JP3607674B2 - Automotive audio interface adapter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle audio interface adapter (hereinafter simply referred to as an adapter) that is mounted when a genuine head unit is replaced with a commercially available non-genuine head unit in an in-vehicle audio system with genuine navigation (hereinafter simply referred to as NAVI). It is about.
[0002]
[Prior art and its problems]
As shown in FIG. 1, an audio system with a NAVI system is connected to a genuine head unit 1, a NAVI system 2, a display 3, and a television (hereinafter simply referred to as TV) tuner 4 via a connector 7 via a LAN cable. LAN communication is performed. The speakers 5-1 to 5-4 are directly connected to a genuine head unit via the connector 6. In such a configuration, when this genuine head unit is replaced and a commercially available non-genuine head unit that does not have the communication function provided with the genuine head unit is mounted, the sound is output normally, but the connection in the LAN form As a result, the NAVI system 2, the display 3, and the TV tuner 4 cannot operate normally, and the screen of the display 3 remains blacked out.
[0003]
For this reason, an adapter that is attached when the genuine head unit is replaced with a non-genuine head unit needs a function that substitutes for the communication of the genuine head unit 1. Also, the audio output of the NAVI system 2 and the TV tuner 4 is directly connected to the head unit 1 at the AUX level, and is appropriately switched or imposed depending on the operation mode and output from the speaker 5, but is usually not genuine. Since there is no such input in the head unit, these sounds will not be output if the head unit is replaced.
[0004]
In addition, when the audio output of the TV tuner 4 is to be output to the outside by an amplifier and a speaker, the input specifications of these amplifiers are usually unbalanced, but the output of the TV tuner 4 is balanced, Cannot be directly connected. Furthermore, since the audio output of the TV tuner 4 remains output even when the television is not normally viewed, when outputting with a device other than the genuine head unit, the television tuner 4 can be There is a problem that the sound must be muted on the playback equipment.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and an object thereof is to provide an adapter to be mounted when a genuine head unit is replaced with a commercially available non-genuine head unit.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the adapter described in claim 1 is a genuine adapter comprising a genuine head unit, a navigation system, a display, and a TV tuner connected with a microcomputer. In a vehicle-mounted audio system, a LAN signal of a specific address that is mounted when the genuine head unit is replaced with a non-genuine head unit and is monitored when the genuine head unit is mounted And a LAN signal generation means for transmitting the LAN signal in place of the head unit so as to function without obstructing the operation of the other genuine device.
[0007]
The adapter described in claim 2 includes a mixing circuit, amplifier, and speaker for synthesizing and outputting one channel of the TV tuner and the guidance sound of the NAVI system in the configuration according to claim 1. It is characterized by.
[0008]
The adapter according to claim 3 converts the sound output (balanced output) of the TV tuner into an unbalanced output so that it can be connected to a general amplifier in the configuration according to claim 2, and improves anti-noise performance. Therefore, a transformer is arranged in the middle of the audio circuit.
[0009]
According to a fourth aspect of the present invention, in the configuration of the second aspect, the adapter includes a mute circuit for muting the audio output of the TV tuner output from the built-in speaker when the head unit is used. To do.
[0010]
According to a fifth aspect of the present invention, in the configuration of the fourth aspect, the remote terminal for external device control of the replaced non-genuine head unit is used for controlling the mute circuit.
[0011]
[Action and effect of the invention]
The adapter according to claim 1 is mounted when replacing a genuine head unit with a commercially available non-genuine head unit in an in-vehicle audio system with a genuine NAVI system, and the genuine head unit is mounted. The LAN signal is generated by a LAN signal generating means for generating a LAN signal of a specific address obtained by monitoring at times, and the LAN signal is made to function without impeding the operation of other genuine devices. Accordingly, the genuine head unit can be removed and replaced.
[0012]
The adapter according to claim 2 incorporates a mixing circuit, an amplifier, and a speaker so that the guidance sound of the NAVI system and the sound of the TV tuner can be output without the genuine head unit. Even if it is removed, the audio output of the NAVI system and the audio of the TV tuner can be output.
[0013]
Since the adapter according to claim 3 converts the audio output (balanced output) of the TV tuner into an unbalanced output so that it can be connected to a general amplifier, a transformer is arranged in the middle of the audio circuit in order to improve anti-noise performance. The sound output of the TV tuner can be converted to unbalance and connected to a general amplifier.
