JP3224495B2 - Automotive electronics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a vehicle and uses a microcomputer or a digital signal processor (hereinafter referred to as a DSP) to perform, for example, a characteristic specification such as an audio / video signal processing and an operation / display processing. The present invention relates to an in-vehicle electronic device that controls

[0002]

2. Description of the Related Art FIG. 28 is a block diagram showing an overall configuration of a vehicle-mounted acoustic device having a reproduction sound quality sound field adjusting function using a DSP as an example of a conventional vehicle-mounted electronic device.・ Disc (hereinafter referred to as CD) player, cassette tape player, radio receiver, digital audio tape recorder (hereinafter referred to as “CD”)
DAT) is used as an audio signal source. In the figure, reference numeral 13 denotes a control means constituted by a microcomputer, and 13b denotes this control means 1
3 (hereinafter referred to as RO)
Reference numeral 14 denotes a key input switch for performing key input to the control means 13. Reference numeral 21 denotes an analog-to-digital conversion circuit (hereinafter referred to as an AD converter) for converting an audio signal input from the above-described audio signal source from an analog signal to a digital signal, and 22 denotes a DSP for processing the digital audio signal. 2
2a is a sound quality adjustment circuit of the DSP 22, and 22b is a DSP
22 is a sound field adjustment circuit. Reference numeral 23 denotes a digital-to-analog conversion circuit (hereinafter, referred to as a DA converter) for converting the output of the DSP 22 from a digital signal to an analog signal, reference numeral 24 denotes a volume circuit for adjusting the volume, and reference numeral 25 denotes a mute circuit for suppressing sound output. . 26 is a channel divider circuit which divides each of the front left and front right audio signals passed through the mute circuit 25 into two channels, 27 is a power amplifier circuit which amplifies the power of each audio signal, and 28 is this power amplifier circuit A speaker that outputs sound based on the audio signal amplified by 27.

FIG. 29 shows a sound quality adjustment circuit 22 in the DSP 22.
It is a block diagram which shows the specific example of a. In the figure, 31
Numeral 32 denotes an input level adjusting circuit for adjusting the input level of the digital audio signal input from the AD converter 21. Numeral 32 designates an output from the input level adjusting circuit 31 by a plurality of second-order infinite-length impulse response types This is a second-order IIR digital filter cascade circuit that performs filtering with a digital filter (hereinafter, referred to as a second-order IIR digital filter). Reference numeral 33 denotes a reverberation sound generating circuit for generating a reverberation sound based on the signal output from the input level adjustment circuit 31, and reference numeral 34 denotes a secondary IIR type digital filter cascade circuit 32 and the reverberation sound generation circuit 3
3 is an output level adjusting circuit for adjusting the output level.

FIG. 30 is a block diagram showing a specific example of a sound field adjustment circuit 22b in the DSP 22. In the figure, reference numeral 40 denotes a line on which a digital audio signal from the sound quality adjustment circuit 22a is directly transmitted as sound;
Is a delay circuit for delaying the reflected sound component, 41b is a delay circuit for delaying the indirect sound component, and 41c is a delay circuit for delaying the reverberant sound component. 42 is the line 40
And a product-sum circuit for calculating the product sum of the components from the delay circuits 41a to 41c; 42a, an integrating circuit (level adjusting circuit) for determining the mixing ratio of each component; and 42b, an adding circuit for combining them. 43 is a delay circuit for delaying the output of the product-sum circuit 42, and 44 is an output level adjusting circuit for adjusting the output level of the delay circuit 43.

The sound quality adjustment circuit 22a and the sound field adjustment circuit 22b are digital signal processing circuits whose algorithms are formed by a program of the DSP 22, and the control means 1 which receives a key input from the key input switch 14.
By setting the coefficient by 3, it is possible to set a frequency characteristic and a sound field characteristic in which a reflected sound component, a reverberant sound component, and an indirect sound component are synthesized.

Next, the operation will be described. A two-channel analog audio signal from an audio signal source such as a CD player, a cassette tape player, a radio receiver, and a DAT player is converted into a digital audio signal by the AD converter 21 and input to the DSP 22. The DSP 22 adjusts the sound quality of the two-channel digital audio signal by the sound quality adjustment circuit 22a, and adjusts the sound field by the sound field adjustment circuit 22b. That is, the sound quality adjustment circuit 22a converts the input two-channel digital audio signal into the front left, rear left, rear woofer, reverberation, front right,
The signal is divided into six signals on the rear right, and a secondary IIR type digital filter cascade circuit 32 or a reverberation sound generation circuit 3
3 and adjusts the sound quality. The sound field adjustment circuit 22b uses delay circuits 41a to 41c and a product-sum circuit 42 to adjust the sound quality.
Sound field adjustment of the two signals, front left, rear left, rear woofer,
It outputs five signals, rear right and front right.

Here, the sound quality adjustment circuit 22 in the DSP 22
The sound quality adjustment performed by the sound field adjustment circuit 22b and the sound field adjustment performed by the sound field adjustment circuit 22b are performed by the user through the plurality of key input switches 14 provided on the panel surface of the on-vehicle audio device. Is performed according to the various parameters. The parameters to be set include the type of filter of each equalizer provided in each reproduction channel, the center frequency, the quality factor, the gain, and the like as those relating to the sound quality characteristics. Number, level, delay time, level of reverberant sound component, attenuation rate, delay time, level of indirect sound component,
There is a delay time. In addition, these parameters are set so that the sound quality and sound field characteristics suitable for the vehicle can be obtained because the vehicle interior shape, the interior material, the speaker characteristics, the arrangement, and the like differ depending on the type of the vehicle on which the on-vehicle acoustic device is mounted. There is a need to.

[0008] The sound quality and the sound field are adjusted and the DSP
The five digital signals output from 22 are respectively converted into analog signals by a DA converter 23, the volume is adjusted by a volume circuit 24, and sent to a mute circuit 25. The signal that has passed through the mute circuit 25 is sent directly or via a channel divider circuit 26 to a power amplifier circuit 27, where the signal is amplified and sounds corresponding speakers 28 disposed at various places in the vehicle.

Documents describing the technology related to such a conventional on-vehicle electronic device include, for example, Japanese Utility Model Laid-Open No. 2-112100 and Japanese Utility Model Application Laid-Open No. 61-145051.
And Japanese Utility Model Laid-Open Publication No. 4-61995.

[0010]

Since the conventional on-vehicle electronic device is configured as described above, there are the following problems. That is, in an in-vehicle acoustic device, it is necessary to set parameters so that sound quality and sound field characteristics suitable for a vehicle in which the device is mounted can be obtained. Because the indoor environment characteristics such as the layout are different, the setting of the above parameters required the user to have specialized knowledge and experience in order to obtain the characteristics suitable for the vehicle, which was very troublesome. .

For this reason, there has been devised such that each parameter is stored in a preset form corresponding to several kinds of characteristics, and the parameters are selectively read out by a switch operation or the like to set characteristic specifications. ing.
However, even in this case, it is difficult for the user to determine what kind of indoor environment characteristics the vehicle has and select a parameter corresponding to the indoor environment characteristic.

Further, a microphone is installed in the vehicle interior, a measurement sound is generated from the on-vehicle acoustic device, the sound is collected by the microphone, and the relationship between the generated signal and the collected signal is analyzed by a computer inside the on-vehicle audio device. In addition, there has been proposed a configuration in which appropriate parameters are extracted and set. In this case, a certain degree of relationship between the indoor environment characteristics and the reproduced sound quality characteristics corresponding thereto can be obtained.
Depending on the cost of systems such as sound collection and acoustic analysis, considerable costs must be expected in order to achieve satisfactory results.

Further, by designing a dedicated on-vehicle acoustic device in accordance with the reproduced sound quality sound field characteristics of each vehicle type, it is possible to provide reproduced sound quality sound field characteristics suited to the indoor environment characteristics of each vehicle. However, in this case, the number of models to be designed for each type of vehicle increases, so that an increase in design and production costs is inevitable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and there is provided an on-vehicle electronic device which can automatically adapt to a predetermined characteristic specification adapted to the type of vehicle attached by simply attaching the vehicle to the vehicle. It is intended to provide.

