A method for calculating a temperature of a horn

Abstract

The embodiment of the present application provides a kind of loudspeaker temperature calculation method, the sum R of the impedance of loudspeaker and the connecting line connected with loudspeaker is calculated;The temperature rise coefficient of the connecting line connected with loudspeaker is calculated;The impedance of the connecting line connected with loudspeaker at ambient temperature is calculated by the temperature rise coefficient of the connecting line connected with loudspeaker;The temperature T of loudspeaker is calculated by the sum R of the impedance of loudspeaker and the connecting line connected with loudspeaker and the impedance of the connecting line connected with loudspeaker at ambient temperature.The loudspeaker temperature calculated by the embodiment of the present application is more accurate.

Description

Technical Field

[0001] This application relates to the field of audio technology, specifically to a method for calculating speaker temperature. Background Technology

[0002] Existing technology calculates speaker temperature based on the speaker's impedance and the impedance of the connecting cable at an ambient temperature of 25 degrees Celsius. However, it does not consider the change in impedance of the connecting cable due to temperature variations. Therefore, the calculated speaker temperature is inaccurate. Summary of the Invention

[0003] To address the aforementioned technical problems, the objective of this application is to provide a method for calculating the temperature of a loudspeaker, comprising:

[0004] Calculate the sum of the impedances R of the horn and the connecting wires to the horn;

[0005] Calculate the temperature rise coefficient of the connecting wires to the speaker;

[0006] The impedance of the connecting wire to the speaker at ambient temperature is calculated by using the temperature rise coefficient of the connecting wire.

[0007] The temperature T of the horn is calculated by the sum of the impedance R of the horn and the connecting wires connected to it, and the impedance of the connecting wires at ambient temperature.

[0008] In a preferred embodiment of this application, the calculation of the sum R of the impedance of the speaker and the connecting wire connected to the speaker includes:

[0009] Obtain the voltage of the connection wires connected to the speaker and the speaker itself, as well as the current flowing through the connection wires connected to the speaker and the speaker.

[0010] The sum of the impedances R of the connecting wires and the speaker connected to the speaker is calculated using the voltage and current.

[0011] As a preferred embodiment of this application, the calculation of the temperature rise coefficient of the connecting wire connected to the speaker is characterized by including:

[0012] The impedance of the connection wire to the speaker was measured at different temperatures by placing the connection wire to the speaker at different temperatures.

[0013] The temperature rise coefficient of the connecting wire to the speaker is calculated by measuring the impedance of the connecting wire at different temperatures.

[0014] In a preferred embodiment of this application, the calculation of the impedance of the connecting wire to the speaker at ambient temperature using the temperature rise coefficient of the connecting wire is specifically performed using the following formula:

[0015] Rapp=Rapp25*(1+β*(T1-25))

[0016] Where Rapp is the impedance of the connecting cable to the speaker at ambient temperature T1, Rapp25 is the impedance of the connecting cable to the speaker at ambient temperature 25 degrees, β is the temperature rise coefficient of the connecting cable to the speaker, and T1 is the ambient temperature.

[0017] In a preferred embodiment of this application, the temperature T of the horn is calculated by the sum of the impedance R of the horn and the connecting wire connected to the horn, and the impedance of the connecting wire connected to the horn at ambient temperature, specifically using the following formula:

[0018]

[0019] Where α25c is the temperature rise coefficient of the speaker at an ambient temperature of 25 degrees Celsius, Re25c is the impedance of the speaker at an ambient temperature of 25 degrees Celsius, Rapp25 is the impedance of the connecting wire to the speaker at an ambient temperature of 25 degrees Celsius, R is the sum of the impedances of the speaker and the connecting wire to the speaker, β is the temperature rise coefficient of the connecting wire to the speaker, R25 is the sum of the impedances of the speaker and the connecting wire to the speaker at an ambient temperature of 25 degrees Celsius, and T1 is the ambient temperature.

[0020] Compared with existing technologies, the embodiments of this application calculate the sum of the impedances R of the speaker and the connecting wires connected to the speaker; calculate the temperature rise coefficient of the connecting wires connected to the speaker; calculate the impedance of the connecting wires connected to the speaker at ambient temperature using the temperature rise coefficient of the connecting wires connected to the speaker; and calculate the speaker temperature T using the sum of the impedances R of the speaker and the connecting wires connected to the speaker and the impedance of the connecting wires connected to the speaker at ambient temperature. The speaker temperature calculated by the embodiments of this application is more accurate. Attached Figure Description

[0021] Non-limiting and non-exhaustive embodiments of the invention are described by way of example with reference to the following figures, wherein:

[0022] Figure 1 A flowchart illustrating a method for calculating the temperature of a horn is shown. Detailed Implementation

[0023] To make the above and other features and advantages of the present invention clearer, the invention will be further described below with reference to the accompanying drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation to those skilled in the art and are exemplary only, not restrictive.

