KR101698097B1 - Multimedia Apparatus with sound effect function, Sound effect apparatus and Method for applying sound effect - Google Patents

Abstract

An embodiment of the present invention provides a multimedia playback apparatus. The multimedia playback apparatus includes: storage means for storing a first filter function that adds a sound effect to an input audio signal and outputs a second filter function that adds a sound effect to the input audio signal; And a controller for driving the first filter function and the second filter function in the storage means. The first filter and the second filter may mix different sound effects to the input audio signal and sequentially output the mixed audio effect.

Description

TECHNICAL FIELD [0001] The present invention relates to a multimedia device, a sound effect generating device, and a sound effect generating method capable of generating a sound effect,

The present invention relates to an audio signal decoding or reproducing apparatus.

An audio signal decoding or reproducing apparatus is an apparatus for reproducing an input digital sound source or an analog sound source.

In order to give a stereoscopic effect to a user when such a decoding or reproducing apparatus decodes sound source contents (for example, movie, music, music video, etc.) and outputs sound, a surround concept is applied. Particularly, stereoscopic feeling has been provided mainly on the sound field effect of the left and right channels.

Furthermore, various efforts have been made to output sound by adding various sound effects to a sound source. However, no effective apparatus for providing various sound effects has been provided.

Accordingly, it is an object of the present invention to provide a multimedia apparatus, an audio signal reproducing apparatus, and a method capable of effectively providing various sound effects.

In order to achieve the above object, an embodiment of the present invention provides a multimedia playback apparatus. The multimedia playback apparatus includes: storage means for storing a first filter function that adds a sound effect to an input audio signal and outputs a second filter function that adds a sound effect to the input audio signal; And a controller for driving the first filter function and the second filter function in the storage means. The first filter and the second filter may mix different sound effects to the input audio signal and sequentially output the mixed audio effect.

The control unit may operate the first filter and the second filter sequentially in time.

The control unit may start the operation of the second filter without completing the operation of the first filter when receiving the request for the sound effect different from the sound effect of the first filter during the operation of the first filter.

The output of the first filter may be used prior to the output of the second filter for a predetermined time even if the operation of the second filter is started.

When the control unit is requested to perform a sound effect different from the sound effect of the first filter during the operation of the first filter, the first filter and the second filter may be simultaneously driven for a predetermined time.

According to another aspect of the present invention, there is provided a sound effect generating apparatus for achieving the above object. The sound effect generating apparatus includes a first filter for adding a sound effect to an input audio signal and outputting the sound effect; And a second filter for adding a sound effect to the input audio signal and outputting the sound effect. The first filter and the second filter may mix different sound effects to the input audio signal and sequentially output them. The first filter and the second filter may operate sequentially in time.

When the first filter is requested to receive a sound effect different from the sound effect of the first filter, the operation of the second filter can be started without completing the operation of the first filter. The output of the first filter may be used prior to the output of the second filter for a predetermined time even if the operation of the second filter is started.

When the first filter and the second filter are requested to be different from the sound effect of the first filter during operation of the first filter, the first filter and the second filter may be simultaneously driven for a predetermined time.

According to another aspect of the present invention, there is provided a method for generating a sound effect. The method of generating a sound effect includes: driving a first filter for a first sound effect; And when the second sound effect is requested, starting the operation of the second filter for the second sound effect while maintaining the driving of the first filter for a predetermined time. Here, the output of the first filter may be used for the predetermined time. The method may further include stopping the operation of the first filter after the predetermined time.

The present invention provides a multimedia device, an audio signal reproducing apparatus, and a method capable of effectively providing various sound effects. In order to provide various sound effects, the present invention does not use a large number of filters unlike the prior art, thereby preventing unnecessary resources from being wasted and also preventing an increase in power consumption.

In addition, according to the present invention, noise is not generated and no time delay problem occurs when switching from a driving sound effect to another sound effect.

1 is a block diagram showing a configuration of an audio signal reproducing apparatus according to the present invention.
FIG. 2 is a block diagram of a sound effect unit 115 of FIG. 1 according to an embodiment of the present invention, and FIG. 3 is a block diagram of the filter of FIG.
FIG. 4 is a block diagram of a sound effect unit 115 of FIG. 1 according to another embodiment of the present invention.
FIG. 5 is an exemplary diagram showing an exemplary operation of the sound effect unit shown in FIG. 4, and FIG. 6 is a flowchart illustrating an exemplary operation of the sound effect unit shown in FIG.
FIG. 7 is a block diagram of a sound effect unit 115 of FIG. 1 according to another embodiment of the present invention, and FIG. 8 is an exemplary diagram illustrating an exemplary operation of the sound effect unit shown in FIG.
FIG. 9 is a block diagram showing an audio signal reproducing apparatus shown in FIG. 1 implemented as a controller of a video display device, and FIG. 10 is a detailed block diagram of a controller.
11 is a block diagram showing that the audio signal reproducing apparatus shown in FIG. 1 is embodied as a control unit of the mobile terminal 1000. FIG.
FIG. 12 is a block diagram showing that the audio signal reproducing apparatus shown in FIG. 1 is implemented by a combination of the storage means 3100 and the controller 3200 of the multimedia device 3000.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. It is also to be understood that the technical terms used herein are to be interpreted in a sense generally understood by a person skilled in the art to which the present invention belongs, Should not be construed to mean, or be interpreted in an excessively reduced sense. Further, when a technical term used herein is an erroneous technical term that does not accurately express the spirit of the present invention, it should be understood that technical terms that can be understood by a person skilled in the art are replaced. In addition, the general terms used in the present invention should be interpreted according to a predefined or prior context, and should not be construed as being excessively reduced.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term "comprising" or "comprising" or the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

Furthermore, suffixes "module" and " part "for components used in the present specification are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

Furthermore, terms including ordinals such as first, second, etc. used in this specification can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to like or similar elements throughout the several views, and redundant description thereof will be omitted.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention, and should not be construed as limiting the scope of the present invention with reference to the accompanying drawings.

1 is a block diagram showing a configuration of an audio signal reproducing apparatus according to the present invention.