[0015]

According to a first aspect of the present invention, there is provided an on-vehicle electronic device, comprising: vehicle identification means for identifying a vehicle type based on a state of a plurality of bit codes by a vehicle identification wiring; Within a certain period, the characteristic specifications of the on-vehicle electronic device are set based on the characteristic parameters selected corresponding to the vehicle type identified by the vehicle identification means from the characteristic parameters set in advance,
During that period, a control means for inhibiting a part of the functions of the on-vehicle electronic device is provided.

According to a second aspect of the present invention, a sound quality sound field parameter corresponding to each vehicle type is set in advance as a characteristic parameter, and the control means controls the reproduced sound quality sound field characteristic according to the selected sound quality sound field parameter. Is set, and during that time, the sound output level is suppressed to a predetermined value or less.

According to a third aspect of the present invention, in the vehicle-mounted electronic device, a predetermined theft detection bit code is assigned to a vehicle identification bit code by a vehicle identification wiring, and when the vehicle identification means detects this, the vehicle identification device detects the theft. The function of the on-vehicle electronic device is stopped.

According to a fourth aspect of the present invention, the on-vehicle electronic device uses a bit code having a ground level or a power supply voltage level as the theft detection bit code.

According to a fifth aspect of the present invention, there is provided an on-vehicle electronic device wherein the vehicle identification information separated and extracted by the separation and extraction means from the multiplex transmission signal multiplexed on the electric wiring in the vehicle by the multiplex transmission means and transmitted. Vehicle identification means for identifying a vehicle type based on the vehicle type, and setting of characteristic specifications of the on-vehicle electronic device based on characteristic parameters selected corresponding to the vehicle type identified by the vehicle identification means from preset characteristic parameters. Is provided.

According to a sixth aspect of the present invention, there is provided an on-vehicle electronic device using an accessory power supply wiring as an electric wiring in a vehicle for transmitting a multiplex transmission signal.

According to a seventh aspect of the present invention, there is provided an on-vehicle electronic device using a speaker wiring as an electric wiring in a vehicle for transmitting a multiplex transmission signal.

According to an eighth aspect of the present invention, the vehicle identification information is generated by the vehicle identification information generating means only within a predetermined time immediately after the accessory power is supplied.

According to a ninth aspect of the present invention, there is provided an on-vehicle electronic device using a remote control signal wiring as an electric wiring in a vehicle for transmitting a multiplex transmission signal.

According to a tenth aspect of the present invention, there is provided an on-vehicle electronic device,
The vehicle identification means for identifying the vehicle type based on the electric impedance between the vehicle identification wirings analyzed by the impedance analysis means, and a vehicle characteristic selected from among preset characteristic parameters corresponding to the vehicle type identified by the vehicle identification means. There is provided control means for setting characteristic specifications of the on-vehicle electronic device based on the characteristic parameters.

According to the eleventh aspect of the present invention, there is provided an on-vehicle electronic device,
As the impedance analysis means, a means for identifying whether an open state or a short-circuit state between the vehicle identification wirings is used.

According to a twelfth aspect of the present invention, there is provided an on-vehicle electronic device,
As the impedance analysis means, means for detecting resonance of a resonance circuit element connected as electric impedance between vehicle identification wirings is used.

According to a thirteenth aspect of the present invention, there is provided a vehicle-mounted electronic device comprising:
Display parameters for changing the display pattern of the two-dimensional display device are set in advance as characteristic parameters in accordance with each vehicle type, and the control means performs two-dimensional control according to the display parameters selected according to the type of the vehicle. The display pattern of the display device is set.

According to a fourteenth aspect of the present invention, there is provided an on-vehicle electronic device,
A conversion coefficient for calculating the traveling distance from the vehicle speed as a characteristic parameter is set in advance in correspondence with each type of vehicle, and the traveling distance estimating means determines the traveling distance of the vehicle in accordance with the conversion coefficient selected according to the type of the vehicle. The mileage is estimated.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing the overall configuration of a vehicle-mounted electronic device according to Embodiment 1 of the present invention. In this case, as in the conventional case, a vehicle-mounted acoustic device will be described as an example. In the figure, the same reference numerals as those in FIG.

Reference numeral 11 denotes a vehicle wiring harness used for various electric wirings in the vehicle. Reference numeral 12 denotes a vehicle wiring connector for connecting the vehicle wiring harness 11. 15a, 15
b denotes a plurality of vehicle identification wirings which are connected to the vehicle wiring connector 12 and form vehicle electric wiring together with the vehicle wiring harness 11, and 16 denotes the vehicle identification wirings 15a, 1b.
5b is a vehicle identification information generating circuit for setting vehicle identification information for identifying the type of vehicle by a plurality of bit codes by setting each of the battery 5b to a state of battery potential or ground. Reference numeral 13a denotes a vehicle type identification circuit as vehicle identification means for identifying the type of the vehicle based on the state of the bit codes of the vehicle identification wires 15a and 15b. In addition, 1
Reference numeral 3b denotes a ROM serving as parameter storage means different from the one designated by the same reference numeral in FIG. 28 in that characteristic parameters are stored in advance for each type of vehicle. Reference numeral 13 denotes a vehicle type identification circuit 13a. FIG. 2 shows that the corresponding characteristic parameter is read from the ROM 13b based on the identification result, and the characteristic specification of the vehicle-mounted acoustic device is set.
8 is a control circuit as control means, which is different from the one having the same reference numeral 8.

FIG. 2 is a block diagram showing a specific example of the vehicle identification information generating circuit 16. In the figure, reference numeral 16a designates a vehicle identification wiring 15a as a battery potential V _B or a ground GN.
D is a switch for setting any state of D
Is a switch for setting the vehicle identification wiring 15b to one of the battery potential V _B and the ground GND. In the illustrated case, the vehicle identification wiring 15a is set to the battery potential V _B , and the vehicle identification wiring 15b is set to the ground GND.

Next, the operation will be described. In FIG. 1, vehicle identification wirings 15 a, 1
5b are additionally provided, and these are connected to the vehicle electrical wiring connector 1
2, the vehicle type identification circuit 13a obtains vehicle identification information from the state of the bit code of the vehicle identification wiring 15a, 15b to identify the vehicle type. By increasing the number of bits by the vehicle identification wirings 15a and 15b, it is possible to set the vehicle type to the square of the number of input bits.
As shown in FIG. 2, two vehicle identification wirings 15a and 15b
Let's consider a case where Vehicle identification wiring 15a, 1
5b, as shown in the table of FIG. 3 (a), each having one of the following states or the ground GND or a battery voltage V _B, respectively 4 state of the combination of A car ~D vehicles Is associated with. That is, as shown in FIG. 4B, four types of vehicle identification codes “01”, “10”,
“00” and “11” make it possible to identify four types of vehicles A, B, C and D. The vehicle type identification circuit 13a identifies the type of the vehicle based on the bit codes of the vehicle identification wires 15a and 15b.

Here, the sound quality adjustment circuit 22a and the sound field adjustment circuit 22b are connected to the DSP 22 as in the conventional case.
This is a digital signal processing circuit configured with an algorithm by the above-described program. The frequency characteristics and the sound field characteristics obtained by combining the reflected sound component, the reverberant sound component, and the indirect sound component can be set by the coefficient setting from the control circuit 13. Now ROM
In 13b, the coefficients of the sound quality adjustment circuit 22a and the sound field adjustment circuit 22b having the sound quality specifications for each vehicle type are stored as characteristic parameters, and the control circuit 13 performs the control based on the identification result of the vehicle type identification circuit 13a. The corresponding characteristic parameters are read from the ROM 13b and the coefficients are set in the DSP 22. This makes it possible to set the optimum reproduction sound quality and sound field characteristics for the vehicle type by automatic identification corresponding to the vehicle to which the vehicle-mounted acoustic device is connected. The setting of the reproduced sound quality and the sound field characteristic is performed only within a predetermined time after the accessory power is turned on, and during that time, the mute circuit 25 is operated to perform muting.

