WO2014027792A1

WO2014027792A1 - Sound conversion apparatus having independent electric signal processing function

Info

Publication number: WO2014027792A1
Application number: PCT/KR2013/007159
Authority: WO
Inventors: 고영로; 이윤재; 이승연
Original assignee: 주식회사 이엠텍
Priority date: 2012-08-14
Filing date: 2013-08-08
Publication date: 2014-02-20
Also published as: KR101355136B1

Abstract

A sound conversion apparatus having an independent electric signal processing function, according to the present invention, comprises: a frame; a magnetic circuit which is installed inside the frame; a voice coil which receives an electric signal that is applied and vibrates by means of mutual electromagnetic force between the magnetic circuit; a vibration plate, which vibrates by means of the vibration of the voice coil, for generating a sound; and a sound pressure correction device, which operates by receiving power that is applied from an external electric device, for determining whether to perform a power saving function on the basis of the size of the electric signal that is applied by the external electric device, and performing the power-saving function in accordance with the determination.

Description

Acoustic transducer with independent electrical signal processing

The present invention relates to an acoustic transducer, and more particularly, to an acoustic transducer capable of independently processing an electrical signal (acoustic signal) applied from the outside.

1 is a cross-sectional view of an acoustic transducer according to the prior art.

As shown in the drawing, a general sound conversion device (speaker) includes a frame 1, a yoke 2 inserted and mounted inside the frame 1, and a yoke 2 to transmit magnetic flux or to the yoke 2; Inner ring top plate which receives magnetic flux from inner ring magnet 3 and outer ring magnet 4 receiving magnetic flux from inner ring magnet 3 or outer ring magnet 4 and transmits the magnetic flux at right angles to voice coil 7 (5) and voice coil 7 in which a portion of the outer ring top plate 6, the inner ring magnet 3 and the inner ring top plate 5, and the outer ring magnet 4 and the outer ring top plate 6 are inserted into the air gap The voice coil 7 is attached to the inside of the diaphragm 8 to generate a vibration in accordance with the vertical movement of the voice coil 7 and the sound emitting hole 11 is formed, the protector 10 to protect the diaphragm 8 ) And so on.

The lead wire of the voice coil 7 is fixed to the bottom of the diaphragm 8 using a wire bond, and penetrates the side surface of the frame 1 or forms a groove (not shown) formed in the frame 1. It is drawn out through and soldered to the terminals 14 along the outer side of the frame 1, respectively.

In addition, a damper (not shown) may be installed below the diaphragm in order to structurally hold the unidirectional vibration and prevent breakage of the lead wire of the voice coil 7 to increase the reliability of the acoustic transducer. In the application of the conventional microspeakers, the vibration of the sound source is relatively stable due to the high and mid-range, and the damper is not applied in consideration of the number of parts and the working process, but the communication technology is developed and the use of the low-frequency sound source is Increasingly, dampers are often used.

However, the conventional microspeaker module has a disadvantage in that the bass reproduction is worse because the total volume (size) is small and the sound balance is poor overall.

It is an object of the present invention to provide an acoustic transducer having an independent electric signal processing function that enables sound pressure correction / adjustment independently within the acoustic transducer.

Another object of the present invention is to provide an acoustic transducer having an independent electric signal processing function in which a sound pressure correction circuit unit (a type of chip) is installed on a PCB substrate connected to the acoustic transducer module.

In addition, the present invention is capable of applying power to the sound pressure correction circuit portion, while the sound signal has an independent electric signal processing function having an electrical configuration to be applied to the sound pressure correction circuit portion, and then processed, and then applied to the voice coil It is an object to provide an inverter.

In addition, an object of the present invention is to provide a sound converting device having an independent electric signal processing function for determining the type (analog signal, digital signal) of the input electrical signal, converts it into a digital signal that can be processed therein. do.

In addition, an object of the present invention is to provide a sound converting apparatus having an independent electric signal processing function for determining the magnitude of the input electrical signal, to control the on / off of the internal device.

The present invention is an acoustic transducer having an independent electric signal processing function is a frame, a magnetic circuit installed in the frame, a voice coil vibrating by the mutual electromagnetic force with the magnetic circuit by receiving an electric signal, the vibration by the vibration of the voice coil and sound A diaphragm that generates a light source and operates by receiving power from an external electric device, and determines whether to perform a power saving function based on the magnitude of an electric signal applied from an external electric device, and performs a power saving function according to this determination. And a calibration device.

