JPH0244898A - headphone - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to inner-ear headphones with surround sound effects.

Conventional technology Conventionally, this kind of inner-ear type headphone is naturally a binaural type, and the unit for each device is basically a third ear type.
It had a structure as shown in the figure. That is, (1) is the first speaker unit installed at the front of the main body, (2)
is the front protector of the speaker unit, (3) is the second speaker unit installed at the rear of the main unit, (4) is the front part (4a) surrounding the first speaker unit (1), and the second speaker unit ( 3) a housing main body consisting of an eccentric rear part (4b) that substantially surrounds the area other than the rear end surface; The sound path from the two-speaker unit (3), (6) is the front part of the housing (
A comb ring (4a) is attached to the outer periphery of the housing, and a decorative ring (7) protrudes from the side surface of the rear housing (4b). This decorative ring (7) is integrally formed with a housing back plate (8) that is engaged with and held at the rear end of the housing rear part (4b). The decorative ring (7) also serves as an input line inlet, and therefore, an input coat (9) guided into the housing body (4) is inserted into this through hole.

A rubber bush (7a) is fitted to the tip of the decorative ring (7) to protect the input cord (9).

Figure 4 is a wiring diagram within the above unit phone shown in Figure 3, in which the first speaker unit (1) and the second speaker unit (3) are connected in series for the left (L) or right (R) channel. This shows that they are connected in an antiphase relationship to each other.

Problems to be Solved by the Invention However, with binaural headphones of the conventional structure as described in item 1, it is impossible to reproduce realistic sound as heard in a hall due to the following reasons. .

In other words, ■ Regarding sound propagation, both the first speaker unit (1) and the second speaker unit (3) transmit sound directly from the front of the earphone to the user's ears without any time delay. , and ■ Separated R channel sound and L channel sound signals are supplied to the container earphones independently, so you can only hear the separated signal sound from the same side, and if you do not use headphones, This is due to the fact that other channel sounds (separated speaker sounds, etc.) that naturally reach the container as crosstalk components are not audible. Therefore, the present invention constitutes an inner-ear type headphone having the following two functions. This is intended to produce a surround sound effect.

(a) The time it takes for the sound from the second speaker unit to reach the user's ears is delayed, and the time-delayed sound from the second speaker unit is due to the difference between the L channel signal and the R channel signal. shall occur.

(b) Each earphone uses a built-in first speaker unit to generate a direct signal sound in that channel, and also reproduces sound from other channels as a crosstalk component at a constant ratio.

Means for Solving the Problems For this reason, the present invention provides a first speaker unit having a front portion having an outer diameter size that is large enough to be inserted into each auricle, and having a diaphragm arranged corresponding to the front portion. and a pair of earphone housings forming a sound path adjacent to the first speaker unit and opening at the front face thereof, and a second speaker unit, and a pair of earphone housings that are adjacent to the first speaker unit and form a sound path that is open to the front surface thereof, and a second speaker unit, and a sound path from the second speaker unit. an exterior housing comprising a pair of sound holes formed on both side walls facing the front and rear sides of the second speaker unit, each end of which is connected to the pair of sound holes in the exterior housing, respectively. , a pair of tubes for transmitting sound from the second speaker unit, each other end of which is connected to a rear end of each sound path of the pair of earphone housings, and the tube is installed in the pair of earphone housings. The pair of input terminals of the second speaker unit in the exterior housing are connected to the pair of input terminals of the second speaker unit in the exterior housing, respectively. The headphone is characterized in that it is connected to each hot-side input terminal of a spin-on unit.

According to the above configuration, the sound from one second speaker in the exterior housing is transmitted to each unit via the tube, so there is a time delay. Since the input terminal of is connected between the hot side input terminals of the first speaker unit on the L side and the R side, the drive signal for this second speaker is L
This becomes a difference signal between the channel and the R channel, and the generated sound is transmitted to each unit phone in opposite phases to each other due to the positional relationship between each sound hole and the second speaker. Furthermore, each first speaker unit receives not only each channel signal, but also the number of channels (K = (1+-) times The sound is received as a crosstalk component, and a natural-sounding sound simulating sound is generated.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the first speaker unit (1) provided for each channel on the R side and the L side and the protector (2) for its diaphragm (1a) are installed in each dedicated earphone housing (10). The second speaker unit (3) is equipped with an outer housing (12) connected to these earphone housings (10) by a tube (11).
equipped inside. This second speaker unit (3)
has a larger diameter than the first speaker unit (1),
Therefore, it is used as a speaker unit capable of reproducing deep bass sounds. The earphone housing (10) has an outer diameter dimension that allows the front part with the protector (2) attached to be inserted into the auricle, and the housing main body mainly includes the outer peripheral surrounding part of the first speaker unit l-(1). (4) and a rear housing (8a) connected to the rear part of the housing body (4), and a second speaker unit (1) provided adjacent to the first speaker unit (1) in the housing body (4).
The speaker sound path (5) communicates with the housing trailing part (8a), and the distal end of the housing trailing part (8a) that protrudes downward is connected to the tube (11).

