JPH04103736U - FM modulator - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to an FM modulator.
It is an object of the present invention to easily reproduce the sound of a large number of audio sources using an M modulator, and also to enable simple communication using a microphone. [Structure] According to the switching of the selection switch SW1, one of the microphone input and a plurality of input audio signals is selected and converted into an FM signal by the FM modulator circuit 14, and the FM signal is selected according to the switching of the selection switch circuit 15.
The M signal is outputted to the in-vehicle antenna 20 side or to the FM radio 21 side.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an FM modulator, particularly an FM modulator suitable for in-vehicle sound systems, etc. Regarding the generator.

0002

[Conventional technology]

FM modulators are used to improve system functionality in in-vehicle sound systems. data is used. This FM modulator converts the input signal into an FM signal and outputs it. For example, if a vehicle is pre-equipped with an FM radio, a CD player can be added later. When adding an FM player, as shown in Figure 3, the audio output terminal of CD player 1 Connect the input terminal of modulator 2, and connect the output terminal of FM modulator 2 to the FM radio. Connect it to the antenna terminal of O3. Audio output from CD player 1 The signal is first converted to an FM signal by FM modulator 2, and then sent to the antenna of FM radio 3. output to the terminal.

0003 Therefore, the tuning frequency of the FM radio 3 is set to the FM output from the FM modulator 2. If you tune to the signal, the FM signal will be demodulated to the original audio signal, and the FM radio After being amplified by the internal amplifier, the sound is output from the vehicle-mounted speaker 4. This results in , audio equipment can be easily added to a vehicle equipped with an FM radio.

0004 In addition, as shown in FIG. 4, a microphone 5 is connected to the input terminal of the FM modulator 2, Connect the in-vehicle antenna 6 to the output terminal and broadcast the microphone input with radio waves to connect the in-vehicle antenna of other cars. By receiving it with the antenna 7 and FM radio 8 and outputting the audio from the car speaker 9, It was also used as a simple transceiver (transmitter).

[0005] However, since conventional FM modulators have a single function, they can be used in addition to CD players. , DAT, TV tuner, etc., when installing multiple audio source devices such as Purchasing multiple M modulators 2 would be too expensive, so purchasing one FM modulator I was trying to change the connection to the controller, but I had to change the connection while driving. It was extremely inconvenient.

[0006]

[Problem that the idea aims to solve]

From the above, the purpose of the present invention is to provide multiple audio sources with one FM modulator. The F An object of the present invention is to provide an M modulator.

[0007]

[Means to solve the problem]

In one aspect of the present invention, a microphone input and one input audio signal from among a plurality of input audio signals are provided. A selection switch that selects one of the signals, and an FM mode that converts the output of the selection switch to an FM signal. The output side of the modulator circuit, the FM modulator circuit, the antenna side, and the FM radio. This is achieved by means of a changeover switch circuit which makes a predetermined switching connection between the input sides.

[0008] In another aspect of the present invention, one of a plurality of input audio signals is A selection switch to select, a mixer to mix the output of the selection switch and the microphone input, and , an FM modulator circuit that converts the mixer output into an FM signal, and an FM modulator Make the specified switching connections between the output side of the circuit, the antenna side, and the input side of the FM radio side. This is achieved by a changeover switch circuit.

[0009]

[Effect]

According to one aspect of the present invention, a microphone input and multiple inputs can be selected according to switching of a selection switch. Select one of the input audio signals, convert it to an FM signal, and switch Depending on the switching of the switch circuit, the FM signal can be output to the antenna side, or the FM radio output to the side. This allows one FM modulator to switch Easily select any one of multiple input audio signals by switching as appropriate. You can play sound, send it to the outside, and perform simple communication using a microphone. .

0010 According to another aspect of the present invention, multiple input options can be selected according to switching of a selection switch. - Select one of the audio signals, mix it with the microphone input, and then convert it to an FM signal At the same time, the FM signal is output to the antenna side according to the switching of the changeover switch circuit. or output to the FM radio side. This allows one FM modulator allows you to easily connect multiple input audio signals by simply flipping a switch. Play any one of them, or play a sound mixed with the microphone input. It can also be used for simple communication using a microphone or for simple communication. This makes it possible to add background music.

[0011]

【Example】

Figure 1 shows an in-vehicle sound system equipped with an FM modulator according to an embodiment of the present invention. FIG.