In addition, the frame further includes an enclosure utilized as a resonance space, and the sound pressure correction circuit is preferably installed in the enclosure.

In addition, it is preferable that the sound pressure correcting apparatus performs a normal operation when the magnitude of the electrical signal is greater than or equal to the reference magnitude, and performs a power saving function when the magnitude of the electrical signal is smaller than the magnitude of the reference magnitude.

In addition, it is preferable that the sound pressure correcting apparatus checks the type of the electric signal applied from the external electric device, converts the electric signal into a preset digital signal, and processes the electric signal according to the identified type.

In addition, the sound pressure correction device includes an analog block for converting a received analog signal into a digital signal of a predetermined type, and a digital block for converting the received digital signal into a digital signal of a predetermined type, and the sound pressure correction device includes an analog block. It is desirable to selectively activate the and digital blocks.

In addition, the independent electrical signal processing method of the acoustic conversion device receives power from the external electrical device of the present invention includes the steps of receiving the electrical signal from the external electrical device, and confirming the type of the received electrical signal; And converting the signal into a digital signal of a predetermined type by performing signal processing according to the type of the electrical signal identified in the checking step.

In addition, the converting step may selectively perform an analog-to-digital conversion step of converting a received analog signal into a digital signal of a predetermined type, or a digital-digital conversion step of converting a received digital signal into a digital signal of a predetermined type. desirable.

In addition, the independent electrical signal processing method may include checking a magnitude of an electrical signal from an external electrical device, and performing a power saving function when the magnitude of the confirmed signal is smaller than the reference magnitude, and the magnitude of the confirmed signal is greater than or equal to the reference magnitude In this case, it is preferable to perform a normal signal processing function.

The present invention has the effect of enabling sound pressure correction / adjustment independently in the acoustic transducer.

In the acoustic transducer provided by the present invention, the acoustic transducer itself includes a sound pressure correction circuit, which can be miniaturized to prevent the low sound reproduction power from dropping.

In addition, the acoustic transducer provided by the present invention has the advantage that it is not necessary to provide a separate component for connecting the chip by providing a sound pressure correction circuit on the FPCB substrate for applying an electrical signal from the outside.

In addition, the acoustic transducer provided by the present invention can increase the space utilization by placing the chip in the enclosure space provided in the frame.

In addition, the present invention is possible to apply power to the sound pressure correction circuit portion, while the sound signal is applied to the sound pressure correction circuit portion is processed, and after the electrical configuration to be applied to the voice coil, it is possible to control the sound pressure itself have.

In addition, the present invention is capable of determining the type (analog signal, digital signal) of the input electrical signal, convert it into a digital signal that can be processed internally, and has an effect applicable to both electrical devices that apply analog or digital electrical signals. have.

In addition, the present invention has an effect of performing a power saving function by determining the magnitude of the input electrical signal, by adjusting the on / off of the internal device.

1 is a cross-sectional view of an acoustic transducer according to the prior art,

2 is an exploded perspective view of an acoustic transducer according to an embodiment of the present invention;

3 is a cross-sectional view of an acoustic transducer according to an embodiment of the present invention;

4 is a diagram illustrating an FPCB substrate and a sound pressure correction circuit unit provided on an FPCB substrate in an acoustic transducer according to an embodiment of the present invention;

5 is a view showing a terminal portion of the FPCB substrate provided in the acoustic transducer according to an embodiment of the present invention;

6 is a view illustrating a state in which a frame and a magnetic circuit of the acoustic transducer according to an embodiment of the present invention are combined;

7 shows an embodiment of the sound pressure correction circuit 700,

8 is a functional block diagram included in an audio processor 720,

9 is a graph showing a relationship between frequency and vibration displacement according to volume (volume);

10 is a graph of frequency characteristics according to volume.

