CN114598969A

CN114598969A - Digital loudspeaker volume control method, device, equipment and medium

Info

Publication number: CN114598969A
Application number: CN202210225041.5A
Authority: CN
Inventors: 刘长华; 袁飞洋
Original assignee: Earth Mountain Suzhou Microelectronics Technology Co ltd
Current assignee: Earth Mountain Suzhou Microelectronics Technology Co ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-06-07

Abstract

The invention discloses a method, a device, equipment and a medium for controlling the volume of a digital loudspeaker, relates to the technical field of loudspeakers, and aims to solve the problems of tone quality reduction and complex manufacturing process in the prior art. The method comprises the following steps: by receiving a volume adjustment instruction; determining an electric energy signal loaded on a loudspeaker unit in each path of quantized audio digital stream based on the volume adjusting instruction; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal; and adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy amplitude or the electric energy acting time to complete volume adjustment. The scheme realizes volume control of digital sound production based on the electric energy amplitude or the electric energy acting time, not only does not need a digital-to-analog converter, but also does not need multiple times of hardware support of the transduction element, and controls the output sound pulse energy by controlling the electric signal energy loaded on the loudspeaker unit on the basis of not increasing the number of rows of the transduction element, thereby realizing digital volume adjustment.

Description

Digital loudspeaker volume control method, device, equipment and medium

Technical Field

The invention relates to the technical field of digital speakers, in particular to a method, a device, equipment and a medium for controlling the volume of a digital speaker.

Background

The loudspeaker is a transducer for converting an electric signal into an acoustic signal, and the performance of the loudspeaker has great influence on the sound quality. The loudspeaker is the weakest component in the audio equipment, and is the most important component for the audio effect. Loudspeakers are of a wide variety and vary widely in price. The audio frequency electric energy makes the paper cone or the diaphragm vibrate and generate resonance (resonance) with the surrounding air through electromagnetic, piezoelectric or electrostatic effect to make sound.

Digital sound is sometimes referred to as digital audio. Digital sound is sound that is recorded, stored, edited, compressed, restored or played by using a digital technology. The method has the characteristics of convenient storage, low storage cost, small distortion, very convenient editing and processing and the like.

In practical application, the sound of the analog loudspeaker is generated by pushing air to generate sound through the analog motion of the diaphragm, a digital-to-analog converter is needed in the analog loudspeaker sound generating principle, the volume control of the analog loudspeaker is mainly adjusted through a power amplifier, and the analog volume adjustment is realized by specifically controlling the current loaded to the voice coil. At present, speakers on the market are all analog speakers, and digital speakers and digital sound production chips gradually enter the speaker market by virtue of digital superiority.

The existing volume control scheme of the digital loudspeaker has the defects of sound quality reduction and complex manufacturing process, so that a reliable volume control scheme for digital sound production needs to be provided urgently.

Disclosure of Invention

The invention aims to provide a method, a device, equipment and a medium for controlling the volume of a digital loudspeaker, which are used for solving the problems of tone quality reduction and complex manufacturing process in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

in a first aspect, the present invention provides a method for controlling volume of a digital speaker, the method being applied to a digital speaker and including:

receiving a volume adjusting instruction;

determining an electric energy signal loaded on a loudspeaker unit in each path of quantized audio digital stream based on the volume adjusting instruction; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal;

and adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy signal to finish volume adjustment.

Optionally, when the electrical energy signal is an electrical energy amplitude, the adjusting, based on the electrical energy signal, the acoustic pulse energy output by the speaker unit to complete volume adjustment may specifically include:

adjusting the sound pressure amplitude of the loudspeaker unit according to a preset first corresponding relation between the electric energy amplitude and the sound pressure amplitude on the basis of the electric energy amplitude loaded on the loudspeaker unit;

based on the sound pressure amplitude, adjusting the sound pulse energy output by the loudspeaker unit to complete volume adjustment; wherein the amplitude of the electrical energy comprises a voltage amplitude or a current amplitude; the larger the voltage amplitude or the current amplitude is, the larger the sound volume is.

Optionally, when the electrical energy signal is an electrical energy action time, the sound pulse energy output by the speaker unit is adjusted based on the electrical energy signal to complete volume adjustment, which may specifically include:

based on the electric energy action time, according to a preset second corresponding relation between the electric energy action time and the sound pressure amplitude, adjusting the sound pressure amplitude of the loudspeaker unit, so that the sound pulse energy output by the loudspeaker unit is adjusted, and the volume adjustment is completed; wherein the longer the action time, the greater the volume.

