CN114710384A - Automatic power adjusting method and terminal of high-power short-wave transmitter - Google Patents

Automatic power adjusting method and terminal of high-power short-wave transmitter Download PDF

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CN114710384A
CN114710384A CN202210303010.7A CN202210303010A CN114710384A CN 114710384 A CN114710384 A CN 114710384A CN 202210303010 A CN202210303010 A CN 202210303010A CN 114710384 A CN114710384 A CN 114710384A
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power
value
amplitude
adjusting
full
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李佳佳
张守忠
付欣
李学军
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Beijing Bbef Science and Technology Co Ltd
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Beijing Bbef Science and Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/04—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
    • H04L27/08—Amplitude regulation arrangements

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Transmitters (AREA)

Abstract

The invention discloses an automatic power regulating method and a terminal of a high-power short-wave transmitter, which are used for automatically regulating the power of the transmitter, detecting the amplitude of a modulation signal, calculating the amplitude modulation, segmenting the amplitude modulation range on the premise that an audio signal is not cut, adopting different regulating functions in different segments, regulating the magnitude of carrier direct-current screen voltage according to the amplitude modulation value, ensuring the receiving quality and saving electric energy by adopting one regulating function when the amplitude modulation value is smaller and the audio signal is weaker, and reducing the power and saving the electric energy by adopting the other regulating function when the amplitude modulation value is larger.