11 is an operation flowchart of an acoustic transducer having an independent electric signal processing function.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is an exploded perspective view of an acoustic transducer according to an embodiment of the present invention, and FIG. 3 is a view of the acoustic transducer according to an embodiment of the present invention viewed from above. The acoustic transducer according to an embodiment of the present invention is provided in the frame 100, the frame 100, the magnetic circuit 200 consisting of the yoke 210, the permanent magnet 220, the top plate 230, Voice coil 300 vibrating by mutual electromagnetic force in the space between the side of the yoke 210 and the permanent magnet 220, vibrates by the vibration of the voice coil 300 to generate sound, the center diaphragm 420 and The diaphragm 400 including the side diaphragm 410, and transmits an electrical signal to the voice coil 300, and serves as a terminal that receives the electrical signal from the suspension and external terminals to hold the vibration of the diaphragm 400. The FPCB substrate 500 also serves as a protector 610 positioned at the top to protect the components of the acoustic transducer, a lower cover 620 coupled to the lower surface of the frame and protecting the components of the acoustic transducer, and the frame 100. Located on the FPCB substrate 500 Sound pressure correction circuit 700 for optimizing the acoustic characteristics of the converter device.

In the frame 100, a magnetic circuit 200 including a yoke 210, a permanent magnet 220, and a top plate 230 is provided at the center thereof. Therefore, an empty space for installing the magnetic circuit 200 is provided at the center, and an enclosure 140 (refer to FIG. 6) which is a resonance space is provided to the outside where the magnetic circuit 200 is installed. The vibration member having the voice coil 300, the vibration plate 400, and the FPCB substrate 500 attached to each other is installed on the frame 100. The voice coil 300 is attached to the lower portion of the FPCB substrate 500, and the side diaphragm 410 is attached to the voice coil 300 at a predetermined interval. In addition, a center diaphragm 420 is attached to the upper portion of the FPCB substrate 500. The suspension portion 510 (see FIG. 4), which is a portion where the voice coil 300 and the diaphragm 400 are attached to the FPCB substrate 500, is seated on the upper portion of the frame 100 and bent from the suspension portion 510. The side connection 520 (see FIG. 4) is located at the side of the frame 100. In addition, the terminal portion 530 that is bent from the side connecting portion 520 and positioned in parallel with the suspension portion 510 is mounted on the lower portion of the frame 100.

After the magnetic circuit 200 and the vibrating member are installed in the frame 100, the protector 610 is coupled to the upper portion of the frame 100, and the lower cover 620 is coupled to the lower portion of the frame 100, respectively. Protect the components installed on the

The voice coil 300 is bonded to the suspension portion 510 by soldering or the like, and attached to the suspension portion 510 by a tape or other adhesive. By the suspension part 510, the vibration of the diaphragm 400 is made only in the up and down directions, thereby preventing abnormal vibrations such as divided vibration and unidirectional vibration, thereby improving sound quality. The diaphragm 400 includes a center diaphragm 420 located at the center portion and a side diaphragm 410 positioned outside the center diaphragm 420 and formed in a ring shape. The center diaphragm 420 has a dome shape protruding upward, and the side diaphragm 410 has a dome shape protruding downward. The center diaphragm 420 is attached to the upper portion of the suspension portion 510, and the side diaphragm 410 is attached to the lower portion of the suspension portion 510.

Meanwhile, the center diaphragm 420 and the side diaphragm 410 may be made of a film of the same material or a film of a different material, as necessary. The center diaphragm 420 is made of a thermoplastic film such as PE or PP, and UV molding may be performed as necessary. In addition, the side diaphragm 410 may be manufactured by laminating thermoplastic films such as PE and PP and thermoplastic urethane films such as TPU. Since the center diaphragm 420 and the side diaphragm 410 have different sound bands, the side diaphragm 410 increases ductility and elasticity, thereby improving the acoustic characteristics of the low frequency band, and the center diaphragm 420 is light and rigid. By increasing the sound characteristics of the medium and high frequency band can be improved.

FIG. 4 is a diagram illustrating an FPCB substrate and a sound pressure correction circuit unit provided on an FPCB substrate according to an embodiment of the present invention.

The FPCB substrate 500 provided in the acoustic transducer according to an exemplary embodiment of the present invention is located on the upper surface of the frame 100 and has a suspension unit 510 and a frame to which the voice coil 300 and the diaphragm 400 are attached. The side connection portion 530 which is located on the lower surface of the 100 and connects the terminal portion 520 and the suspension portion 510 and the terminal portion 520 where the sound pressure correction circuit unit 700 is installed, and is located on the side of the frame 100. It includes.

