JPH0715272Y2 - Car audio system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vehicle-mounted audio device such as a car audio device.

[Conventional technology]

One of car audio devices installed in vehicles such as automobiles
As one, there is known one in which the volume changes according to the speed of the vehicle.

As shown in FIG. 3, this car audio device has a vehicle speed detection unit 1 for detecting a vehicle speed, an audio signal generation unit 2 for generating an audio signal, and a vehicle speed detection signal output by the vehicle speed detection unit 1. According to the volume control unit 3 for controlling the volume of the audio signal output from the audio signal generating unit 2, and the front audio signal and the rear audio signal based on the audio signal whose volume is adjusted by the volume control unit 3. A fader control section 4 for generating an audio signal and an amplifier 5 for amplifying a rear audio signal output from the fader control section 4
A rear speaker 7 for generating a sound corresponding to the rear audio signal amplified by the amplifier 5, an amplifier 6 for amplifying the front audio signal output from the fader control section 4, and the amplifier 6 And a front speaker 8 for generating a sound according to the front audio signal amplified by.

Then, when this vehicle is traveling at low speed, the volume is reduced, and when traveling at high speed,
Increase the volume to increase engine noise and road
The sound output from the rear speaker 7 or the front speaker 8 can be clearly heard even if noise or the like becomes large.

[Problems to be solved by the invention]

By the way, since such a conventional car audio device has only the function of automatically adjusting the volume according to the vehicle speed, when the type and function of the car are different or the road conditions are different, the rear speaker 7 And front speaker 8
Often the sound output from the sound was different from the original sound.

In view of the above circumstances, the present invention provides a vehicle-mounted acoustic device that can always ensure an appropriate listening state even when the type and performance of the vehicle are different, the road conditions are different, or the vehicle speed changes. It is intended to be provided.

[Means for solving problems]

In order to solve the above-mentioned problems, an in-vehicle audio device according to the present invention is an in-vehicle audio device mounted on a vehicle and provided with a front speaker and a rear speaker, and an audio signal generator for generating an audio signal. A vehicle speed detection unit that detects the speed of the vehicle; a storage unit that stores a plurality of equalizer characteristic data; and a volume adjustment signal that corresponds to a vehicle speed detection signal that is input from the vehicle speed detection unit and that is output from the storage unit. A control unit that selects and outputs equalizer characteristic data according to the vehicle speed detection signal, and an equalizer unit that controls the frequency characteristic of the audio signal input from the audio signal generation unit based on the equalizer characteristic data,
This is achieved by including a volume adjusting unit that adjusts the level of the audio signal input to the front speaker among the audio signals output from the equalizer unit based on the volume adjusting signal.

〔Example〕

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

The vehicle-mounted audio device shown in this figure includes an audio unit 10, a vehicle speed detection unit 11, and a control unit 12, and a rear speaker 21 according to the speed of the vehicle in which the vehicle-mounted audio device is mounted. And the sound quality of the sound output from the front speaker 22 is adjusted.

The audio section 10 includes an audio signal generation circuit 15 for generating an audio signal and an equalizer circuit 16 for adjusting the frequency characteristic of the audio signal output by the audio signal generation circuit 15 according to the equalizer characteristic data supplied to its control terminal. And a volume control circuit 17 for adjusting the size of the audio signal output from the equalizer circuit 16, and this volume control circuit 17
A fader control circuit 18 for generating a front audio signal and a rear audio signal from the output of
An amplifier 19 for amplifying the rear audio signal output from the fader control circuit 18 and a speed detection signal (a F / V converter 25 described later) supplied to its control terminal.
Gain adjustment amplifier 31 for adjusting the gain of the front audio signal output from the fader control circuit 18 in accordance with the magnitude of the output), and the gain adjustment amplifier 31.
And an amplifier 20 for amplifying the output of the rear audio signal amplified by the amplifiers 19 and 20, and
The front audio signal is supplied to the rear speaker 21 and the front speaker 22, respectively, and is output as a sound from each of the speakers 21 and 22.

Further, the vehicle speed detection unit 11 detects the speed of the vehicle in which this on-vehicle audio device is mounted, and a vehicle speed pulse generator 23 that generates a pulse signal at a repetition cycle corresponding to this speed, and this vehicle speed pulse generator 23. And a buffer 24 that amplifies the pulse signal output from the pulse signal generator. The pulse signal is generated at a speed according to the speed of the vehicle and is supplied to the control unit 12.

