JPS63175599A - Stereo reproducing device - Google Patents

Abstract

PURPOSE:To obtain the best sound field characteristics in any riding state by using an output of a sensor including the information of the riding state to operate an operation part via a transducer and operating the regulating function of an amplifier automatically. CONSTITUTION:The titled device consists of an amplifier 1 having functions regulating the frequency characteristics to adjust in-room sound field characteristics, a speaker 5 connected to the amplifier 1, plural sensors 2 detecting the number of listeners and listening position, a transducer 3 transducing the output of the sensors 2 to a signal suitable for the operation of the regulating function, and an operation section 4 receiving the output signal of the transducer 3 and operating the regulating functions. The frequency characteristic of the amplifier 1 is set to the best state in the cabin in advance and the deterioration in the in-cabin sound field characteristics due to the presence of listeners is adjusted automatically in the best state in response to the number of listeners and the listening position. Thus, the in-cabin sound field condition is recognized and the required compensation is applied, then the in-cabin sound field characteristic is brought always into the best state.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a stereo playback device in the field of electroacoustic equipment, and in particular, to a stereo playback device for a car, which can produce the best sound field in any riding condition. The present invention relates to a stereo playback device that can automatically adjust sound field characteristics by detecting the number of occupants and their riding positions so as to obtain characteristics.

[Prior Art] Traditionally, the sound field characteristics inside a car using an in-vehicle stereo playback device are shown in Fig. 5 as solid lines (when the car is empty) and dotted lines (when the car is empty) and when there is one person in the passenger seat. It has been known that the sound field characteristics at the driver's seat change and the sound quality deteriorates, as shown in (2013).However, in conventional car stereo playback devices, characteristic correction in such cases can be done using tone controls or graphic equalizers. Generally, this is done manually, and some models have a system in which the characteristics are corrected by manually changing a switch for a limited area, such as the driver's seat or passenger seat. There was something.

[Problem to be solved] Conventional sound field characteristic correction methods with such a structure switch to preset characteristics for a limited location as described above, regardless of the number of passengers or the riding condition. However, the sound field characteristics were not finely adjusted according to the riding condition, and the system was not fully satisfactory.

In addition, with manual methods using tone controls or graphic equalizers, it is impossible to finely adjust the sound field characteristics on the spot depending on the number of passengers without a measuring device, and it is impossible to adjust the sound field characteristics while driving. It had the disadvantage of being too careful with adjustments, which could sometimes be dangerous.

[Means for Solving the Problems] A stereo reproduction device according to the present invention for solving the drawbacks of the conventional example described above will be explained using FIG. 1 showing the basic configuration. An amplifier 1 having a frequency characteristic adjustment function to adjust field characteristics, a speaker 5 connected to the amplifier 1, a plurality of sensors 2 for detecting the number of listeners and listening positions, and the output of the sensor 2. It consists of a converter 3 that converts the signal into a signal suitable for operating the adjustment function, and an operation section 4 that receives the output signal of the converter 3 and operates the adjustment function. This stereo playback device is characterized in that it automatically adjusts the deterioration of indoor sound field characteristics caused by the presence of listeners to the best condition according to the number of listeners and the listening position. .

In the in-vehicle sound field characteristic automatic adjustment device configured as described above, the sensor 2 installed on each seat detects the occupants and their riding position, and calculates the predicted value for each riding condition. The output of the sensor 2, which includes information on the riding condition, is transmitted through the converter 3 to operate the operation unit 4 so that the deterioration of the sound field characteristics becomes the preset best sound field characteristics. The operating section 4 can automatically operate and compensate the frequency characteristic adjustment function of the amplifier 1.

[Embodiment] FIG. 1 is a diagram showing the basic configuration of the present invention, which includes a program source 12 such as a tape deck or tuner, and a program source 12 that is mechanically or electronically operated by an operating section 4 to guarantee sound field characteristics. an amplifier 1 having a function of changing the frequency characteristics by changing the frequency characteristics; a speaker 5 connected to the amplifier 1; and an operation unit 4 that operates the frequency characteristics adjustment function of the amplifier 1;
Sensors 2 are installed in the driver's seat 13, passenger seat 14, and rear seat 15, respectively, and the outputs of the sensors 2 are transmitted to the operating section 4.
The converter 3 converts the signal into a signal compatible with the configuration. Two types of embodiments will be described in detail below as representative examples.

Embodiment 1: The amplifier 1 of this embodiment incorporates a graphic equalizer as a frequency characteristic adjustment function, and its main circuit has the structure shown in FIG. 2, and its output voltage eO
varies continuously between the A characteristic and the B characteristic shown in the frequency characteristic diagram of FIG. 3, including the flat characteristic C serving as the boundary, depending on the position of the variable resistor VR.

As the sensor 2, a strain gauge mainly made of piezoelectric ceramic is used as a pressure sensitive element.
The output passes through a converter consisting of a servo amplifier 8 and drives a servo mechanism 9 directly connected to the variable resistor VR of the graphic equalizer. 8KHz is decreasing
The sound field characteristics will be compensated by increasing the level in the range of ~15 KHz.