The procedure for setting the characteristics will be described with reference to the flowchart shown in FIG. In step ST1, the turning on of the accessory power of the vehicle is monitored. When the accessory power is turned on and the power of the vehicle-mounted audio device is turned on, the process proceeds to step ST2, and the parameter setting prohibition flag is released. The parameter setting prohibition flag is a flag for prohibiting the setting of the reproduction sound quality sound field characteristic in a normal use state. By setting the flag, the sound output of the vehicle-mounted acoustic device during the reproduction operation is stopped or the reproduction sound quality sound field is set. Changes in characteristics are prevented beforehand. Next, in step ST3, an audio mute signal is transmitted to operate the mute circuit 25 to perform muting, and in step ST4, the vehicle type identification circuit 13a takes in the vehicle identification code through the vehicle identification wires 15a and 15b. Next, the captured vehicle identification code is a code “01” corresponding to the vehicle A, a code “10” corresponding to the vehicle B, a code “00” corresponding to the vehicle C, or a code corresponding to the vehicle D. Identification of “11” is performed in steps ST5 to ST8. The identification result is sent to the control circuit 13, and the control circuit 13 reads the corresponding characteristic parameter of the sound field characteristic from the ROM 13b based on the identification result in step ST9,
Transfer to SP22 for setting. Then, step ST1
At 0, the audio mute signal to the mute circuit 25 is released, and at step ST11, a parameter setting prohibition flag is set, and this series of processing ends.

The characteristic parameters of the sound field sound field characteristics for each vehicle type are determined in advance by analyzing the vehicle interior acoustic characteristics and the audio signal processing characteristics for correcting the sound field and the sound quality for each vehicle type. . As the analysis means, the acoustic transfer characteristics of the passenger compartment are measured using a microphone, a frequency analyzer, or the like, and the parameters of the DSP 22 for which the transfer characteristics are to be corrected are obtained by computer simulation, a try-and-error method based on audibility evaluation, and the like. . The characteristic parameters of the sound quality sound field characteristics thus obtained are
As many as the number of types of vehicles on which the on-vehicle audio device is to be mounted, for example, the RO type code-parameter correspondence table shown in FIG.
This is stored in M13b.

FIG. 5A is a sound quality sound field parameter table corresponding to four types of vehicles, that is, vehicles A to D. In the figure, U-1 to U-5 are for car A, X-1 to X-5 are for car B, Y
-1 to Y-5 are symbols representing the sound quality characteristics of the C car, and Z-1 to Z-5 are symbols representing the sound quality characteristics of the D car, and the same symbols represent the same characteristics. For example, the front left and front right of car B are X-1
Have the same sound quality characteristics.

FIG. 5B shows details of the characteristics of the car D as an example. In the figure, the presence 1, the presence 2, etc. represent the type of filter, and the peak (peak) represented by the center frequency f, the quality factor Q (Q = f / B, B is the bandwidth at −3 dB), and the gain G ) And valley (dip) type frequency filters that are often used in equalizers and the like. Also,
ATT is the amount of attenuation.

FIG. 5C shows DSP parameters for realizing the Z-1 characteristic shown in FIG. 5B. The presence 1, presence 2, and filter characteristics are constituted by IIR filters, and are represented by a signal chart diagram shown in FIG. In the signal chart, Z ⁻¹
Indicates a delay of one sampling period, and C ₀ , C ₁ , C
₂ , C ₃ , C ₄ , and C _ATT indicate multiplication coefficients. These coefficients are stored in the ROM 13b.
(C) As shown in the lower part of FIG.
It is stored as a numerical value up to 1. In the example of FIG. 5C, the coefficient bit length is represented as 32 bits.

The hardware configuration and the signal processing system, that is, the program configuration of the DSP 22 and the control means 13 of the on-vehicle audio system of the first embodiment designed and manufactured in this manner are different depending on the type of the vehicle to be mounted. It is the same even if different. Therefore, there is obtained a great advantage in the production system that the design efficiency is good and the models are standardized into one, which also contributes to the cost reduction of the product. Also,
The user is freed from troublesome operations for sound quality and sound field correction. Further, the reproduction sound quality sound field characteristics are set only within a predetermined time after the accessory power supply is turned on. During this time, muting is applied by the mute circuit 25. After the muting is released, identification of the vehicle type and reproduction sound quality sound field are performed. Since the setting of the characteristics is not performed until the next time the accessory power is turned on, it is possible to prevent an unexpected stop of the sound output and a change in the sound quality and the sound field characteristics during music reproduction or the like.

Embodiment 2 This embodiment provides an in-vehicle electronic device having a simple anti-theft function as an application of the vehicle identification information generating means and the vehicle type identification function. Although the configuration is the same as that of the first embodiment shown in FIG. 1, the vehicle type identification circuit 13a as the vehicle identification means includes a specific one of the bit codes of the vehicle identification wirings 15a and 15b, For example, it is formed so that "00" is recognized as a theft detection bit code.

Vehicle identification wiring 15 in on-vehicle electronic device
Generally, the signal form of a and 15b is unknown to the person who stole it. If the vehicle in which the vehicle-mounted electronic device is to be used is of a vehicle type different from the vehicle used immediately before being stolen, the vehicle identification wiring 15a forming the vehicle electric wiring together with the vehicle wiring harness 11 , 15b, or what the signal form means, if any, is unknown. Therefore, when a thief mounts a stolen electronic device on a different vehicle type, generally, all pins of the vehicle wiring connector 12 corresponding to the vehicle identification wirings 15a and 15b are in an open state or a ground state. In these two cases, control by the control means 13 is performed so that the main device does not operate, thereby obtaining the effect of preventing theft.

The operation procedure will be described with reference to the flowchart shown in FIG. In step ST21, the turning on of the accessory power supply of the vehicle is monitored. When the accessory power supply is turned on and the power supply of the on-vehicle audio device is turned on, the process proceeds to step ST22, and the vehicle identification code is fetched. Next, in step ST23, each bit of the taken vehicle identification code is logically added, and it is confirmed whether or not the logical sum is "0". If the logical sum is "1", the process branches to step ST24 to perform the normal sound quality setting processing as described in the first embodiment, and permits key input from the key input switch 14 in step ST25. on the other hand,
If the logical sum is "0", the process branches to step ST26, shifts to the theft mode, stops the function of the on-vehicle audio device, and disables all key inputs of the key input switch 14 in step ST27. Therefore, the vehicle identification wiring 15
If both a and 15b are open or grounded, the on-vehicle electronic device does not operate. This makes it possible to provide a simple but anti-theft function.

As described above, "0" is used as the theft detection bit code.
Although the case where “0” is used has been described, “11” may be used as this theft detection bit code, so that the pins of the vehicle wiring connector 12 corresponding to the vehicle identification wirings 15a and 15b are eventually turned off. Is controlled so that the main unit does not operate when the power supply voltage level is attained, and the effect of preventing theft is obtained.
In step ST23 of FIG. 6, each bit of the vehicle identification code is checked to determine whether the logical product is "1". If the logical product is not "1", the process branches to step ST24, and if "1", the process branches to step ST26. Let it.

Embodiment 3 FIG. FIG. 7 is a block diagram showing an in-vehicle electronic device according to Embodiment 3 of the present invention. The corresponding portions are denoted by the same reference numerals as in FIG. 1 and description thereof is omitted.
In the figure, reference numeral 20 denotes a controlled device that collectively illustrates components denoted by reference numerals 21 to 28 in FIG. Reference numeral 31 denotes a vehicle identification information generating means which is installed in the vehicle and generates vehicle identification information for identifying the type of the vehicle. In this case, the battery voltage is divided by the resistance values R ₁ and R ₂ . the oscillation output of the voltage controlled oscillator 31a whose oscillation frequency is controlled by the control voltages V ₁ is set to the vehicle identification information. 2
Reference numeral 9 denotes one of the in-vehicle electric wirings in the vehicle wiring harness 11, which is an accessory power supply wiring for transmitting power supplied to the accessory, and 33 is an accessory switch for turning on / off the power supply to the accessory. is there. Reference numeral 30 denotes a multiplex transmission means for multiplex transmitting the vehicle identification information generated by the vehicle identification information generation means 31 to the accessory power supply wiring 29. In this case, the oscillation output of the voltage control oscillator 31a is used by using the modulation coil 30a. Are superimposed on the accessory power supply wiring 29. Reference numeral 35 denotes a separating and extracting means for separating and extracting the component of the vehicle identification information from the multiplex transmission signal transmitted on the accessory power supply wiring 29, and 13c.
Is a pulse count circuit that detects the frequency of the vehicle identification information extracted by the separation and extraction means 35 and sends it to the vehicle type identification circuit 13a as the vehicle identification means.

