JPS63177698A - Vehicle acoustic equipment controller - Google Patents

Abstract

PURPOSE:To remove the trouble of an adjusting operation and to improve the safety of driving by making an equalizer act automatically so that the output signal from a selected audio source comes to be a frequency characteristic for the audio source. CONSTITUTION:A change-over switch 7 selects an optional signal from plural signal sources. The equalizer 9 gives the prescribed frequency characteristic to the signal outputted from a sound volume 8 to adjust the largeness of the selected signal. The output signal from the equalizer 9 and a bit of selected source information from the switch 7 are inputted to a control unit 10. When the frequency characteristic and the sound volume of this output signal do not correspond to the audio source decided from the selected source information, the unit 10 reads out a frequency characteristic pattern signal and a sound volume changing signal corresponding to the audio source from a memory 11 and transmits them to actuators 12, 13. Accordingly, a driver need not adjust the equalizer at every switching of the switch 7.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a vehicle sound control device that controls the frequency characteristics of audio equipment installed in an automobile. This is related to an equalizer control device that controls the frequency characteristics of the equalizer.

(Prior Art) Traditionally, most in-vehicle audio equipment has been FM/AM radios and car stereos (C cassettes).
In recent years, in addition to in-vehicle televisions, compact disc players,
New media instruments such as digital audio technology are being developed one after another, and many sound! ! ! Attempts have been made to make the equipment into a total system and provide output through intermediate output systems (amplifiers, speakers, etc.).

However, because the required playback volume level, frequency characteristics, degree of harmonic distortion, and dynamic range vary depending on the type of signal from the input audio source (audio equipment), it is difficult to output signals from all audio equipment at the same level. If the output characteristics are used, the unique characteristics of the audio source may not be fully utilized, or it may become difficult to hear. For example, a case will be explained in which the audio source is switched to a radio baseball broadcast while listening to a compact disc. The output signal from the compact disc covers the entire audible frequency range (approximately 20H2 to approximately 20KH2).
> has a flat frequency response, clear distortion-free,
It has the features of being able to obtain high quality sound, having a high S/N ratio, and having a wide dynamic range.

In the case of sounds similar to natural sounds obtained by reproducing such output signals, it is said that humans do not feel that there is much volume in H, and furthermore, they perceive low-frequency sounds as unpleasant.

Therefore, when listening to a compact disc, it is recommended to use an equalizer to significantly boost the low range of the playback output signal, and slightly raise the high range as well, thereby increasing the overall volume. However, when setting the frequency response in this way,
When I switch to a baseball broadcast on the radio, I can only hear the sound of Taiko from the cheering squad, and it becomes very difficult to hear Anaranza's voice.

Baseball broadcasts on AM radio are generally easier to listen to by cutting off the low and high frequencies, so in the case described above, you may want to re-set the equalizer to lower the high range and reduction of the output signal from the radio and raise the midrange. Just make adjustments.

(Problem to be Solved by the Invention) However, in the case of in-vehicle audio equipment, it is extremely dangerous for the driver to readjust the equalizer every time the driver changes the audio source because it takes his eyes off the road ahead. , there were problems such as it being cumbersome to readjust after returning to the parent's audio source. Furthermore, Japanese Utility Model Application No. 58-30319 discloses an automatic equalizer device for a car stereo. This device causes a calibration microphone to receive a tone from a tuned calibration oscillator, and an electrical signal from the microphone automatically calibrates the equalizer to a desired characteristic state suitable for the audio source. The frequency characteristics of the output signal are adjusted. However, even in such a device, the calibration oscillator must be adjusted or switched depending on the type of audio source, which poses problems in terms of operational safety and inconvenience.

The present invention has been made to solve such problems, and when switching to a different audio source in a vehicle, it improves driving safety when the equalizer is readjusted to a state suitable for that audio source. It is an object of the present invention to provide a vehicle audio equipment control device that can ensure performance and eliminate the troublesome adjustment operations.

(Means for Solving the Problems) The vehicle river sound WTA control device of the present invention selects an arbitrary audio source from a plurality of audio sources using an audio source selection means, and selects each of the plurality of audio sources in advance. A frequency characteristic corresponding to the selected audio source is read out from the frequency characteristic storing means storing a frequency characteristic corresponding to the selected audio source, and the output signal from the selected audio source is automatically read out from the frequency characteristic storage means. The present invention is characterized in that the equalizer is operated using a frequency characteristic changing means so that the frequency characteristic becomes the specified frequency characteristic.