0012 In the figure, 10 is a CD changer, 11 is a DAT, and 12 is a TV tuner. It is a radio source device and is connected to an FM modulator unit. 13 is F It is an M modulator unit that receives input from each audio source device and will be described later. Select one of the microphone inputs according to the switch, and select FM. In addition to converting it into a signal, it also connects the vehicle antenna and FM radio according to the switching of the switch. Output to one or both of the This FM modulator unit is It also has the ability to connect an in-vehicle antenna to an FM radio.

[0013] SW1 is the input source from CD changer, DAT, TV tuner, and microphone. A selection switch 14 selects an FM signal of a predetermined frequency from the output of the selection switch. 15 is the output side of the FM modulator circuit, A switching switch that makes a specified switching connection between the mounted antenna and the input side of the FM radio. SW2 disconnects the output side of the FM modulator circuit and the vehicle antenna. The next switch, SW3, connects the FM radio input to the car antenna and FM modulator. This is a switch that switches between the output side of the circuit and the output side of the circuit. 16 is a controller to be described later. Input operation commands for the FM modulator from the selector switch and changeover switch circuit. You can control the switches for the CD changer, input operation commands for the CD changer, and change the CD changer. This is a control unit that outputs data to the computer.

[0014] 17 is a controller with a microphone, 18 is an operation unit, DAT, TV tuner , microphone, and FM radio, and switch SW2. on/off control operations, SW3 switching control operations, and CD changer control operations. An operation section 19 is a microphone for performing performance operations and the like. The controller 17 is an operation section. in response to source selection operations, switch control operations, and performance operations on the CD changer. Output operation commands to the FM modulator, or input microphone input to the FM modulator. Output to knitwear.

[0015] 20 is an in-vehicle antenna connected to the FM modulator unit, which receives the FM signal. Receive and send. 21 is an FM radio, which is an FM radio received by the car antenna. Demodulates and amplifies the signal, and demodulates and amplifies the output of the FM modulator unit. Ru. 22 is an in-vehicle speaker that converts the output of the FM radio into sound.

[0016] Next, the operation of the above embodiment will be explained. When listening to FM radio broadcasts, use the operation section 18 of the controller 17 to When the base selection operation is performed, the corresponding operation command is sent from the controller 17 to the FM module. is sent to the data unit 13, and SW2 is turned off and S W3 is switched to the a side. As a result, the in-vehicle antenna 20 becomes the FM radio 21. Since it is connected, if you perform a tuning operation on FM radio 21, the desired FM radio station will be displayed. You can listen to the broadcast.

[0017] When listening to the CD changer 10 in your car, use the operation unit 18 to select the CD changer source. When you perform the selection operation, the off control operation of SW2, and the b side switching control operation of SW3, the The corresponding operation commands are sent from the controller 17 to the FM modulator unit 13. Under the switch control of the control unit 16, SW1 is set to the a side, SW2 is turned off, and SW3 is set to the b side. Can be switched to the side. In this state, use the operating section 18 to perform performance operations on the CD changer. When the operation is performed, the corresponding operation command is sent from the controller 17 to the FM modulator unit. 13, is output to the CD changer 10 via the control unit 16, and is output to the CD changer 10. Enja 10's performance begins.

[0018] The audio signal played by the CD changer 10 is sent to the FM modulator unit. 13, and is converted into an FM signal by the FM modulator circuit 14 via SW1. It will be done. Then, the RF is input to the antenna terminal of the FM radio 21 via SW3. . The tuning frequency of the FM radio 21 is tuned to the output of the FM modulator circuit 14. If you do, the audio signal played by the CD changer 10 will be demodulated and amplified. , is output from the speaker.

[0019] When listening to DAT11 (or TV tuner 12) in your car, use the operation unit 18 to T (or TV tuner) source selection operation, SW2 off control operation, SW3 When the b-side switching control operation is performed, the FM modulator unit 13 SW1 is switched to the b side (or c side), SW2 is turned off, and SW 3 is switched to the b side, so the signal from DAT11 (or TV tuner 12) Audio signals can be played back through speakers.

[0020] For example, when listening to the performance of DAT11 in your own car and another car, press DAT11 on the operation unit 18. Selection operation of AT11, ON control operation of SW2, switching to a side or b side of SW3 When a control operation is performed, SW1 switches to the b side, SW2 turns on, and SW3 switches to the a or b side. In addition to being able to listen to DAT performances in your own car, you can also listen to DAT11 audio. Since the FM signal converted from the audio signal is transmitted to the outside from the on-vehicle antenna 20, other If you tune your FM radio to the specified frequency in your car, you can listen to the same DAT performance. .