FIG. 8 is a block diagram showing the internal configuration of the separation / extraction means 35. In the figure, reference numeral 35a denotes a low-pass filter (hereinafter, LP) for separating a DC component from a multiplex transmission signal transmitted on the accessory power supply wiring 29.
F), 35b is a high-pass filter (hereinafter, referred to as HPF) for separating and extracting the component of the vehicle identification information from the multiplex transmission signal transmitted on the accessory power supply wiring 29, and 35c is the vehicle identification separated by the HPF 35b. This is a decoder circuit that converts information into a signal that can be captured by the pulse count circuit 13c.

Next, the operation will be described. In the first embodiment, the vehicle identification information is transmitted to the vehicle identification wirings 15a and 15a.
Although the case of obtaining from the bit code b has been described, the third embodiment provides an in-vehicle electronic device in which the vehicle identification wiring can be omitted. In this case, for example, as shown in an oscillation frequency-vehicle type correspondence table in FIG. 9, vehicle identification information of a voltage-controlled oscillator oscillation frequency that is different for each vehicle type is set.
Here, the current transmitted by the accessory power supply wiring 29 is a direct current supplied from a storage battery in the vehicle-mounted electronic device. Therefore, although the modulation frequency of the vehicle identification information superimposed on the modulation frequency may be considerably low, the voltage control oscillator 31a of the vehicle identification information generation means 31 and the modulation coil 30a of the multiplex transmission means 30 may be used.
Is because the size of circuit components is large for low frequency,
The oscillation frequency of the voltage controlled oscillator 31a is suitably selected in a range of about 20 kHz to 100 kHz as shown in FIG.

In the vehicle identification information generating means 31, predetermined resistance values R ₁ and R ₂ for determining a control voltage V ₁ for generating vehicle identification information are set in advance in accordance with the type of the vehicle. Voltage controlled oscillator 31a generates a vehicle identification information for identifying the type of the vehicle oscillates at a predetermined frequency determined by the control voltage V _1, the multiplex transmission unit 30 is a voltage controlled oscillator 3 in the modulating winding 30a
The vehicle identification information based on the oscillated high frequency sine wave of 1a is superimposed on the accessory power supply wiring 29. The multiplex transmission signal obtained by superimposing the vehicle identification information on the DC power supply to the accessory is separated and extracted by the LPF 35a and the HPF 35 by the separation / extraction means 35.
By b, the accessory power supply and the vehicle type information are separated. That is, the LPF 35a allows only the accessory power source, which is a DC component, to pass therethrough and output the accessory power source circuit to the HPF 35a.
35b passes only the vehicle identification information which is an AC component and sends it to the decoder circuit 35c. The decoder circuit 35c converts the input vehicle identification information into a signal that can be captured by the pulse count circuit 13c. In this manner, by multiplexing the vehicle identification information on the accessory power supply wiring 29 and transmitting the transmission, the vehicle identification information can be transmitted without separately providing the vehicle identification wirings 15a and 15b, and an increase in the number of wirings can be prevented. .

FIG. 10 shows a, b, c, and c of the separation / extraction means 35 and the pulse count circuit 13c in FIG.
FIG. 9 is an operation state diagram showing a waveform model of voltage versus time of each unit indicated by d and e. 10A is a waveform of a multiplex transmission signal input from the accessory power supply wiring 29 to the separation / extraction means 35, FIG. 10B is a waveform after passing through the LPF 35a, and FIG. 10C is a waveform after passing through the HPF 35b. Waveform
FIG. 3D shows the waveform after passing through the decoder circuit 35c, and FIG.
5 is a waveform of an interrupt signal sent to the oscilloscope. Decoder circuit 35
c forms the sine wave of the vehicle identification information shown in FIG. 10C passing through the HPF 35b into the rectangular wave shown in FIG.
The pulse count circuit 13c counts the number of rising edges n (times) of the pulse shown in FIG. 3D during the period T (sec) of the interrupt signal shown in FIG. n (sec) is calculated and the vehicle type identification circuit 13 is calculated.
Send to a.

The procedure for setting the characteristics will be described with reference to the flowchart shown in FIG. In step ST31, the turning on of the accessory power supply of the vehicle is monitored. When the accessory power supply is turned on and the power supply of the vehicle-mounted audio device is turned on, in step ST32, the vehicle type identification circuit 13 is turned on.
“a” captures the period t calculated by the pulse count circuit 13c. Then, either within captured period t is the period t ₀ ~t ₁ corresponding to A car oscillation frequency versus vehicle type association table shown in FIG. 9, the range of the period t ₂ ~t ₃ corresponding to B vehicles Inside or C
Or within the period t ₄ ~t ₅ corresponding to cars, or the identification of how the range of the period t ₆ ~t ₇ corresponding to D vehicles, performed in step ST33～ST36. The discrimination result is sent to the control means 13, and in step ST37, the control means 13 reads the characteristic parameter of the corresponding sound quality sound field characteristic from the ROM 13b based on the discrimination result, and reads out the DSP 22
Transfer to

By adopting such a multiplex transmission method, the original signal (power supply) and the vehicle identification information can be effectively separated, and the mutual influence can be eliminated. There is no need to provide wiring.

Embodiment 4 FIG. In the third embodiment, the case where the vehicle identification information is multiplexed and transmitted using the accessory power supply wiring 29 in the electric wiring in the vehicle has been described. Alternatively, a part of the speaker wiring in the electric wiring in the vehicle may be used.

FIG. 12 is a block diagram showing a vehicle-mounted electronic device according to Embodiment 4 of the present invention.
The same reference numerals are given and the description is omitted. In the figure,
Reference numeral 27 denotes a power amplifier that is taken out of the controlled device 20 and separately described, and 28 denotes a speaker, and 36a, 3
Reference numeral 6b denotes one of in-vehicle electrical wirings in the vehicle wiring harness 11, which is a speaker wiring connecting the power amplifier 27 and the speaker 28. In this embodiment, the multiplex transmission means 30 using the modulation coil 30a is provided on one of the speaker wires 36a, and the vehicle identification information from the vehicle identification information generation means 31 is multiplexed. The signal flowing through the speaker wirings 36a and 36b is generally 20 Hz.
Since the audio signal is a band of up to 20 kHz, the oscillation frequency of the voltage-controlled oscillator for vehicle identification information is 100 kHz.
Hz to 1 MHz is appropriate. FIG. 13 shows an example of the oscillation frequency-vehicle type correspondence table in the fourth embodiment.

Next, the procedure for setting the characteristics will be described with reference to the flowchart of FIG. 11 used in the third embodiment. As in the case of the third embodiment, when the power of the on-vehicle acoustic device is turned on, the pulse count circuit 13c is turned on in step ST32.
From the cycle t. Then, whether it is within the range of the period t ₀ ~t ₁ corresponding to A car to the map illustrated in FIG. 13, B
A period t ₂ to t ₃ corresponding to the vehicle, a period t ₄ to t ₅ corresponding to the C vehicle, or a period t ₆ corresponding to the D vehicle
Or in the range of ~t _7, identifies in step ST33～ST36. Next, in step ST37, the control unit 13
Reads the characteristic parameter of the corresponding sound quality sound field characteristic from the ROM 13b based on the identification result and
Transfer to

Embodiment 5 FIG. Further, in the case where the on-vehicle electronic device is composed of a plurality of electronic devices, one of which remotely controls the operation of the other, a remote controller wiring can be used for transmitting vehicle identification information. FIG. 14 is a block diagram showing an in-vehicle electronic device according to Embodiment 5 of the present invention. The corresponding parts are denoted by the same reference numerals as in FIG. 7 and description thereof is omitted. In the figure, reference numeral 37 denotes a remote controller for the remote control, and reference numeral 38 denotes one of the in-vehicle electric wirings in the vehicle wiring harness 11, and a remote controller signal wiring for connecting the remote controller 37 to a main body device. In the remote controller 37, reference numeral 37a denotes a key input switch for performing an input operation, 37b denotes an encoder circuit for encoding an input signal from the key input switch 37a, and 37c performs a switching operation by an output of the encoder circuit 37b. Signal to remote controller signal wiring 3
8 is a switching transistor that outputs a signal to the switching transistor 8.

