JPH0619275Y2 - Automotive audio equipment - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a vehicle-mounted audio device, and in particular, a vehicle-mounted audio device using a graphic equalizer for correcting acoustic characteristics in a vehicle compartment on the front side and the rear side. Regarding

<Prior Art> Conventionally, as shown in FIG. 2, an audio signal is output from a cassette deck 1 serving as a sound source, and is equalized in accordance with the operation of the operation unit 2 in the graphic equalizer 2, the front amplifier 4 and the rear amplifier. The sound is amplified by 6 and reproduced by the front speaker 5 and the rear speaker 7, respectively. However, when the front and rear speakers are leveled at the same time in the vehicle interior, the acoustic characteristics are always peak and dip due to the relationship of standing waves. The frequency band in which the peak occurs in the graphic equalizer suppresses the level, and the band in which the dip occurs boosts the level, resulting in a flat characteristic with one graphic equalizer.
The front and rear sides were corrected at the same time.

<Problems to be solved by the invention> However, in such a conventional graphic equalizer, for example, a small speaker that does not have a desired bass sound on the front side and a bass sound on the rear side considerably appears. When making sound with a large speaker, peaks and dips occur in the acoustic characteristics. To make that correction,
In the graphic equalizer, the low range is 200-300Hz,
The high range is adjusted from 2K to 3KHz respectively, but at that time, the rear speaker can be corrected by adjusting the low range, but at the same time, the low range of the front speaker which does not have the low range is also lifted and the feeling of distortion appears. In the high range adjustment, the front and rear speakers can be corrected, but in reality the front side loses the volume of the large-diameter rear speaker, which causes a problem that the sound field shifts to the rear and becomes noisy.

An object of the present invention is to divide the graphic equalizer into a front speaker and a rear speaker, and naturally consider the balance between the acoustic characteristics of the front speaker and the rear speaker to naturally correct the sound field.

<Means for Solving Problems> In order to solve the above problems, the present invention has first and second equalizer units for correcting frequency characteristics in a predetermined voice band for each of a plurality of frequency bands. A vehicle-mounted audio device that outputs an audio signal from the front speaker via the first equalizer section and from the rear speaker via the second equalizer section, and an audio band that can be corrected by the first equalizer section. Is set to be higher than the high frequency band, and the voice band that can be corrected by the second equalizer unit is set to be shifted from the low frequency band so that some high frequencies and low frequencies do not overlap each other.

<Operation> The above technical means operates as follows.

A sound field correction device is provided on each of the front speaker side and the rear speaker side, and the frequency bandwidth of the frequency band of the equalizer section is divided into a higher frequency band and a lower frequency band, so that the frequency characteristics of the front speaker and the rear speaker can be improved. The difference can be handled well, and the peaks and dips that occur in the acoustic characteristics of the front speaker side and the rear speaker side can be finely corrected to make the acoustic characteristics flatter.

<Embodiment> An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention. 1 in the figure
Is a cassette that serves as a sound source, 8 and 10 are graphic equalizers, 9 and 11 are operating portions thereof, 4 is a front amplifier, 6 is a rear amplifier, 5 is a front speaker, and 7 is a rear speaker.

In Fig. 1, an audio signal is output from one cassette deck, which is a sound source, passes through each of the graphic equalizers of 8,10, is amplified by each of the amplifiers of 4,6, and is output as sound from the front and rear speakers of 5,7. Is played.

For the front speaker 5, a small full range with a diameter of 10 cm is normally used, and at that time, bass cannot be expected, but on the other hand, clearer middle and high frequencies are required.

For the rear speaker 7, a full range of 16 cm or more is usually used, and due to its large diameter, a rich and rich deep bass is required.

8 is a graphic equalizer on the front speaker side, and as an idea, 9 is a plurality of frequency bands within the voice band (400Hz, 800Hz, 1.25KHz, 2KHz,
2.5KHz, 3.2KHz, 6.4KHz, 12.5KHz, 16KHz) operation keys are provided to narrow the bandwidth around 2K to 3KHz where peaks and dips are most likely to occur in the middle and high frequencies of the frequency characteristics, and By shifting further, it is possible to create the transparent middle and high range without distortion that is originally required for front speakers by adjusting the operation keys, and it was difficult to adjust in the past 15KH
Among the percussion instruments that are affected by the frequency band above z, the reverberation of the cymbal sound can be achieved by setting the operation key near 15 KHz.

10 is a graphic equalizer on the rear speaker side,
As an idea, the operation unit 11 has a plurality of frequency bands within the voice band (63 Hz, 126 Hz, 160 Hz, 200 Hz, 250 Hz, 3 Hz).
20Hz, 500Hz, 640Hz, 1KHz) operation keys are provided, and peaks and dips have the greatest effect in the low frequency range.
By narrowing the bandwidth around 0 to 300Hz, it is possible to create a heavy bass sound without distortion that is originally required for rear speakers by adjusting the operation keys.

When a total of four speakers, that is, the left and right front speakers 5 and the left and right rear speakers 7, are used at the same time, the front speaker 5 is the front speaker side graphic equalizer 8
Then, the rear speaker 7 is corrected by the rear speaker-side graphic equalizer 10 so that the sound field shifts to the rear speaker side due to the difference in the aperture of the front and rear speakers and the difference in frequency characteristics, for example, when the volume is conventionally large. It is possible to deal with the influence of being lost, and the most preferable sound field correction can be performed by the listener's own hearing feeling.

<Effects of the Invention> As described above, according to the present invention, by providing a dedicated graphic equalizer on the front speaker side and the rear speaker side, the front speaker arranged in the vehicle compartment,
It is possible to cope with the difference in aperture / frequency characteristics of the rear speaker and the sound propagation characteristic depending on the mounting position, and the sound that is originally required for the front speaker side and the rear speaker side, that is, clear middle / treble sound for the front speaker, rear A rich deep bass can be obtained in the speaker, and the listener can easily correct the sound field according to his or her own preference for the sound, thereby creating a unique sound field.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional embodiment. In the figure, 1 is a cassette deck as a sound source, 4 is a front amplifier, 6 is a rear amplifier, 5 is a front speaker, 7
Is a rear speaker, 8 is a front speaker side graphic equalizer, 9 is an operating section, 10 is a rear speaker side graphic equalizer, and 11 is an operating section.

Claims (1)

[Scope of utility model registration request] 1. A first speaker and a second equalizer section for correcting frequency characteristics in a predetermined audio band for each of a plurality of frequency bands, and a front speaker and a second equalizer section through the first equalizer section. Is a vehicle-mounted audio device that outputs a sound signal from a rear speaker via the equalizer unit of the first equalizer unit, and the sound band that can be corrected by the first equalizer unit is
An in-vehicle audio device, wherein an audio band that can be corrected by the second equalizer unit is set so as to be offset from a low frequency so that a part of the high frequency and a low frequency do not overlap each other.