The suspension part 510 includes a seating part 512, which is an edge part seated on the upper surface of the frame 100, a center part 514 and a seating part 512 and a center part 514 to which the diaphragm 400 under the voice coil 300 is attached. And a connection portion 516 that provides a damping effect. Electrical signals are transmitted to the voice coil 300 through the conductive pattern of the FPCB formed in the suspension unit 510. The conductive pattern of the FPCB is connected to the central portion 514 via the seating portion 512 and the connecting portion 516, and a bonding portion (not shown) that is soldered with the voice coil 300 may be provided at the central portion 514.

The terminal unit 520 is installed on the lower surface of the frame 100, and includes an installation surface 522 on which an electrical signal from the outside may install the terminal 524 and the sound pressure correction circuit unit 700. A total of four terminals 524 are formed, and the lead wires connected to the terminals 524 are a positive pole of a sound signal (electrical signal), a negative pole, and a power source (+ DC, GND / -DC). . Of course, the terminal portion 520 and the side connection portion 530 is formed of the FPCB pattern that can transmit an electrical signal, the electrical signal transmitted through the terminal 524 via the side connection portion 530 and the suspension portion 510 To be transmitted to the voice coil 300. The frame 100 is formed with a side connecting portion receiving groove 170 (see FIG. 4) into which the side connecting portion 530 is inserted, a terminal portion receiving groove 180 (see FIG. 2) into which the terminal portion 520 is inserted, and a frame ( A terminal lead-out hole 190 (refer to FIG. 2) is formed at the side surface of the terminal 100 to allow the terminal 524 to be drawn out of the frame 100. After installing the FPCB substrate 500 on the frame 100, the lower cover 620 is coupled to the lower portion of the frame 100 to protect the FPCB substrate 500 and other acoustic transducer components.

5 is a view showing a terminal portion of the FPCB substrate provided in the acoustic transducer according to an embodiment of the present invention. The terminal portion 520 of the FPCB substrate 500 includes terminals 524 at four corners, and an electrical signal is input from the terminal 524 to the sound pressure correction circuit 700, or via the sound pressure correction circuit 700.

Conductive patterns

524a, 524b, 524c, 524d, 524e, and 524f that transmit signals to the voice coil 300 are formed. Two of the

conductive patterns

524a, 524b, 524c, 524d, 524e, and 524f are

signal input patterns

524a and 524b for receiving an electric signal from an electric device in which an acoustic converter such as a mobile phone is installed.

Power supply patterns

524c and 524d, which are connected to the input of the sound pressure correction circuit unit 700 for supplying power from an electric device and become + DC and -DC / GND, and the other two are from the sound pressure correction circuit unit 700. Are the

signal output patterns

524e and 524f for outputting the signal processed by the voice coil 300 at the output of.

For electrical connection between the

signal output patterns

524e and 524f and the voice coil 300, a conductive pattern is also formed on the side connection part 530 and the suspension part 510.

6 is a diagram illustrating a state in which a frame and a magnetic circuit of the acoustic transducer according to an exemplary embodiment of the present invention are combined. In the frame 100, a magnetic circuit 200 including a yoke 210, a permanent magnet 220 (see FIG. 2), and a top plate 230 is provided at the center. Therefore, the center has an empty space for installing the magnetic circuit 200, and has a shape corresponding to the circumferential shape of the yoke 210 and includes an inner wall 110 to which the yoke 210 can be coupled. In addition, the outer wall 120 forming the outer shape of the frame 100 is formed at a predetermined distance from the inner wall 110. A plurality of ribs 130 connecting the outer wall 120 and the inner wall 110 are provided, and the space formed between the inner wall 110, the outer wall 120, and the rib 130 is an enclosure 140 which is a resonance space. Is used. Some of the enclosures 140 may allow the sound pressure correction circuit unit 700 described above to be located, so that the sound pressure correction circuit unit 700 may be integrally provided inside the sound transducer. When the sound pressure correction circuit unit 700 is integrally provided inside the acoustic transducer, the assembly is simple and the parts are easily managed. The position of the sound pressure correction circuit unit 700 may be installed anywhere on the FPCB substrate 500, but the sound pressure correction circuit unit 700 may be formed on one side of the side connection part 630 opposite to the side of the FPCB substrate 500. 100) can be easily assembled.

