JPH02299395A - On-vehicle audio equipment - Google Patents

Abstract

PURPOSE:To drive a speaker of each channel by providing a source channel changeover circuit so as to output an audio signal from each of plural sources to speaker of each of front and rear side channels. CONSTITUTION:Switches 12a, 12b switch signals of L and R channels of a source A1 and a source B2 via a control circuit 3a in a source channel changeover circuit comprising analog switches 12a and 12b, and 13a and 13b. Then the switched L and R channel signals are outputted to rear side speakers 8, 9 via sound volume variable resistors 4a, 4b and amplifiers 5a, 5d. Moreover, signals of L and R channels of the sources A1, B2 switched by the switches 13a, 13b are outputted to front speakers 6, 7 via sound volume variable resistors 4b, 4d and amplifiers 5b, 5c. Thus, an audio signal is outputted from the sources A, B to each front and rear speaker to drive each speaker.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for controlling the output signal of a source (radio, tape, CD (compact disc), DAT (digital audio chip), etc.) by operating a specific switch.
The present invention relates to an in-vehicle audio device that outputs signals selectively to, for example, the front and rear sides of a vehicle.

(Prior Art) Fig. 3 is a block diagram of a conventional in-vehicle audio device. In Fig. 3, 1.2 are sources A and B that output audio signals, 3 is a source AI,
This is a control circuit that switches the output of source B2, and the output signals of source At and source B2, which are switched by the control of control circuit 3, are amplified by amplifier 5 through volume volume 4, and then output from speakers 6 to
It is designed to output to 9.

Speakers 6 and 7 are for the front R channel (right channel) and L channel (left channel) provided on the front side of the vehicle, and speakers 8 and 9 are for the rear L channel 5 and rear R channel provided on the rear side of the vehicle. This is for channels.

Next, the operation will be explained. For example, if an audio signal from a tape source A1 is being output, and you want to output an audio signal from another source, such as a radio source B2, to a speaker, the control circuit 3 will turn off the power to the source At and turn off the other source. I turned on the B2 and started switching between each source.

Also, since only one source is powered on, only that source signal is output to each channel, and multiple source signals can be output simultaneously to the front and rear sides, L channel, and R channel. I couldn't hear it.

[Problem to be solved by the invention]

Conventional car audio equipment is configured as described above, so while outputting one source signal, other sources must be turned off, and all channels output only one source. It was not possible to output multiple sources to each channel.

This invention was made to solve the above-mentioned problems, and outputs audio signals from each of a plurality of sources to the front and rear channel speakers. The object of the present invention is to obtain an in-vehicle audio device that can drive speakers of each channel.

[Means to solve the problem]

The in-vehicle audio device according to the present invention controls a source channel switching circuit to switch audio signals from a plurality of sources to front and rear channels at the same time by operating a switch. A control circuit is provided to control the output to each of the front and rear speakers.

[For production]

The control circuit in this invention turns on sources other than the currently output source by operating a switch, and also performs switching control 2I of the source channel switching circuit to send two types of source signals to the front side and the rear side. By dividing, audio signals from multiple sources can be output to the front and rear speakers at the same time.

〔Example〕

Embodiments of the in-vehicle audio device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of one embodiment of the same, and numerals 1 to 9 are the same as those of the conventional in-vehicle audio device shown in FIG. is the volume, 53~
5d is an amplifier.

Also, 10 is a double source switch, 11 is a front,
This is a source designation switch that designates the rear side source, and is connected to the control circuit ill3a.

Output signals are sent from ports P, PI of the control circuit 3a to analog switches 12a and 12b, 13a and 13b, respectively.

These analog switches 12a and 12b, 13a and 1
3b constitutes a source channel switching circuit 14 that switches the source signals of source AI and source B2.

The analog switches 12a and 12b each have a source At
, which switches between the L channel signal and the R channel signal of source B2, and analog switch 1
L of source A1 switched by 2a and 12b respectively
The channel signal is output to the rear speaker 8 through the volume polyneme 4a and the amplifier 5a.

Similarly, the R channel signal of source A1 or source B2 selected by analog switches 12a and 12b is output to rear speaker 9 through volume volume 4C and amplifier 5d.

In addition, the analog switches 13a and 13b cause the source A to
1 or when switching the L channel signal of source B2, the signal passes through the volume volume 4b and the amplifier 5b,
The signal is supplied to the speakers 6 on the front side.