The vehicle identification information generating means 31 in the fifth embodiment is configured to output the vehicle identification information only within a predetermined time immediately after the accessory power is supplied. In the vehicle identification information generating means 31, a one-shot multivibrator 31b is turned on for a predetermined time to start the voltage control oscillator 31a when the supply of accessory power is started. 30b performs a switching operation based on the vehicle identification information that voltage controlled oscillator 31a is generated based on the control voltage V _1, the remote controller signal wiring vehicle identification information 38
The multiplex transmission means 30 is formed by the switching transistor 30b. Further, the pulse count circuit 13c also functions as separation and extraction means for separating and extracting vehicle identification information from the multiplex transmission signal transmitted through the remote controller signal wiring 38.

Here, the remote controller signal wiring 3
The signal transmitted on 8 is a digital signal according to "0" or "1". Generally, since the remote controller signal has a frequency band of 100 Hz to 10 kHz,
The oscillation frequency of the voltage controlled oscillator for vehicle identification information is 10
It is appropriate to set the frequency to 0 kHz to 1 MHz. Therefore, the table shown in FIG. 13 is used for the oscillation frequency-vehicle type correspondence table in the fifth embodiment as in the case of the fourth embodiment.

Next, the operation will be described. Here, FIG.
FIG. 5 is an operation state diagram showing a voltage vs. time waveform model of each part indicated by a, b, c, d, and e in FIG. That is,
FIG. 15A shows the waveform of the power supply to the accessory, and FIG.
FIG. 4C shows the output waveform of the one-shot multivibrator 31b, FIG. 4C shows the signal waveform on the remote controller signal wiring 38, FIG. 4D shows the input waveform from the key input switch 37a of the remote controller 37, and FIG. ) Is an interrupt signal waveform sent from the control means 13 to the pulse count circuit 13c, which is a time slot signal for pulse counting. In FIG. 15C, a portion indicated by x is a transmission interval of vehicle identification information, and a portion indicated by y is a transmission interval of key input information of the remote controller 37, that is, a transmission interval of a remote controller signal. The one-shot multivibrator 31b functions as a timer for outputting the vehicle identification information only within a predetermined time immediately after the accessory power is supplied.

Next, the procedure for setting the characteristics will be described with reference to the flowchart of FIG. 11 used in the third and fourth embodiments. As in the above embodiments, when the power supply of the on-vehicle acoustic device is turned on, the cycle t from the pulse count circuit 13c is fetched in step ST32. Then, whether it is within the range of the period t ₀ ~t ₁ corresponding to A car to the map illustrated in FIG. 13, the period t ₂ ~t ₃ corresponding to B vehicles
Or in the range of, or within the period t ₄ ~t ₅ corresponding to the C cars, whether within the period t ₆ ~t ₇ corresponding to D vehicles, identifies in step ST33～ST36. Next, in step ST37, the control means 13 reads out the characteristic parameter of the corresponding sound quality sound field characteristic from the ROM 13b based on the identification result and transfers it to the DSP 22.

As described above, the vehicle identification information is output only within a predetermined time immediately after the accessory power is supplied, and the transmission of the vehicle identification information is transmitted to the remote controller signal wiring 38.
In this case, the multiplex transmission means 30 can be simplified, and the pulse count circuit 13c can function as the separation / extraction means. Therefore, the apparatus configuration is simplified and the apparatus cost is reduced. Contribute.

Embodiment 6 FIG. FIG. 16 is a block diagram showing an in-vehicle electronic device according to Embodiment 6 of the present invention, in which corresponding parts are denoted by the same reference numerals as in FIG. 1 and description thereof is omitted. In the figure, reference numeral 39 denotes a pair of vehicle identification wirings 15a,
15b, the impedance element of which the value is set in accordance with the type of the vehicle. In the sixth embodiment, the vehicle identification information for identifying the vehicle type is set by the impedance value of the impedance element 39. Is done. Numeral 40 denotes an impedance analyzing means for analyzing the electric impedance between the vehicle identification wirings 15a and 15b and notifying the result to the vehicle type identification circuit 13a.

Next, the operation will be described. In the sixth embodiment, as shown in FIG.
The vehicle type is identified by connecting an impedance element 39 having a predetermined impedance value corresponding to the vehicle type between the two lines 15b. Vehicle identification wiring 15a, 15b
Is connected to the impedance analyzing means 40 via the vehicle wiring connector 12, and the impedance analyzing means 40
A predetermined value is obtained by analyzing the impedance between the vehicle identification wirings 15a and 15b or a physical quantity correlated therewith. The obtained impedance value is sent to the vehicle type identification circuit 13a, and a determination is made as to which vehicle type the impedance value corresponds to. The impedance element 39 may be a resistance element, a capacitor element, or an electric resonance element including a coil and a capacitor. The position where these impedance elements 39 are connected to the vehicle identification wirings 15a and 15b may be very close to the vehicle wiring connector 12, so that the required wiring length can be shortened. Also, since no power supply or ground wiring is required, installation is simple.

As described above, in the sixth embodiment, the first embodiment sets the vehicle identification wirings 15a and 15b to the power supply voltage or the ground voltage by the vehicle type identification circuit 13a shown in FIG. Therefore, there are restrictions such as that only two bits of information can be set with the two vehicle identification wirings 15a and 15b and that wiring to a power supply portion and a grounding portion is required. On the other hand, in the sixth embodiment, if the impedance value of the impedance element 39 to be connected is changed, various types of vehicle identification information can be set by the two vehicle identification wirings 15a and 15b. Wiring to the ground part is unnecessary. Further, in the third to fifth embodiments, the vehicle identification information is multiplexed and transmitted with other power sources and signals, thereby eliminating the necessity of a dedicated wiring for the vehicle identification information. However, in the sixth embodiment, such additional means are not required.

As an extreme example, when it is only necessary to identify two vehicle types, the impedance element 39 is opened between the two wires of the vehicle identification wirings 15a and 15b, that is, the impedance value is infinite or the impedance value is infinite. A short circuit between the lines, that is, a case where the impedance value is zero may be used. In this case, it is not necessary to consider the cost of the impedance element 39.

Embodiment 7 FIG. Further, if the above-described resonance circuit element is used as the impedance element 39, vehicle identification information capable of identifying various types of vehicles can be provided by only two vehicle identification wirings. FIG. 17 is a block diagram showing the internal configuration of the impedance analysis means 40 in the on-vehicle electronic device according to Embodiment 7 of the present invention. In the figure, 39a is a vehicle identification wiring 15a,
15b, as the electrical impedance for setting the vehicle identification information connected between the vehicle identification wires 15a and 15b.
This is a resonance circuit element including a coil and a capacitor, which is connected between 5b. An oscillator 40a oscillates at a frequency f set by the control means 13, a smoothing circuit 40b smoothes an oscillation signal of the oscillator 40a returned through the resonance circuit element 39a, and a smoothing circuit 40c. A rectifier circuit for rectifying the output, 40d is a comparator for comparing the rectified output with a predetermined threshold value and notifying the result to the vehicle type identification circuit 13a.

Next, the operation will be described. The oscillator 40a of the impedance analyzer 40 oscillates at the frequency f specified by the frequency setting data provided from the controller 13 in FIG. The oscillation signal of the oscillator 40a returns to the smoothing circuit 40b via the vehicle identification wiring 15a, the resonance circuit element 39a, and the vehicle identification wiring 15b, and is smoothed. The output of this smoothing circuit 40b is a rectifier circuit 40c.
Therefore, a DC potential corresponding to the degree of resonance of the resonance circuit element 39a is output from the rectification circuit 40c. The output of the rectifier circuit 40c is sent to a comparator 40d where it is compared with a predetermined threshold (logic level). The output of the comparator 40d, that is, the output of the impedance analysis means 40, is sent to the vehicle type identification circuit 13a.
a is also supplied with the frequency setting data from the control means. The vehicle type identification circuit 13a identifies the vehicle type from these two signals and notifies the control means 13.

