment, 8 ... Ear shell also serving as a shield Inner insert holder, 8 '... through hole, 9 ... partition plate, 15 ...
… In-ear insert holder that doubles as a shield, 16 …… through hole

Claims (4)

[Claims] 1. A close-talking type microphone unit is housed inside, and a microphone unit case having a front sound hole on the front surface and an opening for characteristic adjustment on the rear surface is provided, and a shield is provided at the rear of the microphone unit case. A through hole for introducing sound from the handset of the telephone into the ear canal is provided, and the through hole and the opening for adjusting the characteristics of the microphone unit case are arranged so as to be maximized. Characteristic microphone for telephone recording. 2. The telephone recording microphone according to claim 1, further comprising a partition plate provided between the characteristic adjusting opening and the through hole of the shield to shield sound. 3. The shield according to claim 1, wherein the shield also serves as an ear shell or an ear canal insertion holder for inserting and holding the microphone in the ear shell or ear canal. Microphone for telephone recording as described. 4. A unit case, a shield, an ear shell or ear canal insert holder, a partition plate, and a part or all of their connecting members are made of a soft material having a large damping resistance against vibration transmission. The microphone for telephone recording according to claim 1, 2 or 3, characterized in that