JP2014049961A - Amplifier with speaker and audio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an amplifier with a multifunctional speaker which can prevent collision with a vehicle for reasons that ears of the user are closed up with earphones and which also can be used as a hearing aid or a loudspeaker.SOLUTION: An amplifier with speaker 1 comprises: a first external connection terminal 11 capable of connecting a first cable 2 for inputting an audio signal from an audio device 5; a second external connection terminal 12 capable of connecting a second cable 3 for inputting a sound signal from a microphone 6 and for supplying the power needed for the operation of a built-in amplification circuit of the microphone 6 from a built-in battery of the amplifier with speaker 1; a signal input circuit for imparting a mixture of the audio signal taken in by the first external connection terminal 11 and the sound signal taken in by the second external connection terminal 12 to an amplifier; and a third external connection terminal 13 capable of connecting a third cable 4 for outputting the output amplified by the amplifier to an earphone or a headphone 7.

Description

  The present invention relates to an amplifier with a speaker in which a speaker is integrated, and an audio apparatus configured using the amplifier with a speaker.

  The applicant previously proposed an amplifier 9 with a speaker having the configuration shown in FIG. 5 (see, for example, Patent Document 1). In the illustrated amplifier 9 with speaker, a speaker 91 is provided on one side of a box-shaped main body case 90, and first and second external connection terminals 92, 93 are provided on one end surface, respectively. Each of the external connection terminals 92 and 93 is constituted by a jack, and one external connection terminal 92 is connected to a mobile phone 95 or an audio device 96 via a cable 94, and the other external connection terminal 93 is connected to an earphone or headphones. It is possible. In the figure, 97 and 98 are plugs attached to both ends of the cable 94. One plug 97 is connected to the connection terminal 99 of the cellular phone 95 and the audio device 96, and the other plug 98 is the amplifier 9 with the speaker. Each is inserted into the first external connection terminal 92.

  If the mobile phone 95 is connected to the above-mentioned amplifier 9 with speaker, the hands-free device of the mobile phone 95 is constituted by the speaker 91 of the amplifier 9 with speaker and the microphone built in the mobile phone 95. The audio device 96 includes an earphone-only digital audio player that does not have a built-in speaker, a mini-radio that has a small output speaker, and the like. The signal is captured and amplified, converted into sound by the speaker 91, and output to the outside.

JP 2011-114650 A

  By the way, multifunctional mobile phones called “smartphones” are provided with earphone dedicated terminals for listening to music and the like. However, if you wear earphones on your ears to enjoy music while walking, the earphones will block out surrounding sounds, so you will not notice the approach of the vehicle and may cause a collision with the vehicle. .

  The present invention has been made paying attention to the above-described problem, and enables connection of a microphone to allow ambient sounds collected by the microphone to be output from headphones and earphones together with sound from an audio device. To provide an amplifier with a multi-function speaker that can be used as a hearing aid or a loudspeaker, and an audio device configured using the amplifier with the speaker. With the goal.

  The amplifier with a speaker according to the present invention includes an amplifier for amplifying an externally input signal and a battery for supplying power necessary for the operation of the amplifier, and converts the amplified output from the amplifier into sound. A first external connection terminal capable of connecting a first cable for inputting an audio signal from an audio device, and an audio signal from a microphone. And a second external connection terminal capable of connecting a second cable for supplying the power necessary for the operation of the amplifier circuit built in the microphone from the battery, and the first external connection terminal. A signal input circuit that mixes an audio signal and an audio signal captured from a second external connection terminal and applies the mixed signal to the amplifier; and the amplification It is intended that comprising a third external connection terminal capable of connecting the third cable for outputting an amplified output to the earpiece or headphones by.

