CN108366316B - Technical method for realizing Dolby panoramic sound standard - Google Patents

Abstract

The invention discloses a technical method for realizing Dolby panoramic sound standard, which can ensure the optimization of structural parts by referring to the axial direction because a front panel or a reasonable front cavity of a loudspeaker has amplification effect (such as a high-pitch amplifier, a professional horn and the like) on sound, namely, the structure has optimal influence on the sound, the smaller the opening of a sound cup is, the more definite the directivity is, but the smaller the opening is, the more the axial frequency response curve is influenced, so that a balance point needs to be found between the sound cup and the sound cup to meet the Dolby directivity requirement, and the position which does not meet the requirement in the sound cup needs to be found according to the Dolby directivity requirement to meet the Dolby directivity requirement, thereby facilitating the modification and the adjustment of the sound cup, and further achieving the aim by the test method.

Description

A technical method to meet Dolby Atmos standard realization

technical field

The invention relates to a technical method for collocation and adjustment of loudspeakers, in particular to a technical method for satisfying the standard of Dolby sound directivity.

Background technique

As we all know, within the effective frequency range that the human ear can perceive, the directivity of high frequencies is strong (changes greatly with the angle), while the directivity of low frequencies is weak;

The design requirements: select the appropriate speaker, and carry out the division of frequency areas: the mid-range speaker is responsible for the intermediate frequency area, and the tweeter is responsible for the high-frequency area.

The focus of this design is on the high-frequency area, and the design focus of the high-frequency area is on the structural part that affects the high frequency to ensure that the directivity of the high frequency is not changed randomly, but changes to meet the requirements of Dolby.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides a technical method for realizing Dolby panoramic sound standard.

The technical solution adopted by the present invention to solve its technical problems is:

A kind of technical method that satisfies Dolby Atmos standard realization, it is characterized in that: comprise the following steps:

design method

1. Prepare the test horn and test device, and arrange the test horn and test device according to the predetermined position and angle, and test the attenuation value of the forward axial response frequency and the attenuation value of the rear axial response frequency of the test horn. The test ranges of the axial response frequency and the backward axial response frequency are: 1.5K-20K Hz,

2. Within the test range, compare the attenuation value of the forward axial response frequency with the attenuation value of the forward axial response frequency required by the Dolby standard; compare the attenuation value of the backward axial response frequency with the Dolby index The attenuation value of the backward axial response frequency is compared. The above comparison is made when the frequency values of the two are the same.

If the attenuation value of a certain response frequency above is greater than the attenuation value required by the Dolby standard, the D value is calculated by the following formula 1,

If the attenuation value of the response frequency in a certain range above is greater than the attenuation value required by the Dolby standard, then calculate the D value according to the following formula two:

f1 and f2 are the lower limit and upper limit of the response frequency;

λ is the wavelength, n is an integer, f is the frequency, c is the propagation speed of sound in the air,

The calculated D value represents the diameter of the sound cup of the test speaker, we find the position of the diameter on the sound cup, and then make adjustments.

The adjustment method is as follows: adjust the position height of the sound cup wall with a diameter of D value to a height H, the value of H is the same as D value, and H represents the distance from the bottom of the sound cup to the sound cup wall. vertical height.

The beneficial effects of the present invention are: referring to the axial direction, because the front panel of the horn or a reasonable front cavity has an amplifying effect on the sound (such as a treble amplifier, a professional horn, etc.), the optimization of the structural parts is ensured, that is, the structure has the greatest impact on the sound. Optimization, the smaller the opening of the sound cup, the clearer the directivity, but the smaller the opening, the more it will affect the axial frequency response curve, so we need to find a balance between the two to meet the requirements of Dolby directivity. Compared with the directivity requirements, we need to find the position in the sound cup that does not meet the requirements according to the Dolby directivity requirements, so as to facilitate our modification and adjustment. Therefore, the above purpose can be achieved through this test method.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a curve diagram of the attenuation change of the forward axial response frequency required by the Dolby standard;

Figure 2 is a graph of the attenuation change curve of the rearward axial response frequency required by the Dolby standard;

Fig. 3 is the curve diagram of the attenuation change of the measured response frequency;

Fig. 4 is a schematic diagram of the size identification of the sound cup.

