JPH0314815Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of a feedback volume device in a sound reproducing device, particularly a car stereo or the like.

[Conventional technology]

An example of this type of device in a conventional car stereo is the one shown in FIG.

In other words, 1 is a car stereo main body, and this car stereo main body 1 includes a music source 2 such as a tape deck or tuner, preamplifiers 3 and 4 for amplifying the left and right audio signals obtained from the music source 2, and There are built-in fader volumes 5 and 6 that divide the outputs of the preamplifiers 3 and 4 into volumes in the front and rear directions.

The left and right input terminals of a power amplifier 9 for rear output are connected to the rear output terminal 7 of the feeder volume 5 for left channel control, and the rear output terminal 8 of the feeder volume 6 for right channel control. Front output terminal 10 of the feeder volume 5 for channel control, and front output terminal 1 of the feeder volume 6 for right channel control.
1, the left and right input terminals of a front output power amplifier 12 are respectively connected.

Generally, in this type of car stereo equipment,
A configuration is adopted that includes a car stereo main body 1 and a power amplifier 9 for rear output, and supplies output from the power amplifier 9 to left and right speakers (not shown) attached to a rear parcel tray or the like of the car.

In the next step, the vehicle is upgraded to include a front output power amplifier 12 to supply output to left and right speakers (not shown) provided on the front side of the vehicle.

However, at the stage where the car stereo body 1 and the rear output power amplifier 9 described above are provided, the feeder volumes 5 and 6 are in a state where the outputs of the preamplifiers 3 and 4 are directly divided, and the feeder volumes 5 and 6 are mistakenly , the inconvenience arises that the total output changes.
Furthermore, if the feeder volumes 5 and 6 are set toward the front side without realizing it, the problem arises that the output from the car stereo body 1 is not sufficiently supplied to the rear output power amplifier 9.

[Purpose of this invention]

This idea is an attempt to eliminate the disadvantages of the conventional ones mentioned above, and when the front output power amplifier is not connected to the car stereo, the preamp output of the car stereo is directly sent to the rear without going through the feeder volume. It is configured so that it is supplied to the output power amplifier, and when the front output power amplifier is connected to the car stereo body, the audio output is supplied to the rear and front output power amplifiers via the feeder volume. This is what I did.

[Example of the present invention]

FIG. 1 shows an embodiment of this invention. In FIG. 1, the same reference numerals as in FIG. 2 indicate the same parts, and the explanation thereof will be omitted.

Inside the car stereo body 1 is a relay 13 consisting of a relay coil L and two sets of changeover switches S ₁ and S ₂ .
A current is supplied to the coil L of this relay 13 via a terminal 14 to which a power supply +B is connected at the same time when the front output power amplifier 12 is connected. By supplying current from the power supply +B, the changeover switches S ₁ and S ₂ become in the state shown in the figure, and the left and right channel signals supplied from the preamplifiers 3 and 4 are routed through the feeder volumes 5 and 6 to the respective terminals 7. , 8 and 10, 11.

In addition, when the front output power amplifier 12 is not connected, the connections to the terminals ₁₀ , 11, and 14 are cut off, and therefore the power supply to the relay coil L _is also stopped. are switched in the opposite direction, so that the outputs of preamplifiers 3 and 4 are directly delivered to terminals 7 and 8 for supply to rear output power amplifier 9 without passing through fader volumes 5 and 6, respectively.

In the embodiment shown in FIG. 1, when the rear output power amplifier 9 is connected to the car stereo main body 1, the power supply +B is simultaneously connected to the car stereo main body 1.
When the rear output power amplifier 9 is connected to the car stereo main body 1, the preamplifiers 3 and 4 of the main body 1 are provided.
The power supply +B is supplied to the terminal.

〔effect〕

This idea is structured as above, so
By connecting at least the front output power amplifier to the car stereo main body, left and right signals are supplied to the rear and front output power amplifiers via the feeder volume inside the main body, and the front output power amplifier When not connected, the preamplifier output is supplied to the rear output power amplifier without going through the feeder volume.

Therefore, even though the front output power amplifier is not used as in the prior art, the feeder volume operates and problems such as insufficient output being supplied to the rear output power amplifier can be prevented from occurring.

Although the illustrated example of the present invention shows a relay equipped with a coil and a switch that is switched when the coil is energized, it is also possible to use a combination of a switching circuit that detects energization and an analog switch that is turned on and off by this switching circuit. The same effect can be expected even if electronic relay means is used.

[Brief explanation of drawings]

FIG. 1 is a wiring diagram showing an embodiment of this invention, and FIG. 2 is a wiring diagram showing an example of a conventional one. 1... Car stereo body, 2... Music source, 3, 4... Preamplifier, 5, 6... Feeder volume, 7, 8, 10, 11... Output terminal, 9... Rear output power amplifier , 12... Front output amplifier, 13... Relay.

Claims (1)

[Claims for Utility Model Registration] In a sound reproduction device that reproduces a volume signal from a music source, a first output terminal and a second output terminal that output the reproduction signal from the sound reproduction device to two systems; A fader volume whose both ends are connected to the first output terminal and the second output terminal, and an amplifier for amplifying the reproduced signal of the sound reproducing device are connected to the second output terminal. A feeder volume device for a sound reproducing machine, comprising: switching means for supplying the playback signal of the sound reproducing machine, which has been supplied to a first output terminal, to the feeder volume.