JPH0142560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an audio device such as a headphone audio device that can prevent interruptions in monitor sound during remote control operation.

Conventional configurations and their problems Traditionally, when remote control operation is performed on audio equipment such as headphone audio, a transmitting/receiving device is required when a control terminal other than the headphone lead is provided, or when remote control operation is performed using ultrasonic control. However, the circuit structure is complicated and expensive.

For this reason, it is conceivable that the headphone lead or other electromechanical converter wiring lead can be used for remote control operation without requiring a dedicated lead for control other than the conventional headphone lead. However, if you operate the remote control during recording, the remote control switch opens the signal supply line from the power amplifier to the headphone speaker, making it impossible to monitor the audio signal.

Purpose of the Invention The present invention provides a method for performing remote control operations during recording using an electromechanical transducer wiring lead such as a headphone lead or an earphone lead without requiring a dedicated lead for control other than the conventional headphone lead. , since the audio signals of both channels must be monitored by the headphone speaker in any remote control operation state,
It is an object of the present invention to provide an audio device that can satisfy these requirements.

Structure of the Invention In order to achieve the above object, the present invention provides resistances between the output sides of the left and right power amplifiers and the power supply, and connects the output sides of the left and right power amplifiers to the left and right speakers of the headphone. A control switch is provided on each signal line of the wiring lead leading to ground, and the control switch is configured to detect changes in impedance on the output side of the power amplifier due to opening and closing of the control switch to control the controlled section. The left and right power amplifier outputs are normally supplied to the headphone speakers through the normally closed contacts, and when either control switch is operated, the power amplifier outputs are supplied to the headphone speakers through the normally open contacts. The configuration is such that the output of the other power amplifier is supplied. According to this configuration, when the headphone lead is also used for remote control operation, it is possible to prevent interruption of the monitor sound to the headphone or earphone due to opening and closing of the control switch provided between the headphone leads.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In the figure, reference numeral 1 denotes a main body of a recording device, and in the embodiment, a tape recorder with an auto-reverse function and a radio receiver is shown. 2 is the headphone,
A remote control device 4 is provided in the middle of the lead 3,
A headphone plug 5 is provided at the tip. The remote control device 4 includes two remote control switches _SW1 and a pause remote control _SW2 . and,
By inserting and connecting the electrodes 6, 7, 8 of the headphone plug 5 to the headphone jack 9 of the main body 1, the electrodes 6a, 7a, 8a of the jack 9 and the plug 5 can be connected as shown in FIG. Each electrode 6,
7 and 8 are connected to each other.
Next, the plug 5 is connected to the jack 9 based on FIG.
Explaining the circuit diagram when connected to
Points A and B are points from which control signals for mode control are taken out, and are connected to the electrolytic capacitors 13 and 14 for DC cut on the output side of the left and right power amplifiers 11 and 12 of the stereo, and the electrode 7 of the headphone jack 9.
It is between a and 8a. These points A and B are also resistance
It is connected to the power supply Vcc of the device body 1 via R ₁ and R ₂ , and is configured to cause voltage changes by opening and closing remote control switches SW ₁ and SW ₂ . That is, by opening the remote control switch _SW1 , the impedance between the point A and the ground changes from the impedance value due to the coil _L1 of the speaker _SP1 of the headphone 2 to a high impedance and becomes equal to the voltage Vcc at the point A. . On the other hand, the remote control switch
B by the same effect by opening SW ₂ .
The voltage at the point becomes equal to Vcc. In this way, voltage changes at points A and B are detected by opening and closing the remote control switches SW ₁ and SW ₂ .
The mode control circuit 1 is controlled by the control signal detected at the point
5 and 19 are driven. Here, the mode control circuit 15 is a control circuit for tape reversal, and is composed of a filter circuit 16 for removing an AC component or a noise component appearing at point A, an inversion signal detection circuit 17, and an inversion drive circuit 18. The mode control circuit 19 is a control circuit for pausing the movement of the mechanism, and is composed of a filter circuit 20 for removing an AC component or a noise component appearing at point B, and a pause signal detection drive circuit 21. Here, to explain the configuration of this remote control switch body, firstly, the two switches SW ₁ and SW ₂ inside the remote control switch are composed of two contacts, normally closed contact a and normally closed contact B. When recording the release signal, under normal conditions, the remote control switch SW ₁ ,
SW ₂ is located on the normally closed contact a side, and the recording signals of the L and R channels are transmitted straight through the remote control device 4 via the jack 9 and plug 5 to the speakers SP ₁ and SP ₂ of the headphone 2, and the recording signal is can be monitored. However, in this state, if we consider the case where either the remote control switch SW ₁ or SW ₂ of the remote control device 4 is opened and switched to the normally open contact b side, first only the remote control switch SW ₁ is opened and then the normally open contact is switched to the B side. When the switch is set to contact b, the tape reversal function of this switch operates normally, but the recording signal for monitoring to speaker SP ₁ on this line is interrupted. Therefore, in order to drive the speaker SP 1 by supplying the signal on the other line to the speaker SP ₁ via the normally open contact b of the remote control switch SW ₁ , the remote control switch SW ₁ is connected after the normally closed contact a of the remote control switch SW ₁ . ₁ normally closed contact b is connected. At this time, the speaker SP ₁ of the headphone 2,
With SP ₂ , the recording signal is monaural but can be monitored. On the other hand, if remote control switch SW ₁ remains in its normal state, that is, normally closed contact a, and only remote control switch SW ₂ is opened to make normally open contact b, the recording signal on the other line will be transmitted through normally closed contact b, as described above. Since it is connected after remote control switch SW ₂ , it can be monitored using headphone 2. At this time, the tape pause function of remote control switch SW ₂ operates normally.

Effects of the Invention As is clear from the embodiments, the present invention does not require a new dedicated lead for controlling the controlled part of the audio device main body, and uses the wiring lead of an electromechanical transducer such as a speaker or earphone. It is extremely useful in practical use for audio equipment such as headphone audio because it allows remote control control by using the remote controller and prevents interruptions in the monitoring sound to the electromechanical transducer when operating the remote controller during recording. It is something.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a headphone audio device that is an embodiment of the present invention, and FIG. 2 is a circuit diagram based on this embodiment. 1...Audio equipment body, 2...Headphone, 3...
...Lead, 4...Remote control device, SW ₁ , SW ₂ ...
Control switch, 11, 12, 26...Power amplifier, 15, 19, 28...Controlled section, _R1 , _R2 ...Resistor, A, B...Impedance change detection point.

Claims (1)

[Claims] 1. Install a resistor between the output side of the left and right power amplifiers and the power supply, and connect a control switch to each signal line of the wiring lead from the output side of the left and right power amplifiers to the ground via the left and right speakers of the headphone. The control switch is configured to detect a change in impedance on the output side of the power amplifier due to opening and closing of the control switch, and to control the controlled section using the detected control signal, and the control switch has a normally closed contact and a normally open contact. Normally, the left and right output signals are supplied to the headphone speaker through the normally closed contact, and when one control switch is operated, the other signal is supplied to the headphone speaker through the normally open contact. An audio device characterized in that it is connected so that a signal can be supplied from a line.