Here, the audio source refers to an audio device that extracts a playback signal from a carrier wave or signal software such as a CD, such as an AM
Receiver, FM receiver, car stereo, TV, DAD
It includes players (including CDs), DAT decks, video disk players, etc., as well as all devices that emit audio through speakers, such as telephones and personal wireless devices.

Moreover, "vehicle audio equipment" means one of the above-mentioned audio equipment that is generally arranged in the vehicle interior (including the trunk room, etc.) of an automobile.

In addition, [audio source selection means] refers to multiple audio 9m
A selector switch for sending the output signal from any sound WtlI device to an output system such as an amplifier or speaker, or operating power to any sound g device among multiple sound R devices. Refers to a changeover switch, etc. that supplies

In addition, [frequency characteristic storage means] generally refers to ROM, RA
Refers to storage memory such as M.

Furthermore, "frequency characteristic successive generation means J inputs a signal corresponding to a desired audio source to the frequency characteristic storage means, and outputs a signal representing a frequency characteristic corresponding to this audio source from this frequency characteristic storage means. The means is, for example, an audio source changeover switch or a microprocessor (CPLI) capable of outputting an electrical signal representing the type of the selected audio source to the frequency characteristic storage means.

Further, "frequency characteristic changing means" is a means for operating so as to change the gain of each signal separated for each frequency band by an equalizer, and refers to, for example, a 7-channel cutter, a microprocessor (CPU), etc.

Note that the above system may be formed by analog circuits or digital circuits (including microcomputer circuits).
It may be formed by

The above-mentioned "equalizer" includes not only a so-called equalizer that is configured in hardware with multiple filters and multiple gain variable means, but also an arithmetic processor that adjusts the gain of each signal separated into each frequency band using software. shall also be included.

(Effect of the invention) According to the vehicle audio equipment f and IJIil device of the present invention,
When making the output signal from an audio source have a frequency characteristic suitable for that audio source, select one of a plurality of frequency characteristics that have been patterned and stored in advance.
The pattern of frequency characteristics corresponding to the selected audio source is read out, and the gain of the equalizer is adjusted so that the output signal from the selected audio source automatically has the read frequency characteristics. can operate the equalizer. Therefore, the driver does not need to readjust the equalizer to match the A-dio source every time the audio source is switched, ensuring driving safety and freeing the driver from the hassle of readjusting the equalizer. can do.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the device of the invention in one block view. In this embodiment, an AM radio signal received by an AM antenna 1 and outputted from an AM receiver 1a, an FM antenna 2
FM radio signal received by and output from FM reception@2a, signal output from cassette tape deck 3, signal output from compact disc player 174, signal received by car phone antenna 5 and output from car phone. 5a and the television antenna 6 and output from the television receiver 6a, the signal is selected from the signal source <
The equalizer and volume are automatically adjusted to have a predetermined frequency characteristic and volume suitable for the audio source (audio source), and the signal given this frequency characteristic is sent to the output system. . In other words, this embodiment includes a source selector switch 7 as audio source selection means for selecting an arbitrary signal from output signals from a plurality of signal sources as described above, and adjusting the magnitude of the selected signal. An equalizer 91 gives predetermined frequency characteristics to the signals output from the sound R volume 8 and the nm volume 8, and the output signal from the equalizer 9 and selected source information from the source selection switch 7 are input, and the frequency characteristics and the frequency characteristics of this output signal are inputted. If the volume does not correspond to the audio source determined from the selected source information, frequency characteristic reading means reads out the frequency characteristic pattern signal and M11 change signal corresponding to this audio source from the memory 11 and sends it to the actuator 12.13. The control unit 10 as a controller stores a plurality of frequency characteristic patterns and volume information,
A memory 11 serves as a frequency characteristic storage means for transmitting a predetermined frequency characteristic pattern and sound m information to the control unit 10 based on a read signal from the control unit 10; Based on the volume change signal from the control unit 10 and the actuator 12 as a frequency characteristic changing means that readjusts and activates the equalizer 9 so as to give the frequency characteristic corresponding to the signal input to the signal, the volume volume is adjusted. The device is equipped with an actuator 13 that adjusts the volume 8 so that the signal input to the volume 8 has a predetermined amplitude. Further, the signal outputted from the control unit 10 to the output system is inputted to the main amplifier 14 and amplified, and then outputted as sound from the front speaker 15a and the rear speaker 15b. In addition,
When all signal processing within the control unit 10 is digital signal processing, the signal from the equalizer 9 is converted into a digital signal by an A/D converter 16 in the preceding stage of the control unit 10tl, as shown in FIG. It is necessary to connect the D/A converter 11 between the control unit 10b and the main amplifier 14 to convert the output signal from the control unit 10b into an analog signal. In the above embodiment, the selected sound information from the source changeover switch 7 is input to the control unit 10, but this selected sound information is input directly to the memory 11 as a readout signal of frequency characteristic pattern and volume information. In this case, the source changeover switch 7 becomes the frequency characteristic reading means.