(Or an audio signal decoding apparatus) 100 includes an audio decoder 101, an audio phase shifting unit 103, a crosstalk reducing unit 105, a subband analyzing unit 107, a phase adjusting unit 109 A gain adjusting unit 111, a sub-band combining unit 113, and a sound effect unit 115. [

The audio decoder 101 may include various decoders for decoding audio signals encoded in various manners.

For example, if the audio signal is an encoded audio signal, it can be decoded. Specifically, when the audio signal is an MPEG-2 standard encoded audio signal, it can be decoded by the MPEG-2 decoder. In addition, if the audio signal is an encoded audio signal of the MPEG 4 BSAC (Bit Sliced Arithmetic Coding) standard according to a terrestrial DMB (Digital Multimedia Broadcasting) scheme, it can be decoded by an MPEG 4 decoder. Also, if the audio signal is an audio signal encoded according to the AAC (Advanced Audio Codec) standard of MPEG 2 according to the satellite DMB scheme or DVB-H, it can be decoded by the AAC decoder. Further, if the audio signal is a Dolby AC-3 standard encoded audio signal, it can be decoded by an AC-3 decoder.

The sound localization unit 103 controls the sound localization for the input decoded audio signal. Here, the sound image localization means a position of a perceptually sensed sound image. For example, for stereo audio signals of the left and right channels, if the audio signals of the respective channels are the same, the sound localization may be the middle of the left and right speakers.

The method of orienting the sound image is to position the sound source at a specific position (specific direction) in the sound field space based on, for example, the phase difference (time difference) of the audio signal reaching each ear of the listener and the level ratio I can make you feel.

For such sound level control, in the embodiment of the present invention, head-related transfer function filtering can be used for the input decoded audio signal.

The HRTF refers to a transfer function between a sound wave from a sound source having an arbitrary position and a sound wave reaching the eardrum of the ear, By inserting a microphone into the microphone and measuring the impulse response of the audio signal at a particular angle.

Such a head transfer function (HRTF) varies depending on the azimuth and altitude of the sound source. It may also vary depending on physical characteristics such as the listener's head shape, head size or ear shape.

On the other hand, in the embodiment of the present invention, the head transfer function may be variable.

Head-related transfer function (HRTF) filtering can be performed on a mono-channel basis. For example, a mono channel audio signal may be convoluted with an impulse response to a first head transfer function and an impulse response to a second head transfer function, respectively, to generate a left audio signal and a right audio signal. As a result, sound image localization can be performed.

On the other hand, when a multi-channel audio signal is input, HRTF filtering is performed for each channel, and a left audio signal and a right audio signal are generated, respectively, and finally, they are summed and output.

The cross-talk canceler 105 performs signal processing for reducing the crosstalk of the audio signal subjected to the image-localization control. That is, an additional audio signal for erasing the sound can be emitted in order to prevent a sound emitted from reaching the left ear and arriving at the right ear, thereby making it impossible to recognize the direction of the virtual sound source (crosstalk phenomenon) .

For example, the crosstalk canceling unit 105 may add a plurality of reverberation components having a delay time to the difference signal between the audio signal of the right channel and the audio signal of the left channel.

Accordingly, the left audio signal and the right audio signal which have passed through the crosstalk reduction unit 105 are heard only by the corresponding ears (left ear and right ear) of the listener.

On the other hand, the signal processing for crosstalk reduction is performed based on the time domain, but it is not limited thereto, and it is also possible to perform based on the frequency domain.

On the other hand, the crosstalk reducing section 105 may be optionally provided. That is, it is also possible to directly input the left audio signal and the right audio signal output from the image positioning unit 103 to the subband analyzing unit 107.

The subband analysis unit 107 performs subband analysis filtering on the audio signal subjected to the image-localization control. That is, a subband analysis filter bank is provided to convert the audio signal, which is subjected to the image phase-normalization control, into a frequency signal. The subband of the audio signal filtered by the subband analyzer 107 may be 32 subbands or 64 subbands.

The audio signal classified according to the frequency bands may be subjected to phase adjustment or gain adjustment for each frequency band or frequency band group in the phase adjuster 109 and the gain adjuster 111 described below.

The frequency dependent phase controller 109 adjusts the phase of each of the frequency bands separated on a band-by-band basis. This phase adjustment can be performed based on the detected depth information or the variation amount of the depth. It is preferable to increase the phase as the detected depth is larger or the variation amount of the depth is larger. It is possible to increase the phase to the upper limit value. On the other hand, when there is little depth or when there is little variation in depth, i.e., less than a predetermined value, the phase adjustment may not be performed.

For example, when the phase of an audio signal of a predetermined frequency is increased by 1800, it can be understood that the audio signal is further projected in the user direction.

The phase adjustment method can be performed in various ways. For example, it is possible to change the sign between channels by dividing the band or band only for a certain frequency range, to change the sign between channels by grouping them for a specific frequency range, to adjust the phase between the channels independently in all frequency bands, You can adjust the phase between channels by dividing bands or bands for specific frequency ranges, or you can group them for specific frequency ranges to adjust the phase between channels.

A frequency dependent gain controller 111 adjusts gain for each of the frequency bands separated for each band.

The gain adjustment method can be performed in various ways. For example, gain can be adjusted independently for all frequency bands, gain can be adjusted by dividing bands or bands only for specific frequency ranges, or groups can be grouped for specific frequency ranges to control gain for each group.

For example, if the frequency band is 1000 Hz to 4000 Hz, the gain can be adjusted and the gain can not be adjusted in other frequency bands.

The subband synthesis unit 113 subband-synthesizes and filters an audio signal whose phase or gain is adjusted for each frequency band. That is, a subband synthesis filter bank is provided to synthesize subbands divided into four subbands or 64 subbands. Accordingly, the audio signal finally subjected to the sound phase normalization, phase adjustment, gain adjustment, and the like is output.

Although not shown in the drawing, it is also possible that a channel separator is provided between the audio decoder 101 and the sound image localizer 103.

The channel separating unit separates the input audio signal for each channel. For example, the audio signal can be divided into a rear channel and a front channel. The rear channel may be an audio signal output from the rear side, and the front channel may be an audio signal output from the front side. It is also possible to divide it into 5.1 channels or the like, or to divide it into a left channel and a right channel in the case of stereo.