In addition, a seating surface 150 on which the side diaphragm 410 or the suspension part 510 or the protector 610 of the FPCB substrate 500 is mounted may be formed on an upper surface of the outer wall 120 of the frame 100. In addition, the four corners of the upper surface of the outer wall 120 of the frame 100, the projections to facilitate positioning of the side diaphragm 410, the suspension portion 510 or the protector 610 of the FPCB substrate 500 ( 160 may be formed. As described above, the side connection portion receiving groove 170 in which the side connection portion 630 of the FPCB substrate 500 is accommodated is formed on one outer surface of the outer wall 120 of the frame 100. In addition, the lower surface of the frame 100 is formed with a terminal accommodating groove 180 (see FIG. 3) into which the terminal portion 520 is inserted, and the terminal 524 is drawn out to the outside of the frame 100 on the side of the frame 100. The terminal lead-out hole 190 (refer to FIG. 3) may be formed to enable the same.

The sound pressure correction circuit unit 700 may basically use an element that performs an equalizer function and an amplification function. That is, the sound pressure correction circuit unit 700 is an element that can adjust the gain or gain value of the electrical signal input to the acoustic transducer or the output electrical signal according to the frequency or the frequency band.

In the present embodiment, the sound pressure correction circuit unit 700 and the FPCB substrate 500 are referred to as a single sound pressure correction device, which is applied to the voice coil 300 by processing an electrical signal applied from the outside to the voice coil 300. Perform the function.

FIG. 7 is an embodiment of the sound pressure correction circuit unit 700, and FIG. 8 is a functional block diagram included in the audio processor 720.

In the present embodiment, when the sound pressure correction circuit unit 700 is used as a digital speaker module, it can also be used as a receiver module. The sound pressure correction circuit unit 700 receives an electrical signal that is an input signal through the

signal input patterns

524a and 524b and converts the signal into a preset digital signal, and performs a process on the input digital signal. A signal output unit 730 for converting the digital signal processed by the audio processor 720 and the audio processor 720 into an analog signal and outputting the analog signal to the voice coil 300 through the

signal output patterns

524e and 524f; The power supply Vcc is applied through the

power supply patterns

524c and 524d from the electric device, and adjusted to at least one or more voltages (for example, 3.3V, 1.8V, etc.) used in the sound pressure correction unit 700. A power supply unit 740 for supplying necessary elements, and a setting unit 750 to perform a user setting for amplification / attenuation setting for the electrical signal input from the electrical device.

In detail, when receiving an analog signal from an electric device, the signal input unit 710 converts the received analog signal into a digital signal of a predetermined type (for example, an I2S signal, a PWM signal, etc.) (analog- The digital signal conversion block 711 and the digital signal received (e.g., PDM signal) even when the digital signal is received from the electric device are preset digital signals (e.g., I2S signal, PWM signal). And the like, a digital block (digital signal processing block) 713 for converting the received digital signal into a digital signal of a predetermined type.

The signal input unit 710 recognizes the first bit of the signal received from the electric device, checks whether the first bit includes an information flag corresponding to the PDM signal, and confirms the result to the audio processor 720. Send it. Here, when the information flag is included in the first bit, the signal input unit 710 confirms that the received signal corresponds to a digital signal, and if the information bit does not exist in the first bit, the received signal corresponds to an analog signal. 1 verification process).

In addition, the signal input unit 710 is connected to the electrical device through the

signal input patterns

524a and 524b. When a signal is input only in one of the

signal input patterns

524a and 524b (the input signal is 1). If the signal is input, the input signal can be confirmed as an analog signal, and if both signals are input in the two

signal input patterns

524a and 524b (if the input signal is two), it can also be confirmed as a digital signal (second). Confirmation process).

The signal input unit 710 applies the received electrical signal and the confirmation result of the first verification process and / or the second verification process to the audio processor 720 as data, and from the audio processor 720, the analog block 711. Receive a control command (ENABLE, DISABLE) or a control command (ENABLE, DISABLE) for the digital block 713.

The signal input unit 710 calculates the magnitude of the received electric signal (sound signal) and applies it to the audio processor 720 as data.