By selecting and connecting an audio device, a microphone, an earphone, or a headphone to any one of the first to third external connection terminals of the amplifier with a speaker having the above-described configuration, it can be used for various applications.
When a microphone is connected to the second external connection terminal, power is supplied to the microphone from the battery built in the amplifier with the speaker, and the microphone amplification circuit operates. When sound is input to the microphone, the sound signal is amplified by the amplifier circuit and taken into the amplifier with the speaker, and the sound is output from the speaker through the signal input circuit and the amplifier. Therefore, if a speaker connected to the amplifier according to the present invention is connected to a microphone, it can be made to function as a loudspeaker.

  When an earphone is further connected to the third external connection terminal, surrounding sounds such as voice collected by the microphone are amplified by an amplifier circuit and taken into an amplifier with a speaker, and output from the earphone via a signal input circuit and an amplifier. Therefore, if a microphone and an earphone connected to the amplifier with a microphone according to the present invention is carried, it can be used as a hearing aid.

  On the other hand, when an audio device is connected to the first external connection terminal, an audio signal from the audio device is converted into sound by a speaker through a signal input circuit and an amplifier, and is output. Even a digital audio player can listen to sound through the speaker of an amplifier with a speaker without using an earphone.

  Furthermore, when an audio device, a microphone, an earphone, or a headphone is connected to each of the first to third external connection terminals, the audio signal captured from the first external connection terminal and the second external connection terminal are captured. Since the audio signal is mixed with the signal input circuit and supplied to the amplifier, it is possible to listen to surrounding sounds such as the voice collected by the microphone while listening to music or the like with the earphone or the headphone. Therefore, even if the ear is blocked by earphones or headphones when listening to music or the like, it is possible to notice the approach of the vehicle and avoid a collision with the vehicle.

  In a preferred embodiment of the present invention, the second cable includes an earth line, a signal line for inputting an audio signal from the microphone, a power supply line for supplying power from the battery to the microphone, and each line. When the plug is inserted into and removed from the jack constituting the second external connection terminal, the signal input circuit is short-circuited between the power supply line and the ground line. And a disconnection prevention circuit for preventing disconnection by interrupting the supply of power from the battery to the power supply line.

  According to this embodiment, it is possible to prevent the occurrence of a disconnection accident due to a short circuit caused by supplying power to the microphone from the battery built in the amplifier with the speaker. In addition, since it is not necessary to incorporate a battery necessary for the operation of the amplifier circuit into the microphone, power can be supplied by a single battery built in the amplifier with the speaker.

  In a further preferred aspect of the present invention, the signal input circuit includes a noise regulation circuit that regulates that low-frequency noise input from a microphone and audio equipment is taken into the amplifier.

  According to this embodiment, since the noise in the low frequency region input from the microphone and the audio device is not amplified by the amplifier, the audio signal from the audio device and the audio signal from the microphone are mixed and output from the headphones or earphones. The sound is clear and can prevent adverse effects such as reverberation.

  The amplifier with a speaker described in any of the above is connected to the first external connection terminal of the amplifier with speaker via the first cable, and the second is connected to the second external connection terminal of the amplifier with speaker. When combined with a microphone connected via a cable and headphones or earphones connected via a third cable to a third external connection terminal of an amplifier with a speaker, an audio device capable of obtaining the desired effect described above is obtained. It is composed.

  In an audio device according to a preferred embodiment, the microphone includes a variable resistor provided for adjusting sensitivity in a built-in amplifier circuit, and a knob capable of external operation for changing the resistance value of the variable resistor. Have.

  According to this embodiment, when listening to music or the like outdoors, such as when walking, if the sensitivity of the microphone is increased by operating the knob and the surrounding sound is also taken in, the vehicle approaches, Can avoid collision accidents. In addition, when listening to music in the room, if the sensitivity of the microphone is lowered by operating the knob, ambient sounds are not captured.

  In a further preferred embodiment, the knob has a disk shape and has a notch formed on the outer peripheral surface over the entire circumference, and an operation display is provided in the notch so that the knob can be intermittently fed by a turning operation. The LED is engaged.

  According to this embodiment, when the knob is turned, it is intermittently fed, so that it is possible to finely adjust the sensitivity by the knob, and since the operation display LED is also used as the intermittent feed mechanism of the knob, the structure is complicated. There is no risk of high costs.

