JPH0742265U - TV audio adapter with infrared sensor - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The sound of the speaker is output only when a person is near the speaker, and the volume is automatically cut off when the person leaves the speaker.
On top of that, it is possible to hear from the speaker with the volume amplified the audio signal from the earphone jack. [Structure] Identification means for detecting a human body for detecting the proximity or separation of a person provided on an adapter, and an audio signal switching means for connecting to the identification means for a human body and adjusting the volume of a volume amplification circuit when a person leaves It has a switching circuit and makes the speaker sound only when a person is near the adapter.
When you leave, the sound of the speaker is automatically cut off. Also, the audio signal from the earphone jack can be heard from the speaker at a volume suitable for amplification, and moreover, because the signal is amplified by the adapter, multiple earphones can be connected and at the same time, multiple people can listen with the earphone.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a TV audio adapter, detects when a person is near or away, and automatically reduces the audio output of the speaker when the human body moves away from the speaker. It concerns audio adapters.

[0002]

[Prior art]

 Conventionally, when one listens to the sound of television, when one person listens to the earphone, there is only one earphone jack, and it is inconvenient for the other person to hear the sound.

[0003]

[Problems to be solved by the device]

 For this reason, when listening to the sound of conventional televisions with earphones, it was not possible for more than one person to listen at the same time. Also, I could not listen at a sufficient volume to listen to the speaker by connecting the speaker instead of the earphone. That is, in order to sound the speaker with the audio signal taken out from the earphone jack, the audio signal had to be amplified. Furthermore, when listening from the speaker, if the person listening to the speaker leaves, the speaker will not ring and annoy other people indoors and outdoors.

The present invention has been made in order to solve the above problems, and an object of the present invention is to produce a sound from a speaker only when a person is near the speaker, and to automatically reduce the volume when a person is away from the speaker. In addition, by amplifying the audio signal from the earphone jack, you can hear from the speaker at an appropriate volume, and the volume of the speaker is automatically reduced when the person who is listening from the speaker leaves The adapter for use is provided.

[0005]

[Means for Solving the Problems]

 The present invention has been made to solve the above problems, and in the invention described in "Claim 1," a low-frequency amplifier circuit for amplifying an audio output taken out from a headphone jack of a television and the low-frequency amplifier circuit. A volume amplification circuit including a volume controller and a power amplifier connected to the amplification circuit, identification means for detecting a human body approaching or separating a person, which is connected to the volume amplification circuit, and the identification means for the human body. It is characterized in that it is composed of a switching circuit for switching the audio signal, which is provided for controlling the volume of the volume amplification circuit when a person is separated from the volume.

[0006]

[Action]

 According to the television audio adapter with the infrared sensor having the above-mentioned configuration, the identification means for detecting a human body and the identification means for a human body, which are arranged on the adapter and detect the proximity or separation of a person. It is equipped with a switching circuit for switching audio signals, which is provided to adjust the volume of the volume amplification circuit when a person is connected and separated, so that the speaker emits the sound only when the person is near the adapter. When this happens, the sound of the speaker can be automatically shut off. Furthermore, by amplifying the audio signal from the earphone jack, you can hear it from the speaker at a suitable volume, and because the signal is amplified by the adapter, you can connect multiple earphones and at the same time, multiple people listen to it with the earphone. You can

[0008]

【Example】

 An embodiment of a television sound adapter with an infrared sensor according to the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a circuit configuration used in the present invention, FIG. 2 is an enlarged view of a main part of a pyroelectric infrared sensor used in the present invention, and Table 1 is a table showing characteristics of the pyroelectric infrared sensor.

As shown in FIG. 1, the television audio adapter of the present invention comprises a low frequency amplifier circuit 1 connected to a headphone jack of a television and a sound volume amplifier circuit 2 connected to the low frequency amplifier circuit 1. The volume amplifying circuit 2 is connected to a switching circuit 2a, a switching circuit 2a, an identification circuit 4 for identifying a human body, and a pyroelectric infrared sensor 5 connected to the identification circuit 4. .

The low frequency amplifier circuit 1 is formed by the low frequency amplifier circuits (L, R) and the resistors (R1, R2). The resistors R1 and R2 are a mixer that converts a stereo signal into a monaural signal. The low frequency amplifier circuit 1 is further connected to a volume amplifier circuit 2 in which a switching circuit 2a, a volume controller (RV) 2b and a power amplifier 2c are formed in series. The volume amplification circuit 2 is connected to a speaker 3a and a switch mechanism 3b for switching a plurality of earphone jacks 3d. The switch mechanism 3b is composed of an earphone jack and an earphone. In other words, when the earphone is inserted into the earphone jack, it is not connected to the speaker and is output to the earphone. Also, when the earphone is not inserted in the earphone jack, it outputs to the speaker and not to the earphone. A protective resistor (R3) is connected between the power amplifier 2c and the switch mechanism 3b.

The switching circuit 2a formed in the volume amplification circuit 2 has a comparator 4a, a rectifier circuit 4b, a bandpass filter 4c, and an amplifier 4d connected in series, and thus detects the proximity and separation of the human body. It is connected to the identification circuit 4. A pyroelectric infrared sensor 5 including a pyroelectric infrared sensor 5a, a slit 5b, a chopper 5c, and a temperature sensor 5d is connected to the identification circuit 4 for the human body. The temperature sensor 5d is further connected to the comparator 4a. Insert the TV audio adapter with infrared sensor configured as described above into the earphone jack (headphone jack) of the TV, etc., via the stereo plug 6.