The audio processor 720 receives the magnitude of the signal applied from the signal input unit 710 to determine whether the magnitude of the received signal is greater than or equal to a preset reference magnitude. If the size of the received signal is greater than or equal to the predetermined reference size, it is determined that the signal is normally received. If the size of the received signal is less than the predetermined reference size, it is determined that the signal is not received and the power saving is performed. Perform the function.

In addition, in response to the signal received from the electrical device, the audio processor 720 confirms the type of the signal using one or more of the first verification process and / or the second verification process, and checks the analog block 711 or the like. One of the digital blocks 713 is selectively enabled to receive a desired kind of digital signal. In addition, the audio processor 720 may disable the analog block 711 or the digital block 713 which are not activated. This is described in detail below.

The audio processor 720 performs signal processing on the input digital signal based on the setting state of the setting unit 720 and applies the processed digital signal to the signal output unit 730. Signal processing of the audio processor 720 is described below.

Next, the signal output unit 730 receives the power Vcc from the electrical signal, or receives the power from the power supply unit 740 and boosts the DC / DC converter and the boosted power to receive the audio processor 720. A digital amplification unit for amplifying a signal applied from the digital signal to an analog signal is provided.

The power supply unit 740 receives a power supply Vcc from an electric device, and each element of the sound pressure correction unit 700 (signal input unit 710, audio processor 720, signal output unit 730, and setting unit 750). Corresponds to the means for supplying the necessary power. However, the power supply unit 740 corresponds to a technology that is easily recognized by those skilled in the art, and detailed description thereof is omitted.

As illustrated in FIG. 8, the audio processor 720 may include a band pass filter (BPF) 721 for processing a digital signal received from the signal input unit 710 based on a frequency band, and a digital signal. Volume control 723 for setting the overall gain, and when the digital signal from the volume control 723 is above a certain threshold, the digital signal is forcedly compressed to reduce the size of the signal. Dynamic Range Compression (DRC) 725 is provided.

The setting unit 750 is a first setting unit for setting a gain of each frequency band in connection with the operation of the band filter unit 721, and in connection with an operation of the dynamic range compression unit 725. And a second setting unit configured to apply a voltage corresponding to the setting.

First, the first setting unit configures, for example, three hardware pins so that the user sets the gain of each frequency band, so that a total of eight settings can be made. Table 1 below is a case of setting according to the volume (volume) of the acoustic transducer.

Table 1

Volume (cc)	Pin 1	Pin 2	Pin 3
0.3	0	0	0
0.4	0	0	One
0.5	0	One	0
0.6	0	One	One
0.7	One	0	0
0.8	One	0	One
0.9	One	One	0
1.0	One	One	One

Here, the setting '0' may correspond to 'L (low)' and the setting '1' may correspond to 'H (high)'.

By setting of the first setting unit, for example, the

1, 2, 3 (0, 0, 1) audio processor 720 recognizes that the sound conversion device is 0.4 cc.

The audio processor 720 stores a gain table for each frequency or frequency band corresponding to the setting of the first setting unit or corresponding to the volume. The band filter unit 721 may include, for example, first to eighth band filters BPF 1 to BPF 8 that process eight non-overlapping frequency bands. For example, the gain table for each frequency band at

1, 2, 3 (0, 0, 1) is shown in Table 2.

TABLE 2

Frequency filter	Frequency band	Gain (dB)
BPF 1	100-200 Hz	3
BPF 2	300-400 Hz	3
BPF 3	500-800 Hz	11
BPF 4	1KHz-1.2KHz	-6
BPF 5	1.3KHz-1.4KHz	0 (unused)
BPF 6	1.5KHz-1.7KHz	0 (unused)
BPF 7	1.8KHz-2.0KHz	0 (unused)
BPF 8	2.1KHz-2.3KHz	0 (unused)

The audio processor 720 determines a gain for each frequency band, corresponding to the setting of the first setting unit, and in accordance with the determined gain, the band filter unit 721 processes the input digital signal.

When a signal having a predetermined size (DRC reference size) or more is input, the dynamic range compression unit 725 considers the signal as noise, forcibly compresses the signal to a signal smaller than the predetermined size (DRC reference size), and then sizes the signal. It is a device that reduces. The audio processor 720 adjusts a preset DRC reference size according to a setting input from the second setting unit.

The first setting unit and / or the second setting unit described above may be formed on the outer surface of the sound pressure correction circuit unit 700 or may be mounted on the outer surface of the sound converting apparatus, so that the user may easily set the respective setting.