In a second aspect, the present invention provides a digital speaker volume control device, comprising:

the volume adjusting instruction receiving module is used for receiving a volume adjusting instruction;

the electric energy signal determining module is used for determining an electric energy signal loaded to a loudspeaker unit in each path of quantized audio digital stream based on the volume adjusting instruction; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal;

and the volume adjusting module is used for adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy signal to complete volume adjustment.

In a third aspect, the present invention provides a digital speaker volume control apparatus comprising:

a communication unit/interface for receiving volume adjustment instructions;

a processing unit/processor for determining, based on the volume adjustment instructions, an electrical energy signal to be loaded onto the speaker unit in each quantized audio digital stream; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal;

In a fourth aspect, the present invention provides a computer storage medium having instructions stored therein, which when executed, implement the digital speaker volume control method described above.

Compared with the prior art, the volume control scheme for digital sounding provided by the invention receives the volume adjusting instruction; determining an electric energy signal loaded on a loudspeaker unit in each path of quantized audio digital stream based on the volume adjusting instruction; the electric energy signal at least comprises an electric energy amplitude or an electric energy action time; and adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy amplitude or the electric energy acting time to complete volume adjustment. The scheme realizes volume control of digital sound production based on the electric energy amplitude or the electric energy acting time, not only does not need a digital-to-analog converter, but also does not need multiple times of hardware support of the transduction element, and controls the output sound pulse energy by controlling the electric signal energy loaded on the loudspeaker unit on the basis of not increasing the line number of the transduction element, thereby realizing digital volume adjustment and solving the problems of sound quality reduction and complex manufacturing process in the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not limit the invention. In the drawings:

fig. 1 is a schematic diagram illustrating an implementation principle of a volume control method for a digital speaker according to the present invention;

fig. 2 is a schematic flow chart of a method for controlling the volume of a digital speaker according to the present invention;

fig. 3 is a schematic diagram of the corresponding level at the maximum volume in the volume control method for the digital speaker according to the present invention;

FIG. 4 is a schematic diagram of a scheme for adjusting volume according to action time in the volume control method for a digital speaker according to the present invention;

FIG. 5 is a schematic diagram of a scheme for adjusting volume according to amplitude of electric energy in the method for controlling volume of a digital speaker according to the present invention;

FIG. 6 is a schematic diagram of a digital speaker volume control apparatus according to the present invention;

fig. 7 is a digital speaker volume control device provided by the present invention.

Detailed Description

In order to facilitate clear description of technical solutions of the embodiments of the present invention, in the embodiments of the present invention, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. For example, the first threshold and the second threshold are only used for distinguishing different thresholds, and the sequence order of the thresholds is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

It is to be understood that the terms "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

In the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b combination, a and c combination, b and c combination, or a, b and c combination, wherein a, b and c can be single or multiple.

Before describing the embodiments of the present invention, the related terms related to the embodiments of the present invention are first explained as follows:

micro Electro Mechanical Systems (MEMS) are micro integrated Systems that use Integrated Circuit (IC) fabrication techniques and micro-fabrication techniques to fabricate micro sensors, micro actuators, etc. on one or more chips. A typical MEMS consists of sensors, information processing units, actuators, and communication/interface units, among others. The input signal is a physical signal, is converted into an electric signal through a sensor, and is acted with the outside by an actuator after signal processing (analog or/and digital). Each microsystem may communicate with other microsystems using digital or analog signals (physical quantities, electrical, optical, magnetic, etc.).

With the development of MEMS manufacturing processes, multi-pixel speaker sound units can be mass-manufactured on one MEMS chip. The loudspeakers used in the market at present are almost all analog loudspeakers, and the loudspeakers push air by controlling the movement of a vibrating diaphragm so as to realize analog sound production. Precise control of diaphragm motion is difficult to achieve, especially when the speaker is miniaturized. Therefore, digital speakers and digital sound chips are gradually entering the speaker market by virtue of their digital superiority, and then, in digital sound production, adjustment of volume is a scheme requiring further research.

Based on the scheme, the volume control scheme for digital sound production is applicable to a digital loudspeaker system, the sound production principle of the digital sound production is different from that of an analog loudspeaker in nature, and a digital-to-analog converter is not needed when the volume is regulated in the digital sound production process of the scheme. The existing digital loudspeaker volume control scheme can cause the number of the participated pixels to be reduced, thereby reducing the sound pressure level, causing the signal to noise ratio to be reduced, reducing the volume, causing the defects of volume reduction and sound quality reduction due to the obvious reduction of the sound quality, needing multiple times of hardware support of a transducer element and having higher process manufacturing and cost.

