JP2023007870A - Display device and sound output method - Google Patents

Abstract

To provide a display device and a sound output method capable of constructing a surround environment by using not only a speaker constituted as a common channel set but also a speaker with a different channel set.SOLUTION: A display device 100 comprises: a sound signal acquisition section 1a for receiving a sound signal 11 of surround sound; a display device body 8 including an incorporated speaker 2 for outputting a first sound signal 11a being the sound signal 11 based on a first channel; a sound signal processing section 1b for generating the first sound signal 11a based on the first channel, extracting a second channel including the channel different from the first channel, and generating a second sound signal 11b being the sound signal 11 in a form corresponding to an output form of an external speaker 9; and a sound signal output section 1c for outputting the first sound signal 11a with respect to the incorporated speaker 2, and outputting the second sound signal 11b to an external speaker 9 via a wireless communication section 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to a display device and an audio output method, and more particularly to a display device and an audio output method for outputting surround audio.

2. Description of the Related Art Conventionally, a display device that outputs surround sound is known (see Patent Document 1, for example).

The aforementioned Patent Document 1 discloses an acoustic system including an audio output device (display device) including a speaker section and a display section, a plurality of external speakers, and an AV amplifier. In the configuration disclosed in Patent Document 1, when displaying video on the display unit, a surround environment is constructed using a speaker unit included in the audio output device and a plurality of external speakers. In Patent Document 1, the audio output device and the AV amplifier are connected by wire. Also, although not specified in Patent Document 1, it is considered that the AV amplifier and the plurality of external speakers are connected by wire.

Here, when the AV amplifier and a plurality of external speakers are wired-connected as in Patent Document 1, handling of wiring becomes complicated, and the degree of freedom in arranging the external speakers decreases. As a result, the degree of freedom in arranging the external speakers is reduced, which may make it difficult to create a surround environment.

In order to solve this problem, Patent Document 2 proposes constructing a surround environment using a content output device in which a plurality of speakers are wirelessly connected. Patent Document 2 above discloses a content output device that includes a connection unit, an output unit, and an allocation unit. The connection section disclosed in Patent Document 2 is connected to a plurality of audio devices (speakers). In the configuration disclosed in Patent Literature 2, each of the plurality of speakers is connected to the connecting section by wireless connection. The output unit is configured to output the multi-channel content signal to the plurality of speakers via the connection unit. Also, the plurality of speakers are arranged at positions different from each other. The allocation unit is configured to allocate each channel included in the content signal to different speakers. That is, the content output device disclosed in Patent Document 2 constructs a surround environment by individually assigning content signals of a plurality of channels to each of a plurality of speakers by an assignment unit. In addition, Patent Document 1 above discloses a configuration in which speakers having the same configuration and function are used as a plurality of speakers.

Japanese Unexamined Patent Application Publication No. 2011-035528 WO2018/173195

Here, in Patent Document 2, when a surround environment is constructed by wireless connection, each speaker is controlled by a common control method. That is, when constructing a surround environment using a plurality of speakers connected by wireless connection, the surround environment is constructed by controlling each speaker as a common channel set. A channel set as described herein means a non-overlapping set of channels in which each connected speaker is assigned, for example, a front left channel, a front right channel, a rear left channel, a rear right channel, and a center channel. Shows the combination of channels as a group of pairs. Therefore, when constructing a surround environment using a plurality of wirelessly connected speakers as in the configuration disclosed in Patent Document 2, each speaker constructing the surround environment is incorporated into a common channel set. However, if speakers with different channel sets, or speakers that support only LR channels, are used as part of the surround speakers, it is difficult to create a surround environment. In other words, the configuration disclosed in Patent Document 2 has a problem that it is necessary to use speakers that can be configured with a common channel set in order to construct a surround environment.

The present invention provides a display capable of constructing a surround environment not only by using speakers configured with a common channel set, but also by using speakers that cannot be included in one set of channel sets as groups of different channels. The object is to provide an apparatus and an audio output method. Hereinafter, the combination of each channel will be described as the first channel, the second channel, and so on. For example, each data of an audio signal including a front left channel, a front right channel, a rear left channel, a rear right channel, and a center channel is transferred to a first channel including a left channel, a right channel, and a center channel, and a left channel. and the second channel including the right channel to output an audio signal as surround sound.