Description

Automatic power adjusting method and terminal of high-power short-wave transmitter
Technical Field
The invention relates to the technical field of audio signal processing, in particular to an automatic power adjusting method and a terminal of a high-power short-wave transmitter.
Background
The transmitted signal comprises a carrier direct current component and an alternating current signal component, the carrier direct current component ensures that the modulation signal is not cut, and after the power is determined, the carrier direct current screen voltage is also determined.
At present, the power of a high-power short-wave transmitter does not change along with an audio modulation signal, and no matter how large the modulation amplitude of the modulation signal is, the transmission power value is constant as long as a certain power is set. If the average modulation amplitude of the broadcast program is low and the carrier dc screen voltage remains unchanged, a large amount of power is wasted, and a large loss of electronic devices is caused, which increases the cost, as shown in fig. 1.
The high-frequency power output by the AM broadcast transmitter includes carrier power and sideband power, the carrier power is fixed and does not change with the change of the modulation signal, and the value of the carrier power is far larger than the sideband power. Generally, the average modulation of a broadcast program is low, about 20%.
Therefore, how to adjust the transmission power according to the amplitude modulation of the modulation signal and reduce the waste is a problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide an automatic power adjusting method and a terminal of a high-power short-wave transmitter, which are used for calculating an amplitude modulation value, segmenting the amplitude modulation value range, setting modulation functions of different sections according to the amplitude modulation value, modulating a carrier direct-current signal when the amplitude modulation value is in different sections, and reducing the carrier direct-current screen voltage on the premise that an audio signal is not cut, thereby reducing the power loss and achieving the purpose of energy conservation.
In a first aspect, the above object of the present invention is achieved by the following technical solutions:
the automatic power regulating method for high-power short-wave transmitter includes detecting amplitude of modulated signal, calculating amplitude modulation, regulating DC carrier screen voltage and lowering power according to the amplitude modulation without cutting audio signal.
The invention is further configured to: and (3) segmenting the range of the amplitude modulation value, adopting different modulation functions in different segments, and adjusting the magnitude of the carrier direct current screen voltage according to the magnitude of the amplitude modulation value.
The invention is further configured to: at least two set values are set, and the amplitude adjusting value range is divided into at least three sections.
The invention is further configured to: the number of the set values is two, the first set value is smaller than the second set value, and when the amplitude adjusting value is larger than or equal to zero and smaller than the first set value, the carrier direct current screen voltage V is adjustedRegulating deviceVoltage V corresponding to full powerIs full ofThe ratio of (a) to (b) is inversely proportional to the amplitude modulation value; when the amplitude value is greater than or equal to the first set value and smaller than the second set value, adjusting according to the first adjusting value; when the amplitude value is more than or equal to a second set value and less than or equal to 100 percent, the carrier direct current screen voltage V is adjustedRegulating deviceVoltage V corresponding to full powerIs full ofIs proportional to the amplitude modulation value.
The invention is further configured to: the first set point is equal to 30% and the second set point is equal to 50%.
The invention is further configured to: when the amplitude value is greater than or equal to zero and smaller than a first set value, at least one adjusting gear is set, different adjusting amplitudes are adopted for each gear, the carrier direct-current screen voltage is adjusted at different rates, and when the amplitude value is 0, different DBs are adjusted downwards maximally corresponding to the carrier level.
The invention is further configured to: when the amplitude value is adjusted to be 0, the carrier wave direct current screen voltage V is adjusted in different waysRegulating deviceVoltage V corresponding to full powerIs full ofTaking the multiple of the logarithmic function as different adjusting gears.
The invention is further configured to: the gear position is adjusted to be equal to 20lg (V)Regulating device/VIs full of)。
The invention is further configured to: the first regulating value is 0.5, namely the regulated carrier direct current screen voltage VRegulating deviceVoltage V corresponding to full powerIs full ofIs equal to 0.5.
In a second aspect, the above object of the present invention is achieved by the following technical solutions:
an automatic power regulation terminal of a high-power short-wave transmitter comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the computer program to realize the method.
Compared with the prior art, the beneficial technical effects of this application do:
1. the method and the device have the advantages that the whole amplitude modulation value range is segmented, different modulation functions are respectively set in different segments, the carrier direct current screen voltage is modulated, the carrier direct current screen voltage is reduced when the audio signal is not cut, the power consumption is reduced, and the energy is saved;
2. furthermore, in the range of the amplitude modulation value in the first section, the ratio of the regulated carrier direct current screen voltage to the full power screen voltage is inversely proportional to the amplitude modulation value, and the carrier power is reasonably reduced on the premise of ensuring the receiving quality;
3. furthermore, different adjusting gears are set in the range of the first amplitude adjusting value, and rapid adjustment is realized according to the adjustment reduction rate of the carrier direct current screen voltage;