Next, the scheme provided by the embodiments of the present specification will be described with reference to the accompanying drawings:

fig. 1 is a schematic diagram illustrating an implementation principle of a volume control method for a digital speaker according to the present invention. As shown in fig. 1, the system may include:

ASIC chip 100 and speaker array 110. The ASIC chip 100 includes a digital sound reconstruction module 101, a multi-channel quantized audio digital stream 102, and a digital volume control module 103. Here, since Digital Sound Reconstruction (DSR) is used for short, the Digital Sound Reconstruction module 101 may also be referred to as a DSR module.

The sound source in fig. 1 is used as the input end of the whole system, and the format of the sound source can be various digital sound files. Such as WAV, MP3, AIF, etc. The input files with different formats have PCM data with different bits and different sampling frequencies and also have data with DSD format. Before entering DSR module 101, incoming digital sound files of different formats may be converted to PCM data in a common format, such as 16 bits, before being passed to DSR module 101. PCM data in a common audio source format, such as 24Bit, 44.1Hz, and sends the audio data in the common format to DSR module 101; the DSR module 101 may perform Sigma-Delta modulation and extraction operations on the audio data in the universal format to obtain a multi-path quantized audio digital stream, and send the multi-path quantized audio digital stream to the digital volume control module 103; the DSR module processes the digital signals divided into N channels, each channel of digital signals drives one channel of transduction element, and the multiple transduction elements reconstruct the sound waveform of the sound source to realize digital sound playing. For each audio data stream Sd1, Sd2, … …, Sdn, determining the power signal loaded on the speaker unit in each quantized audio data stream; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal; and adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy signal to complete digital volume adjustment, and driving the transducer element array to obtain a sound signal after the volume is adjusted.

In order not to increase the number of rows of the transduction elements, the scheme controls the energy of the output sound pulse by controlling the energy of the electric signal loaded on the loudspeaker unit, thereby realizing digital volume adjustment. The sound volume adjustment of the sound pulse control scheme of the transduction element does not need multiple loudspeaker units, the sound volume control is equivalent to circuit gain control, and the realization of the sound volume adjustment in the manufacturing process is simpler. And (3) analog volume adjustment, namely, the signal to noise ratio cannot be reduced when the volume is reduced, and digital sound size control is realized by controlling the size of the electric signal energy loaded to each path of loudspeaker. The digital volume control scheme can digitally convert 0 and 1 into a corresponding pulse electric signal loading scheme of one period by controlling the driving circuit, and finally the pulse electric signal loading scheme is supplied to the transduction element. This driven digital volume pulse control scheme comprises: amplitude control, time control, i.e. the electrical signal applied to each transducing element comprises: current/voltage amplitude control, current/voltage time control.

The specific implementation steps can be described in detail by combining the attached drawings of the specification:

fig. 2 is a schematic flow chart of a method for controlling volume of a digital speaker according to the present invention. From the perspective of a program, an execution subject of the process may be a server cluster or a processor corresponding to a sound volume control system of a digital speaker; taking a server cluster as an example, the server cluster may include various virtual modules in the system, so as to implement volume adjustment for digital sound generation after processing based on received audio data. In practical applications, the speaker needs to be applied to various devices for sound production, such as: portable terminals, household appliances or other intelligent terminals. Portable terminal can be wearable equipment such as intelligent glasses, intelligent wrist-watch, intelligent bracelet, intelligent dress, other intelligent terminal can be: cinema terminal, desktop computer, not portable terminal equipment. For example: the cinema terminal can comprise a plurality of loudspeakers with different sound channels, and the computer can comprise a left sound channel loudspeaker and a right sound channel loudspeaker. The intelligent terminal can also be a smart phone, a tablet computer, a palm computer and the like. In practical application, the terminal can be connected with the server in a Bluetooth mode, a wireless network mode, a mobile network mode and the like, and therefore volume adjustment of the digital loudspeaker is achieved.

As shown in fig. 2, the process may include the following steps:

step 210: and receiving a volume adjusting instruction.