A rubber bush (6) is attached to the outer periphery of the housing body (4) as in the conventional case. Exterior housing (
12) are L side parts (12) that fit together to form a circular container shape;
e) and the R side (12r), and the L side (12r)
2t! ) The diaphragm (3a) of the second speaker unit (3) is fitted and held on the inner wall surface near the fitting part.

As a result, a pair of sound holes (13f2) and (13r) are formed on the wall surface of each side facing the back and front of the diaphragm (3a) in the second speaker unit (3), and these sound holes The starting ends of each tube (11) in the L channel and the R channel are connected to. The L side (12e) and R side (1) of the housing structure (12)
2r) is formed with a decorative ring (14) similar to conventional earphones, and an input cord (15) is inserted into this ring via a rubber bushing (16). Input signal lines to the speaker unit (3) and the first speaker unit (1) are introduced. Therefore, from the outer housing (12) to the earphone housing (1
0), the signal line for the first speaker unit is further extended along the inner wall or outer wall of the tube (11), although not shown.

FIG. 2 is a circuit diagram showing the connection relationship between each first speaker unit (1) in the L channel and R channel shown in FIG. 1 and a second speaker unit (3) common to both channels. Unit (1) or (3)
"r" and "r2°" appended to the schematic diagram represent the impedance of those speakers. As is clear from the circuit diagram, the first speaker unit of each channel is connected between the corresponding R signal source or R signal source and ground potential, and the second speaker unit (3) is connected between these first
It is connected between the hot side (non-grounded side) input terminals of the speaker unit (1), that is, between the L signal source and the R signal source. Therefore, the first speaker unit of each channel (
1) outputs, for example, the sound caused by the L signal itself supplied from the L side and the sound caused by crosstalk supplied from the R terminal through the r2rI series branch. Furthermore, L
and a second speaker unit (3) transmitted from the earphone housing (10) on the R side through a tube (11).
The sound from is also emitted. In this case, since the second speaker unit (3) is connected between the L and R signal sources, the time delay components R(t) and L(t) for each channel signal
difference, R(t)-L(t) or L(t)-R,(t)(
This polarity is based on the connection polarity of the second speaker unit (3) and the arrangement relationship with respect to the sound hole.

Therefore, when the earphone of the example is worn on both ears, L+[l, (t)-1'1(t)] +KFl =L in the left ear.
The sound of +L(t)+KIl-1t(t) is transmitted to the right ear, and since the second speaker unit component is an antiphase signal supplied from the sound hole located on the opposite side to the left channel, R+[ R(t)-L(t)]+KL=R+R(t)
To +, ((t) audio signals are transmitted. In this case,
For example, in the left ear, R(t) and L(t) are
How the speaker unit component L + K interferes with R varies depending on the relationship between the wavelengths of R, (t) and L(t) and the transmission time constant from the sound source (second speaker unit) to the sound path exit. However, it cannot be uniformly defined as an addition element or a subtraction element based only on the sign in the formula. However, in a stereo recording or audio collection environment, there is always a volume difference between the R channel and R channel signals that varies depending on the source or wavelength.
The time delay component based on the second speaker unit can fully exhibit a pair of stereo and reverberant sound effects.

Effects of the Invention As described above, the present invention transmits a time-delayed channel difference signal from a common second speaker unit through a tube, and transmits the direct sound of the L or R channel and the first sound by the first speaker unit of each earphone. Since a crosstalk component is generated via the impedance of the two speaker units, it is possible to produce a natural surround sound effect. In particular, by making the second speaker unit larger than the first speaker unit and using it for deep bass reproduction, it is possible to further enhance the surround sound effect.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of an embodiment of a headphone according to the present invention, Fig. 2 is a circuit diagram showing the speaker connection relationship of the above embodiment, and Fig. 3 is a conventional basic two-drive earphone. 4 is a sectional view showing the structure. FIG. 4 is a circuit diagram showing the speaker connection state of the earphone shown in FIG. 3.

Claims (1)

[Scope of Claims] A first device having a front surface whose outer diameter is large enough to be inserted into each auricle, and a diaphragm disposed corresponding to the front surface.
A pair of earphone housings are equipped with a speaker unit and are adjacent to the first speaker unit and form a sound path that opens on the front side thereof; an exterior housing formed by forming a pair of sound holes on both side walls facing the front and rear sides of the second speaker unit, respectively, for outputting sound; and a pair of tubes for transmitting sound from the second speaker unit, each other end of which is connected to the rear end of each sound path of the pair of earphone housings, the tubes being connected to the pair of earphone housings. Each pair of input terminals of each first speaker unit equipped with a corresponding L or R
1. A headphone, wherein an audio signal of a channel is input, and a pair of input terminals of a second speaker unit in the exterior housing are respectively connected to respective hot-side input terminals of the pair of first speaker units.