Meanwhile, the sound effect unit 115 adds various sound effects to the audio signal on which the sound phase localization, phase adjustment, gain adjustment, and the like have been performed. The sound effect refers to the intelligibility of the sound, the urge, the splash state, the reverberation, the three-dimensional feeling, and the like when the sound sounds in a certain space. Such a sound effect can give a sound effect in a theater, a concert hall, a study, or a cave, for example. In addition, the sound effect may perform an equalizer function in addition to sounding the sound in a certain space. The equalizer function is to amplify or reduce the sound of a specific frequency band. For example, when the audio signal is about news, it can amplify the human voice frequency band and reduce the other part. Or when the audio signal is about a movie, the sound of the low frequency band can be amplified so that the user feels grandiose. In addition, when the audio signal is music, a specific frequency band may be amplified according to various genres such as pop, classical, and rock. Various filters may be used as shown in FIG. 2 in order to generate a sound effect.

The audio signal reproducing apparatus 100 shown in FIG. 1 may be implemented by a software program or codes other than hardware, and may be implemented by a video reproducing apparatus 1000 of FIG. 9 and a mobile terminal 2000 of FIG. As shown in FIG.

FIG. 2 is a block diagram of a sound effect unit 115 of FIG. 1 according to an embodiment of the present invention, and FIG. 3 is a block diagram of the filter of FIG.

As can be seen with reference to FIG. 2, the sound effect unit 115 includes a plurality of filters and a multiplexer to provide various sound effects. Each of the filters generates a different sound effect (or sound field). For example, the first sound effect filter may be configured for a reverberation effect in the concert hall, and the second sound effect filter may be configured for a reverberation effect in the cave. In addition, each filter is configured to provide a reverberation effect in any one of a soundproof room, a bathroom, a living room, a stone room, an auditorium, a stadium, a hangar, a carpeted corridor, a corridor, a forest, a city, a mountain, a quarry, Lt; / RTI >

The filter may include a primary reflection sound generator, a secondary reflection sound generator, and an echo generator, as shown in FIG. The primary reflection sound generator 32 generates a sound effect by reflecting the wall surface at the time of reproduction of the sound source data, and exhibits different sound field effects according to a predetermined function and a coefficient value for filtering the audio signal.

The first-order reflec- tive generator filters the audio signal using a predetermined function and a coefficient value, mixes the audio signal with the second input audio signal, and outputs the mixed signal.

The secondary reflection sound generator generates a sound source in which the sound is reflected by various obstacles and the effect of attenuation is fed back to the listener.

The secondary reflection sound generator filters a part of the audio signal output from the primary reflection sound generator using a predetermined function and a coefficient value, and then feeds back the mixed audio signal to another part of the audio signal.

The echo generator mixes reverberation components randomly through a first-order reflec- tor generator and an audio signal output through a second-order reflec- tor generator using a predetermined function and a coefficient, thereby generating an echo as if the sound source is reproduced in an actual place.

The filter including the above-described primary reflection sound generator, secondary reflection sound generator, and echo generator can be implemented as a software program or codes. In addition, the sound effect unit 115 including the filter and the multiplex may be implemented as a software program or codes.

However, since only one sound effect is output at a time instead of outputting the sound effects at the same time, in FIG. 2, only one of the outputs from the plurality of filters is used by using the multiplexer Finally output.

As described above, in order to provide various sound effects, it is necessary to use a plurality of filters. However, when a plurality of filters are used, unnecessary resources are used. This increases power consumption.

Unlike FIG. 2, there is a method of selecting one of a plurality of filters by using a switch, but there is a disadvantage that noises are put on the sound by the switch. Or when the sound effect is switched to another, the delay is generated by the switch.

FIG. 4 is a block diagram of a sound effect unit 115 of FIG. 1 according to another embodiment of the present invention.

As shown in FIG. 4, the sound effect unit 115 may include two sound effect filters, unlike FIG. The sound effect unit 115 including the filter may be implemented with a software program or codes.

The sound effect unit 115 shown in FIG. 4 is proposed in order to solve a time delay problem and a resource problem that arise from the configuration of the sound effect unit shown in FIG.

As shown in FIG. 3, each sound effect filter has the same structure and, as described above, in consideration of using only one filter among various sound effect filters at a time, the sound effect part 115 May use only at least two sound effect filters.

The at least two sound effect filters may be used sequentially. For example, when the sound effect first filter is in use, the sound effect second filter may be in a standby state for operation. More specifically, when the sound effect first filter is operating to generate a reverberation effect in the cave, the sound effect second filter may be on standby to generate a reverberation effect in the concert hall. And, if the echo effect at the concert hall is commanded to be used, the operation of the acoustic effect second filter can be initiated. When the operation of the sound effect second filter is started, the sound effect first filter may be queued to generate another echo effect.

As described in the above example, by sequentially using two sound effect filters, various sound effects can be obtained. A more detailed description of the operation will be described with reference to FIG.

FIG. 5 is an exemplary diagram showing an exemplary operation of the sound effect unit shown in FIG. 4, and FIG. 6 is a flowchart illustrating an exemplary operation of the sound effect unit shown in FIG.

As can be seen from FIG. 5, the two sound effect filters are operated in sequence, but both the first filter and the second filter are operated for stabilization for a predetermined time, and only the output of one filter is used .

For example, when the sound effect first filter is used in FIG. 5 and the command for using the second filter is received, the operation of the first filter is maintained for a predetermined time, for example, . The operation of the second filter is started for the predetermined time, for example t1, but the output of the second filter may not be used. The reason why the output of the second filter is not used for the time t1 even if the operation of the second filter is started is that the output of the second filter is not stabilized as soon as the operation of the second filter is started .

Further, in order for the second filter to generate a predetermined acoustic effect, a predetermined filter coefficient is required. Thus, when the first filter is in operation and the operation of the second filter is requested, the second filter acquires the coefficient for the predetermined sound effect for the time t1 and starts the operation. When the stabilization is completed after the time t1, the second filter starts operating, and the first filter stops operating.