4. furthermore, the method and the device can adjust the amplitude modulation value range in the second section according to the adjustment value, and adjust the amplitude modulation value range in the third section according to the direct proportion relation, so that the purpose of saving energy is achieved while the receiving quality is ensured.
Drawings
FIG. 1 is a prior art plot of carrier power without adjustment;
FIG. 2 is a diagram illustrating adjusted carrier power according to an embodiment of the present application;
fig. 3 is a schematic diagram comparing carrier dc screen voltages according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed description of the preferred embodiment
The utility model provides an automatic power adjustment method of high-power short wave transmitter, under the prerequisite that does not change audio signal, adjust carrier direct current screen according to amplitude modulation value and take, make the direct current screen of transmitter press and change along with the dynamic level size of modulation signal, thereby make carrier power change along with the change of modulation signal amplitude modulation, realize the automatically regulated of power, under the condition that keeps sideband power unchangeable, effectively reduce the shared proportion of carrier power in total transmitted power frequency spectrum, energy saving when guaranteeing the broadcast effect, raise the efficiency. By adopting the power automatic control technology, the problem of greatly reducing the electric energy consumption of the transmitter under the condition that the coverage field intensity and the listening effect of the high-power short-wave transmitter are not influenced is solved, and the power automatic control technology has remarkable social benefit and economic benefit.
Detecting the amplitude of the transmitted modulation signal, calculating the amplitude modulation value, and adjusting the carrier dc screen voltage according to the amplitude modulation value on the premise that the audio signal is not cut, so as to reduce the transmission power and save energy, as shown in fig. 2.
The value range of the amplitude modulation value is 0-100%, the value range of the amplitude modulation value is segmented, different modulation functions are adopted in different segments, and the magnitude of the carrier direct current screen voltage is adjusted according to the magnitude of the amplitude modulation value.
The expression of the amplitude modulated signal is: sAM(t)＝[V0+M(t)]cosωct (1)；
Wherein M (t) represents a modulation signal, V0Representing the direct component of the carrier without regulation, ωcRepresenting the carrier frequency.
As can be seen from the expression, when | M (t) & gt is non-volatilemax≤V0In time, the overshoot phenomenon, i.e., the audio signal is not cut, does not occur.
When | M (t) |max＝V0The modulation is full when the time is long,
and because M (t) ═ Amcos ωmt (2)；
Therefore, | M (t) non-combustiblemax＝|Am|×|cos ωmt|＝Am (3)；
The modulation amplitude m is the voltage ratio of the modulation signal voltage to the carrier dc voltage,
namely, it is
Figure BDA0003566274400000051
When fully modulated, amplitude value m is adjustedIs full of＝100％，
|M(t)|max＝Am＝V0＝VIs full of (5)。
When m is less than 1, power is wasted.
Adjusting carrier DC screen voltage to VRegulating deviceIf full modulation is desired, V needs to be satisfiedRegulating device＝Am，
According to equation 4, then VRegulating device＝Am＝mV0 (6)；
Adjusting the carrier DC screen voltage V according to the amplitude-adjusting value0Obtaining the regulated carrier DC screen voltage VRegulating device。
If formula 5 is adopted to calculate the adjusted carrier DC screen voltage VRegulating deviceIf the modulation amplitude is smaller, the carrier level should be smaller, but when the modulation amplitude is smaller, the audio signal itself is weaker, and if the carrier power is also too small, the receiving effect is poor, and although the power reduction is realized, the receiving quality cannot be ensured.
Therefore, the method and the device have the advantages that the whole amplitude modulation value range is segmented according to the amplitude modulation value, and the corresponding adjustment function is set for control, so that the purposes of reducing power and ensuring receiving quality are achieved.
The number of segments is set according to the accuracy of the automatic power adjustment. Different adjusting functions are set in different sections, and the magnitude of the carrier direct current screen voltage is adjusted on the premise that the alternating current signals are not cut.
Three segments are taken as an example for explanation, and the number of the rest segments is analogized and is not repeated.
As shown in fig. 3, in an embodiment of the present application, two setting values are provided to divide the range of the amplitude modulation value into three sections, and the first setting value is smaller than the second setting value.
In the first section, when the amplitude value is more than or equal to zero and less than a first set value, the carrier DC screen voltage V is adjustedRegulating deviceVoltage V corresponding to full powerIs full ofIs inversely proportional to the amplitude modulation value, i.e.:
Vregulating device＝VIs full of×(k1/m) (7)；
In the formula, k1 is a constant and is set as necessary.
In the second stage, when the amplitude adjustment value is greater than or equal to the first set value and less than the second set value, the adjustment is performed according to a first adjustment value, and the first adjustment value is as follows:
Vregulating device＝VIs full of×(k2) (8)；
In the formula, k2 is a constant and is set as necessary.
In the third section, the amplitude value is greater than or equal to the second set value and less than or equal to VIs full ofWhen the voltage is 100%, the carrier wave DC screen voltage V is adjustedRegulating deviceVoltage V corresponding to full powerIs full ofIs proportional to the amplitude modulation value. Namely:
Vregulating device＝VIs full of×m×(k3) (9)；
In the formula, k3 is a constant and is set as necessary.
In a specific embodiment of the present application, in the first segment, at least one adjustment gear is set, each gear adopts different adjustment amplitudes, the carrier dc screen voltage is adjusted at different rates, and when the adjustment amplitude value is 0, different DBs are adjusted downward maximally corresponding to the carrier level.