To achieve the above object, a display device according to a first aspect of the present invention includes an audio signal acquisition unit that receives an audio signal of surround audio including three or more channels, and at least one of the channels. a display device main body including a built-in speaker that outputs a first audio signal that is an audio signal based on a first channel including a display device main body that generates a first audio signal based on the first channel and at least one an audio signal processing unit that extracts a second channel including two channels, and based on the extracted second channel, generates a second audio signal that is an audio signal in a format corresponding to the output format of the external speaker; an audio signal output unit for outputting the first audio signal to the external speaker and outputting the second audio signal to the external speaker via the wireless communication unit;

In the display device according to the first aspect of the present invention, as described above, audio signal processing is performed to generate the first audio signal and to generate the second audio signal, which is an audio signal in a format corresponding to the output format of the external speaker. and an audio signal output unit that outputs the first audio signal to the built-in speaker and outputs the second audio signal to the external speaker. As a result, the first audio signal is output to the internal speaker, and the audio signal in a format that can be output by the external speaker is output to the external speaker as the second audio signal. Even if a common channel set cannot be configured, a surround environment can be constructed with built-in speakers and external speakers. As a result, it is possible to provide a display device capable of constructing a surround environment even when configured as a common channel set. Moreover, a surround environment can be easily constructed by using a built-in speaker built into the display device main body and a general-purpose external speaker.

In the display device according to the first aspect, preferably, the audio output format of the external speaker is stereo format, and the audio signal processing unit outputs the stereo format second audio signal based on the audio signal of the second channel. configured to generate With this configuration, stereo speakers can be used as external speakers when constructing a surround environment. As a result, it is possible to improve the degree of freedom in selecting external speakers, so that the user can easily construct a surround environment without using dedicated speakers.

In the display device according to the first aspect, the three or more channels preferably include a front left channel, a front right channel, a rear left channel, a rear right channel, and a center channel, and the first channel is a front left channel. channel, a front right channel and a center channel, the second channel includes a rear left channel and a rear right channel, and the audio signal processor generates a second audio signal based on the rear left channel and the rear right channel. In addition, the first audio signal is generated based on the front left channel, the front right channel, and the center channel, which are channels other than the rear left channel and the rear right channel. With this configuration, among the audio signals including the front left channel, the front right channel, the rear left channel, the rear right channel, and the center channel, the audio of the second audio signal based on the rear left channel and the rear right channel. can be output from an external speaker, and the sound of the first audio signal based on the front left channel, the front right channel, and the center channel, which are channels other than the rear left channel and the rear right channel, is output from the built-in speaker can do. As a result, by arranging the external speakers so as to face the display device, it is possible to easily construct a surround environment using the built-in speakers provided in the display device and the external speakers.

The display device according to the first aspect preferably further includes an input reception unit that receives operation input from the operator, wherein the audio signal processing unit receives the first It is configured to generate two audio signals. With this configuration, the second audio signal of the channel desired by the user is generated, so that the sound of the second audio signal of the channel desired by the user can be output from the external speaker. As a result, the sound of the channel corresponding to the arrangement of the external speakers can be output from the external speakers, so that the degree of freedom in arranging the external speakers can be improved.

In the display device according to the first aspect, preferably, when the number of channels that can be output by the built-in speaker is smaller than the number of channels included in the audio signal other than the second channel, Based on channels other than the second channel, the first audio signal is obtained by mixing a plurality of channels so that the number of channels included in the first audio signal is equal to or less than the number of channels that can be output by the built-in speaker. is configured to generate With this configuration, the first audio signal is generated in the number of channels that can be output by the built-in speaker, so the number of channels included in the first audio signal is greater than the number of channels that can be output by the built-in speaker. Even in this case, it is possible to output from the built-in speaker the sounds of the first audio signal for the number of channels that the built-in speaker can output. As a result, for example, even if the built-in speakers are stereo speakers, by outputting the sound of the first audio signal from the built-in speakers and the sound of the second audio signal from the external speakers, the surround environment can be reproduced. can be built.

The display device according to the first aspect preferably further includes an input reception unit that receives operation input from the operator, and the audio signal processing unit outputs the second audio signal from the external speaker based on the operation input from the operator. It is configured to adjust the timing of outputting the sound based on the With this configuration, it is possible to adjust the timing of outputting the sound based on the second audio signal from the external speaker. Therefore, even if it is difficult to control the external speaker by the display device, The output sound and the second sound output from the external speaker can be synchronized. As a result, it is possible to improve the degree of freedom in selecting speakers that can be used as external speakers, thereby improving convenience for the user.