The control unit 12 voltage-discriminates the F / V converter 25 that performs F / V conversion (frequency / voltage conversion) of the pulse signal and the output (speed detection signal) of the F / V converter 25 to determine the voltage of the speed detection signal. A window / comparator 26 that generates speed detection data having a value corresponding to the value, an operation unit 29 that is operated when setting the equalizer characteristics, a display unit 30 that displays various data, and a vehicle speed / equalizer characteristic. A memory 28 storing a data conversion table and the like, and the vehicle speed /
Equipped with an equalizer characteristic control circuit 27 that calculates equalizer characteristic data corresponding to the vehicle speed detection data from the window comparator 26 while looking up the equalizer characteristic data conversion table, and is detected by the vehicle speed detection unit 11. The equalizer characteristic data corresponding to the vehicle speed is generated, and the equalizer characteristic data is generated by the audio unit 10.
Is supplied to the equalizer circuit 16 to adjust the equalizer characteristics of the equalizer circuit 16.

In this case, as the equalizer characteristic data output by the control unit 12, data having a flat characteristic as shown in FIG. 2 (A) in the low speed range is used, and at equal speed in FIG. 2 (B). As shown in, data of characteristics in which the low range and the high range are slightly raised is used.

Further, at high speed, as shown in FIG. 2 (C), data of characteristics in which the low range and the high range are further raised is used.

This makes it possible to emphasize the low-frequency part and the high-frequency part of the sound output from the rear speaker 21 and the front speaker 22 as the vehicle speed increases.

Further, as the vehicle speed becomes faster, the gain of the gain adjusting amplifier 31 correspondingly increases, so that the volume of the sound output from the front speaker 22 can be increased as the vehicle speed becomes faster.

As described above, in this embodiment, the equalizer characteristic corresponding to the vehicle speed is always obtained in consideration of the low frequency noise due to the vehicle engine noise, the road noise, etc., the high frequency noise due to the wind noise, etc. A proper listening condition can be secured.

In addition, since the equalizer characteristic data can be input from the operation unit 29 and stored in the memory 28 according to the vehicle type, road conditions, preferences, etc., it is optimal for the vehicle type, road conditions, preferences, etc. The sound quality can be improved.

Further, in this embodiment, since it is used in combination with the gain adjusting amplifier 31 (auto volume controller, etc.), the sound image can be localized on the front side at high speed, which allows the driver to operate. The sound image can be brought in the direction in which the attention of the person concentrates.

[Effect of device]

As described above, according to the present invention, the treble range and the bass range of the equalizer characteristic are automatically increased / decreased according to the traveling speed of the vehicle, regardless of the traveling speed such as stop, constant speed traveling, and variable speed traveling. , The sound quality of listening can be kept almost constant, and it is possible to solve the lack of high and constant range that becomes difficult to hear due to noise during driving, and at the time of high speed driving, the volume output from the front speaker is automatically Since the sound image can be localized on the front side where the driver's attention is concentrated, it is possible to provide an in-vehicle audio device that is easy to listen to without disturbing driving at high speed. That is, it has a practically remarkable effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an in-vehicle audio device according to the present invention, FIGS. 2 (A) to 2 (C) are schematic diagrams for explaining the same embodiment, and FIG. 3 is a conventional car. It is a block diagram which shows an example of an audio device. 11 …… Vehicle speed detection section, 15 …… Audio signal generation section (audio signal generation circuit), 16 …… Equalizer section (equalizer circuit), 27 …… Equalizer characteristic control section (equalizer characteristic control circuit).

Claims (1)

[Scope of utility model registration request] 1. An in-vehicle acoustic device mounted on a vehicle, comprising a front speaker and a rear speaker, comprising: an audio signal generating section for generating an audio signal; a vehicle speed detecting section for detecting a speed of the vehicle; A storage unit for storing the equalizer characteristic data, and a volume adjustment signal corresponding to the vehicle speed detection signal input from the vehicle speed detection unit, and the equalizer characteristic data corresponding to the vehicle speed detection signal selected from the storage unit and output Which controls the frequency characteristic of the audio signal input from the audio signal generating section based on the equalizer characteristic data, and the audio signal output from the equalizer section, which is input to the front speaker. And a volume adjusting section for adjusting the level of the audio signal based on the volume adjusting signal. Vehicle audio apparatus according to.