JPH071956B2 - Microphone combined headphone - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes one unit having a reversible electroacoustic conversion characteristic, and intends to share the unit as a microphone or a headphone. The present invention relates to a microphone / headphone suitable for recording and reproducing the call sound.

2. Description of the Related Art Conventionally, a telephone pickup, which is intended to record the contents of a telephone call, has an electromagnetic coil attached to a part of the casing of the telephone, and the leakage flux mainly from a hybrid transformer (coil) inside the telephone. I received this and converted it into electric current. In recent years, with the change in the structure of the telephone, a telephone with less magnetic flux leakage has appeared, and in the case of a telephone having a mid-exchange function such as a button telephone, the electromagnetic coil is added to the electromagnetic coil for the operation of the microcomputer for controlling the telephone. On the other hand, some appear to introduce noise, and recording by such a method is gradually becoming impractical.

As an example of connecting a microphone to a headphone, there is a microphone attached to the opposite surface of the headphone (earphone) as shown in Japanese Patent Publication No. 53-42401.
This method requires a microphone dedicated to recording in addition to headphones (earphones), and it is difficult to downsize because of the two-piece structure. In order to apply this device to record the contents of a telephone call, the pronunciation can be recorded by placing a microphone in front of the handset of the telephone.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-mentioned conventional method, not only the number of telephones capable of making a good recording by using the conventional telephone pickup has been gradually limited, but the noise is larger than the signal. There are some cases where it is not practical due to the fact that there is. In addition, even if the sound of the handset is recorded by a microphone, the headphones (earphones) for monitoring and the microphone for recording use different elements, and the structure is complicated and the dimensions are large. there were.

Means for Solving the Problems In order to solve the above problems, a microphone / headphone of the present invention is a unit case in which a unit having reversible electroacoustic conversion characteristics is formed in a size structure capable of being embedded and retained in the ear shell. The front surface of the unit case has sound holes for sound collection and sound generation, and the other surface has openings for adjusting the characteristics. On the other hand, the front sound hole of the unit case is held outward when used as a microphone. In the rear of the unit case as described above, an ear shell or an ear canal insert holder is provided via a connecting member,
The insertion holder is provided with a through hole for introducing an external sound when inserted into the ear, and a distance between the opening for adjusting the characteristics of the unit case and the through hole of the insertion holder is set to the connecting member. It is characterized by being configured so as to be large.

Operation The present invention can be used for both recording and reproduction by using one electroacoustic conversion element having the above-described structure and changing the direction according to the purpose of use. In addition, since the connection member increases the distance between the characteristic adjustment opening of the unit case and the through hole of the insertion holder,
When used as a microphone, it is possible to shield or attenuate the transmission of muffled sound peculiar to bone conduction that is caused by the voice being transmitted to the ear canal by bone conduction and being transmitted from the through hole to the unit through the opening of the unit case. it can. Therefore, at the time of recording, the sound from the handset is recorded as faithfully as possible without causing unnatural sound to be recorded due to an unnatural conduction form such as bone conduction, and at the same time, the sound from the handset is efficiently recorded. It can fulfill the action of transmitting to the human ear.

Examples Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is a partial side sectional view of a microphone / headphone showing a first embodiment of the present invention (A in FIG. 2).
-A 'cross section), FIG. 2 is a front view, FIG. 3 is a side view, and FIG.
The figure is a rear view, FIG. 5 is a rear view with ear pads removed, and FIG. 6 is a sectional view taken along line BB '. In the figure, 1 is a dynamic type head-on unit, 2 is its unit case, 3 is a case front plate having a large number of front sound holes 3'on its front surface, 4 is a breathable foam material or the like for improving the ear contact. The case front plate is covered with ear pads made of. Reference numeral 5 is an input / output code of the headphone unit 1. Since the signal level is low when the headphone unit 1 is used as a microphone, it is necessary to use a shielded wire. Reference numeral 6 is a bushing for protecting the cord, and 7 is an opening for adjusting the characteristics provided in the unit case 2, which is provided for adjusting the characteristics of each of the headphones and the microphone to be optimum for the application. Reference numeral 8 denotes an ear shell insertion holder when the headphone unit 1 is used as a microphone, and the rear surface of the case 2 and the ear shell insertion 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 FIG. 5 and FIG. A partition plate 9 is interposed between the case 2 and the rear opening 7 so that the distance between the rear opening and the through hole is large. Reference numeral 11 is an input / output plug provided at the tip of the cord 5. FIG. 7 is an input / output block diagram of the tape recorder, in which 12 is a tape recorder, 13 is a headphone jack, and 14 is a microphone jack.

The operation of the microphone / headphone configured as described above will be described below with reference to FIGS. 1 to 7.