The strain meter used as sensor 2 in this embodiment is capable of detecting not only the presence or absence of a human body on the seat but also the size of the human body based on its weight, and finely correcting the influence of the human body on the sound field characteristics. It is possible.

Furthermore, by using bridge T circuits (not shown) for the impedances Zl and Z2 in FIG. 2, it is possible to obtain more complex characteristics, and it is possible to perform compensation more precisely adapted to the sound field characteristics in the vehicle interior.

Embodiment 2: In this embodiment, as shown in FIG. 4, an optical sensor including a light emitting element 6 and a light receiving element 7 is used as a sensor, and furthermore, a graphic equalizer is of a digital type,
The output of the optical sensor is converted into a digital signal by an A/D converter 10, and a processor 11 directly controls a digital graphic equalizer.

The light emitting element 6 and the light receiving element 7 of the optical sensor in this embodiment.
A/D converter 10. Processor 11. Digital graphic equalizers and the like can be used as they are with conventionally commonly used structures.

This embodiment not only has excellent durability since there are no mechanical parts, but also utilizes the memory of the microprocessor 11 to adjust the frequency characteristics of the amplifier 10 to provide the best sound field characteristics for the desired speaker arrangement as an option. The feature is that it is very easy to automatically adjust changes in the sound field characteristics caused by the occupant using the frequency characteristics as a reference.

The stereo reproduction device according to the present invention has been described in detail above based on a typical embodiment, but the structure according to the present invention is not limited to the structure of the above embodiment, and can be applied to, for example, the main channel in surround stereo. At the same time, it is easy to apply it to a sound effect channel in addition to the main channel, and it is within the technical scope of the present invention.

In addition, individual components such as the structure of the sensor, the installation location, the tone control, the frequency characteristic adjustment function of the amplifier such as the graphic equalizer, etc., have the constituent requirements according to the present invention and have the functions according to the present invention, As long as the effects described below are obtained, it may be carried out with appropriate modifications.

Furthermore, the technical idea of the present invention can be applied not only to a stereo for a car but also to a membrane room.

[Effects] The stereo reproduction device according to the present invention described above has the following advantages compared to the conventional structure.

(1) The sound field conditions inside the car are known by detecting not only the number of occupants and the riding position, but also the physique of the passengers, and necessary compensation is made, so the sound field characteristics inside the car can always be kept in the best condition.

(2) Since the above-mentioned operation for compensation is performed automatically, it is not complicated at all, and there is no need to be distracted by the operation, so there is no danger even while driving.

Due to the above-mentioned advantages, it is possible to raise the quality of the reproduced sound of car stereos, which are becoming more and more sophisticated with each passing year, and to fully meet the demands of the increasingly individualized market.

The figure is a configuration diagram of an example of the graphic equalizer of the first embodiment, FIG. 3 is an explanatory diagram of the same frequency characteristics, FIG. 4 is a configuration diagram of the second embodiment, and FIG. 5 is a frequency characteristic showing an example of the in-vehicle sound field characteristics. It is a diagram.

1 is an amplifier, 2 is a sensor, 3 is a converter, 4 is an operation unit, 5
1 is a speaker, 6 is a light emitting element, 7 is a light receiving element, 8 is an amplifier, 9 is a servo mechanism, 10 is an A/D converter, and 11 is a processor.

Patent applicant: Onkyo Corporation Figure 1

Claims (1)

[Claims] 1. An amplifier (1) having a frequency characteristic adjustment function to adjust the indoor sound field characteristics, a speaker (5) connected to the amplifier 1, and the number of listeners and listening positions. a plurality of sensors (2) for detection, a converter (3) for converting the output of the sensor (2) into a signal suitable for operating the adjustment function, and a converter (3) for receiving the output signal of the converter (3); It consists of an operation unit (4) that operates the adjustment function, and sets the frequency characteristics of the amplifier (1) to the best condition in the room in advance, and listens for deterioration of the indoor sound field characteristics due to the presence of a listener. A stereo playback device that automatically adjusts to the best condition depending on the number of listeners and the listening position. 2. The stereo reproduction device according to claim 1, wherein the sensor is a strain meter including a pressure-sensitive element embedded in the sheet. 3. The stereo reproduction device according to claim 1, wherein the sensor is an optical sensor including a light emitting element (6) and a light receiving element (7). 4. The stereo reproduction device according to claim 1, wherein the converter and the operating section are a servo amplifier (8) and a servo mechanism (9) coupled to a sensor (2). 5. The converter includes an A/D converter (10) and a processor (
11) and a section having a function of adjusting the frequency characteristics of the amplifier (1) is of a digital type and is directly controlled by the output of the processor (11). The stereo playback device described. 6. The stereo playback device is of a surround type,
The sound effect channel as well as the main channel has an amplifier having a volume and frequency characteristic adjustment function, and converts the plurality of sensors (2) and the output of the sensor (2) into a signal suitable for operating the adjustment function. A converter (3) that performs the conversion, and an operation unit (4) that receives the output signal of the converter (3) and operates the adjustment function, make it possible to adjust the sound effect based on the presence of the listener as well as the main playback sound. 2. The stereo playback device according to claim 1, wherein the deterioration of indoor sound field characteristics caused by the sound is automatically adjusted to the best condition according to the number of listeners and the listening position.