[0021] When you want to communicate with another vehicle using a microphone, use the operation unit 18 to select the microphone source. When you perform the control operation by turning on SW2 and switching SW3 to the c side, the controller 17, each corresponding operation command is input to the FM modulator unit 13, and the control The section 16 sets SW1 to the d side, SW2 to the on side, and SW3 to the c side. in this state , when you speak into the microphone 19, the microphone output is sent from the controller 17 to the FM module. sent to the modulator unit 13 and input to the FM modulator circuit 14 via SW1 and converted into an FM signal. Then, it is transmitted from the on-vehicle antenna 20 via SW2. be believed. As a result, if the other car's FM radio is tuned to the specified frequency, can be received. When listening to communications from another vehicle, press SW2 on the operation unit 18. When switching control operation is performed to set SW3 to the a side (FM radio broadcast source (same as selection), SW2 is turned off and SW3 is turned to the a side under the control of the control unit 16 as described above. Can be switched. Therefore, the conversation transmitted from another vehicle can be heard through the speaker.

[0022] In addition, a press talk switch is provided on the operation unit, etc., and the press talk switch is turned on. When this happens, SW2 is turned on, SW3 is switched to the c side, and the press talk switch is turned on. When the switch is turned off, SW2 is turned off and SW3 is switched to the a side or the b side. This will make communication operations easier.

[0023] FIG. 2 is a block diagram showing a modification of the embodiment described above, and in the example of FIG. Make the input equal to the audio signal from a CD changer, DAT, TV tuner, etc. In contrast to the input source, in Figure 2 the audio from a CD changer etc. The microphone input is mixed into the signal.

[0024] SW1' of the FM modulator unit 13A is the CD changer 10, DAT 11. One of the TV tuners 12 is selected by the source selection control of the control unit 16A. Choose. 23 is a mixer, which mixes the output of SW1' and the microphone input and outputs the FM module. output to the controller circuit 14. The control unit 16A receives input from the controller 17A. The audio source side for the mixer based on the mixing level adjustment operation command. and independent mixing level control on the microphone side. FM radio on operation section 18A. Broadcasting, CD changer, DAT, TV tuner source selection operation, microphone on ・Off operation, switch switching control operation, mixing level adjustment operation, CD check It is now possible to control the performance of the Nja. Other components are exactly the same as in Figure 1. It is structured like this.

[0025] Next, to explain the operation in Figure 2, for example, when listening to DAT11 only in your own car, the operation When the DAT source is selected in the section 18A, the corresponding operation is performed from the controller 17A. The command is output, and the control unit 16A turns SW1' to b side, turns off SW2, and turns SW3 to b side. shall be. As a result, the DAT performance can be heard through the speaker 22. At this time, the operation section If you turn off the microphone at 18A, the microphone input will be the FM modulator unit. There is no output to the 13A side, and conversations inside the car will not be output from the speaker. stomach.

[0026] Conversely, when the microphone is turned on using the operation unit 18A, the microphone input is switched to the controller 1. 7A to the mixer 23 of the FM modulator unit 13A. Okay So, the voice spoken into microphone 19 was mixed with the audio signal from DAT 11. Then, it is converted to an FM signal and output to the FM radio 21, so it is output from the speaker 22. The sound is a combination of music and voice, which can be enjoyed as karaoke. Ru. At this time, when a level adjustment operation is performed on the operation section 18A, the corresponding operation command is The controller 16A inputs the input from the troller 17A to the controller 16A, and the controller 16A sends the input to the mixer 23. Since level adjustment control is performed, each level of music and vocals can be arbitrarily set to desired values. Can be determined.

[0027] Similarly, select the CD changer or TV tuner as the source using the operation section 18A. If you do so, you can enjoy CD changer performance, TV audio, and FM radio broadcasts. If selected, it is also possible to listen to FM radio broadcasts in the same manner as in the case of FIG.

[0028] In addition, a control operation is performed to turn on SW2 with the operation unit 18A, and the control unit 16A By turning on SW2, you can play audio sources such as DAT not only to your own car but also to other cars. You can listen to musical performances or karaoke.