When this embodiment is used as headphones, the portion covered by the ear pad 4 is inserted and held in the ear shell, and the input / output plug is used.
Connect 11 to the headphone jack 13 of the tape recorder 12. On the other hand, when used as a microphone, it suffices to insert the ear shell insert holder 8 having the ear pad 10 into the ear shell and connect the input / output plug 11 to the microphone jack 14. When recording the contents of a telephone call, put a receiver (not shown) on your ear in this state. Since the unit case 2 has a small outer shape, the voice of the receiver leaks from the periphery of the 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 headphone unit 1 from the front sound hole 3'of the case front plate 3, and the generated signal current is input / output cord 5 and input / output plug 11 to the microphone jack 14
In addition, the tape recorder can be recorded by keeping it in a recording state. On the other hand, the telephone conversation sound received by the transmitter of the telephone is also uttered through the receiver, so that both conversation sounds can be recorded. At this time, one's own voice is divided into two, and one of them may reach the unit 1 inside the unit case 2 as a spatial sound in addition to the transmitter of the telephone. Since it was closer to the unit 1 and the front plate 3 was pressed by the handset, there was almost no influence of spatial sound.
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,
As a result of the addition of the sound lacking the high range characteristic of bone conduction to the voice output from the handset, the recorded voice was a murky, unclear sound, but with the partition 9 attached, The sound conduction was considerably reduced, and it was possible to record with a sound as clear as the other party's voice. It is considered that, without the partition plate, the air vibration generated in the auricle by bone conduction is transmitted to the unit 1 through the through hole 8'and the characteristic adjusting opening 7 and converted into a signal current. The partition plate greatly attenuates the air vibrations by this path by blocking the air vibrations by this path or increasing the distance. To further enhance this effect, the ear shell insertion holder 8 or The partition plate 9 connecting the unit cases 2, and further, any or all of the unit cases 2 are made of soft rubber or plastic having a large damping resistance against vibration, so that not only air vibration but also solid It is also possible to make every effort to prevent the transmission of internal vibrations. This can be easily verified from the fact that when you speak a word with your finger stuck in your ear, you feel vibrations at your fingertips.

FIG. 8 is a side view of a microphone / headphone showing a 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. Reference numeral 15 is an ear canal insert holder, 16 is a through hole for introducing an external sound into the ear canal, 16 'is an outer opening thereof, and 16 "is an opening into the ear canal.

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

Usage as headphones is the same as in the first embodiment.
When the device is used as a microphone, the device 15 for holding the insertion device 15 in the ear canal is inserted into the ear canal to hold the device. 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 unit case 2, or the distance between them becomes long. Therefore, the influence on the unit 1 can be greatly reduced as in the first embodiment. Further, if necessary, the 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 vibration, so that 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 case front plate 3, the ear shell insertion holder 8 and the like are covered with ear pads, but this is not essential. However, the ear pad on the front plate of the case has an effect of softening noise when it hits the handset of the telephone, and the ear pad of the insertion holder in the auricle may attenuate the conduction of vibration in the auricle. Although the example of the partition plate is four or two, the number of partition plates may be one, three, etc. 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 you can not provide a partition plate,
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 unit case and the lower end of the insert holder in the auricle, the distance becomes equivalent to providing a partition plate, and the approximate effect Can be obtained.

It should be noted that although all the microphone / headphones have been described with one ear in the embodiments, one ear is sufficient for a telephone, but it is needless to say that binaural recording / playback can be performed for both ears in general recording. Further, in the embodiment, the description has been made with the headphones, but the present invention can be applied to earphones having different units or different structures. Further, the unit may be a piezoelectric or capacitor type other than the electromagnetic conversion type.

EFFECTS OF THE INVENTION As described above, the present invention is a microphone that utilizes reversible electroacoustic conversion characteristics, and can be used for recording and playback by reversing the method of attaching the element to the ear. A dual-purpose headphone can be realized, and when used as a microphone, external sound is introduced into the ear canal, and among the sounds produced by the wearer of the ear, the sound is generated in the ear canal and the auricle due to bone conduction. It prevents air vibrations, and if necessary, vibrations from being transmitted to the unit that is the power generating element, and also improves the frequency characteristics of microphones and headphones, especially regarding the recording of telephone call contents. Is extremely effective in that it can be put to practical use even when the conventional method cannot.

[Brief description of drawings]

FIG. 1 is a partial side sectional view of a microphone / headphone according to a first embodiment of the present invention (A- in FIG. 2).
(A 'cross section), FIG. 2 is a front view, 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 BB ′. Sectional drawing, Fig. 7 is input / output block diagram of tape recorder, Fig. 8
FIG. 9 is a side view of a microphone / headphone showing a second embodiment of the present invention, and FIG. 9 is a plan view of the same. 1 headphone unit, 2 unit case, 3
...... Case front plate, 3 '... Front sound hole, 7 ... Characteristic adjustment opening, 8 ... Ear shell insertion holder, 8' ... through hole, 9
...... Partition plate, 15 …… Insert insert holder in the ear canal, 16 …… Through hole.

Claims (3)

[Claims] 1. A dimension in which a unit having a reversible electroacoustic conversion characteristic is housed inside, a front sound hole is provided on the front surface thereof, and an opening for characteristic adjustment is provided on the other surface thereof so that the unit can be embedded and retained in the auricle. A unit case having a structure, and an ear shell or an ear hole insertion holder having a through hole for collecting an external sound, which is coupled to the rear of the unit case through a connecting member, and the unit case is provided. The microphone-combined headphone, characterized in that the distance between the characteristic adjustment opening and the through hole of the ear shell or the ear canal insertion holder is increased by the connecting member. 2. The connecting member is a partition plate that shields between the opening for adjusting the characteristics of the unit case and the through hole of the auricle or the ear canal insert holder. Headphones that also serve as the microphone described in the item. 3. The unit case, the ear shell or the ear canal insertion holder, and some or all of their connecting members are made of a soft material having a large damping resistance against vibration transmission. The microphone / headphone according to claim 1.