On the other hand, if a request for another sound effect is received while the second filter is operating, the first filter obtains a filter coefficient for the other sound effect for t2, and prepares for starting the operation of the first filter. The second filter maintains the output until the first filter is stabilized for the time t2. When the time t2 elapses, the second filter stops operating, the first filter operates, and an audio signal is output from the first filter.

Referring to FIG. 6, after driving the first filter for the first sound effect (S110), when the request for the second sound effect is received, while the driving of the first filter is maintained for a predetermined time, The operation of the second filter is started for the second sound effect (S120). The output of the first filter is used for the predetermined time, and the output of the second filter is used after the predetermined time (S130).

The operations described so far can be implemented in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

FIG. 7 is a block diagram of a sound effect unit 115 of FIG. 1 according to another embodiment of the present invention, and FIG. 8 is an exemplary diagram illustrating an exemplary operation of the sound effect unit shown in FIG.

7, according to another embodiment of the present invention, the sound effect unit 115 may include a sound effect first filter, a sound effect second filter, and a multiplexer .

The first filter may use filter coefficients 1, 3, 5, for example, and the second filter may use filter coefficients 2, 4, for example. The filter coefficients 1,2,3,4,5 are coefficients for different sound effects. The filter coefficients 1 to 5 are input to the respective filters when receiving the respective sound effect requests.

The outputs of the first and second filters are selected using only one of the stable outputs using the multiplexer.

For example, as shown in FIG. 8, when a request for a first sound effect is received, 1 is input to the first filter as the filter coefficient, and the first filter has a first sound effect And outputs the applied audio signal 1. Then, when a request for a second sound effect is received, 2 is input to the second filter as the filter coefficient, and the second filter outputs the audio signal 2 to which the second sound effect is applied in accordance with the filter coefficient 2.

When the audio signal 1 and the audio signal 2 are output in this manner, the multiplexer can select and output only a stable signal.

Up to this point, the configuration and operation of the sound effect unit 115 have been described according to various embodiments of the present invention. However, the scope of protection of the present invention is not limited to these operations, and operations that can be easily obtained by those skilled in the art by way of the illustrative configuration should also be construed as being included in the scope of protection of the present invention.

In the above description, the audio signal reproducing apparatus is used alone, but the audio signal reproducing apparatus may be implemented as a component of the video display apparatus shown in FIG. This will be described with reference to FIG.

FIG. 9 is a block diagram showing an audio signal reproducing apparatus shown in FIG. 1 implemented as a controller of a video display device, and FIG. 10 is a detailed block diagram of a controller.

9, an image display apparatus 1000 according to an exemplary embodiment of the present invention includes a tuner 1100, a demodulator 12000, an external device interface 1300, a network interface 1350, a storage unit A user input interface unit 1500, a control unit 1700, a display 1800, an audio output unit 1850, and a 3D viewing device 1950.

The tuner 1100 selects an RF broadcast signal corresponding to a channel selected by the user or all previously stored channels among RF (Radio Frequency) broadcast signals received through the antenna. Also, the selected RF broadcast signal is converted into an intermediate frequency signal, a baseband image, or a voice signal.

For example, if the selected RF broadcast signal is a digital broadcast signal, it is converted into a digital IF signal (DIF). If the selected RF broadcast signal is an analog broadcast signal, it is converted into an analog baseband image or an audio signal (CVBS / SIF). That is, the tuner 1100 can process a digital broadcast signal or an analog broadcast signal. The analog baseband image or audio signal (CVBS / SIF) output from the tuner 1100 can be directly input to the controller 1700. [

The tuner 1100 can receive an RF broadcast signal of a single carrier according to an Advanced Television System Committee (ATSC) scheme or an RF broadcast signal of a plurality of carriers according to a DVB (Digital Video Broadcasting) scheme.

In the present invention, the tuner 1100 sequentially selects RF broadcast signals of all broadcast channels stored through a channel memory function among RF broadcast signals received through an antenna, and outputs the selected RF broadcast signals as an intermediate frequency signal, a baseband image, or an audio signal Can be converted.

The demodulator 12000 receives the digital IF signal DIF converted by the tuner 1100 and performs a demodulation operation.

For example, when the digital IF signal output from the tuner 1100 is the ATSC scheme, the demodulator 12000 performs 8-VSB (7-Vestigal Side Band) demodulation. Also, the demodulator 12000 may perform channel decoding. The demodulator 12000 includes a trellis decoder, a de-interleaver, and a Reed Solomon decoder for performing trellis decoding, deinterleaving, and lead decoding. Solomon decoding can be performed.

For example, when the digital IF signal output from the tuner 1100 is a DVB scheme, the demodulator 12000 performs CODDMA (Coded Orthogonal Frequency Division Modulation) demodulation. Also, the demodulator 12000 may perform channel decoding. To this end, the demodulator 12000 may include a convolution decoder, a deinterleaver, and a reed-solomon decoder to perform convolutional decoding, deinterleaving, and reed solomon decoding.

The demodulator 12000 may perform demodulation and channel decoding and then output a stream signal TS. At this time, the stream signal may be a signal in which a video signal, an audio signal, or a data signal is multiplexed. For example, the stream signal may be an MPEG-2 TS (Transport Stream) multiplexed with an MPEG-2 standard video signal, a Dolby AC-3 standard audio signal, or the like. Specifically, the MPEG-2 TS may include a header of 4 bytes and a payload of 184 bytes.

Meanwhile, the demodulator 12000 described above can be separately provided according to the ATSC scheme and the DVB scheme. That is, it can be provided as an ATSC demodulation unit and a DVB demodulation unit.

The stream signal output from the demodulation unit 12000 may be input to the control unit 1700.

The control unit 1700 performs demultiplexing, video / audio signal processing, and the like, and then outputs an image to the display 1800 and outputs audio to the audio output unit 1850.