The internal structure of the pyroelectric infrared sensor 5a is configured as shown in FIG. The inside of the case 6d, which is formed by the cap 6b whose front surface is closed by the window member 6a and the stem 6c, is composed of the blackening film 7a, the sensing element 7b, the alumina substrate 7c, and the FET 7d. , A source terminal 8b and a drain terminal 8c are projected. As the pyroelectric material, those shown in Table 1 were used, and the physical property constants are as shown. The human body identification circuit has a function of identifying the human body signal caught by the pyroelectric infrared sensor 5a as a human body pattern.

The television audio adapter with an infrared sensor having the above-described configuration is used as follows. Insert the stereo plug 6 into an earphone jack (headphone jack) of a television or the like and take out an audio signal of the television or the like. If the signal is stereo, it is amplified by the low frequency amplifiers R and L, respectively. After that, both signals are mixed via the resistors R1 and R2 to form a monaural signal. When the television audio signal is a monaural signal, the low frequency amplifiers R and L amplify the monaural signal. The amplified signal passes through the switching circuit 2a, the volume controller (VR) 2b, and the power amplifier 2c. The signal power-amplified by the power amplifier 2c is sent to the speaker 3a or the earphone jack 3d. The resistor (R3) 9 is a dummy resistor when the earphone is not attached to the earphone jack 3d.

When switching the speaker 3a and the earphone jack 3d, when the earphone is inserted into the earphone jack 3d, the speaker circuit is cut off by the switch mechanism 3b (spring type) and output to the earphone jack 3d side. The earphone is removed from the earphone jack 3d and output to the speaker 3a by the switch mechanism 3b. A plurality of earphone jacks 3d are formed so that a plurality of people can simultaneously output and listen to television sound with the earphones. And no matter which earphone jack 3d the earphone is inserted into, the circuit to the speaker 3a is cut off. Further, as a matter of course, if the earphone is inserted in any of the earphone jacks 3d, it is not output to the speaker 3a.

In the pyroelectric infrared sensor system 5, the chopper 5c chops the infrared rays radiated from the human body on the side of the speaker 3a, and the infrared rays are incident on the pyroelectric infrared sensor 5a through the slit 5b. The current flowing through the pyroelectric infrared sensor 5a is amplified by the amplifier 4d. The amplifier 4d is known in the pyroelectric infrared sensor 5a like the FET 7d. The bandpass filter 4c removes noise from the amplified signal and enters the rectifier circuit 4b to be converted into direct current. Then, the ambient temperature detected by the temperature sensor 5d is compared with the comparator 4a to determine whether or not there is a human body near the adapter. The output of the pyroelectric infrared sensor 5a is connected to the electronic switching circuit 2a. The electronic switching circuit 2a is turned on by a signal of "presence" of the human body and turned off by a signal of "absence" of the human body. I am doing it. Therefore, if there is a person near the adapter, the switching circuit 2a is turned on, so that the audio output of the television or the like is conducted and is output to the speaker 3a or the earphone jack 3d. On the other hand, if there is no person near the adapter, the switching circuit 2a is turned off, so that the audio output of the television or the like becomes non-conductive and is not output to the speaker 3a or the earphone jack 3d.

In the above embodiment, the description has been given as the TV audio adapter with the red 2-wire sensor that is connected to the earphone jack of the television, but the present invention is not limited to this, and may be a radio, stereo, tape recorder, compact disc. The same can be done as an audio adapter with an infrared sensor that is connected to an earphone jack such as a (CD). In addition, it is natural that a stereo signal can be amplified as a stereo signal without being converted into a monaural signal.

[0017]

[Effect of the present invention]

 As is apparent from the above-described structure, the television sound adapter with an infrared sensor of the present invention is an identification means for detecting a human body and an identification means for a human body, which are arranged on the adapter and detect the proximity or separation of a person. It is equipped with a switching circuit for switching the audio signal, which is provided to adjust the volume of the volume amplification circuit when a person is away from the speaker. When separated, the speaker volume is automatically cut off and the audio signal is amplified, so multiple people can simultaneously extract the audio signal with the earphones from the earphone jack and listen to the speaker at a volume suitable for the ear. It has various effects such as being able to do it.

[0018]

[Table 1] Is a table showing the characteristics of the pyroelectric infrared sensor used in the present invention.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circuit configuration used in the present invention.

FIG. 2 is an enlarged view of a main part of a pyroelectric infrared sensor used in the present invention.

[Explanation of symbols]

 1 ... Low frequency amplifier circuit 2 ... Volume amplifier circuit 2a ... Switching circuit 4 ... Identification circuit 5 ... Pyroelectric infrared sensor 6 ... Stereo plug

Claims (1)

[Scope of utility model registration request] 1. A low frequency amplifier circuit for amplifying an audio output taken out from a headphone jack of a television, a volume amplifier circuit comprising a volume controller and a power amplifier connected to the low frequency amplifier circuit, and the volume amplifier. Identification means for detecting the proximity or separation of a person, which is connected to the circuit, and an audio signal provided for adjusting the volume of the volume amplification circuit when the person is separated from the identification means for the body A TV audio adapter with an infrared sensor, which is composed of a switching circuit for switching.