When the amplitude modulation value is 0, the carrier wave direct current screen voltage V after different adjustmentsRegulating deviceVoltage V corresponding to full powerIs full ofThe ratio of (a) is a multiple of the logarithmic function, and the multiple is used as different adjustment gears.
In one particular embodiment of the present application, the first set point is equal to 30% and the second set point is equal to 50%. First regulation value VRegulating device＝0.5×VIs full of。
When the amplitude modulation value is in the first section, setting the adjusted carrier wave direct current screen voltage V when the amplitude modulation value is 0Adjust 0At 20lg (V)Adjust 0/VIs full of) For adjusting the gear by VAdjust 0As a starting point, 0.5 XVIs full ofAnd setting different adjusting gears as the end point.
With VIs full ofFor 14KV as an example, the first shift position, VAdjust 0When 12KV is satisfied:
20lg(Vadjust 0 to/VIs full of) -1.3, is (1/6) DB, i.e. falls off with a (1/6) DB slope.
Second adjustment gear, VAdjust 0When the voltage is 11 KV:
20lg(Vadjust 0/VIs full of) -2.1, is (2/6) DB; i.e., fall in (2/6) DB.
Third adjustment gear, VAdjust 0When 10KV is obtained:
20lg(Vadjust 0/VIs full of) -2.9, is (3/6) DB, i.e. falls off as (3/6) DB.
At VRegulating device＝0.5×VIs full ofAt a value of 20lg (V)Regulating device/VIs full of)＝-6DB。
The slope of each adjusting gear is reduced in the following same way, and when the amplitude adjusting value is 30%, the adjusted carrier direct current screen voltage reaches V which is 0.5 times that of the adjusted carrier direct current screen voltageIs full of。
And the rest gears are adjusted, and so on.
Between the first set value of 30% and the second set value of 50%, the carrier wave DC screen voltage V is adjustedRegulating device＝0.5×VIs full ofAnd is the first adjustment value.
At a second set point of 50% and mIs full ofAfter adjustment, the carrier wave DC screen voltage VRegulating device＝m×VIs full of
After the carrier direct-current screen voltage of the power-saving carrier direct-current broadcast transmitter is adjusted, if the carrier level constant value of the common high-power broadcast transmitter is set to be 1, the average value of the carrier voltage of the automatic power adjustment transmitter in operation is about 0.6-0.8, the carrier voltage is different according to different adjustment gears, so that the average saved carrier power is about 40% -20%, if the efficiency of the high end of the transmitter in level adjustment is 50%, the saved carrier power of 1KW can bring the power consumption of saving 2KW, and the energy-saving effect is very considerable.
In the broadcasting process, the automatic power regulation technology automatically reduces the amplitude of the carrier level according to the real-time amplitude regulation of the audio signal, and simultaneously ensures the normal carrier sideband power in a larger modulation degree, thereby achieving the purposes of not influencing the receiving effect and saving electric energy. Meanwhile, the temperature of large-scale devices in the transmitter is obviously reduced due to the reduction of the carrier power, and the service life of the large-scale devices is prolonged. The automatic power regulation technology is used in the high-power transmitting equipment, so that the electric energy loss and the maintenance cost can be greatly reduced.
Detailed description of the invention
The automatic power regulation terminal of the high-power short-wave transmitter comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, such as a program for automatically regulating carrier direct-current screen voltage, wherein the judgment step in embodiment 1 is realized when the processor executes the computer program;
alternatively, the processor, when executing the computer program, implements the functions of the modules/units in the above device embodiments, for example: a feature calculating module and a judging module.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the automatic power adjusting terminal device of the high power short wave transmitter. For example, the computer program may be divided into a plurality of modules, each module having the following specific functions:
1. the calculation module is used for calculating the amplitude modulation value;
2. and the power adjusting module is used for carrying out automatic power adjustment.
The automatic power regulation terminal equipment of the high-power short wave transmitter can be computing equipment such as a desktop computer, a notebook computer, a palm computer and a cloud server. The terminal device for automatic power regulation of the high-power short-wave transmitter may include, but is not limited to, a processor and a memory. It will be appreciated by those skilled in the art that the above examples are merely illustrative of the terminal device for automatic power adjustment of a high power short wave transmitter and do not constitute a limitation of the terminal device for automatic power adjustment of a high power short wave transmitter, and may include more or less components than those shown, or some components in combination, or different components, for example, the terminal device for automatic power adjustment of a high power short wave transmitter may further include an input-output device, a network access device, a bus, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general processor may be a microprocessor or the processor may be any conventional processor, etc., and the processor is a control center of the automatic power adjusting terminal equipment of the high-power short-wave transmitter, and various interfaces and lines are used to connect various parts of the automatic power adjusting terminal equipment of the whole high-power short-wave transmitter.
The memory may be used to store the computer programs and/or modules, and the processor may implement various functions of the automatic power adjusting terminal device of the high-power short-wave transmitter by operating or executing the computer programs and/or modules stored in the memory and calling the data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Detailed description of the preferred embodiment
The module/unit integrated with the automatic power regulation terminal device of the high-power short-wave transmitter can be stored in a computer readable storage medium if it is implemented in the form of a software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments described above may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc.
The embodiments of the present invention are all preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (10)