[0024] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] The calculation of speaker temperature in traditional intelligent power amplifiers is already very mature, and the formula is as follows:

[0027]

[0028] Where α25c is the speaker's temperature rise coefficient at 25 degrees Celsius, usually provided by the speaker manufacturer; Re25c is the speaker's impedance at an ambient temperature of 25 degrees Celsius; and R0 is the speaker's impedance at a specified temperature T0. For the above formula, T0 is usually set to 25 degrees Celsius during calibration, so T0 = 25 and R0 = Re25c. Therefore, Re25c can be obtained from the above formula:

[0029]

[0030] According to the above formula, in the process of horn impedance calibration, as long as the ambient temperature T and the horn impedance R at the time of calibration are known, the impedance Re25c of the horn at an ambient temperature of 25 degrees can be calculated; the horn impedance R at the time of calibration can be obtained by dividing the voltage V of the horn by the current I flowing through the horn.

[0031] However, in most cases, when calibrating speaker impedance using Re25c, the speaker temperature at the time of calibration is not input separately; instead, the ambient temperature T is simply assumed. This obviously affects the accuracy of the Re25c calculation. Therefore, rigorous speaker impedance calibration must take the actual speaker temperature into account, for example, calibrating when the speaker temperature is 27 degrees Celsius.

[0032]

[0033] Once the horn impedance Re25c is obtained during calibration, the horn temperature T can be calculated based on the corresponding R. R can be obtained by dividing the horn voltage during operation by the current flowing through the horn.

[0034]

[0035] The above calculations do not take into account the impedance Rapp of the speaker connection cable, which leads to inaccurate calculations of the speaker temperature T.

[0036] In order to solve the above-mentioned technical problems, the applicant has studied and solved the technical problems in the prior art through the technical solutions provided in the embodiments of this application.

[0037] like Figure 1 As shown in the figure, this application provides a method for calculating the temperature of a horn, including:

[0038] Step S01: Calculate the sum of the impedances of the speaker and the connecting wires connected to the speaker;

[0039] Specifically, in step S01, the sum of the impedances R of the horn and the connecting wires connected to the horn is calculated, including:

[0040] Obtain the voltage of the connecting wire and the speaker connected to the speaker, and the current flowing through the connecting wire and the speaker connected to the speaker; calculate the impedance of the connecting wire and the speaker connected to the speaker using the voltage and current.

[0041] Specifically, the voltage V between the connecting wire and the speaker and the current I flowing through the connecting wire and the speaker are detected, and the result is obtained by dividing the voltage V between the connecting wire and the speaker and the current I flowing through the connecting wire and the speaker.

[0042] Step S02: Calculate the temperature rise coefficient of the connecting wire connected to the speaker;

[0043] In step S02, since the impedance of the connecting wire to the speaker changes with temperature, it is necessary to calculate the temperature rise coefficient of the connecting wire to the speaker. The calculation is performed in the following way.

[0044] The connection wire to the speaker is placed at different temperatures, and the impedance of the connection wire to the speaker at different temperatures is measured. The temperature rise coefficient of the connection wire to the speaker as a function of temperature is calculated based on the impedance of the connection wire to the speaker at different temperatures. In this embodiment, the impedance of the connection wire can be directly measured. Since there is a linear relationship between the impedance at different temperatures, the slope of this linear relationship is the temperature rise coefficient of the connection wire.

[0045] Step S03: Calculate the impedance of the connecting wire to the speaker at ambient temperature using the temperature rise coefficient of the connecting wire. Specifically, calculate using the following formula:

[0046] Rapp=Rapp25*(1+β*(T1-25))

[0047] Where Rapp is the impedance of the connecting cable to the speaker at ambient temperature T1, Rapp25 is the impedance of the connecting cable to the speaker at ambient temperature 25 degrees, β is the temperature rise coefficient of the connecting cable to the speaker, and T1 is the ambient temperature.

[0048] Step S04: Calculate the temperature T of the horn by the sum of the impedance R of the horn and the connecting wire connected to the horn, and the impedance of the connecting wire connected to the horn at ambient temperature.