9 is a graph showing a relationship between frequency and vibration displacement according to volume (volume). As shown, it is confirmed that the vibration displacement of the diaphragm 400 when the volume is large (0.8 cc) is larger than the vibration displacement when the volume is small (0.4 cc, 0.3 cc, 0.2 cc).

In the graph shown, assuming that the amplitude at the resonant frequency of 0.8 cc is the maximum allowable amplitude, the smaller the volume, the higher the gain in the low frequency band or the low frequency band.

Here, the volume refers to the back volume of the enclosure, and the back volume is a space connected to the rear back hole of the acoustic transducer including the back of the diaphragm and plays a role of stiffness when the diaphragm moves.

The larger the volume (volume), the smaller the rigidity of air when the vibration plate vibrates, and the vibration force increases and the sound pressure becomes higher than when the small vibration plate vibrates in the frequency band before the resonance point. In addition, as a whole, the rigidity is lower than when the volume is small, and thus the resonance frequency is relatively lower than when the volume is small. If the volume is small, the vibration space basically vibrates smaller than the designed space in which the vibration plate can vibrate, thus leaving a relatively large vibration space. Since the vibration characteristics are different according to the size of the volume, it is necessary to set the gain of the sound pressure correction circuit unit 700 according to the volume and the frequency band so that the vibration characteristics are similar or the same.

That is, it is confirmed that gain setting for each frequency band and processing according to the setting by the first setting unit are required.

10 is a graph of frequency characteristics according to volume. Also on the frequency characteristic graph, it is confirmed that the lower the volume, the lower the sound pressure.

The sound pressure correction circuit unit 700 stores a gain table for each frequency band based on amplitude displacement data according to the volume as shown in FIG. 10, as shown in Table 2. Accordingly, the sound pressure correction circuit unit 700 processes the electrical signal (sound signal) applied from the external device according to the frequency band-specific gain table (data) corresponding to the setting of the first setting unit, and applies it to the voice coil 300. Done.

Therefore, even if the volume is finally different, the maximum vibration space that the speaker can have is used, and thus have similar acoustic characteristics.

In step S10, the signal input unit 710 receives an electrical signal (acoustic signal) from an electrical device, and applies the magnitude of the received electrical signal to the audio processor 720 as data.

In step S12, the audio processor 720 compares the magnitude of the signal received from the signal input unit 710 with a previously stored reference magnitude, and if the magnitude of the received signal is equal to or greater than the previously stored reference magnitude, step S16. If not, proceed to step S14.

In step S14, the audio processor 720 performs a power saving function because the size of the received signal is smaller than the previously stored reference size. For example, since the audio processor 720 does not need a signal output through the signal output unit 730, at least the function of the digital amplifier or the DC / DC converter is turned off. In addition, since the audio processor 720 performs a power saving function, signal processing is unnecessary, and therefore, at least one or more of the internal band filter unit 721, the volume control unit 723, and the dynamic range compression unit 725. You can also block the operation.

In operation S16, the audio processor 720 determines that a normal electric signal is received from the electric device because the received signal has a size greater than or equal to a pre-stored reference size, thereby driving a function of each preset component. For example, the audio processor 720 controls the signal output unit 730 to drive normally.

In steps S14 and S16, for example, when the electrical signal is an mp3 signal, whether the mp3 signal is an analog signal or a digital signal has the magnitude (level) of the input signal, and the magnitude is the sound pressure correction circuit section. When the 700 recognizes that mp3 driving is performed in the electric device, the magnitude of the input signal may correspond to the reference magnitude or more. Accordingly, the audio processor 720 of the sound pressure correction circuit 700 allows the output of the electrical signal to be performed by the voice coil 300. On the other hand, when the mp3 driving in the electric device is stopped, the audio processor 720 performs a power saving function so that the output of the electric signal is not performed. Even during this power saving function, the audio processor 720 allows the power to be continuously supplied so that a corresponding output is performed when the electric signal is input.

In step S18, the audio processor 720 determines whether the received electrical signal is an analog signal. In the case of determining the type of the signal, as described above, the audio processor 720 determines the type of the received signal by using the first verification process or the second verification process. If the received electrical signal is a digital signal rather than an analog signal, the process proceeds to step S20. If the received electrical signal is an analog signal, the process proceeds to step S22.