[0014]
The adapter according to claim 4 is provided with a mute circuit for muting the sound output of the TV tuner output from the built-in speaker when the head unit is used. The sound can be muted.
[0015]
Since the adapter according to claim 5 uses the remote terminal for external device control of the non-genuine head unit replaced for the control of the mute circuit, when the power of the replaced non-genuine head unit is turned on, the signal is used. The sound of the TV tuner output from the speaker built in the adapter can be muted.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG. 2 is a circuit diagram showing a schematic configuration of the adapter A, and the outside of the two-dot chain line is a device not included in the configuration of the adapter A. In FIG. 2, 8 is a commercially available non-genuine head unit, 9 is a giboshi terminal which is the speaker output, and 10 is a connector which receives the giboshi terminal and can be directly connected to the connector 6. Reference numeral 11 denotes a connector that can be directly connected to the LAN cable connector 7, and the voice and LAN signal of the genuine TV tuner (hereinafter simply referred to as TV tuner) 4 pass through this connector 11.
[0017]
Also, 12 is a transformer that receives guidance sound of a genuine NAVI system (hereinafter simply referred to as NAVI system) 2, 13 is a resistor, 14 is a transformer that receives L channel sound of the TV tuner 4, and 15 is R channel sound of the TV tuner 4. The receiving transformers 16 and 17 are resistors. Reference numeral 18 denotes an audio power amplifier built into the adapter A, and 19 denotes a speaker built into the adapter A.
[0018]
Reference numeral 20 denotes a remote terminal for receiving an external control signal, which is normally connected to an external device control remote signal for the non-genuine head unit 8. 21 is a resistor, 22 is an FET transistor for muting the sound of the TV tuner 4, 23 is a pin terminal for connecting the L channel sound of the TV tuner 4 to an external amplifier, and 24 is the R channel sound of the TV tuner 4. Pin terminal for connection to external amplifier. Reference numeral 25 denotes a microcomputer (hereinafter referred to as a microcomputer) circuit that generates a LAN signal, and 26 denotes an interface for adapting the LAN signal to the in-vehicle LAN specification.
[0019]
The microcomputer circuit 25 of the adapter A having the above configuration is usually composed of a microcomputer (hereinafter simply referred to as a microcomputer) or a circuit block mainly composed of a microcomputer, and stores and holds LAN signal transmission / reception data in the form of a program or data. Accordingly, the genuine head unit 1 has a function of generating a LAN signal.
[0020]
Therefore, as shown in FIG. 3, the LAN signal monitor device 30 is connected to the LAN cable of the in-vehicle audio system with the genuine NAVI system with the genuine head unit 1 attached, and the LAN cable is used at the time of key-on and various operations. Monitor and collect data flowing through Then, only the data having the specific address (address 100h in this case) of the genuine head unit 1 as the transmission source or the reception destination is extracted. The extracted transmission / reception data is a LAN signal related to the genuine head unit 1.
[0021]
In addition, there is a certain combination of the extracted transmission / reception data. For example, there is a combination such as transmitting a specific data pattern for certain received data. When such a data analysis is performed and the genuine head unit 1 is replaced with the non-genuine head unit 8, data that the adapter A of the non-genuine head unit 8 may receive instead of the genuine head unit 1 The data to be transmitted is determined and stored in the microcomputer circuit 25 in the form of a program or data as described above, and a genuine head unit LAN signal is generated as necessary.
[0022]
In the in-vehicle audio system with a genuine NAVI system equipped with the adapter A having the above configuration, the audio output of the non-genuine head unit 8 on the market is directly connected to the speaker 5 via the giboshi terminal 9 and the connectors 10 and 6. The sound is output from the speaker 5 without any problem. On the other hand, the guidance voice of the NAVI system 2 input via the connector 10 and the L channel voice of the TV tuner 4 input via the connector 11 are input to the transformer 12 and the transformer 14 respectively. The secondary output is mixed with the resistor 13 and the resistors 16 and 17 by appropriately adjusting the volume ratio, then input to the power amplifier 18 and output from the speaker 19. The transformer 12, the transformer 14, the resistor 13, and the resistors 16 and 17 constitute a mixing circuit MX.
[0023]
At this time, when listening to the built-in source (FM tuner, CD, etc.) of the non-genuine head unit 8, the power of the non-genuine head unit 8 is turned on, the remote signal becomes 12 V, and the input to the remote terminal 20 The remote signal turns on the FET transistor 22 through the resistor 21 and mutes the L channel sound of the TV tuner 4. The resistor 21 and the FET transistor 22 constitute a mute circuit M.
