JP2009141675A - Headphone and cable for the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headphone dispensing with wiring along an arm. <P>SOLUTION: A cable 30 distributes first and second audio signals S1, S2 output from a sound source to first and second casings 10a, 10b. A first signal line L1 of the cable 30 is laid between an input plug 32 and a first terminal 34a to transmit the first audio signal S1. A second signal line L2 is laid between the input plug 32 and a second terminal 34b to transmit the second audio signal S2. A third signal line L3 is laid between the first and second terminals 34a, 34b in parallel with the first and second signal lines L1, L2 via the input plug 32. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to headphones.

Headphones with a noise canceling function have been developed in order to provide a comfortable playback environment in the noise of crowds and trains. Noise canceling collects ambient noise (environmental sound) with a microphone, inverts the phase, and superimposes it on an audio signal to be reproduced from a speaker. As a result, the environmental sound component output from the speaker and the actual environmental sound are offset, and only the audio (audio) signal component is perceived by the human ear.
JP 2004-214765 A JP-A-11-187476

  FIG. 1 is a diagram illustrating a configuration example of a headphone 200 with a noise canceling function. The headphone 200 with a noise canceling function includes a first housing 50 a and a second housing 50 b that are attached to the left and right ears, and a cable 52. The first housing 50 a and the second housing 50 b are connected by an arm 56. When the noise canceling function is provided independently for both the left and right channels, noise canceling circuits 58a and 58b for canceling noise are mounted on each of the first casing 50a and the second casing 50b.

  When the battery 60 is mounted only in one housing (for example, the first housing 50a), the arm 56 of the headphone 200 is supplied to supply the battery voltage to the noise canceling circuit 58b on the other (second housing 50b side). The wiring 62 was laid in the inside.

  In general, the arm 56 is generally configured to be extendable and retractable according to the size and shape of the user's head in order to improve the wearability of the headphones 200. Alternatively, in order to improve the portability of the headphones, it may be configured to be foldable.

  However, when wiring for supplying a power supply voltage from one housing to the other housing is laid in the arm, the wiring may affect the mobility of the arm. Alternatively, when a wiring that does not affect the mobility is used, there is a problem that the durability of the wiring is sacrificed. Such a problem may occur not only with headphones having a noise canceling function.

  The present invention has been made in view of such circumstances, and an object thereof is to provide headphones that do not require wiring along the arm.

  One embodiment of the present invention relates to a headphone that converts an audio electrical signal output from a sound source into an acoustic signal. This headphone includes a first housing, a second housing, and a cable. The first casing is a battery, a first speaker, a first microphone, and an audio signal collected by the first microphone is phase-inverted and superimposed on the input first audio signal to drive the first speaker. And a first drive circuit. The second case is a second speaker, a second microphone, and a second speaker that inverts and superimposes the audio signal collected by the second microphone on the input second audio signal and drives the second speaker. A driving circuit. The cable distributes the first and second audio signals output from the sound source to the first and second housings. The cable is laid between the input plug and the first terminal, the first terminal to be connected to the first housing, the second terminal to be connected to the second housing, the input plug and the first terminal, A first signal line for transmitting an audio signal, the input plug and the first terminal, and a first ground line paired with the first signal line, and an input plug and the second terminal. A second signal line for transmitting the second audio signal, a second ground line laid between the input plug and the second terminal and paired with the second signal line, and a first terminal and a second terminal And a third signal line laid in parallel with the first signal line and the second signal line via an input plug. The first drive circuit receives power supply from the battery via the wiring laid in the first housing, and the second drive circuit receives power supply from the battery via the third signal line.

  “Headphone” refers to a device that gives an acoustic signal to the left and right ears of a human, and the size is not limited. Therefore, the “headphone” includes an earphone, a headset for calling, and the like. According to this aspect, wiring along the arm is not necessary.

  Each of the first and second drive circuits receives a microphone amplifier that amplifies the output of the corresponding microphone, a phase adjustment circuit that adjusts the phase of the output of the microphone amplifier, and a speaker amplifier that amplifies the output of the phase adjustment circuit. And a signal adding circuit that superimposes the output of the corresponding speaker amplifier on the corresponding audio signal and outputs it to the corresponding speaker.

  Another aspect of the present invention relates to a headphone cable for connecting headphones having a first housing and a second housing to a sound source. The headphone cable is laid between a detachable input plug, a first terminal to be connected to the first housing, a second terminal to be connected to the second housing, and the input plug and the first terminal. A first signal line for transmitting the first audio signal, a first ground line laid between the input plug and the first terminal and paired with the first signal line, and between the input plug and the second terminal A second signal line for transmitting a second audio signal, a second ground line laid between the input plug and the second terminal and paired with the second signal line, a first terminal and a second And a third signal line laid via an input plug in parallel with the first signal line and the second signal line between the two terminals.

  According to this aspect, wiring along the arm is not necessary.

  The third signal line may be used to form the same potential in each of the first housing and the second housing.