In the display device according to the first aspect, preferably, the built-in speaker and the external speaker include formats different from each other as formats of audio signals that can be output. Here, in a general surround system, when constructing a surround environment, a plurality of speakers that can output audio signals of the same format are used. That is, in general surround systems, it is difficult to construct a surround environment when different formats are included as formats of audio signals that can be output. By applying the present invention, it is possible to construct a surround environment even if the format of the audio signal that can be output by the built-in speaker and the format of the audio signal that can be output by the external speaker are different from each other. As a result, the degree of freedom in device configuration can be improved.

In the display device according to the first aspect, the audio signal processing section is preferably configured to encode the first audio signal and the second audio signal to generate at least one audio file having a new audio format. ing. With this configuration, by generating an audio file as an audio file in a general format such as mp3 or wav, for example, a dedicated speaker capable of reproducing surround sound as an internal speaker and an external speaker An audio file based on the first audio signal and the second audio signal can be played without using the . As a result, a surround environment can be easily constructed by using general-purpose speakers as the built-in speakers and external speakers without using dedicated speakers. Also, for example, by generating the audio file as an audio file in a common format such as mp3 or wav, it can be easily played back on other display devices.

In the display device according to the first aspect, it is preferable that the wireless communication unit is configured to be capable of short-range wireless communication, and the audio signal output unit outputs an external speaker through the short-range wireless communication via the wireless communication unit. is configured to output the second audio signal to the With this configuration, the audio signal output is wirelessly connected to the external speaker via the wireless communication unit by short-range wireless communication. It is possible to improve the degree of freedom in arranging the speakers. As a result, it is possible to improve the degree of freedom in arranging the external speakers, thereby improving user convenience.

Also, an audio output method according to a second aspect of the present invention includes the steps of receiving an audio signal of surround audio including three or more channels; generating an audio signal; extracting a second channel that is at least one channel different from the first channel; and producing an audio signal in a format corresponding to an output format of an external speaker based on the extracted second channel. , outputting the first audio signal to a speaker connected to the main body, and outputting the second audio signal to an external speaker by wireless communication.

In the audio output method according to the second aspect of the present invention, as described above, the step of generating the first audio signal and the step of generating the second audio signal, which is an audio signal in a format corresponding to the output format of the external speaker. and a step of outputting the first audio signal to the speaker connected to the main body, and a step of outputting the second audio signal to the external speaker by wireless communication. Thus, as in the display device according to the first aspect, an audio output method capable of constructing a surround environment not only by using speakers configured as a common channel set but also by using speakers with different channel sets. can be provided.

According to the present invention, it is possible to provide a display device and an audio output method capable of constructing a surround environment not only by using speakers configured as a common channel set, but also by using speakers with different channel sets. can.

1 is a block diagram of a display device according to a first embodiment; FIG. 3A and 3B are schematic diagrams for explaining a built-in speaker and an external speaker of the display device according to the first embodiment; FIG. FIG. 4 is a schematic diagram for explaining a structure in which an audio signal processing unit according to the first embodiment generates a first audio signal and a second audio signal; 4 is a flow chart for explaining a process of outputting a first audio signal and a second audio signal by the display device according to the first embodiment; FIG. 4 is a block diagram of a display device according to a second embodiment; FIG. FIG. 10 is a schematic diagram for explaining a configuration in which an audio signal processing unit according to the second embodiment sets a second channel; 10 is a flow chart for explaining processing for setting the second channel by the display device according to the second embodiment. FIG. 12 is a block diagram of a display device according to a third embodiment; FIG. FIG. 11 is a schematic diagram for explaining a configuration in which an audio signal processing unit according to the third embodiment adjusts the timing of outputting the audio of the second audio signal; 10 is a flow chart for explaining the process of adjusting the timing of outputting the sound of the second audio signal by the display device according to the third embodiment.

Embodiments embodying the present invention will be described below with reference to the drawings.

[First embodiment]
First, the configuration of the display device 100 according to the first embodiment will be described with reference to FIG.