FIG. 18 is an operation state diagram showing a waveform model of voltage versus time in each part shown by a, b, c, and d in FIG. That is, this figure _{(a 1) ~ (a 3} ) an oscillator 4
0a of the output waveform, FIG. _{(B 1) ~ (b 3} ) is a smoothing circuit 4
0b, the waveforms (c ₁ ) to (c ₃ ) in FIG.
0c of the output waveform, FIG. _{(D 1) ~ (d 3} ) shows the output waveform of the comparator 40d. In the circuit shown in FIG. 17, the oscillator 40a sends out a pulse signal as shown in FIG. 18 (a ₁ ) to one of the vehicle identification wirings 15a in accordance with a designation from the control means 13. This signal is returned to the smoothing circuit 40b from the other vehicle identification wiring 15b via the resonance circuit element 39a including a coil and a capacitor.
The signal is smoothed as shown in FIG. (B ₁₎ in the smoothing circuit 40b is sent to the rectifier circuit 40c, is rectified as shown in FIG. (C _1). Similarly, the pulse signal shown in FIG. (A ₂₎ is rectified as shown in FIG. (C _2), FIG (a
_The pulse signal shown in ₃ ) is rectified as shown in FIG. As described above, the signal output from the rectifier circuit 40c becomes a large voltage when the frequency f specified by the control unit 13 matches the resonance frequency of the resonance circuit element 39a. Therefore, compared with the rectifier circuit a predetermined threshold (logic level) in the comparator 40d outputs of 40c V _S, pulsed signals shown in this, as shown in FIG. (D ₁₎ FIG. (A ₁₎ (D ₂ ) and (d ₃ ), the comparator output corresponding to the pulse signal shown in (a ₂ ) and (a ₃ ) Low level. The vehicle type identification circuit 13a uses the frequency setting data designated by the control means 13 when the output signal of the comparator 40d goes to a high level, for example, based on the resonance frequency vs. vehicle type correspondence table shown in FIG. And notifies the control means 13 of it.

Hereinafter, the procedure of impedance analysis, vehicle type identification, and characteristic setting will be described with reference to the flowchart shown in FIG. It should be noted that this procedure is expressed in a form that includes the actions of the control means 13, the impedance analysis means 40, and the vehicle type identification circuit 13a. When the accessory power is turned on, impedance analysis is started in step ST41. First, in step ST42, the oscillation frequency f of the oscillator 40a is set to f ₀ by the control means 13, and in step ST43, the oscillator 40a sends a pulse signal of the frequency f _{0 to} the resonance circuit element 39a from the vehicle identification wiring 15a. Send out. Next, step ST44
, The resonance circuit element 3 via the vehicle identification wiring 15b
Smoothing the signal returned from 9a by the smoothing circuit 40b, and rectifies it by the rectifier circuit 40c FIG _{18 (c 1) ~ (c} 3)
Is generated. Next, in step ST45, the signal is set to a predetermined threshold (logic level) V _S
Check if this is the case. As a result, if it is equal to or greater than the threshold value V _S , the process branches to step ST46, where the resonance frequency of the resonance circuit element 39a is determined to be f _0, and
7, the type of the vehicle is identified as the vehicle type corresponding to the resonance frequency f ₀ . On the other hand, if it is equal to or smaller than the threshold value V _{S, the} flow branches to step ST48 to set the oscillation frequency f to a predetermined value Δ
The above analysis is repeated while increasing by f. This process is repeated until the oscillation frequency f is detected to have reached the analysis upper limit frequency f _L at step ST 49, when it reaches the analytical limit frequency f _L is detected, the step S
The process branches to T50, where it is determined that there is no corresponding vehicle type, and a series of processing ends.

Embodiment 8 FIG. As described above, the in-vehicle electronic devices according to the first to seventh embodiments have been described with reference to the in-vehicle acoustic device as a specific embodiment. it can.
FIG. 21 is a block diagram showing a vehicle-mounted electronic device according to Embodiment 8 of the present invention. In the figure, reference numeral 41 denotes a two-dimensional display device such as a color monitor using a cathode ray tube or a liquid crystal display (hereinafter, referred to as LCD), or an LCD display provided on a display panel of an on-vehicle audio device. This is a display driving device that drives the display of the three-dimensional display device 41. The other parts are denoted by the same reference numerals as the corresponding parts in FIG. 1, and the description thereof will be omitted.

In these two-dimensional display devices 41, the characteristic specifications such as background color, character color, brightness, and, in some cases, display contents are generally determined by the environment of the cabin of the vehicle in which the two-dimensional display device 41 is mounted. It needs to be adjusted to an appropriate one according to the visual field characteristics of the user with respect to the installation position. Regarding this, a manufacturer has previously provided a dedicated machine corresponding to the vehicle type, or a manual adjustment function has been provided in the apparatus so that a user can adjust the machine. In the eighth embodiment, this adjustment operation is to be automated in the same manner as in the first to seventh embodiments. Hereinafter, a case will be described in which the brightness suitable for the vehicle type is automatically obtained.

FIG. 22 is a block diagram showing the internal configuration of the two-dimensional display device 41 and the display driving device 42. In the figure, reference numeral 41a denotes an LCD panel of the two-dimensional display device 41, 4
Reference numeral 1b denotes an illuminating unit such as a lamp for illuminating the back of the LCD panel 41a, and 41c denotes a housing in which they are stored. Reference numeral 42a denotes a battery power source in the display driving device 42 for causing the illumination means 41b to emit light. Reference numeral 42b denotes a battery power supply which is switched by a brightness adjustment signal provided from the control means 13 and which corresponds to the vehicle type. A current corresponding to the resistance values of the connected resistors _Ra , _Rb , _Rc is applied to the illumination means 41b of the two-dimensional display device 41.
To control the brightness of the illumination means 41b. This luminance adjustment signal is set in accordance with the type of vehicle, and is stored in the ROM 13b in advance in the form of a vehicle type-characteristic parameter correspondence table as shown in FIG. 23, for example. In the brightness adjustment of the two-dimensional display device 41, the control means 13 reads a corresponding characteristic parameter (brightness adjustment signal) from the ROM 13b based on the result of the identification of the type of the vehicle by the vehicle type identification circuit 13a, and reads it from the display driving device. This is performed by setting the position of the electronic switch 42b by transferring the data to the electronic switch 42b.

Next, the procedure for setting the characteristics will be described with reference to the flowchart shown in FIG. In step ST51, the turning on of the accessory power supply of the vehicle is monitored. When the accessory power supply is turned on and the power supply of the in-vehicle display device is turned on, in step ST52, a blank signal is sent as an LCD display signal to the LCD panel of the two-dimensional display device 41. Send to 41a. This blank signal is sent to the LCD panel 41a.
Is sent to the user to indicate to the user that the in-vehicle display device is in a non-display state and is in an initial setting state such as luminance, and to prevent the influence of disturbance. Next, in step ST53, the vehicle type identification circuit 13a takes in the vehicle identification code by the vehicle identification wirings 15a and 15b, and in steps ST54 to ST57, the vehicle identification code is a code corresponding to the vehicle A or a vehicle B. It identifies whether it is a corresponding code, a code corresponding to car C, or a code corresponding to car D. The identification result is sent to the control means 13, and the control means 13 sends out a brightness adjustment signal based on the identification result to the display driving device 42 in step ST58. That is, based on the vehicle type-characteristic parameter correspondence table shown in FIG. 23, the brightness adjustment signal indicating the position of the electronic switch 42b corresponding to the identified type of the vehicle is transferred to the display driving device 42. Then step S
At T59, the control means 13 sends a normal LCD display signal to the two-dimensional display device 41.

In the in-vehicle electronic device according to the eighth embodiment, as in the first to seventh embodiments, the type of the vehicle is identified from the vehicle identification information by the vehicle type identification circuit 13a and identified. By reading the characteristic parameters corresponding to the type of the vehicle from the ROM 13b and setting the characteristic specifications, the display device mounted on the vehicle automatically displays the display characteristics corresponding to the vehicle type, and the user can perform the setting operation. There is an advantage that it is free from the hassle and that one device is shared by several types of vehicles, leading to a reduction in manufacturing costs.

Embodiment 9 FIG. 25 is a block diagram showing an in-vehicle electronic device according to Embodiment 9 of the present invention, which is applied to estimating a traveling distance of a vehicle. In the figure, reference numeral 43 denotes the current position and destination of the vehicle on which it is mounted,
A navigation controller 44 displays a travel route and the like on a map. 44 is a travel distance estimating means for estimating the travel distance of the vehicle and informing the navigation controller 43. 45 is a travel distance estimating means for measuring the vehicle speed of the vehicle. 44 is a vehicle speed sensor provided to the vehicle. The other portions are denoted by the same reference numerals as the corresponding portions in FIG. 21, and the description thereof will be omitted.