According to the present invention, since the microphone can be connected and the sound from the microphone can be output from the speaker, the headphone, or the earphone, a function as a hearing aid or a loudspeaker is added, and a multi-function can be achieved. Also, when listening to music with headphones or earphones, ambient sounds collected by the microphone can also be output from the earphones, so even if the ears are blocked by headphones or earphones, the surrounding sounds are blocked No collision accidents with vehicles etc. can be avoided.
In addition, since the power necessary for the operation of the amplifier circuit built in the microphone is supplied from the battery built in the amplifier with the speaker, it is not necessary to incorporate the battery in the microphone, and the structure can be simplified and the cost can be reduced.

It is explanatory drawing which shows the structure of the amplifier with a speaker which is one Example of this invention, and the structure of the audio apparatus comprised using the amplifier with a speaker. It is a front view which expands and shows a microphone. It is an electric circuit diagram which shows the circuit structure of the amplifier with a speaker. It is an electric circuit diagram which shows the circuit structure of the Example in which the noise control circuit was incorporated. It is explanatory drawing which shows the structure of the conventional amplifier with a speaker.

  FIG. 1 shows a configuration of an amplifier 1 with a speaker according to an embodiment of the present invention and an audio device configured using the amplifier 1 with a speaker. In the illustrated amplifier 1 with a speaker, a speaker 14 and a battery housing portion 15 are provided on one side of a box-shaped main body case 10, and first to third external connection terminals 11 to 13 and an operation display are provided on one end surface. LED 17 for each is provided. The battery accommodating portion 15 in the illustrated example has a size capable of accommodating two dry batteries, and the battery can be taken in and out by opening and closing the cover plate 16.

The audio device 5 is connected to the first external connection terminal 11 via the first cable 2, the microphone 6 is connected to the second external connection terminal 12 via the second cable 3, and the third external connection terminal 13 is connected. Are connected to a headphone 7 or an earphone (not shown) via a third cable 4.
The first to third external connection terminals 11 to 13 are constituted by jacks J1 to J3. On the other hand, the first to third cables 2 to 4 have three poles that can be inserted into and removed from the jacks J1 to J3. Plugs P1 to P3 are respectively attached. Although the three-pole plugs P1 to P3 are not shown, the tip side is called a tip, the root side is called a sleeve, and the middle is called a ring, and each is insulated by an insulating ring.

  Mini stereo cords are used as the first to third cables 2 to 4. The three-pole plug P1 that can be inserted into the first jack J1 of the speaker-equipped amplifier 1 is connected to one end of the first cable 2, and the external connection terminal (jack) 51 of the audio device 5 is inserted to the other end. Each of the three-pole plugs P4 is mounted. The audio equipment 5 includes a multi-function mobile phone, a music player, a voice recorder, a one-segment TV, a pocket radio, and the like.

  The second cable 3 is connected to the microphone 6, and a three-pole plug P <b> 2 that can be plugged into the second jack J <b> 2 of the amplifier with speaker 1 is attached to the tip of the second cable 3. The microphone 6 in the illustrated example is one in which a printed circuit board on which a capacitor microphone 61 and an amplifier circuit 62 shown in the electric circuit diagram of FIG. 3 are mounted is incorporated in a case made of synthetic resin. The amplifying circuit 62 includes a variable resistor VR for adjusting sensitivity, and the resistance value of the variable resistor VR can be changed by an external operation on the upper surface of the case 60 shown in an enlarged manner in FIG. A knob 63 is provided. The knob 63 has a disc shape and is pivotally supported at its center part. A knurled step 64 is formed on the outer circumferential surface of the knob 63, and an operation display LED 65 is engaged with the step 64 so that the knob 63 can be intermittently fed. In the figure, reference numeral 66 denotes a sound collection port for taking in ambient sounds such as sound into the case 60. Although not shown, a hook for attaching the microphone 6 to an appropriate position such as the chest is provided on the back side of the case 60.