1. An automatic power regulation method of a high-power short-wave transmitter is characterized in that: and detecting the amplitude of the modulation signal, calculating the amplitude modulation, and adjusting the carrier direct current screen voltage according to the amplitude modulation on the premise that the audio signal is not cut, so as to reduce the power.
2. The method of claim 1, wherein the step of automatically adjusting the power of the high power short wave transmitter further comprises the steps of: and (3) segmenting the range of the amplitude modulation value, adopting different modulation functions in different segments, and adjusting the magnitude of the carrier direct current screen voltage according to the magnitude of the amplitude modulation value.
3. The method of claim 2, wherein the step of automatically adjusting the power of the high power short wave transmitter comprises: at least two set values are set, and the amplitude adjusting value range is divided into at least three sections.
4. The method of claim 3, wherein the step of automatically adjusting the power of the high power short wave transmitter comprises: the number of the set values is two, the first set value is smaller than the second set value, and when the amplitude adjusting value is larger than or equal to zero and smaller than the first set value, the carrier direct current screen voltage V is adjustedRegulating deviceVoltage V corresponding to full powerIs full ofThe ratio of (a) to (b) is inversely proportional to the amplitude modulation value; when the amplitude value is greater than or equal to the first set value and smaller than the second set value, adjusting according to the first adjusting value; when the amplitude value is more than or equal to a second set value and less than or equal to 100 percent, the carrier direct current screen voltage V is adjustedRegulating deviceVoltage V corresponding to full powerIs full ofIs proportional to the amplitude modulation value.
5. The method of claim 4, wherein the step of automatically adjusting the power of the high power short wave transmitter further comprises the steps of: the first set point is equal to 30% and the second set point is equal to 50%.
6. The method of claim 4, wherein the step of automatically adjusting the power of the high power short wave transmitter further comprises the steps of: when the amplitude value is greater than or equal to zero and smaller than a first set value, at least one adjusting gear is set, different adjusting amplitudes are adopted for each gear, the carrier direct-current screen voltage is adjusted at different rates, and when the amplitude value is 0, different DBs are adjusted downwards maximally corresponding to the carrier level.
7. The method of claim 6, wherein the step of automatically adjusting the power of the high power short wave transmitter comprises: when the amplitude modulation value is 0, the carrier wave direct current screen voltage V after different adjustmentsRegulating deviceVoltage V corresponding to full powerIs full ofThe ratio of (a) is a multiple of the logarithmic function, and the multiple is used as different adjustment gears.
8. The method of claim 7, wherein the step of automatically adjusting the power of the high power short wave transmitter comprises: the gear position is adjusted to be equal to 20lg (V)Regulating device/VIs full of)。
9. The method of claim 4, wherein the step of automatically adjusting the power of the high power short wave transmitter further comprises the steps of: the first regulating value is 0.5, namely the regulated carrier direct current screen voltage VRegulating deviceVoltage V corresponding to full powerIs full ofIs equal to 0.5.
10. An automatic power regulation terminal for a high power short wave transmitter comprising a memory, a processor, and a computer program stored in said memory and operable on said processor, characterized in that: the processor, when executing the computer program, implements the method of any of claims 1-9.
CN202210303010.7A 2022-03-25 2022-03-25 Automatic power adjusting method and terminal of high-power short-wave transmitter Pending CN114710384A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86101090A (en) * 1986-01-31 1987-08-26 北京广播学院 Amplitude modulation apparatus with floating carrier
US20120045022A1 (en) * 2009-04-14 2012-02-23 Vinko Kunc Method and circuit for amplitude modulation of a carrier signal with a specified modulation factor
CN106209123A (en) * 2015-05-06 2016-12-07 北京北广科技股份有限公司 A kind of carrier wave floating power-economizing method of high-power transmitting equipment

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86101090A (en) * 1986-01-31 1987-08-26 北京广播学院 Amplitude modulation apparatus with floating carrier
US20120045022A1 (en) * 2009-04-14 2012-02-23 Vinko Kunc Method and circuit for amplitude modulation of a carrier signal with a specified modulation factor
CN106209123A (en) * 2015-05-06 2016-12-07 北京北广科技股份有限公司 A kind of carrier wave floating power-economizing method of high-power transmitting equipment

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Application publication date: 20220705