Next, the operation will be described. Vehicle speed sensor 4
Numeral 5 converts the rotation of the wheel into an electric pulse signal corresponding to the number of rotations, and detects the vehicle speed of the vehicle from the cycle of the pulse. Therefore, the traveling distance of the vehicle is estimated by converting the period of the pulse output from the vehicle speed sensor 45 by the traveling distance estimating means 44 using a predetermined conversion coefficient determined by each vehicle type. This conversion coefficient is set according to the type of vehicle.
RO in the form of a vehicle type-characteristic parameter correspondence table as shown in
It is stored in advance in M13b. The travel distance is estimated by identifying the type of the vehicle, reading out the corresponding characteristic parameter (conversion coefficient) from the ROM 13b, and transferring it to the travel distance estimating means 44 for setting. Estimated from output.

The procedure for setting the characteristics will be described below with reference to the flowchart shown in FIG. In step ST61, the turning on of the accessory power supply of the vehicle is monitored. When the accessory power supply is turned on and the power supply of the on-vehicle acoustic device is turned on, in step ST62, the vehicle type identification circuit 13a causes the vehicle to be connected to the vehicle by the vehicle identification wiring 15a, 15b. Import the identification code. Next, it is determined in step ST63 to ST66 whether the captured vehicle identification code is a code corresponding to the vehicle A, a code corresponding to the vehicle B, a code corresponding to the vehicle C, or a code corresponding to the vehicle D. Perform in. The discrimination result is sent to the control circuit 13, and in step ST67, the control circuit 13 reads the corresponding conversion coefficient characteristic parameter from the ROM 13b based on the discrimination result and transfers it to the traveling distance estimating means 44.

The estimated value estimated by the traveling distance estimating means 44 is sent to the navigation controller 43, and used together with other information to specify the vehicle position on the map. Here, the traveling distance estimating means 44 is most simply a circuit which divides a predetermined characteristic parameter by a pulse period which is a measurement signal. As shown in FIG. 26, the characteristic parameters (conversion coefficients) are numerical values N ₁ , N ₂ ,...
・ ・Up to now, in the navigation device for estimating the traveling distance, a dedicated device has been provided for each vehicle type. However, according to the vehicle-mounted electronic device of the ninth embodiment, the RO
M13b can be used in common for a plurality of vehicle types whose characteristic parameters are stored, standardization of the device can be realized, and reduction in manufacturing cost.

[0077]

As described above, according to the first aspect of the present invention, within a predetermined time after the accessory power is turned on, the state of the bit code of the vehicle identification wiring is determined according to the type of the vehicle identified by the vehicle identification means. A parameter corresponding to the vehicle type is selected from the characteristic parameters stored in the parameter storage means in advance and the characteristic specification is set, and the operation of some functions of the in-vehicle electronic device is prohibited during the period. With this configuration, each time the accessory power is turned on, the vehicle type is determined, and the appropriate characteristic specifications for the vehicle are automatically set without bothering the user. Not only can it prevent the occurrence of discomfort due to noise or display irregularities during the setting operation, but the same model can be used in common regardless of the type of vehicle installed Because that can, models are standardized, improved design efficiency, production management even if easy, could contribute to the reduction of cost, there is an effect that it is possible to provide a more inexpensive automotive electronics.

According to the second aspect of the present invention, the sound quality sound field parameters are stored in advance in the parameter storage means as the characteristic parameters, and the reproduced sound quality sound field characteristics are set according to the sound quality sound field parameters selected based on the identified vehicle type. However, during the setting period, the sound output level is configured to be suppressed to a predetermined value or less, so that the trouble of the sound quality sound field adjustment in the on-vehicle sound device is reduced, and noise generated unexpectedly at the time of the sound quality sound field adjustment is reduced. This has the effect of preventing the occurrence of discomfort.

According to the third aspect of the present invention, when a theft detection bit code is assigned to a part of the vehicle type identification bit code and the vehicle identification means detects the theft detection bit code, the in-vehicle electronic device is detected. Since the device is configured not to operate, even if the on-vehicle electronic device is stolen and mounted on another vehicle, the device does not normally operate in most cases, and thus has an effect of helping to some extent deter theft.

According to the fourth aspect of the present invention, since all the bit codes at the ground level or the power supply voltage level are configured as the theft detection bit codes, the identification processing is extremely simple such as a logical sum or a logical product. Therefore, it is possible to reduce the cost of the apparatus.

According to the fifth aspect of the present invention, the vehicle identification information for vehicle type identification is multiplexed by the multiplex transmission means with another signal or power source transmitted through the electric wiring in the vehicle, and separated and extracted from the multiplex transmission signal. Extract vehicle identification information by means,
According to the configuration, the characteristic specification is set by selecting the corresponding characteristic parameter from the parameter storage means according to the type of the vehicle identified based on the signal. Can be effectively separated and their mutual effects can be eliminated,
There is an effect that an appropriate characteristic specification can be automatically set without providing a special vehicle identification wiring.

According to the sixth aspect of the present invention, the vehicle identification information is configured to be superimposed on the accessory power supply wiring for transmitting power to the accessory. Therefore, a special vehicle identification wiring is provided in various on-vehicle electronic devices. There is an effect that it is possible to automatically set an appropriate characteristic specification without the need.

According to the seventh aspect of the present invention, the vehicle identification information is superimposed on the speaker wiring for transmitting the audio signal to the speaker. There is an effect that can be achieved without requiring a special vehicle identification wiring.

According to the present invention, the vehicle identification information is generated by the vehicle identification information generating means only within a predetermined time immediately after the accessory power is supplied. Multiplexing means for multiplexing on the electric wiring in the vehicle, and separation and extraction means for extracting vehicle identification information from the multiplexed transmission signal can be simplified.
There is an effect that the device price can be reduced.

According to the ninth aspect of the present invention, since the vehicle identification information is superimposed on the remote controller signal wiring, the automatic setting of the appropriate characteristic specification in the on-vehicle electronic device having the remote controller can be performed by a special vehicle. There is an effect that can be achieved without the need for an identification wiring.

According to the tenth aspect of the present invention, the type of the vehicle is identified based on the analysis result of the electric impedance between the vehicle identification wirings. This makes it possible to eliminate the need for complicated additional means for multiplex transmission, thus providing an effect that simpler vehicle identification becomes possible.

According to the eleventh aspect of the present invention, since the type of the vehicle is identified by the open / short circuit between the vehicle identification wires, the vehicle identification means can be simplified.
There is no need to consider the cost of the impedance element, and the cost of the device can be reduced.

According to the twelfth aspect of the present invention, a resonance circuit element is connected as an impedance element between the vehicle identification wirings and the vehicle type is identified based on the resonance frequency. Various types of vehicle identification can be performed by wiring, and complicated additional means for multiplex transmission is not required, so that there is an effect that simpler vehicle identification becomes possible.

According to the thirteenth aspect, display parameters for changing the display pattern of the two-dimensional display device are previously stored in the parameter storage means as characteristic parameters, and the display parameters selected based on the identified vehicle type are stored. , The display pattern of the two-dimensional display device is set according to the above, so that the type of the vehicle can be determined without mounting the user's hand only by attaching to the vehicle, and an appropriate display suitable for the visibility environment in the room of the vehicle. There is an effect that an in-vehicle display device capable of automatically setting characteristics can be obtained.

According to the fourteenth aspect of the invention, the conversion coefficient between the vehicle speed and the traveling distance is stored in advance in the parameter storage means as the characteristic parameter, and the conversion coefficient selected based on the identified vehicle type is stored in the traveling distance estimating means. Set,
Since the travel distance is estimated from the output of the vehicle speed sensor, it is possible to judge the vehicle type without bothering the user just by attaching it to the vehicle, and to estimate the more accurate travel distance of the vehicle. Thus, when the present invention is applied to an in-vehicle navigation device or the like, there is an effect that the position of the own vehicle can be specified with higher accuracy.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a vehicle-mounted electronic device according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a vehicle identification information generation circuit according to the embodiment.

FIG. 3 is an explanatory diagram showing an example of a characteristic parameter correspondence table in the embodiment.

FIG. 4 is a flowchart showing a procedure for setting characteristics in the embodiment.

FIG. 5 is an explanatory diagram showing an example of a vehicle type code-parameter correspondence table in the embodiment.

FIG. 6 is a flowchart showing an operation procedure of theft prevention in the on-vehicle electronic device according to the second embodiment of the present invention.