In operation S20, the audio processor 720 transmits an activation control command to the digital block 713, and transmits an inactivation control command to the analog block 711 to control the digital block 713 to operate.

In step S22, the audio processor 720 transmits an activation control command to the analog block 711, and transmits a deactivation control command to the digital block 713 to control the analog block 711 to operate.

In step S24, the audio processor 720 receives a digital signal of a preset type through the signal input unit 710, processes an electrical signal based on gain data for each frequency band, and outputs a signal as described above. The voice coil 300 is applied through the unit 730.

The power saving process of steps S12 to S16 and the signal processing process of steps S18 to S22 may be performed independently of each other, and the power saving process may also be performed during the signal processing process. May be performed.

In addition, in step S12, the previously stored reference size may be one, and preferably, the reference (first reference size) at which the audio processor 720 converts all the components to the driving state, and all the components are driven. It is also possible to independently store a criterion (second reference size) that transforms some components from the state into the blocked state. For example, the first reference size may be 0.1V and the second reference size may be 0.02V. That is, while maintaining some components in a blocked state, the audio processor 720 controls all components to be driven immediately if the magnitude of the input signal is greater than or equal to the first reference size. In addition, the audio processor 720 controls some components to be in a blocking state when it is determined that the magnitude of the input signal is less than or equal to the second reference size while all the components are maintained in the driving state. In particular, when controlling some components to a blocked state, the audio processor 720 may further limit to proceed to step S14 when the time that is maintained below the second reference size is, for example, 3 seconds or more. have. That is, the audio processor 720 performs the blocking state control in consideration of the magnitude of the signal (the magnitude of the voltage) and the holding time.

As described above, the present invention is not limited to the specific preferred embodiments described above, and any person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. It is to be understood that such changes may be made, and such changes will fall within the scope of the claims.

Claims

frame;

A magnetic circuit installed in the frame;

A voice coil receiving an electric signal and vibrating by mutual electromagnetic force with a magnetic circuit;

A diaphragm vibrating by the vibration of the voice coil and generating sound;

And a sound pressure correction device configured to operate by receiving power from an external electric device, determine whether to perform a power saving function based on the magnitude of an electric signal applied from the external electric device, and perform a power saving function according to the determination. Acoustic transducer with independent electric signal processing, characterized in that.
The method of claim 1,

The frame further includes an enclosure utilized as a resonance space,

Sound pressure correction circuit is an acoustic transducer having an independent electric signal processing function, characterized in that installed in the enclosure.
The method of claim 1,

The sound pressure correction apparatus performs a normal operation when the magnitude of the electrical signal is greater than or equal to the reference magnitude, and performs a power saving function when the magnitude of the electrical signal is smaller than the magnitude of the reference magnitude.
The method of claim 1,

The sound pressure correction device checks the type of electric signal applied from an external electric device, and converts the electric signal into a preset digital signal according to the identified type and processes the sound converting device having an independent electric signal processing function. .
The method of claim 4, wherein

The sound pressure correction device includes an analog block for converting a received analog signal into a digital signal of a predetermined type, and a digital block for converting the received digital signal into a digital signal of a predetermined type, and the sound pressure correction device includes an analog block and a digital signal. Acoustic transducer with independent electrical signal processing, characterized in that selectively activating the block.
In the independent electrical signal processing method of the acoustic converter receiving power from an external electrical device,

Receiving, by the acoustic conversion device, an electrical signal from an external electrical device;

Identifying a type of electrical signal received;

And converting the signal into a digital signal of a predetermined type by performing signal processing according to the type of the electrical signal identified in the checking step.
The method of claim 6,

The converting step may optionally include an analog-to-digital conversion step of converting a received analog signal into a digital signal of a predetermined type, or a digital-digital conversion step of converting a received digital signal into a digital signal of a predetermined type. Independent electrical signal processing method of an acoustic transducer.
The method of claim 6,

The independent electrical signal processing method includes the steps of: checking the magnitude of an electrical signal from an external electrical device;

When the size of the identified signal is smaller than the reference size, the power-saving function, and if the size of the confirmed signal is greater than the reference size, the independent signal processing method of the acoustic conversion device characterized in that for performing a normal signal processing function.