The volume adjustment instruction may be sent by the server, and in practical application, the volume adjustment instruction may be sent to the server after the information acquisition module acquires the trigger information, and the server generates the volume adjustment instruction based on the trigger information. For example: the trigger information may include key information for indicating volume adjustment, the key may be a hardware key for volume adjustment, or may be a virtual key (a floating ball in a screen or a virtual sliding column for adjusting volume, etc.) for adjusting volume in a touch plane, and the information acquisition module acquires the trigger information for adjusting volume and sends the trigger information to the server. In addition, the trigger information may also be other information for instructing volume adjustment, such as: voice information, image information, or text information. The user voice control instructs to increase/decrease the volume, and the information acquisition module acquires the voice information and then sends the voice information to the server. The server can judge the task to be executed corresponding to the information based on the collected information, and correspondingly generates the instruction.

Step 220: determining an electric energy signal loaded on a loudspeaker unit in each path of quantized audio digital stream based on the volume adjusting instruction; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal.

The electric energy amplitude signal can be an electric pulse amplitude change numerical value signal under the action time of fixed electric energy. The electric energy action time can be an electric pulse time ratio value signal under a fixed electric energy amplitude.

Loudspeaker comprising an array of substantially identical transducers, each transducer for converting an electrical loudspeaker input signal into a sound pressure pulse output, wherein each transducer is drivable independently of the other by a digital signal representing sound to be produced by the loudspeaker.

In the digital volume pulse control scheme of driving, the power control may include: amplitude control and time control. The electrical signal applied to each of the transducing elements includes: current/voltage amplitude control, current/voltage time control.

Step 230: and adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy signal to finish volume adjustment.

The voltage gain is performed during analog volume adjustment, and is converted into a corresponding voltage, for example: and 8V, circuit driving is carried out, and the higher the voltage is, the higher the sound volume is. The amplitude and time of the electric energy can change the energy of the pulse, and the volume is adjusted through the control of the pulse energy. After the electric energy is added, the action time is different, and the maximum time corresponds to the maximum volume.

The method of fig. 2, by receiving a volume adjustment instruction; determining an electric energy signal loaded on a loudspeaker unit in each path of quantized audio digital stream based on the volume adjusting instruction; the electric energy signal at least comprises an electric energy amplitude or an electric energy action time; and adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy amplitude or the electric energy acting time to complete volume adjustment. The scheme realizes volume control of digital sound production based on the electric energy amplitude or the electric energy acting time, not only does not need a digital-to-analog converter, but also does not need multiple times of hardware support of the transduction element, and controls the output sound pulse energy by controlling the electric signal energy loaded on the loudspeaker unit on the basis of not increasing the number of rows of the transduction element, thereby realizing digital volume adjustment.

Based on the method of fig. 2, the embodiments of the present specification also provide some specific implementations of the method, which are described below.

Optionally, when step 230 in fig. 2 is actually implemented, the following implementation method may be specifically used to implement:

based on the volume adjustment instruction, a voltage or current loaded on the speaker may be determined; and adjusting the sound pressure amplitude of the loudspeaker based on the voltage or the current to complete volume adjustment.

The analog volume adjusting method can be described with reference to fig. 1, and the volume adjustment is realized by controlling the magnitude of voltage or current loaded on the speaker unit so as to control the sound pressure amplitude, and the analog volume adjustment does not need multiple speaker units, and the volume control is equivalent to circuit gain control, so that the volume adjustment is simpler to realize in the manufacturing process. The analog volume adjustment does not reduce the signal to noise ratio when the volume is reduced, because the amplitude of the loudspeaker is reduced after the analog voltage is reduced, the nonlinearity is reduced, and the distortion is reduced.

When the volume is adjusted through the electric energy signal, the volume adjusting method can be realized through two implementation modes: amplitude of the electrical energy and duration of action. The energy of the pulse can be changed, and the volume can be adjusted through controlling the energy of the pulse. After the electric energy signal is added, the action time is different, and the full time corresponding to the maximum volume is obtained. Specifically, the method can be realized by the following two methods:

the method comprises the following steps of carrying out volume adjustment through electric energy amplitude:

when the electrical energy signal is an electrical energy amplitude, the adjusting, based on the electrical energy signal, the acoustic pulse energy output by the speaker unit to complete volume adjustment may specifically include:

based on the sound pressure amplitude, adjusting the sound pulse energy output by the loudspeaker unit to complete volume adjustment; wherein the amplitude of the electric energy comprises a voltage amplitude or a current amplitude; the larger the voltage amplitude or the current amplitude is, the larger the sound volume is.