The external device interface unit 1300 can transmit or receive data with the connected external device. To this end, the external device interface unit 1300 may include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

The external device interface unit 1300 can be connected to an external device such as a DVD (Digital Versatile Disk), a Blu ray, a game device, a camera, a camcorder, a computer (notebook) The external device interface unit 1300 transmits external video, audio or data signals to the control unit 1700 of the video display device 1000 through the connected external device. Also, the control unit 1700 can output the processed video, audio, or data signal to the connected external device. To this end, the external device interface unit 1300 may include an A / V input / output unit (not shown) or a wireless communication unit (not shown).

A / V input / output unit includes a USB terminal, a CVBS (Composite Video Banking Sync) terminal, a component terminal, an S-video terminal (analog), a DVI (Digital Visual Interface) terminal, an HDMI (High Definition Multimedia Interface) terminal, an RGB terminal, a D-SUB terminal, and the like.

The wireless communication unit can perform short-range wireless communication with other electronic devices. The image display apparatus 1000 may include a communication unit such as Bluetooth, Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), ZigBee, DLNA (Digital Living Network Alliance) Depending on the standard, it can be networked with other electronic devices.

Also, the external device interface unit 1300 may be connected to various set-top boxes via at least one of the various terminals described above to perform input / output operations with the set-top box.

On the other hand, the external device interface unit 1300 can transmit and receive data to and from the 3D viewing device 1950.

The network interface unit 1350 provides an interface for connecting the video display apparatus 1000 to a wired / wireless network including the Internet network. The network interface unit 1350 may include an Ethernet terminal or the like for connection to a wired network and may be a WLAN (Wireless LAN) (Wi-Fi), Wibro (Wireless) broadband), Wimax (World Interoperability for Microwave Access), and HSDPA (High Speed Downlink Packet Access) communication standards.

The network interface unit 1350 can receive, via the network, content or data provided by the Internet or a content provider or a network operator. That is, it can receive contents and related information such as movies, advertisements, games, VOD, broadcasting signals, etc., provided from the Internet, a content provider, and the like through a network. In addition, the update information and the update file of the firmware provided by the network operator can be received. It may also transmit data to the Internet or a content provider or network operator.

The network interface unit 1350 is connected to, for example, an IP (Internet Protocol) TV and receives a video, audio or data signal processed in the settop box for IPTV so as to enable bidirectional communication, And can transmit signals processed by the control unit 1700 to the IPTV set-top box.

Meanwhile, the IPTV may include ADSL-TV, VDSL-TV, FTTH-TV and the like depending on the type of the transmission network. The IPTV may include a TV over DSL, a video over DSL, a TV over IP BTV), and the like. In addition, IPTV may also mean an Internet TV capable of accessing the Internet, or a full browsing TV.

The storage unit 1400 may store a program for each signal processing and control in the control unit 1700, or may store signal-processed video, audio, or data signals.

In addition, the storage unit 1400 may perform a function for temporarily storing video, audio, or data signals input to the external device interface unit 1300. In addition, the storage unit 1400 can store information on a predetermined broadcast channel through a channel memory function such as a channel map.

The storage unit 1400 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (for example, SD or XD memory) RAM, ROM (EEPROM, etc.), and the like. The video display apparatus 1000 can reproduce and provide a file (a moving image file, a still image file, a music file, a document file, etc.) stored in the storage unit 1400 to a user.

FIG. 9 shows an embodiment in which the storage unit 1400 is provided separately from the control unit 1700, but the scope of the present invention is not limited thereto. The storage unit 1400 may be included in the control unit 1700.

The user input interface unit 1500 transmits a signal input by the user to the control unit 1700 or a signal from the control unit 1700 to the user.

For example, the user input interface unit 1500 may be configured to turn on / off the power, select the channel, and display the screen from the remote control device 2000 according to various communication methods such as a radio frequency (RF) communication method and an infrared Or transmit a signal from the control unit 1700 to the remote control apparatus 2000. The remote control apparatus 2000 can also receive a user input signal,

Also, for example, the user input interface unit 1500 can transmit a user input signal input from a local key (not shown) such as a power key, a channel key, a volume key, and a set value to the control unit 1700.

For example, the user input interface unit 1500 may transmit a user input signal input from a sensing unit (not shown) that senses a user's gesture to the control unit 1700, or may output a signal from the control unit 1700 (Not shown). Here, the sensing unit (not shown) may include a touch sensor, an audio sensor, a position sensor, an operation sensor, and the like.

The control unit 1700 demultiplexes the input stream or processes the demultiplexed signals through the tuner 1100 or the demodulation unit 12000 or the external device interface unit 1300 to generate a signal for video or audio output Can be generated and output.

The image signal processed by the controller 1700 is input to the display 1800 and can be displayed as an image corresponding to the image signal. Also, the video signal processed by the controller 1700 can be input to the external output device through the external device interface 1300.

The audio signal processed in the control unit 1700 may be output to the audio output unit 1850 as an audio signal. In addition, the audio signal processed by the control unit 1700 can be input to the external output device through the external device interface unit 1300.

10, the control unit 1700 according to an embodiment of the present invention may include an audio processing unit 100 in which the audio signal reproducing apparatus 100 described in FIG. 1 is implemented as a component have. The control unit 1700 may include a demultiplexing unit 210, an image processing unit 220, an OSD generating unit 240, a mixer 245, a frame rate converting unit 250, and a formatter 260 have. In addition, it may further include a data processing unit (not shown).

The demultiplexer 210 demultiplexes the input stream. For example, when an MPEG-2 TS is input, it can be demultiplexed into video, audio, and data signals, respectively. The stream signal input to the demultiplexer 210 may be a stream signal output from the tuner 1100 or the demodulator 12000 or the external device interface 1300.

The image processing unit 220 may perform image processing of the demultiplexed image signal. To this end, the image processing unit 220 may include an image decoder 225 and a scaler 235.

The video decoder 225 decodes the demultiplexed video signal and the scaler 235 performs scaling so that the resolution of the decoded video signal can be output from the display 1800.

The video decoder 225 may include a decoder of various standards. For example, the video decoder 225 may include at least one of an MPEG-2 decoder, an H.264 decoder, an MPEC-C decoder (MPEC-C part 3), an MVC decoder, and an FTV decoder.