  Returning to FIG. 1, the third cable 4 is connected to the headphones 7, and a three-pole plug P <b> 3 that can be inserted into the third jack J <b> 3 of the amplifier 1 with the speaker is connected to the tip of the third cable 4. It is installed. Although not shown, an earphone can be used instead of the headphone 7.

FIG. 3 shows the configuration of the amplifier circuit 62 incorporated in the microphone 6 and the configuration of the control circuit 8 incorporated in the amplifier 1 with speaker.
The control circuit 8 of the amplifier with speaker 1 includes an amplifier 80 for amplifying a signal input from the outside, a battery 81 for supplying power necessary for the operation of the amplifier 80, and a stereo audio signal from the audio device 5. A signal input circuit 82 that mixes i _L and i _R and the audio signal k from the microphone 6 and supplies the mixed signal to the amplifier 80 is included. A plurality of coupling capacitors C5 to C9 are used for the signal input circuit 82, and each of the capacitors C5 to C9 has a DC component for the audio signal k, the audio signals i _L and i _R and a signal obtained by mixing them. And only the AC component is allowed to pass.

In FIG. 3, J1 is a jack constituting the first external connection terminal 11 for inputting the audio signals i _L and i _R from the audio device 5, and the first plug P 1 attached to the first cable 2. Is inserted. J2 is a jack constituting the second external connection terminal 12 for inputting the audio signal k from the microphone 6 and supplying the power necessary for the operation of the amplification circuit 62 built in the microphone 6 from the battery 81. The second plug P2 attached to the second cable 3 is inserted. J3 is a jack constituting the third external connection terminal 13 for outputting the amplified output from the amplifier 80 to the headphone 7 or the earphone, and the third plug P3 attached to the third cable 4 is inserted. The amplified output of the amplifier 80 is converted into sound by the speaker 14 and output. When the headphone 7 or the earphone is connected to the jack J3, the amplified output is converted to sound by the headphone 7 or the earphone.

  The second cable 3 includes a ground line E, a signal line R for sending an audio signal k from the microphone 6 to the amplifier 1 with a speaker, and a power source for supplying power from the battery 81 to the amplifier circuit 62 of the microphone 6. Supply line L. The amplifying circuit 62 of the microphone 6 operates upon receiving power from the speaker-equipped amplifier 1 via the power supply line L, and the amplified audio signal k is sent to the speaker-equipped amplifier 1 via the signal line R. send. Note that the voice signal k is a signal obtained by converting a human voice, surrounding sounds, etc. into an electrical signal and amplified by the amplifier circuit 62. The voice signal k indicates a human voice exclusively according to the use of the amplifier 1 with a speaker. Or a signal exclusively indicating the surrounding sound.

  The capacitor microphone 61 used in the microphone 6 has a capacitance that changes depending on the intensity of sound. When a voltage is applied to the capacitor microphone 61 by the resistor R1, the capacitance change of the capacitor microphone 61 changes as a voltage change via the capacitor C1. The audio signal k is extracted. TR1 to TR3 are amplification transistors, and the size of the variable resistor VR is changed by turning the knob 63, whereby the amplification factor of the transistor TR2 is changed and the sensitivity is adjusted. When the resistance value of the variable resistor VR is reduced, the sensitivity increases and a large audio signal k can be extracted. When the resistance value of the variable resistor VR is increased, the sensitivity is decreased and the audio signal k is decreased. In the figure, C1 to C4 are coupling capacitors, which block the DC component and pass only the AC component. The amplifier circuit 62 of the capacitor microphone 61 is generally known, and a detailed description of the circuit configuration and the operation thereof is omitted here.

  The audio signal k from the microphone 6 is taken into the amplifier 1 with the speaker via the signal line R of the second cable 3, and the second plug P 2 attached to the second cable 3 is connected to the first amplifier 1 with the speaker 1. When the power supply line L and the ground line E of the second cable 3 are short-circuited, the power supply line L and the ground line E of the second cable 3 may rarely be short-circuited when being inserted into or removed from the jack J2 constituting the external connection terminal 12 of FIG. There is.