When the volume control is performed based on the electric energy amplitude, various specific embodiments may be included:

(1) when the electric energy amplitude value corresponds to a specific sound pressure amplitude value:

the adjusting, based on the electric energy amplitude loaded onto the speaker unit, the sound pressure amplitude of the speaker unit according to a preset first corresponding relationship between the electric energy amplitude and the sound pressure amplitude may specifically include:

and determining a specific sound pressure amplitude corresponding to the electric energy amplitude based on the electric energy amplitude loaded on the loudspeaker unit.

(2) The applied power amplitude is compared with the previous power amplitude, so that the adjustment direction is determined:

determining an adjustment direction of the sound pressure amplitude based on the magnitude of the electric energy loaded to the speaker unit; the adjusting direction comprises increasing the sound pressure amplitude or decreasing the sound pressure amplitude;

and adjusting the sound pressure amplitude based on the adjustment direction according to a preset adjustment rule.

For example: compared with the last time, the amplitude of the applied electric energy is increased, so that the amplitude of the sound pressure can be increased according to a preset proportion, and the volume can be increased.

Furthermore, a mapping relationship among the electric energy signal (electric energy amplitude, action time), the sound pressure amplitude and the volume level may be preset, specifically, a mapping relationship among specific adjustment values may be preset, and a mapping relationship among adjustment ratios may also be preset, which is not limited in the present invention. For example: the volume adjustment instruction may be: the instruction for indicating the specific volume gear needing to be adjusted can also be an instruction for only indicating the volume to be turned up or turned down. For example: the volume adjustment command at least includes a target volume gear to be adjusted, for example: the target volume included in the first volume adjustment instruction is "3 rd gear" or "60", or the like. In practical application, the full volume may be set to 10 th gear or 100 th gear. Of course, the specific volume level setting may be set based on the actual application, and this is not particularly limited in the embodiments of the present specification.

Alternatively, in one embodiment, the step setting of the volume may be set according to the manner in which the transducing elements in the loudspeaker are arranged. And mapping relation between the number of rows of the transduction elements in each quantized audio digital stream and the volume gear setting, so as to carry out corresponding volume gear setting. When the volume adjustment is realized, the number of the transduction elements in each quantized audio digital stream is not increased, and the volume adjustment is performed by applying electric energy.

The mapping relation among the electric energy signal (electric energy amplitude, action time), the sound pressure amplitude and the volume gear can be stored in a corresponding memory of the server in advance for later calling. The mapping relationship may be set according to a use requirement in an actual application, and this specification is not particularly limited thereto.

In the actual application scene, especially after functions such as speech control or image recognition control are added to the smart machine, the user can liberate both hands, and directly send out the instruction through the pronunciation, and at this moment, the user need not spend time to remember the concrete gear of volume, only need give "turn up volume" or "turn down volume" relevant instruction can, the server can adjust according to presetting the adjustment rule, for example: and setting the full volume to be 100 and the lowest volume to be 0, if the current volume is the full volume, not continuously turning up the volume, and if the current volume is 0, not continuously turning down the volume. In addition, when receiving a user's instruction, the volume is increased or decreased proportionally according to a preset number, for example: the current volume is 80, when receiving a command of reducing the volume of the user, the current volume can be reduced according to the proportion of reducing 20 every time, namely when receiving the command of reducing the volume for the first time, the current volume is adjusted to 60 and prompts the user, when receiving the command of reducing the volume for the second time, the current volume is adjusted to 40 and prompts the user, and so on, until the command of adjusting the volume of the user is not received in the preset time. Different volume instructions can apply different electric energy signals in each path of audio digital stream correspondingly, so that the amplitude of sound pressure is adjusted, and the volume is adjusted to a corresponding gear.

The second method is that volume adjustment is carried out through action time:

when the electric energy signal is an electric energy action time, the sound pulse energy output by the speaker unit is adjusted based on the electric energy signal to complete volume adjustment, which may specifically include:

Further, before adjusting the sound pressure amplitude of the speaker unit according to a preset second corresponding relationship between the electric energy action time and the sound pressure amplitude based on the electric energy action time, the method may further include:

determining an action time range corresponding to the volume adjustment range;

establishing a second corresponding relation between the sound pressure amplitude corresponding to the volume and the action time; the longest action time corresponds to the sound pressure amplitude of the maximum volume.

In practical application, different action times of the electric energy correspond to different volume sizes, and the longer the action time is, the larger the volume is.