In addition, the control unit 1700 can control the overall operation in the video display device 1000. [ For example, the controller 1700 may control the tuner 1100 to control the tuner 1100 to select an RF broadcast corresponding to a channel selected by the user or a previously stored channel.

The control unit 1700 may control the image display apparatus 1000 according to a user command or an internal program input through the user input interface unit 1500.

For example, the controller 1700 controls the tuner 1100 to input a signal of a selected channel according to a predetermined channel selection command received through the user input interface unit 1500. Then, video, audio, or data signals of the selected channel are processed. The control unit 1700 can output the video or audio signal processed by the user through the display 1800 or the audio output unit 1850 together with the channel information selected by the user.

The control unit 1700 may be connected to an external device input through the external device interface unit 1300, for example, a camera or a camcorder, according to an external device video reproducing command received through the user input interface unit 1500 So that the video signal or the audio signal of the display unit 1800 or the audio output unit 1850 can be outputted.

On the other hand, the control unit 1700 can control the display 1800 to display an image. For example, the broadcast image input through the tuner 1100, the external input image input through the external device interface unit 1300, the image input through the network interface unit 1350, or the image stored in the storage unit 1400 May be displayed on the display 1800.

At this time, the image displayed on the display 1800 may be a still image or a moving image, and may be a 2D image or a 3D image.

On the other hand, the control unit 1700 generates a 3D object for a predetermined object among the images displayed on the display 1800, and displays the 3D object. For example, the object may be at least one of a connected web screen (newspaper, magazine, etc.), EPG (Electronic Program Guide), various menus, widgets, icons, still images, moving images, and text.

Such a 3D object may be processed to have a different depth than the image displayed on the display 1800. [ Preferably, the 3D object may be processed so as to be projected relative to the image displayed on the display 1800.

On the other hand, the control unit 1700 recognizes the position of the user based on the image photographed from the photographing unit (not shown). For example, the distance (z-axis coordinate) between the user and the image display apparatus 1000 can be grasped. In addition, the x-axis coordinate and the y-axis coordinate in the display 1800 corresponding to the user position can be grasped.

Although not shown in the drawing, a channel browsing processing unit for generating a channel signal or a thumbnail image corresponding to an external input signal may be further provided. The channel browsing processing unit receives the stream signal TS output from the demodulating unit 12000 or the stream signal output from the external device interface unit 1300 and extracts an image from the input stream signal to generate a thumbnail image . The generated thumbnail image can be directly or encoded and input to the controller 1700. In addition, the generated thumbnail image may be encoded in a stream format and input to the controller 1700. The control unit 1700 can display a thumbnail list having a plurality of thumbnail images on the display 1800 using the inputted thumbnail images. At this time, the thumbnail list may be displayed in a simple viewing manner displayed on some areas in a state in which a predetermined image is displayed on the display 1800, or in a full viewing manner displayed in most areas of the display 1800. [ The thumbnail images in the thumbnail list can be sequentially updated.

The display 1800 converts a video signal, a data signal, an OSD signal, a control signal processed in the control unit 1700 or a video signal, a data signal, and a control signal received from the external device interface unit 1300, .

The display 1800 may be a PDP, an LCD, an OLED, a flexible display, or the like. In particular, according to an embodiment of the present invention, a three-dimensional display (3D display) is preferably available.

The display 1800 for viewing three-dimensional images can be divided into an additional display mode and a single display mode.

The single display method can implement a 3D image only by the display 1800 without a separate additional display, for example, glass, and examples thereof include a lenticular method, a parallax barrier, and the like Various methods can be applied.

Meanwhile, the additional display method can implement a 3D image using an additional display in addition to the display 1800. For example, various methods such as a head mount display (HMD) type and a glasses type can be applied. In addition, the glasses type can be further divided into a passive type such as a polarizing glasses type and an active type such as a shutter glass type. On the other hand, head-mounted display type can be divided into a passive type and an active type.

In the practice of the present invention, 3D glasses are mainly described by an additional display for 3D 1950 for stereoscopic viewing. The glass 1950 for 3D may include a passive polarizing glass or an active shutter glass, and is described as a concept including the head mount type described above.

Meanwhile, the display 1800 may be configured as a touch screen and used as an input device in addition to the output device.

The audio output unit 1850 receives a signal processed by the control unit 1700, for example, a stereo signal, a 3.1 channel signal, or a 5.1 channel signal, and outputs it as a voice. The audio output unit 1850 may be implemented by various types of speakers.

Meanwhile, in order to detect a user's gesture, a sensing unit (not shown) having at least one of a touch sensor, a voice sensor, a position sensor, and an operation sensor may be further included in the image display apparatus 1000 have. A signal sensed by a sensing unit (not shown) is transmitted to the control unit 1700 through the user input interface unit 1500.

The control unit 1700 can detect the gesture of the user by combining the images captured by the photographing unit (not shown) or the signals sensed by the sensing unit (not shown).

The remote control apparatus 2000 transmits the user input to the user input interface unit 1500. For this purpose, the remote control device 2000 can use Bluetooth, RF (radio frequency) communication, infrared (IR) communication, UWB (Ultra Wideband), ZigBee, or the like. The remote control apparatus 2000 can receive the video, audio, or data signal output from the user input interface unit 1500 and display it on the remote control apparatus 2000 or output it.

The image display apparatus 1000 described above can be applied to a digital broadcasting of ATSC system (7-VSB system), digital broadcasting of DVB-T system (COFDM system), digital broadcasting of ISDB-T system (BST-OFDM system) And a digital broadcasting receiver capable of receiving at least one of the digital broadcasting signals. In addition, as a portable type, digital terrestrial DMB broadcasting, satellite DMB broadcasting, ATSC-M / H broadcasting, DVB-H broadcasting (COFDM broadcasting), MediaFoward Link Only And a digital broadcasting receiver capable of receiving at least one of digital broadcasting and the like. It may also be a digital broadcast receiver for cable, satellite communications, or IPTV.

Meanwhile, the video display device described in the present specification can be applied to a TV set, a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player) .