[0029] When you want to communicate with another vehicle using the microphone, use the operation section 18A to turn on the microphone. While the microphone input is output to the FM modulator unit 13A, the audio source Mix the audio signal from SW1' by adjusting the level to the lowest level. Set the kissing level to the lowest level. Then, turn on SW2 and switch SW3 to c side. When a control operation is performed, the control unit 16A turns on SW2 and switches SW3 to the c side. . In this state, if you speak into microphone 19, only the microphone input will be FM modulated. The signal is input to the data circuit 14 and converted into an FM signal. Then, via SW2, It is transmitted from the antenna 20. As a result, the other vehicle tunes the FM radio to the specified frequency. If you tune it, you can receive it.

[0030] To play background music while communicating with another vehicle, use the operating section 18A. If you increase the level on the audio source side by adjusting the level in A corresponding operation command is input from the controller 17A to the controller 16A, and the controller 16 A causes the mixer 23 to increase the mixing level on the audio source side. Yo For example, if you have selected the DAT11 source in advance, you can hear the conversation that other cars can hear. DAT performance can be played as background music.

[0031] When listening to communications from another vehicle, turn off SW2 on the operation panel 18A, and switch SW3 to side a. When an operation for switching control is performed, a corresponding operation command is input to the control unit 16A. , this control section 16A turns off SW2 and switches SW3 to side a, so that the in-vehicle A signal received by antenna 20 is input to FM radio 22. Therefore, FM radio 2 If you match the tuning frequency of 1 to the transmission frequency of the other vehicle, you will not be able to listen to communications from other vehicles. I can do that. In addition, a press talk switch is installed on the operation section, etc., and the press talk switch When the switch is turned on, the control unit turns on SW2 and switches SW3 to the c side. , when the press talk switch is turned off, SW2 is off and SW3 is on side a or b. If it is possible to switch between the two sides, communication operations will become easier.

[0032]

[Effect of the idea]

According to one aspect of the present invention, from among the microphone input and a plurality of input audio signals, A selection switch that selects one, and an FM that converts the output of the selection switch into an FM signal. Modulator circuit, output side of FM modulator circuit, antenna side, FM radio A selector switch circuit is provided to make a predetermined switching connection between the input sides of the Select one of the microphone input and multiple input audio signals according to the switch and converts it to an FM signal, and also converts it into an FM signal according to the switching of the changeover switch circuit. It is configured to output the M signal to the antenna side or to the FM radio side. Therefore, with one FM modulator, you can easily operate by simply flipping the switch as appropriate. Simply play any one of multiple input audio signals or send it to an external source. You can send messages and perform simple communication using a microphone.

[0033] According to another aspect of the present invention, one of a plurality of input audio signals is selected. a mixer that mixes the output of the selection switch and the microphone input; FM modulator circuit that converts mixer output to FM signal and FM modulator circuit Make the specified switching connections between the output side of the radio, the antenna side, and the input side of the FM radio side. A selector switch circuit is provided, and multiple input audio can be selected according to the switching of the selection switch. Select one of the audio signals, mix it with the microphone input, and then convert it to an FM signal. In both cases, the FM signal is output to the antenna side according to the switching of the changeover switch circuit. Since it is configured to output to the FM radio side, one FM module Easily connect multiple audio inputs by simply flipping a switch as appropriate. You can play back any one of the signals or mix it with the microphone input. It can also be used for simple communication using a microphone or for simple communication using a microphone. It is now possible to add background music.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an in-vehicle audio system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a modification of FIG. 1;

FIG. 3 is a block diagram showing an example of how a conventional FM modulator is used.

FIG. 4 is a block diagram showing another example of how a conventional FM modulator is used.

[Explanation of symbols]

10 CD changer 11 DAT 12 TV tuner 13, 13A FM modulator unit 14 FM modulator circuit 15 Changeover switch circuit 17, 17A controller 19 Mike 21 FM radio SW1, SW1' selection switch

Claims (2)

[Scope of utility model registration request] 1. A selection switch that selects one of a microphone input and a plurality of input audio signals, and an FM modulator circuit that converts the output of the selection switch into an FM signal.
An FM modulator comprising: a changeover switch circuit that performs predetermined switching connections between the output side of the FM modulator circuit, the antenna side, and the input side of the FM radio side. 2. A selection switch that selects one of a plurality of input audio signals, a mixer that mixes the output of the selection switch and a microphone input, an FM modulator circuit that converts the mixer output into an FM signal, and an FM modulator. An FM modulator comprising: a changeover switch circuit that performs a predetermined switching connection between an output side of the circuit, an antenna side, and an input side of an FM radio side.