By the two methods, the volume control of digital sound production can be realized based on the electric energy amplitude or the electric energy action time, a digital-to-analog converter is not needed, and multiple times of hardware support of the energy conversion elements are not needed, and on the basis of not increasing the number of lines of the energy conversion elements, the output sound pulse energy is controlled by controlling the electric signal energy loaded on the loudspeaker unit, so that the digital volume adjustment is realized.

It should be noted that the digital speaker applied in the present invention may mainly protect the hardware of the sound generating array topology, and the sound generating array is a linear sound source or an N × M array, etc. The micro MEMS loudspeaker can be applied to a micro MEMS loudspeaker, a plate electrode on one side is a vibrating diaphragm, a plate electrode on the other side is a driving plate, and round holes or long holes distributed in an array mode can be formed in the driving plate. The number of the MEMS loudspeakers can be multiple, and the arrangement mode can be array distribution, line arrangement or row-column arrangement. Correspondingly, when the sound is driven to generate, the multi-channel quantized audio digital stream can be converted into a driving electric signal, the driving electric signal is adopted to drive the transduction element array to obtain a sound signal, and when the volume is adjusted, the sound is realized by adjusting the transduction element in each channel of audio digital stream.

When the audio is grouped, the audio can be grouped based on a DSR module, the DSR module can be based on a single-Bit Sigma-Delta digital sound reconstruction technology or a multi-Bit Sigma-Delta digital sound reconstruction technology, and the specific implementation steps can include:

performing oversampling operation on the digital audio data to be processed to obtain first digital audio data; the first digital audio data is digital audio data subjected to oversampling by R times; r is more than or equal to 0;

performing noise wave shaping and quantization on the first digital audio data to obtain a second audio digital stream;

and grouping the second audio digital stream according to the number of the lines of the transduction elements in the digital loudspeaker to obtain a multi-path quantized audio digital stream. Wherein R can be 64, 128, etc.

The multi-Bit SDM and single-Bit SDM principles are approximately the same. Except that the amplitude of the electrical signal to each pixel speaker has a plurality of step values. In quantization accuracy, multiple bits are higher. Such as: the 1Bit-SDM digital stream is 0, 1; the 2Bit-SDM digital stream is 0, 0.5 and 1;

the method for realizing the sound production of the digital loudspeaker by multiple bits mainly comprises two modes:

the first method is as follows: as with 1Bit, N sets of data are extracted directly, except that each signal contains more than 0, 1 levels, with intermediate steps. And then, the data stream is directly sent to the corresponding loudspeaker, and the loudspeaker outputs sound energy with different pulse amplitudes after receiving the electric signals with different steps.

The second method comprises the following steps: taking 2Bit as an example: the 2Bit-SDM digital stream is 0, 0.5 and 1; assuming that each pixel speaker operates at 0.5, 1 requires 2 pixels to be simultaneously involved. Thus, another logic is presented: it is assumed that the number of loudspeakers per row may be 1 or 2. Assuming a digital stream of 0.5, 1 loudspeaker is correspondingly driven; the digital stream is 1, corresponding to driving 2 loudspeakers. This quantization step size is responded by driving the number of loudspeakers at once. Here, a switch is also required to ensure the switching of the number of speakers. The consistency is better.

The above embodiments are only individual embodiments capable of realizing the schemes provided in the examples of the present specification, and do not represent the entire scope of protection of the present application, and there may be many other embodiments other than the above-described embodiments, and the examples of the present specification are not particularly limited.

The pulse driving scheme is a pulse voltage scheme that digitally converts 0, 1 into corresponding one cycle, and finally gives to the transducing element. The driving pulse voltage scheme can be a triangular, rectangular, trapezoidal and other pulse voltage/current waveform, the energy conversion device is driven to work and sends out an acoustic pulse to the space, and the single energy conversion element can be any electroacoustic energy conversion device, such as an electrostatic type, a piezoelectric type, an electrodynamic loudspeaker and the like. The electrical signals, such as voltage/current, applied to the speaker elements can be controlled. Taking the MEMS electrostatic transducer as an example, the following description is made with rectangular pulses respectively:

fig. 3 is a schematic diagram of the corresponding level at the maximum volume in the volume control method for the digital speaker according to the present invention; fig. 4 is a schematic diagram of a scheme for adjusting volume according to action time in the volume control method for a digital speaker according to the present invention; fig. 5 is a schematic diagram of a scheme for adjusting volume by using electric energy amplitude in the volume control method for a digital speaker according to the present invention.