It is also convenient to provide a memory switch in the control unit 10 so that when the switch is pressed, the memory 11 can be manually rewritten.

FIG. 3 is a block diagram showing a portion of a second embodiment of the apparatus of the present invention. In other words, this embodiment emphasizes multifunctionality through digital signal processing using a microcomputer, and an interface 21 (digital signal (in the case of input) or the A/D converter 22 (in the case of analog signal input), the data bus 23 that transmits the input signal, the input signal is input from the data bus 23, and the input signal is given the frequency characteristics corresponding to this input signal. an arithmetic processor 24 that performs signal @ calculation to adjust the input signal to a predetermined volume so as to have a predetermined volume; Interface 25 (for digital signal output) or D/
The A converter 26 (in the case of analog signal output) receives an input signal from the data bus 23 and temporarily stores the input signal (RAM 27, arithmetic processor 24 and CP
The calculation information signal and control signal for the LJ 29 to perform calculation and control, as well as the frequency characteristic pattern signal and volume information signal corresponding to the input signal, are sent to the calculation processor 24.
A control bus 28 for transmitting signals to the processor 24, a CPU 29 that controls the processor so that the processor 24 performs predetermined calculations, and a CPU 29 that stores a plurality of frequency characteristic patterns and syllable information. A memory 30 outputs a predetermined frequency pattern and volume information to the arithmetic processor 24 based on the information, and an ALLI 31, a ROM 32, and a RAM 33 that contribute to controlling the arithmetic processor 24, the CPU 29, and information signals. Note that a display 34 and an operation panel 35 are connected to the control bus 28 to facilitate adjustment operations by the driver and the like. In this embodiment, the arithmetic processor 24 plays the role of the equalizer 9 similar to the first embodiment, and C P tJ
29 serves as frequency characteristic reading means and frequency characteristic changing means.

In addition, in the two embodiments described above, in addition to adjusting the frequency characteristics, the volume can also be adjusted automatically.
Frequency characteristics 1! It may be configured so that only the adjustment is performed.

Furthermore, a configuration may be adopted in which the elimination of harmonic distortion, expansion of the dynamic range, etc. can be automatically adjusted in accordance with the music source.

[Brief explanation of the drawing]

Fig. 1 is a block diagram, not showing a first embodiment of the vehicle Kawano W-machine 3 control device according to the present invention, Fig. 2 is a block diagram for explaining a part of Fig. 1 in detail, and Fig. 3 FIG. 2 is a block diagram showing a second embodiment of the vehicle audio equipment 1tIII III device according to the present invention. 7.7b... Source selection switch (audio source selection means) 8... Volume volume 9... Equalizer 10, 10b... Control unit (frequency characteristic reading means) 11, 11b, 30... Memory ( Frequency characteristic storage means) 12, 13... Actuator (frequency characteristic changing means) 24... Arithmetic processor 29... CPU (Frequency characteristic successive output means 1 frequency characteristic changing means) Fig. 2 1h Fig. 3

Claims (1)

[Scope of Claims] A vehicle audio equipment control device comprising an equalizer, comprising: audio source selection means for selecting an arbitrary audio source from a plurality of audio sources; and a frequency corresponding to each of the plurality of audio sources. a frequency characteristic storage means for storing characteristics; a frequency characteristic reading means for reading out a frequency characteristic corresponding to the audio source selected by the audio source selection means from the frequency characteristic storage means; and an output signal from the selected audio source. and a frequency characteristic changing means for operating the equalizer so that the frequency characteristic read by the frequency characteristic reading means becomes the same as the frequency characteristic read by the frequency characteristic reading means.