In exactly the same way, the analog switch 13a.

13b, when the R channel signal of source AI or source B2 is switched, the volume volume 14
d, the signal is output to the front speaker 7 via an amplifier 5c.

Next, the operation will be explained. With the audio signal of the source Al being output to the speakers 6 to 9 by the switching operations of the analog switches 12a and 13a, the source A1 is output to the front channel speakers 6.7, and the rear channel speakers 8. 9, by pressing the double source switch 10, the control circuit 3a turns on the power to source B2, and multiple source signals of source At and source B2 are output to the source/channel switching circuit 14. is input.

In this source/channel switching circuit 14, the front side source is selected by the control circuit 3a.
By outputting 2-pin data to g, source A
l. The source signal of source B2 is switched by analog switches 13a and 13b.

Similarly, the selection of the rear side source is determined by analog switches 12a and 12b. The four-channel signals of the L channel and R channel of the source A1 and the L channel and R channel of the source B2 outputted from the source channel switching circuit 14 pass through volume volumes 4a to 4d, and are then passed through amplifiers 5a to 5d. It is output to speakers 6-9.

That is, from the analog switch 13a to the L of the source AI
The signal of the channel is applied to the speaker 6 through the volume controller 4b=amplifier 5b, and the R channel signal of the source A1 is applied from the analog switch 13a to the speaker 7 via the volume polynomial 4d=amplifier 5c.

Further, the L channel signal of the source B2 is applied from the switch 12b to the speaker 8 via the volume polyneme 4a-amplifier 5a, and is applied from the analog switch 12b to the speaker 9 via the volume polyneme 4C-amplifier 5d.
added to.

Next, the flowchart shown in FIG. 2 will be explained.

If the double source switch IO is pressed in step S1, a mute signal is output in step S2, and a mute signal is output in step S2.
Proceed to step 3.

In step S3, the control circuit 3a determines whether the current source is outputting source AI or source B2, and if source A1 is being output in step s4, the power source of source B2 is turned on and off. Step S5
If source B2 is being output, turn on source A1.

Next, the control circuit 3a is the source designation switch 11.
is read in step S6, and if the front side indicates source A1 in step S7, the boat Pa,
Output data from Pa and switch to analog switch 12a.
, 12b.

13a and 13b, and in step S8, the mute signal is set to 0FFL, and the respective source signals are output to each of the speakers 6 to 9.

Further, in step S6, the control time W13a
reads the source specification switch 11, and if the front side does not specify source A1, in step S9 data is output from PA and Pm so that the front side becomes source B2 and the rear side becomes source A1. Then, the analog switch 12a.

12b, 13a, and 13b, and in step S8, similarly to the above, the mute signal is set to 0FFL, and the respective source signals are output to the respective speakers 6 to 9.

Each volume control can be achieved using a fader (front/rear output balance adjustment) control.

Further, in addition to the above embodiment, by using such a method, it is also possible to output two or more types of sources separately for the front side and the rear side.

In addition, source Al is added to the front and rear L channels.
and source B to the front and rear L channels.
It is also possible to output two signals.

〔Effect of the invention〕

As described above, according to the present invention, audio signals from multiple sources are switched between front and rear channels by controlling the source channel switching circuit in the control circuit by operating the double source switch and the source designation switch. By switching between each channel, multiple source signals can be output to the front and rear speakers at the same time. This has the effect of allowing multiple sources to be output to each of the front and rear channel speakers. There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an in-vehicle audio device according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation flow of the same embodiment, and FIG. 3 is a block diagram of a conventional in-vehicle audio device. DESCRIPTION OF SYMBOLS 1... Source A, 2... Source B, 3a... Control circuit, 6-9... Speaker, 10... Double source switch, 11... Source specification switch,
12a, 12b, 13a, 13b - analog switch,
14... Source channel switching circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] a plurality of sources that output audio signals, a plurality of speakers respectively disposed on the front side and a rear side of the vehicle, and a double source switch that is operated when outputting the audio signals from the plurality of sources; a source designation switch; a source channel switching circuit that selects the audio signals from the plurality of sources and supplies them to the plurality of speakers; An in-vehicle audio device comprising: a control circuit that supplies power and controls switching of the source channel switching circuit to cause the front and rear speakers to individually output the audio signal from the source.