As in fig. 3-5, the abscissa indicates time and the ordinate indicates level, the voltage scheme being a drive pulse represented by a digital signal 0 or 1 during 1 period T. When the pulse is a rectangular pulse, assuming that the digital signal changes from 0 to 1, the electrical signal applied to the transducer changes from level 1 to level 2 and back to level 1 in a rectangular shape. The pulse loading voltage scheme of each period T time has a delay time period Ta and an off time period Tb respectively. The level 1 and level 2 amplitudes may be changed by the gain module of the analog volume adjustment. Fig. 3 is a schematic diagram of the corresponding level at the maximum volume, and the amplitude and the acting time of the electric energy can be adjusted to meet other operation processing, fig. 4 is a scheme of reducing the volume by shortening the acting time, and the acting time is shortened from Tb to Tbi, and the volume is adjusted by changing the time. Fig. 5 shows that the volume is reduced by reducing the level amplitude, and the level 2 is reduced to adjust the volume.

Based on the same idea, the embodiment of the present specification further provides a digital speaker volume control device. Fig. 6 is a schematic diagram of a digital speaker volume control apparatus according to the present invention. The method can comprise the following steps:

a volume adjustment instruction receiving module 610, configured to receive a volume adjustment instruction;

a power signal determining module 620, configured to determine, based on the volume adjustment instruction, a power signal to be loaded to a speaker unit in each quantized audio digital stream; the electric energy signal at least comprises an electric energy amplitude signal or an electric energy action time signal;

and a volume adjusting module 630, configured to adjust the energy of the acoustic pulse output by the speaker unit based on the electrical energy signal, so as to complete volume adjustment.

Based on the apparatus in fig. 6, there are some implementation modules, which are described below:

optionally, when the electrical energy signal is an electrical energy acting time, the volume adjusting module 630 may specifically include:

the action time volume adjusting unit is used for adjusting the sound pressure amplitude of the loudspeaker unit according to a preset second corresponding relation between the electric energy action time and the sound pressure amplitude based on the electric energy action time, so that the sound pulse energy output by the loudspeaker unit is adjusted, and the volume adjustment is completed; wherein the longer the action time, the greater the volume.

Optionally, when the electrical energy signal is an electrical energy amplitude, the volume adjusting module 630 may specifically include:

the sound pressure amplitude adjusting unit is used for adjusting the sound pressure amplitude of the loudspeaker unit according to a preset first corresponding relation between the electric energy amplitude and the sound pressure amplitude on the basis of the electric energy amplitude loaded on the loudspeaker unit;

the electric energy amplitude adjusting tone node unit is used for adjusting the sound pulse energy output by the loudspeaker unit based on the sound pressure amplitude to complete volume adjustment; wherein the amplitude of the electrical energy comprises a voltage amplitude or a current amplitude; the larger the voltage amplitude or the current amplitude is, the larger the sound volume is.

Optionally, the volume adjusting module 630 may be further configured to:

determining an action time range corresponding to the volume adjustment range;

Optionally, the sound pressure amplitude adjusting unit may specifically include:

the sound pressure amplitude determining subunit is used for determining a specific sound pressure amplitude corresponding to the electric energy amplitude based on the electric energy amplitude loaded to the loudspeaker unit;

or, determining an adjustment direction of the sound pressure amplitude based on the electric energy amplitude loaded to the speaker unit; the adjusting direction comprises increasing the sound pressure amplitude or decreasing the sound pressure amplitude;

and the sound pressure amplitude adjusting subunit is used for adjusting the sound pressure amplitude based on the adjusting direction according to a preset adjusting rule.

Optionally, each quantized audio digital stream may be obtained by grouping audio according to the number of rows of transducing elements in the digital speaker;

the method specifically comprises the following steps:

performing oversampling operation on the audio to obtain first digital audio data; the first digital audio data is digital audio data subjected to oversampling by R times; r is more than or equal to 0;

and grouping the second audio digital stream according to the number of the lines of the transduction elements in the digital loudspeaker to obtain a multi-path quantized audio digital stream.

Based on the same idea, the embodiment of the present specification further provides a digital speaker volume control device. Fig. 7 is a digital speaker volume control device provided by the present invention. The method can comprise the following steps:

a communication unit/interface for receiving volume adjustment instructions;

As shown in fig. 7, the terminal device may further include a communication line. The communication link may include a path for transmitting information between the aforementioned components.