[0049] If we take into account the impedance Rappa of the connecting cable to the speaker, then the relationship between the speaker temperature and the sum of the impedances R of the speaker and the connecting cable should be expressed as follows:

[0050]

[0051] On the surface, Rapp0 is subtracted in this new formula, which seems no different from the previous calculation method. However, this assumes that the impedance of the connection cable to the speaker has no temperature rise effect. But this is not the case in reality; the connection cable to the speaker also has a temperature rise coefficient. Therefore, the above formula needs to be revised as follows:

[0052]

[0053] If T0 is set to 25 degrees, then the above formula can be transformed into:

[0054]

[0055] Where β is the temperature rise coefficient of the connecting wire to the speaker. Generally, the wire resistance manufacturer will not provide this coefficient, and it can only be calculated from test data. Considering that (R25-Rapp25) is Re25c, the above formula can be simplified as follows:

[0056]

[0057] Where α25c is the temperature rise coefficient of the speaker at an ambient temperature of 25 degrees Celsius, Re25c is the impedance of the speaker at an ambient temperature of 25 degrees Celsius, Rapp25 is the impedance of the connecting wire to the speaker at an ambient temperature of 25 degrees Celsius, R is the sum of the impedances of the speaker and the connecting wire to the speaker, β is the temperature rise coefficient of the connecting wire to the speaker, R25 is the sum of the impedances of the speaker and the connecting wire to the speaker at an ambient temperature of 25 degrees Celsius, and T1 is the ambient temperature.

[0058] When calibrating a speaker, the ambient temperature must be taken into account; otherwise, the calibrated Re25c will not be the actual speaker impedance at a temperature of 25 degrees Celsius.

[0059] When considering the impedance (Rapp) of the connecting cable to the speaker, it is essential to take into account that the impedance changes with temperature; otherwise, the calculated absolute temperature of the speaker will deviate from the actual temperature of the speaker coil.

[0060] Compared with existing technologies, the embodiments of this application calculate the sum of the impedances R of the speaker and the connecting wires connected to the speaker; calculate the temperature rise coefficient of the connecting wires connected to the speaker; calculate the impedance of the connecting wires connected to the speaker at ambient temperature using the temperature rise coefficient of the connecting wires connected to the speaker; and calculate the speaker temperature T using the sum of the impedances R of the speaker and the connecting wires connected to the speaker and the impedance of the connecting wires connected to the speaker at ambient temperature. The speaker temperature calculated by the embodiments of this application is more accurate.

[0061] The technical features of the above implementation schemes can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above implementation schemes are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] Although the invention has been described in conjunction with embodiments, those skilled in the art will understand that the above description and drawings are exemplary and not restrictive, and the invention is not limited to the disclosed embodiments. Various modifications and variations are possible without departing from the spirit of the invention.

Claims

1. A method for calculating the temperature of a horn, characterized in that, include: Calculate the sum of the impedances of the horn and the connecting wires. ; Calculate the temperature rise coefficient of the connecting wires to the speaker; The impedance of the connecting wire to the speaker at ambient temperature is calculated by using the temperature rise coefficient of the connecting wire. The sum of the impedances of the speaker and the connecting wires connected to the speaker And the impedance of the connecting cable to the speaker at ambient temperature to calculate the speaker's temperature. .

2. The method for calculating the horn temperature as described in claim 1, characterized in that, The sum of the impedances of the horn and the connecting wires connected to the horn is calculated. ,include: Obtain the voltage and current of the connecting wires and the speaker connected to the speaker; The sum of the impedances of the connecting wires and the speaker are calculated using the voltage and current. .

3. The method for calculating the horn temperature as described in claim 1, characterized in that, The method for calculating the temperature rise coefficient of the connecting wire to the speaker is characterized by including: The connecting wires to the speaker were placed at different temperatures, and the impedance of the connecting wires to the speaker at different temperatures was measured. The temperature rise coefficient of the connecting wire to the speaker is calculated by measuring the impedance of the connecting wire at different temperatures.

4. The method for calculating the horn temperature as described in claim 1, characterized in that, The impedance of the connecting wire to the speaker at ambient temperature is calculated using the temperature rise coefficient of the connecting wire, specifically through the following formula: in, The impedance of the connecting cable to the speaker at ambient temperature T1. The impedance of the connection cable to the speaker at an ambient temperature of 25 degrees Celsius. The temperature rise coefficient of the connecting wires to the speaker. The ambient temperature.

5. The method for calculating the horn temperature as described in claim 1, characterized in that, The sum of the impedances of the horn and the connecting wires connected to the horn And the impedance of the connecting cable to the speaker at ambient temperature to calculate the speaker's temperature. Specifically, it is calculated using the following formula: in, This represents the temperature rise coefficient of the speaker at an ambient temperature of 25 degrees Celsius. The impedance of the speaker at an ambient temperature of 25 degrees Celsius. The impedance of the connection cable to the speaker at an ambient temperature of 25 degrees Celsius. This is the sum of the impedance of the speaker and the connecting wires connected to the speaker. The temperature rise coefficient of the connecting wires to the speaker. This is the sum of the impedances of the speaker and the connecting cables at an ambient temperature of 25 degrees Celsius. The ambient temperature.

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