In order to prevent the occurrence of disconnection due to the short circuit, when the power supply line L and the ground line E are short-circuited in the signal input circuit 82 of the amplifier 1 with the speaker when the plug P2 is inserted into and removed from the jack J2, A disconnection prevention circuit 83 for cutting off the supply of power from the battery 81 to the power supply line L is provided.
The disconnection prevention circuit 83 in the illustrated example includes a power supply circuit 84 for supplying power from the battery 81 to the power supply line L via the resistor R3 and the transistor TR4, and a current output from the amplifier 80 via the resistor R2. And a current feedback circuit 85 applied to the base of the transistor TR4. When the power supply line L and the ground line E are short-circuited, the signal fed to the base of the transistor TR4 by the current feedback circuit 85 becomes a no-signal state. As a result, the transistor TR4 is turned off and the power supply circuit 84 is opened. In this state, the power supply to the power supply line L is stopped. In the figure, C10 to C12 are pulse voltage absorbing capacitors.

  FIG. 4 shows an embodiment in which a noise regulation circuit 86 is further provided in the signal input circuit 82 of the amplifier with speaker 1. The noise regulation circuit 86 is for regulating the low frequency region noise input from the microphone 6 and the audio device 5 from being taken into the amplifier 80. The noise regulation circuit 86 is connected to the first and second transistors TR5 and TR6 and the direct current. A blocking capacitor C13 and a current limiting resistor R4 are included. The first transistor TR5 is always given positive charge from the battery 81 to the base of the first transistor TR5 in order to limit noise input to the amplifier 80. As a result, the impedance between the emitter and the collector of the first transistor TR5 becomes close to zero, the signal input to the amplifier 80 is limited, and noise in the low frequency region input from the microphone 6 or the audio device 5 (for example, Input to the amplifier 80 is restricted.

When the audio signal k is input from the microphone 6 and the audio signals i _L and i _R are respectively input from the audio device 5 and the synthesized signal is applied to the base of the second transistor TR6, the second transistor TR6. , And the impedance between the emitter and collector of the transistor TR6 becomes small, so that the base potential of the first transistor TR5 becomes low, the impedance between the emitter and collector of the first transistor TR5 becomes large, and is input to the amplifier 80. The signal to be transmitted becomes large.

The first and second transistors TR5 and TR6 are repeatedly turned on and off according to the increase / decrease of the audio signal k from the microphone 6 and the audio signals i _L and i _R from the audio device 5, thereby producing reverberant sounds. It is suppressed that the noise in the low frequency region due to the noise is input to the amplifier 80 and amplified. As a result, the sound heard with the headphones 7 or the earphone becomes clear, and even if the sound is taken in and mixed from both the audio device 5 and the microphone 6, it is not difficult to hear.

By selecting and connecting the audio device 5, the microphone 6, the headphone 7 or the earphone to any one of the first to third external connection terminals 11 to 13 of the amplifier with speaker 1 having the above-described configuration, various applications can be achieved. Can be used.
When the microphone 6 is connected to the second external connection terminal 12, the power is supplied to the microphone 6 from the battery 81 built in the amplifier 1 with the speaker, and the amplifier circuit 62 of the microphone 6 operates. When sound or the like is input to the microphone 6, the sound signal k is amplified by the amplifier circuit 62 and sent to the speaker-equipped amplifier 1, and sound is output from the speaker 14 via the signal input circuit 82 and the amplifier 80. Therefore, if a microphone 6 connected to the speaker-equipped amplifier 1 according to the present invention is installed at various facilities, it can function as a loudspeaker.

  Further, when an earphone is further connected to the third external connection terminal 13, ambient sounds such as sounds collected by the microphone 6 are amplified by the amplifier circuit 62 and taken into the amplifier 1 with the speaker, and the signal input circuit 82 and the amplifier Since it is output from the earphone via 80, if an earphone connected to the amplifier with speaker 1 according to the present invention is carried, it can be used as a hearing aid.