  The third signal line may be used to supply a voltage of a battery mounted on one of the first and second housings to the other housing.

  Note that any combination of the above-described constituent elements and the constituent elements and expressions of the present invention replaced with each other among methods, apparatuses, systems, etc. are also effective as an aspect of the present invention.

  According to the present invention, wiring along the arm is not necessary.

  The present invention will be described below based on preferred embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. The embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  In this specification, “the state in which the member A is connected to the member B” means that the member A and the member B are physically directly connected, or the member A and the member B are in an electrically connected state. Including the case of being indirectly connected through other members that do not affect the above. Similarly, “the state in which the member C is provided between the member A and the member B” refers to the case where the member A and the member C or the member B and the member C are directly connected, as well as an electrical condition. It includes the case of being indirectly connected through another member that does not affect the connection state.

  FIG. 2 is a diagram illustrating a configuration of the headphone 100 according to the embodiment. The headphone 100 converts an audio electrical signal output from a sound source (not shown) into an acoustic signal.

The headphone 100 includes a first housing 10a, a second housing 10b, a cable 30, and an arm 10c.
A battery 12, a first speaker 14a, a first microphone 16a, and a first drive circuit 20a are mounted inside the first housing 10a.
The first microphone 16a collects environmental sound and converts it into an electric sound signal. The first drive circuit 20a is a noise canceling circuit, and outputs a sound signal collected by the first microphone 16a to a first audio signal S1 that is output from a sound source and to be output as an acoustic signal from the first speaker 14a. The first speaker 14a is driven by superimposing the phase reversed.

The first drive circuit 20a includes a microphone amplifier 22a, a phase adjustment circuit 24a, a speaker amplifier 26a, an addition resistor R1, and an addition resistor R2.
The microphone amplifier 22 amplifies the output signal of the first microphone 16a. The phase adjustment circuit 24 adjusts the phase of the output of the microphone amplifier 22. The speaker amplifier 26a amplifies the output of the phase adjustment circuit 24a. The addition resistor R1 and the addition resistor R2 function as a signal addition circuit that superimposes the output of the speaker amplifier 26a on the first audio signal S1 input via the cable 30 and outputs it to the first speaker 14a.

A second speaker 14b, a second microphone 16b, and a second drive circuit 20b are mounted inside the second housing 10b.
The second microphone 16b collects environmental sound and converts it into an electric sound signal. The second drive circuit 20b is a noise canceling circuit, and superimposes the audio signal collected by the second microphone 16b on the second audio signal S2 output from the sound source by inverting the phase, and the second speaker 14b. Drive. The second drive circuit 20b is configured similarly to the first drive circuit 20a.

  The first housing 10a and the second housing 10b are mechanically connected by an arm 10c.

The cable 30 distributes the first and second audio signals S1 and S2 input from the sound source (not shown) to the input plug 32 to the first casing 10a and the second casing 10b.
In addition to the input plug 32, the cable 30 includes a first terminal 34a, a second terminal 34b, a first signal line L1, a first ground line Lg1, a second signal line L2, a second ground line Lg2, and a third signal line L3. Is provided.

  The input plug 32 is a stereo pin jack and is configured to be detachable from a socket to which an audio signal is supplied. The input plug 32 includes a first terminal 32a, a second terminal 32b, and a ground terminal 32c. A first audio signal S1 is applied to the first terminal 32a, a second audio signal S2 is applied to the second terminal 32b, and a ground potential is applied to the ground terminal 32c.

  The first terminal 34a of the cable 30 is connected to the first housing 10a. The second terminal 34b is connected to the second housing 10b.

The first signal line L1 is laid between the input plug 32 and the first terminal 34a, and transmits the first audio signal S1. The first ground line Lg1 is paired with the first signal line L1, and is laid along the first signal line L1 between the input plug 32 and the first terminal 34a.
That is, one end of the first signal line L1 is connected to the first terminal 32a of the input plug 32, and one end of the first ground line Lg1 is connected to the ground terminal 32c of the input plug 32.

  Similarly, the second signal line L2 is laid between the input plug 32 and the second terminal 34b and transmits the second audio signal S2. The second ground line Lg2 is paired with the second signal line L2, and is laid along the second signal line L2 between the input plug 32 and the second terminal 34b.

  The third signal line L3 is laid between the first terminal 34a and the second terminal 34b via the input plug 32 in parallel with the first signal line L1 and the second signal line L2.

  The first signal line L1, the first ground line Lg1, the second signal line L2, the second ground line Lg2, and the third signal line L3 are covered with an insulator (not shown). That is, a set of the first signal line L1, the first ground line Lg1, and a part L3a of the third signal line L3, and a set of the second signal line L2, the second ground line Lg2, and a part L3b of the third signal line L3. Respectively form a single wiring in appearance.

  In FIG. 2, the cable 30 is shown as a V-shaped wiring having the input plug 32 as a vertex, but it may be Y-shaped. Or the wiring of another shape may be sufficient.