Meanwhile, a block diagram of the image display apparatus 1000 shown in FIG. 9 is a block diagram for an embodiment of the present invention. Each component of the block diagram can be integrated, added, or omitted according to the specifications of the image display apparatus 1000 actually implemented. That is, two or more constituent elements may be combined into one constituent element, or one constituent element may be constituted by two or more constituent elements, if necessary. In addition, the functions performed in each block are intended to illustrate the embodiments of the present invention, and the specific operations and apparatuses do not limit the scope of the present invention.

Up to now, it has been described that the audio signal reproducing apparatus shown in FIG. 1 is implemented as an audio processing unit of the control unit 1700 in the video display apparatus 1000.

However, the present invention is not limited to this, and the audio signal reproducing apparatus shown in FIG. 1 may be implemented as a component of a portable device such as a mobile phone, a smart phone, or a tablet.

11 is a block diagram showing that the audio signal reproducing apparatus shown in FIG. 1 is embodied as a control unit of the mobile terminal 1000. FIG.

The mobile terminal 2100 includes a wireless communication unit 2110, an audio / video input unit 2120, a user input unit 2130, a sensing unit 2140, an output unit 2150, a memory 2160, A control unit 2180, a power supply unit 2190, and the like. The components shown in FIG. 1 are not essential, and a mobile terminal having more or fewer components may be implemented.

Hereinafter, the components will be described in order.

The control unit 2180 may include an audio processing unit 100 in which the audio signal reproducing apparatus 100 illustrated in FIG. 1 is implemented as a component.

The wireless communication unit 2110 may include one or more modules that enable wireless communication between the mobile terminal 2100 and the wireless communication system or between the mobile terminal 2100 and the network in which the mobile terminal 2100 is located. For example, the wireless communication unit 2110 may include a broadcast receiving module 2111, a mobile communication module 2112, a wireless Internet module 2113, a short-range communication module 2114, and a location information module 2115 .

The broadcast receiving module 2111 receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel. The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 2112. The broadcast signal and / or broadcast related information received through the broadcast receiving module 2111 may be stored in the memory 2160.

The mobile communication module 2112 transmits and receives radio signals to at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 2113 refers to a module for wireless Internet access, and may be built in or externally attached to the mobile terminal 2100. WLAN (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) and the like can be used as wireless Internet technologies.

The short-range communication module 2114 is a module for short-range communication. Bluetooth, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, and the like can be used as a short range communication technology.

The position information module 2115 is a module for obtaining the position of the mobile terminal, and a representative example thereof is a Global Position System (GPS) module.

11, an A / V (Audio / Video) input unit 2120 is for inputting an audio signal or a video signal, and may include a camera 2121, a microphone 2122, and the like. The camera 2121 processes an image frame such as a still image or a moving image obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame can be displayed on the display portion 2151.

The image frame processed by the camera 2121 can be stored in the memory 2160 or transmitted to the outside through the wireless communication unit 2110. [ More than two cameras 2121 may be provided depending on the use environment.

The microphone 2122 receives an external sound signal by a microphone in a communication mode, a recording mode, a voice recognition mode, or the like, and processes it as electrical voice data. The processed voice data can be converted into a form that can be transmitted to the mobile communication base station through the mobile communication module 2112 and output when the voice data is in the call mode. The microphone 2122 may be implemented with various noise reduction algorithms for eliminating noise generated in the process of receiving an external sound signal.

The user input unit 2130 generates input data for controlling the operation of the terminal. The user input unit 2130 may include a key pad dome switch, a touch pad (static / static), a jog wheel, a jog switch, and the like.

The sensing unit 2140 senses the current state of the mobile terminal 2100 such as the open / close state of the mobile terminal 2100, the position of the mobile terminal 2100, the presence or absence of user contact, the orientation of the mobile terminal, And generates a sensing signal for controlling the operation of the mobile terminal 2100. For example, when the mobile terminal 2100 is in the form of a slide phone, it is possible to sense whether the slide phone is opened or closed. It is also possible to sense whether the power supply unit 2190 is powered on, whether the interface unit 2170 is connected to an external device, and the like. Meanwhile, the sensing unit 2140 may include a proximity sensor 2141.

The output unit 2150 is for generating an output related to visual, auditory or tactile sense and may include a display unit 2151, an acoustic output module 2152, an alarm unit 2153 and a haptic module 2154 have.

The display unit 2151 displays (outputs) information processed by the mobile terminal 2100. For example, when the mobile terminal is in the call mode, a UI (User Interface) or a GUI (Graphic User Interface) associated with a call is displayed. When the mobile terminal 2100 is in the video communication mode or the photographing mode, the photographed and / or received video or UI and GUI are displayed.

The display unit 2151 may be a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED) display, a 3D display, and an e-ink display.

Some of these displays may be transparent or light transmissive so that they can be seen through. This can be referred to as a transparent display, and a typical example of the transparent display is TOLED (Transparent OLED) and the like. The rear structure of the display portion 2151 may also be of a light transmission type structure. With this structure, a user can see an object located behind the terminal body through an area occupied by the display portion 2151 of the terminal body.

There may be two or more display units 2151 according to the implementation of the mobile terminal 2100. [ For example, in the mobile terminal 2100, a plurality of display portions may be spaced apart from one another, or may be disposed integrally with each other, or may be disposed on different surfaces, respectively.

(Hereinafter, referred to as a 'touch screen') in which a display unit 2151 and a sensor (hereinafter, referred to as 'touch sensor') that detects a touch operation form a mutual layer structure, It can also be used as an input device. The touch sensor may have the form of, for example, a touch film, a touch sheet, a touch pad, or the like.

The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the display portion 2151 or a capacitance generated in a specific portion of the display portion 2151 into an electrical input signal. The touch sensor can be configured to detect not only the position and area to be touched but also the pressure at the time of touch.

If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and then transmits the corresponding data to the controller 2180. Thus, the control unit 2180 can know which area of the display unit 2151 is touched or the like.

Referring to FIG. 11, a proximity sensor 2141 may be disposed in an inner region of the mobile terminal or in the vicinity of the touch screen, which is surrounded by the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.

Examples of the proximity sensor include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.