Detailed ways

With reference to Fig. 1 to Fig. 4, the present invention discloses a kind of technical method that satisfies Dolby Atmos standard realization, comprises the following steps:

1. Prepare the test horn and test device, and arrange the test horn and test device according to the predetermined position and angle, and test the attenuation value of the forward axial response frequency and the attenuation value of the rear axial response frequency of the test horn. The test ranges of the axial response frequency and the backward axial response frequency are both: 1.5K-20K Hz. In this step, the test device and the predetermined position and angle are set according to Dolby’s requirements, so the specific process and device do not elaborate

2. Within the test range, compare the attenuation value of the forward axial response frequency with the attenuation value of the forward axial response frequency required by the Dolby standard; compare the attenuation value of the backward axial response frequency with the Dolby index The attenuation value of the backward axial response frequency is compared. The above comparison is made when the frequency values of the two are the same.

If the attenuation value of a certain response frequency above is greater than the attenuation value required by the Dolby standard, the D value is calculated by the following formula 1,

If the attenuation value of the response frequency in a certain range above is greater than the attenuation value required by the Dolby standard, then calculate the D value according to the following formula two:

f1 and f2 are the lower limit and upper limit of the response frequency in a certain range;

λ is the wavelength, n is an integer multiple of 1/4 wavelength, f is the frequency, c is the speed of sound in the air,

The calculated D value represents the diameter of the sound cup of the test speaker, we find the position of the diameter on the sound cup, and then make adjustments.

As shown in Figure 3, the attenuation values of the two frequency ranges f1 and f2; f3 and f4 in Figure 3 are greater than the attenuation value required by the Dolby standard, then we need to calculate the D value according to formula 2, and then find this D The position of the value is adjusted according to the following method: adjust the position height of the part with a diameter of D on the sound cup wall to the height H, and ensure that the surface of the sound cup wall is continuous and smooth. The value of H is the same as D The values are the same, and H represents the vertical height from the bottom of the sound cup to somewhere on the wall of the sound cup. Thereby, the optimization of the sound cup is completed, that is, the influence of the sound cup on the sound is optimized.

The technical method provided by the embodiment of the present invention that satisfies the Dolby Atmos standard has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The above embodiments The description is only used to help understand the method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary , the contents of this specification should not be construed as limiting the present invention.

Claims (1)

1. a kind of technical method for meeting Doby panorama sound standard implementation, it is characterised in that: the following steps are included:

One, test horn and test device are got out, and set test horn and test device according to scheduled position and angle, Test out the pad value of the forward direction axial response frequency of test horn and the pad value of backward axial response frequency, it is preceding in the axial direction The test scope of response frequency and backward axial response frequency is equal are as follows: and 1.5K-20K hertz,

Two, in test scope, by the forward direction axial response frequency of the preceding pad value to axial response frequency and Doby standard requirements The pad value of rate compares；By declining for the rear pad value to axial response frequency and the backward axial response frequency of Doby index Depreciation compares, and above-mentioned comparison is to take to compare in the identical situation of the two frequency values,

If the pad value of above-mentioned a certain response frequency is greater than the pad value of Doby standard requirements, following formula one calculates D value,

If the pad value of the response frequency in above-mentioned a certain range is all larger than the pad value of Doby standard requirements, according to following public Formula two calculates D value:

F1 and f2 is in response to the lower and upper limit of frequency；

λ is wavelength, and n round numbers, f is frequency, and c is the aerial spread speed of sound,

Calculated D value represents the diameter in the sound cup somewhere of test horn, we find position of the diameter on sound cup, then It adjusts,

The method of adjustment are as follows: the position height of part that diameter on sound wall of cup is D value is adjusted to height H at, the value of the H and D value is identical, and H is represented from sound bottom of a cup portion to the vertical height of certain of sound wall of cup.