  The first drive circuit 20a on the first housing 10a side is supplied with power from the battery 12 via the switch SW1 and the wiring L4 laid in the first housing 10a. On the other hand, the second drive circuit 20b on the second housing 10b side receives power supply from the battery 12 through the third signal line L3.

  By using the cable 30 according to the embodiment, it is not necessary to lay a power supply wiring for supplying a battery voltage from the first housing 10a to the second housing 10b in the arm 10c. The degree of freedom in designing the arm 10c is increased. Alternatively, since the arm 10c need not be provided, design restrictions are alleviated, which contributes to the provision of the headphone 100 with high design.

  Further, by forming the power supply wiring as the third signal line L3 laid in parallel with the first signal line L1 and the second signal line L2 inside the cable 30, the possibility of disconnection of the power supply wiring can be reduced. This is because the cable 30 is formed of an insulating member having high strength and flexibility.

  Although the case where the cable 30 according to the embodiment is used for the headphone 100 with a noise canceling function has been described, the use of the cable 30 is not limited to this, and a power source is mounted on one housing and the other housing is mounted. It can be used for various headphones that use the power supply voltage in the body. Furthermore, the use of the third signal line L3 of the cable 30 is not limited to the transmission of the power supply voltage, but may be used for the transmission of any other signal.

  In the embodiments, stereo type headphones have been described, but the present invention can also be applied to monaural headphones. In this case, the shape of the input plug 32 may be changed.

  Although the present invention has been described above based on the embodiments, it should be understood that the embodiments merely illustrate the principles and applications of the present invention, and the embodiments are within the scope of the claims. Needless to say, many modifications and arrangements can be made without departing from the concept of the present invention.

It is a figure which shows the structure of the headphones with a noise canceling function. It is a figure which shows the structure of the headphones which concern on embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Headphone, 10a ... 1st housing | casing, 10b ... 2nd housing | casing, 30 ... Cable, 32 ... Input plug, 34a ... 1st terminal 32, 34b ... 2nd terminal, L1 ... 1st signal wire | line, Lg1 ... 1st 1 ground line, L2 ... 2nd signal line, Lg2 ... 2nd ground line, L3 ... 3rd signal line, 12 ... battery, 14a ... 1st speaker, 14b ... 2nd speaker, 16a ... 1st microphone, 16b ... 1st 2 microphones, 20a ... first drive circuit, 20b ... second drive circuit, 22 ... microphone amplifier, 24 ... phase adjustment circuit, 26 ... speaker amplifier, R1 ... addition resistor, R2 ... addition resistor.

Claims (5)

A headphone that converts an audio electrical signal output from a sound source into an acoustic signal,
A battery, a first speaker, a first microphone, and a first drive that drives the first speaker by superimposing an audio signal collected by the first microphone on the input first audio signal by inverting the phase. A first housing including a circuit;
A second speaker, a second microphone, and a second drive circuit for driving the second speaker by superimposing the audio signal collected by the second microphone on the input second audio signal by inverting the phase thereof; A second housing including:
A cable for distributing the first and second audio signals output from the sound source to the first and second housings;
With
The cable is
A detachable input plug,
A first terminal to be connected to the first housing;
A second terminal to be connected to the second housing;
A first signal line laid between the input plug and the first terminal for transmitting the first audio signal;
A first ground line laid between the input plug and the first terminal and paired with the first signal line;
A second signal line laid between the input plug and the second terminal for transmitting the second audio signal;
A second ground line laid between the input plug and the second terminal and paired with the second signal line;
A third signal line laid between the first terminal and the second terminal in parallel with the first signal line and the second signal line via the input plug;
With
The first drive circuit is supplied with power from the battery via a wiring laid in the first housing,
The headphone characterized in that the second drive circuit receives power supply from the battery via the third signal line. The first and second drive circuits are respectively
A microphone amplifier that amplifies the output of the corresponding microphone;
A phase adjustment circuit for adjusting the phase of the output of the microphone amplifier;
A speaker amplifier that amplifies the output of the phase adjustment circuit;
A signal adding circuit that superimposes the output of the corresponding speaker amplifier on the corresponding audio signal and outputs the signal to the corresponding speaker;
The headphone according to claim 1, comprising: A headphone cable for connecting a headphone having a first housing and a second housing to a sound source,
A detachable input plug,
A first terminal to be connected to the first housing;
A second terminal to be connected to the second housing;
A first signal line laid between the input plug and the first terminal for transmitting a first audio signal;
A first ground line laid between the input plug and the first terminal and paired with the first signal line;
A second signal line laid between the input plug and the second terminal for transmitting a second audio signal;
A second ground line laid between the input plug and the second terminal and paired with the second signal line;
A third signal line laid between the first terminal and the second terminal in parallel with the first signal line and the second signal line via the input plug;
A headphone cable characterized by comprising:   The headphone cable according to claim 3, wherein the third signal line is used to form the same potential in each of the first casing and the second casing.   The third signal line is used to supply a voltage of a battery mounted on one of the first and second casings to the other casing. Headphone cable.

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