FIG. 7 is a block diagram showing a vehicle-mounted electronic device according to a third embodiment of the present invention.

FIG. 8 is a block diagram showing a separation and extraction unit in the embodiment.

FIG. 9 is an explanatory diagram showing an example of an oscillation frequency-vehicle type correspondence table in the embodiment.

FIG. 10 is an operation state diagram showing a waveform model of each unit in the embodiment.

FIG. 11 is a flowchart showing a procedure of characteristic setting in the embodiment.

FIG. 12 is a block diagram showing a vehicle-mounted electronic device according to a fourth embodiment of the present invention.

FIG. 13 is an explanatory diagram showing an example of an oscillation frequency-vehicle type correspondence table in the embodiment.

FIG. 14 is a block diagram showing an in-vehicle electronic device according to a fifth embodiment of the present invention.

FIG. 15 is an operation state diagram showing a waveform model of each unit in the embodiment.

FIG. 16 is a block diagram showing a vehicle-mounted electronic device according to Embodiment 6 of the present invention.

FIG. 17 is a block diagram showing impedance analysis means in the vehicle-mounted electronic device according to the seventh embodiment of the present invention.

FIG. 18 is an operation state diagram showing a waveform model of each unit in the embodiment.

FIG. 19 is an explanatory diagram showing an example of a resonance frequency-vehicle type correspondence table in the embodiment.

FIG. 20 is a flowchart showing a procedure of analysis, identification, and setting in the embodiment.

FIG. 21 is a block diagram showing a vehicle-mounted electronic device according to an eighth embodiment of the present invention.

FIG. 22 is a block diagram illustrating a two-dimensional display device and a display driving device according to the above embodiment.

FIG. 23 is an explanatory diagram showing an example of a vehicle type-characteristic parameter correspondence table in the embodiment.

FIG. 24 is a flowchart showing a procedure for setting characteristics in the embodiment.

FIG. 25 is a block diagram showing a vehicle-mounted electronic device according to a ninth embodiment of the present invention.

FIG. 26 is an explanatory diagram showing an example of a vehicle type-characteristic parameter correspondence table in the embodiment.

FIG. 27 is a flowchart showing a procedure of characteristic setting in the embodiment.

FIG. 28 is a block diagram showing a conventional in-vehicle electronic device.

FIG. 29 is a block diagram showing the sound quality adjustment circuit of FIG. 28;

FIG. 30 is a block diagram showing the sound field adjustment circuit of FIG. 28.

[Explanation of symbols]

13 control means, 13a vehicle type identification circuit (vehicle identification means), 13b ROM (parameter storage means), 13
c pulse count circuit (separation and extraction means), 15a, 1
5b Vehicle identification wiring, 29 accessory power supply wiring (electrical wiring in the vehicle), 30 multiplex transmission means, 31 vehicle identification information generating means, 35 separation and extraction means, 36a, 36b
Speaker wiring (in-vehicle electric wiring), 38 remote controller signal wiring (in-vehicle electric wiring), 39a resonance circuit element, 40 impedance analysis means, 41 two-dimensional display device, 44 mileage estimation means, 45 vehicle speed sensor.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI H04N 5/64 521 H04S 5/02 C H04S 5/02 Q G10K 15/00 M (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60R 11/02 B60R 16/02 660 G10K 15/00 H03G 5/16 H04N 5/64 521 H04S 5/02

Claims (14)

(57) [Claims] A vehicle identification wiring for setting vehicle identification information for identifying a type of the vehicle by a plurality of bit codes;
Vehicle identification means for identifying the type of the vehicle based on the state of a plurality of bit codes by the vehicle identification wiring; parameter storage means for storing in advance characteristic parameters corresponding to each type of the vehicle; Within a predetermined time after the accessory power supply of the vehicle is turned on, a characteristic parameter corresponding to the identification result of the vehicle identification means is read from the parameter storage means to set a characteristic specification. A vehicle-mounted electronic device comprising: control means for prohibiting the operation of a part of the functions. 2. A reproduction sound quality sound field parameter is set in advance in the parameter storage means as a characteristic parameter corresponding to the type of the vehicle, and the control means stores the parameter in the identification result of the vehicle identification means from the parameter storage means. Setting the reproduced sound quality sound field characteristics in accordance with the reproduced sound quality sound field parameters read out based on the reproduced sound quality, and suppressing the sound output level from the vehicle-mounted electronic device to a predetermined level or less within the predetermined time. The vehicle-mounted electronic device according to claim 1. 3. A vehicle identification wiring for setting vehicle identification information for identifying a type of vehicle by a plurality of bit codes,
Vehicle identification means for identifying the type of the vehicle based on the state of the plurality of bit codes by the vehicle identification wiring, and identifying a predetermined bit code in the bit code as a theft detection bit code; A parameter storage unit that stores in advance characteristic parameters corresponding to each type of vehicle, and a characteristic parameter corresponding to the identification result of the vehicle identification unit is read out from the parameter storage unit to set characteristic specifications, and Control means for stopping the function of the on-vehicle electronic device when the identification means identifies the theft detection bit. 4. The in-vehicle electronic device according to claim 3, wherein all of the bit codes of the vehicle identification wiring, which have a ground level or a power supply voltage level, are used as the theft detection bit codes. . 5. A vehicle identification information generating means installed in a vehicle for generating vehicle identification information for identifying a type of the vehicle, and an electric wiring in the vehicle for generating the vehicle identification information generated by the vehicle identification information generating means. Multiplex transmission means for multiplex transmission, and separation and extraction means for separating and extracting the vehicle identification information from the multiplex transmission signal transmitted through the in-vehicle electrical wiring,
Vehicle identification means for identifying the type of the vehicle from the vehicle identification information separated and extracted by the separation and extraction means; parameter storage means for storing in advance characteristic parameters corresponding to each type of the vehicle; An on-vehicle electronic device comprising: control means for reading characteristic parameters corresponding to the identification result of the vehicle identification means from storage means and setting characteristic specifications. 6. The on-vehicle electronic device according to claim 5, wherein the in-vehicle electric wiring is an accessory power supply wiring. 7. The on-vehicle electronic device according to claim 5, wherein the in-vehicle electric wiring is a speaker wiring. 8. The on-vehicle electronic device according to claim 5, wherein the vehicle identification information generating means generates the vehicle identification information only within a predetermined time immediately after the accessory power is supplied. 9. The on-vehicle electronic device according to claim 8, wherein the in-vehicle electric wiring is a remote control signal wiring. 10. A vehicle identification wiring for setting vehicle identification information for identifying a type of a vehicle by a value of an electric impedance between them, and an impedance analyzing means for analyzing an electric impedance between said vehicle identification wirings. Vehicle identification means for identifying the type of the vehicle based on the analysis result of the impedance analysis means; parameter storage means for storing in advance characteristic parameters corresponding to each of the vehicle types; and the parameter storage means A control unit for reading characteristic parameters corresponding to the identification result of the vehicle identification unit and setting characteristic specifications. 11. The on-vehicle electronic device according to claim 10, wherein said impedance analysis means is means for analyzing whether said vehicle identification wiring is open or short-circuited. 12. A resonance circuit element in which different resonance frequencies are set corresponding to the type of the vehicle as an electrical impedance for setting vehicle identification information for identifying the type of the vehicle. The in-vehicle electronic device according to claim 10, wherein the in-vehicle electronic device is connected between wirings, and the impedance analysis unit detects resonance of the resonance circuit element. 13. A vehicle identification means for identifying the type of a vehicle based on vehicle identification information set corresponding to the type of vehicle, and a display pattern of a two-dimensional display device corresponding to each type of the vehicle. A parameter storage unit that stores in advance a characteristic parameter for changing the parameter, and reads a characteristic parameter corresponding to the identification result of the vehicle identification unit from the parameter storage unit to set a display pattern of the two-dimensional display device. An in-vehicle electronic device comprising: 14. A vehicle identification means for identifying the type of a vehicle based on vehicle identification information set corresponding to the type of vehicle, and calculating a travel distance from a vehicle speed corresponding to each type of the vehicle. Parameter storage means for storing characteristic parameters in advance, and the characteristic parameters read from the parameter storage means corresponding to the identification result of the vehicle identification means and the output of a vehicle speed sensor of the vehicle. A vehicle-mounted electronic device comprising: a traveling distance estimating unit that estimates a traveling distance of a vehicle.