Optionally, as shown in fig. 7, the terminal device may further include a memory. The memory is used for storing computer-executable instructions for implementing the inventive arrangements and is controlled by the processor for execution. The processor is used for executing the computer execution instructions stored in the memory, thereby realizing the method provided by the embodiment of the invention.

As shown in fig. 7, the memory may be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory may be separate and coupled to the processor via a communication link. The memory may also be integral to the processor.

Optionally, the computer-executable instructions in the embodiment of the present invention may also be referred to as application program codes, which is not specifically limited in this embodiment of the present invention.

In particular implementations, as one embodiment, as shown in FIG. 7, a processor may include one or more CPUs, such as CPU0 and CPU1 in FIG. 7.

In one implementation, as shown in fig. 7, a terminal device may include a plurality of processors, such as the processor in fig. 7, for example. Each of these processors may be a single core processor or a multi-core processor.

Based on the same idea, an embodiment of the present specification further provides a computer storage medium corresponding to the foregoing embodiment, where the computer storage medium stores instructions, and when the instructions are executed, the method for controlling the volume of a speaker is implemented.

The above description mainly introduces the scheme provided by the embodiment of the present invention from the perspective of interaction between the modules. It is understood that each module, in order to implement the above functions, includes a corresponding hardware structure and/or software unit for performing each function. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, with the exemplary elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The functional modules may be divided according to the above method examples, for example, the functional modules may be divided corresponding to the functions, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the embodiment of the present invention is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

The processor in this specification may also have the function of a memory. The memory is used for storing computer-executable instructions for implementing the inventive arrangements and is controlled by the processor for execution. The processor is used for executing the computer execution instructions stored in the memory, thereby realizing the method provided by the embodiment of the invention.

The memory may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via a communication link. The memory may also be integral to the processor.

The method disclosed by the embodiment of the invention can be applied to a processor or realized by the processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an ASIC, an FPGA (field-programmable gate array) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and combines hardware thereof to complete the steps of the method.

In a possible implementation manner, a computer-readable storage medium is provided, in which instructions are stored, and when the instructions are executed, the instructions are used for implementing the logical operation control method and/or the logical operation reading method in the foregoing embodiments.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the procedures or functions described in the embodiments of the present invention are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a terminal, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire or wirelessly. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, such as a floppy disk, a hard disk, a magnetic tape; or optical media such as Digital Video Disks (DVDs); it may also be a semiconductor medium, such as a Solid State Drive (SSD).

While the invention has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

While the invention has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and drawings are merely illustrative of the invention as defined by the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A volume control method of a digital loudspeaker, the method is applied to the digital loudspeaker, and is characterized by comprising the following steps:

receiving a volume adjusting instruction;

and adjusting the sound pulse energy output by the loudspeaker unit based on the electric energy signal to complete volume adjustment.

2. The method according to claim 1, wherein when the power signal is a power amplitude, the adjusting the sound pulse energy output by the speaker unit based on the power signal to complete volume adjustment includes:

3. The method according to claim 1, wherein when the electric energy signal is an electric energy action time, the adjusting the sound pulse energy output by the speaker unit based on the electric energy signal to complete volume adjustment includes:

4. The method according to claim 3, wherein before the adjusting the sound pressure amplitude of the speaker unit according to the preset second corresponding relationship between the electric energy application time and the sound pressure amplitude based on the electric energy application time, further comprising:

determining an action time range corresponding to the volume adjustment range;

5. The method according to claim 2, wherein the adjusting the sound pressure amplitude of the speaker unit according to the preset first corresponding relationship between the power amplitude and the sound pressure amplitude based on the power amplitude loaded on the speaker unit comprises:

determining a specific sound pressure amplitude corresponding to the electric energy amplitude based on the electric energy amplitude loaded on the loudspeaker unit;

6. The method of claim 1 wherein each of said quantized audio digital streams is obtained by DSR processing in terms of the number of rows of transducing elements in said digital speaker;

and performing DSR processing according to the number of the transduction element lines in the digital loudspeaker, specifically comprising:

performing oversampling operation on the audio to obtain first digital audio data; the first digital audio data is digital audio data subjected to oversampling by R times; wherein R is more than or equal to 0;

7. A digital speaker volume control device, comprising:

8. The apparatus according to claim 7, wherein when the power signal is a power acting time, the volume adjusting module specifically includes:

9. A digital speaker volume control device, comprising:

a communication unit/interface for receiving volume adjustment instructions;

10. A computer storage medium having stored thereon instructions that, when executed, implement the digital speaker volume control method of any of claims 1 to 6.