[0024]
Note that the audio of the L and R channels of the TV tuner 4 is output to the pin terminals 23 and 24 after the secondary side output is converted to unbalance via the transformers 14 and 15, respectively. By connecting an external amplifier or speaker to this terminal, the sound of the TV tuner 4 can be heard with a louder sound. Of course, if the non-genuine head unit 8 has an AUX input, it can be connected to it.
[0025]
The LAN signal is generated by the microcomputer circuit 25, converted into a signal form conforming to the in-vehicle LAN specification by the interface 26, and then connected to the in-vehicle LAN cable via the connectors 11 and 7.
[0026]
As described above, the adapter A according to the present invention is a specific information obtained by collecting with the LAN signal monitoring device 30 when the genuine head unit 1 is mounted in an in-vehicle audio system with a genuine NAVI system. Since the microcomputer circuit 25 that generates the address LAN signal transmits a LAN signal at a specific address instead of the genuine head unit 1 and functions without obstructing the operation of other genuine devices such as the NAVI system 2, the genuine head The unit 1 can be removed and replaced.
[0027]
Moreover, since the mixing circuit, the amplifier 18 and the speaker 19 are built in so that the guidance voice of the NAVI system 2 and the voice of the TV tuner 4 can be output without the genuine head unit 1, the genuine head unit 1 can be removed. The audio output of the NAVI system 2 and the audio of the TV tuner 4 can be output.
[0028]
Furthermore, since the audio output (balanced output) of the TV tuner 4 is converted to an unbalanced output so that it can be connected to a general amplifier, and the transformers 14 and 15 are arranged in the middle of the audio circuit in order to improve the anti-noise performance, the TV tuner Can output 4 voices. [0029]
Since the mute circuit for muting the audio output of the TV tuner 4 output from the speaker 19 when the non-genuine head unit 8 is used is provided, when the TV is not viewed, the speaker 19 built in the adapter A is connected to the TV. Since the remote terminal 20 for controlling the external device of the commercial non-genuine head unit 8 replaced with the mute circuit can be used while the sound can be silenced, when the power of the replaced non-genuine head unit 8 is switched on The sound of the TV tuner 4 output from the speaker 19 built in the adapter A can be silenced using the signal.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of a genuine in-vehicle audio system.
FIG. 2 is a schematic block diagram of an adapter connected to a non-genuine head unit.
FIG. 3 is a schematic block diagram showing a mode of monitoring LAN signals of an audio system with a genuine NAVI system.
[Explanation of symbols]
A. . . Adapter 1. . . Genuine head unit2. . . NAVI system4. . . TV tuners 5-1 to 5-4. . . Speaker 8. . . Non-genuine head unit 12, 14, 15. . . Transformers 13, 16, 17, 21. . . Resistor 18. . . Power amplifier 19. . . Built-in speaker 20. . . Remote terminal 22. . . FET transistors 23, 24. . . Pin terminal 25. . . Microcomputer circuit 26. . . Interface 30. . . LAN signal monitoring device MX. . . Mixing circuit . . Mute circuit

Claims (5)

In a genuine in-vehicle audio system configured by connecting a genuine head unit equipped with a microcomputer, a navigation system, a display, and a TV tuner with a LAN cable, the genuine head unit is replaced with a non-genuine head unit. It is to be worn when replacing,
LAN signal generating means for generating a LAN signal of a specific address obtained by monitoring when the genuine head unit is mounted, transmitting the LAN signal instead of the head unit, and the other genuine device In-vehicle audio interface adapter, which functions without disturbing the operation of The in-vehicle audio interface adapter according to claim 1, further comprising a mixing circuit, an amplifier, and a speaker for synthesizing and outputting one audio channel of the TV tuner and guidance audio of the navigation system. 3. The audio output (balanced output) of the TV tuner is converted into an unbalanced output so that it can be connected to a general amplifier, and a transformer is disposed in the middle of the audio circuit in order to improve noise performance. The in-vehicle audio interface adapter described. The in-vehicle audio interface adapter according to claim 2, further comprising a mute circuit for muting the audio output of the TV tuner output from the built-in speaker when the head unit is used. The in-vehicle audio interface adapter according to claim 4, wherein a remote terminal for external device control of the replaced non-genuine head unit is used for controlling the mute circuit.

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