GB/T 33771-2017Sound system equipment -- Electro-acoustical transducers -- Measurement of suspension parts (English PDF)

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the re-drafting method to modify IEC 62459..2010 "sound system equipment electro-acoustic transducer suspension parts measurement".

The main technical differences between this standard and IEC 62459..2010 are as follows.

--- will 3.6,3.7 in the "note" were moved to the text of 3.6,3.7;

--- modify the contents of 3.11, the "f0 ~

2pi K (xoff) deltamS

"Modified to" f0 ~

2pi C (xoff) delta mS

"(See 3.11);

--- modified the contents of 6.3, will use a certain size of the constant DC signal (such as constant displacement xdc) and small AC signal

(Such as displacement xac) aliasing as an excitation source, measuring the steady-state suspension of the AC component response (such as the return force of the AC part

Fac "is modified to" use a constant DC signal with a certain size (such as constant force Fdc) and a small AC signal (such as restoring force

AC part of the Fac) aliasing as the excitation source, measuring the steady-state suspension of the AC component response (such as displacement xac) "(see 6.3);

--- modified the contents of 6.4, will use a certain size of the AC signal (such as displacement xac) as the excitation source, measuring the suspension components

Of the AC response (such as the exchange of response Fac) "modified to" use a certain size of the AC signal (such as AC reply force Fac)

As an excitation source, measure the AC response of the suspension (eg displacement xac) "(see 6.4);

--- delete the 7.2.3 "note" footnote;

- modify the contents of 9.1, and amend "(6)" to "(1)" (see 9.1);

--- increase the "use of wide-band sinusoidal signal to measure the displacement amplitude response X (jomega), to find the resonant frequency fR, get the most

Good measurement setting parameters (measuring voltage, peak displacement) "(see 10.2.3).

This standard is proposed by the Ministry of Industry and Information Technology of the People's Republic of China.

This standard is nationalized by the National Audio, Video and Multimedia Systems and Equipment Standardization Technical Committee (SAC/TC242).

The drafting of this standard. Nanjing Institute of Acoustics, Zhejiang Tianle Group Co., Ltd., Guangzhou Guoguang Electric Co., Ltd., Suzhou

Shangsheng Electronics Co., Ltd.

1 Scope

This standard specifies the measurement of the suspension components before the electro-acoustic transducer assembly, such as centering, folding, diaphragm or cone performance of the relevant parameters

Number and measurement methods. The measurement results can be used for engineering design and quality control. This standard can improve the manufacturer of the suspension parts and the speaker manufacturer

Consistency of measurement results.

This standard applies to the measurement of the suspension components of electroacoustic transducers (eg loudspeakers). Based on the linear model and the nonlinear model of the suspension component,

Static measurement method and dynamic measurement method were used to measure the relevant parameters.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article

Pieces. For undated references, the latest edition (including all modifications) applies to this document.

GB/T 12060.1-2017 Sound System Equipment Part 1 Overview (IEC 60268-1. 1985, MOD)

3 terms and definitions

The following terms and definitions apply to this document.

3.1

Suspension parts

A centering piece made of a dipped cloth, or a loop made of rubber, foamed material, paper or cloth.

3.2

Displacement

The distance at which the inner edge of the suspension member moves in the vertical direction.

3.3

Peak displacement

xpeak

The peak of displacement at the resonant frequency in the dynamic measurement.

3.4

Driving force

The restoring force, the frictional force and the inertia of the suspension member and its inner edge fixture.

3.5

Transfer function

H (f)

The ratio of the displacement spectrum X (jomega) = FT {x (t)} to the driving force spectrum F (jomega) = FT {F (t)} is defined by the formula (1)