The audio output module 2152 can output audio data received from the wireless communication unit 2110 or stored in the memory 2160 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output module 2152 also outputs sound signals related to functions (e.g., call signal reception tones, message reception tones, etc.) performed in the mobile terminal 2100. The sound output module 2152 may include a receiver, a speaker, a buzzer, and the like.

The alarm unit 2153 outputs a signal for notifying the occurrence of an event of the mobile terminal 2100. Examples of events that occur in the mobile terminal include call signal reception, message reception, key signal input, touch input, and the like. The alarm unit 2153 may output a signal for informing occurrence of an event in a form other than a video signal or an audio signal, for example, vibration. The video signal or the audio signal may be output through the display unit 2151 or the audio output module 2152 so that they may be classified as a part of the alarm unit 2153.

The haptic module 2154 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 2154 is vibration. The intensity and pattern of the vibration generated by the haptic module 2154 are controllable. For example, different vibrations may be synthesized and output or sequentially output.

In addition to the vibration, the haptic module 2154 may include a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, a touch on the skin surface, contact with an electrode, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 2154 can be implemented not only to transmit the tactile effect through direct contact but also to allow the user to feel the tactile effect through the muscular sense of the finger or arm. The haptic module 2154 may include two or more haptic modules according to the configuration of the mobile terminal 2100.

The memory 2160 may store a program for the operation of the controller 2180 and may temporarily store input / output data (e.g., a phone book, a message, a still image, The memory 2160 may store data on vibration and sound of various patterns outputted when a touch is input on the touch screen.

The memory 2160 may be a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (e.g., SD or XD memory), a RAM (Random Access Memory), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read- A disk, and / or an optical disk. The mobile terminal 2100 may operate in association with a web storage that performs the storage function of the memory 2160 on the Internet.

The interface unit 2170 serves as a pathway to all external devices connected to the mobile terminal 2100. The interface unit 2170 receives data from an external device or receives power from the external device and transmits the data to each component in the mobile terminal 2100 or allows data in the mobile terminal 2100 to be transmitted to an external device. For example, a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device having an identification module, an audio I / O port, A video input / output (I / O) port, an earphone port, and the like may be included in the interface unit 2170.

The identification module is a chip for storing various information for authenticating the usage right of the mobile terminal 2100 and includes a user identification module (UIM), a subscriber identity module (SIM), a general user authentication module a universal subscriber identity module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 2100 through the port.

When the mobile terminal 2100 is connected to an external cradle, the interface unit may be a path through which the power from the cradle is supplied to the mobile terminal 2100 or various command signals input by the user from the cradle may be transmitted It can be a passage to be transmitted to the terminal. The various command signals or the power source input from the cradle may be operated as a signal for recognizing that the mobile terminal is correctly mounted on the cradle.

The controller 180 typically controls the overall operation of the mobile terminal. For example, voice communication, data communication, video communication, and the like.

The power supply unit 2190 receives external power and internal power under the control of the controller 2180 and supplies power necessary for operation of the respective components.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, May be modified, modified, or improved.

FIG. 12 is a block diagram showing that the audio signal reproducing apparatus shown in FIG. 1 is implemented as a combination of the storage means 3100 and the controller 3200 of the multimedia apparatus 3000.

As shown in FIG. 12, the multimedia device 3000 includes a storage unit 3100 and a controller 3200.

The storage means 3100 stores a software program or codes in which the functions of the above-described audio signal reproducing apparatus are implemented. Implementation of the functions of the audio signal reproducing apparatus by a software program or code is obvious to those skilled in the art and will not be described in detail.

The controller 3200 reads out and executes the software program or code stored in the storage unit 3100.

The operation of the storage unit 3100 and the controller 3200 will be briefly described. The storage unit 3200 includes a first filter function for adding a sound effect to an input audio signal and outputting a sound effect to the input audio signal, And outputs the second filter function. And the controller 3200 drives the first filter and the second filter functions in the storage means 3100. For example, the controller 3200 may mix the different sound effects of the first filter and the second filter to the input audio signal and sequentially output them.

101: Audio decoder 103: Sound image positioner
105: crosstalk reduction unit 107: subband analysis unit
109: phase adjustment unit 111: gain adjustment unit
113: Subband synthesis unit 115: Sound effect unit
1000: image display device 2000: mobile terminal

Claims (11)

A first filter for receiving filter coefficients, adding different sound effects to the audio signals according to the received filter coefficients, and outputting the audio signals;
A second filter for receiving filter coefficients different from the filter coefficients received from the first filter, adding a different sound effect to the audio signal according to the received filter coefficient, and outputting the added audio effect; And
Inputting a filter coefficient corresponding to the first sound effect to the first filter so that the first filter mixes and outputs the first sound effect to the audio signal when a first sound effect output request is received,
Wherein when the second sound effect output is requested while the first sound effect mixed audio signal is being output, the second filter starts driving the second sound effect, and the second filter mixes the second sound effect with the audio signal A filter coefficient corresponding to the second acoustic effect is input to the second filter,
When the third sound effect output is requested while the audio signal in which the second sound effect is mixed is started, the first filter starts driving the first filter, and the first filter mixes the third sound effect with the audio signal And a controller for inputting a filter coefficient corresponding to the third acoustic effect to the first filter,
Wherein the first and second filters are simultaneously driven for a predetermined period of time. delete delete delete delete delete delete delete delete delete Inputting a filter coefficient corresponding to the first sound effect to the first filter such that a first filter mixes and outputs the first sound effect to an audio signal when a first sound effect output request is received;
When the first sound effect mixed audio signal is being output and when a second sound effect output is requested, the second filter starts driving, and the second filter mixes the second sound effect with the audio signal Inputting a filter coefficient corresponding to the second acoustic effect to the second filter; And
When the third sound effect output is requested while the audio signal in which the second sound effect is mixed is started, the first filter starts driving the first filter, and the first filter mixes the third sound effect with the audio signal And inputting a filter coefficient corresponding to the third acoustic effect to the first filter,
Wherein the first filter receives the filter coefficients and adds different sound effects to the audio signals according to the received filter coefficients,
Wherein the second filter receives a filter coefficient different from the filter coefficient received from the first filter and adds a different sound effect to the audio signal according to the received filter coefficient and outputs the added audio effect.

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