On the other hand, when the audio device 5 is connected to the first external connection terminal 11, the audio signals i _L and i _R from the audio device 5 are converted into sound by the speaker 14 through the signal input circuit 82 and the amplifier 80 and output. Therefore, even a digital audio player dedicated to an earphone that does not have a built-in speaker 14 can listen to the sound by the speaker 14 of the amplifier 1 with a speaker without depending on the earphone.

Furthermore, when the audio device 5, the microphone 6, the headphone 7, or the earphone is connected to each of the first to third external connection terminals 11 to 13, the audio signal i _L , i captured from the first external connection terminal 11. _{Since R} and the audio signal k captured from the second external connection terminal 12 are mixed by the signal input circuit 82 and applied to the amplifier 80, the audio collected by the microphone 6 while listening to music or the like with the headphones 7 or the earphones. You can also hear surrounding sounds. Therefore, even when the ears are blocked by headphones 7 or earphones for listening to music or the like, the vehicle is noticed as approaching, and a collision accident with the vehicle or the like can be avoided.

DESCRIPTION OF SYMBOLS 1 Amplifier with a speaker 2 1st cable 3 2nd cable 4 3rd cable 5 Audio equipment 6 Microphone 7 Headphone 11 1st external connection terminal 12 2nd external connection terminal 13 3rd external connection terminal 14 Speaker 63 Knob 64 Step 65 LED for operation display
62 Amplifier circuit VR Variable resistor 80 Amplifier 81 Battery 82 Signal input circuit 83 Disconnection prevention circuit 86 Noise regulation circuit J1, J2, J3 Jack P1, P2, P3 Plug

Claims (6)

An amplifier for amplifying a signal input from the outside and a battery for supplying power necessary for the operation of the amplifier are incorporated, and a speaker for converting the amplified output from the amplifier into sound and outputting the sound is integrated. In an amplifier with a speaker,
A first external connection terminal to which a first cable for inputting an audio signal from an audio device can be connected, and a power supply for inputting an audio signal from the microphone and operating an amplifier circuit built in the microphone. A second external connection terminal to which a second cable to be supplied from the battery can be connected; an audio signal captured from the first external connection terminal; and an audio captured from the second external connection terminal. A signal input circuit for mixing the signal and supplying the signal to the amplifier; and a third external connection terminal capable of connecting a third cable for outputting the amplified output from the amplifier to the earphone or the headphone. An amplifier with a speaker.   The second cable includes a ground wire, a signal wire for inputting an audio signal from a microphone, a power supply wire for supplying power from the battery to the microphone, and three poles in which each wire is connected in an insulated state When the plug is inserted into and removed from the jack constituting the second external connection terminal, the signal input circuit is connected to the power supply line from the battery when the power supply line and the ground line are short-circuited. The amplifier with a speaker according to claim 1, further comprising a disconnection prevention circuit for interrupting power supply to prevent disconnection.   The amplifier with a speaker according to claim 1, wherein the signal input circuit includes a noise regulation circuit that regulates that low-frequency noise input from a microphone and audio equipment is taken into the amplifier.   An amplifier with a speaker according to any one of claims 1 to 3, an audio device connected to a first external connection terminal of the amplifier with a speaker via a first cable, and a second external of the amplifier with a speaker An audio device comprising: a microphone connected to a connection terminal via a second cable; and headphones or earphones connected to a third external connection terminal of an amplifier with a speaker via a third cable.   5. The microphone according to claim 4, further comprising: a variable resistor provided for adjusting sensitivity in a built-in amplifier circuit; and a knob capable of external operation for changing a resistance value of the variable resistor. Audio device.   The knob has a disk shape and has a notch formed on the outer peripheral surface over the entire circumference, and an operation display LED is engaged with the notch so that the knob can be intermittently fed by a rotating operation. Item 6. The audio device according to Item 5.

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