A display device 100 according to the first embodiment includes a control unit 1 and a built-in speaker 2, as shown in FIG. Further, in the first embodiment, the display device 100 includes the content acquisition unit 3 , the display unit 4 , the storage unit 5 , the input reception unit 6 and the wireless communication unit 7 . Control unit 1 , built-in speaker 2 , content acquisition unit 3 , display unit 4 , storage unit 5 , input reception unit 6 , and wireless communication unit 7 are provided in display device main body 8 . The built-in speaker 2 is an example of the "main unit-connected speaker" in the scope of claims.

The control unit 1 is configured to control the display device 100 . Further, in the first embodiment, the control unit 1 is configured to perform control to change the image displayed on the display unit 4 based on the operation input received by the input receiving unit 6 . The control unit 1 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), a GPU (Graphics Processing Unit), or an FPGA (Field-Programmable Gate) configured for image processing. Array). The control unit 1 also includes, as functional blocks of software (program), an audio signal acquisition unit 1a, an audio signal processing unit 1b, and an audio signal output unit 1c. The audio signal acquisition unit 1a, the audio signal processing unit 1b, and the audio signal output unit 1c may be individually configured by hardware by providing a dedicated processor (processing circuit).

The control unit 1 also includes, as a functional block of software (program), a video signal processing unit (not shown) that processes video signals. The video signal processing unit performs conversion of video signals and the like.

In the first embodiment, the audio signal acquisition unit 1a is configured to acquire the audio signal 11 included in the content 10 acquired by the content acquisition unit 3. FIG. In the first embodiment, the audio signal acquisition unit 1a is configured to acquire the audio signal 11 of surround sound. Surround sound is sound that has more channels than monaural sound (one channel) and stereo sound (two channels). Specifically, the audio signal acquisition unit 1a is configured to receive an audio signal 11 of surround sound (sound including three or more channels). In the first embodiment, a case where the audio signal acquisition unit 1a acquires a 5.1-channel audio signal as the surround audio audio signal 11 will be described.

The audio signal processor 1b is configured to generate a first audio signal 11a based on the first channel. Further, the audio signal processing unit 1b extracts a second channel including at least one channel different from the first channel, and based on the extracted second channel, an audio signal in a format corresponding to the output format of the external speaker 9. 11 is configured to generate a second audio signal 11b. In the first embodiment, of the three or more channels, the channel that is output to the built-in speaker 2 is the first channel. The first channel may include one channel or may be a group of channels including multiple channels. Also, among the audio signals 11, the audio signal output to the built-in speaker 2 is referred to as a first audio signal 11a. That is, the first audio signal 11a is the audio signal 11 based on the first channel.

A channel output to the external speaker 9 among the three or more channels is referred to as a second channel. Also, the second channel may include one channel or may be a channel group including a plurality of channels. Also, the audio signal output to the external speaker 9 among the audio signals 11 is referred to as a second audio signal 11b. That is, the second audio signal 11b is the audio signal 11 based on the second channel. The external speaker 9 is a speaker provided outside the display device main body 8 . Details of the first channel and the second channel, and the configuration for generating the first audio signal 11a and the second audio signal 11b by the audio signal processing unit 1b will be described later.

The audio signal output unit 1c is configured to output the first audio signal 11a to the built-in speaker 2. FIG. In the first embodiment, the audio signal output section 1c is electrically connected to the built-in speaker 2. FIG. Specifically, the audio signal output unit 1c and the built-in speaker 2 are electrically connected by wire-connecting the control unit 1 and the built-in speaker 2 . In the first embodiment, the audio signal output unit 1c outputs the first audio signal 11a to the built-in speaker 2 connected by wire.

Also, the audio signal output unit 1c is configured to output the second audio signal 11b to the external speaker 9 via the wireless communication unit 7 by short-range wireless communication. In the first embodiment, the audio signal output unit 1c outputs the second audio signal 11b to the external speaker 9 by wireless communication using Bluetooth (registered trademark), for example.

The built-in speaker 2 is configured to output a first audio signal 11a, which is an audio signal 11 based on a first channel including at least one of the channels. The details of the first audio signal 11a output by the built-in speaker 2 will be described later.

The content acquisition unit 3 is configured to acquire content 10 . Content 10 includes audio signal 11 and video signal 12 . The content acquisition unit 3 acquires the content 10 from the outside of the display device 100 by wireless connection or wired connection. For example, the content acquisition unit 3 acquires the content 10 using either television broadcast waves as a wireless connection or communication via a network as a wireless connection. In addition, the content acquisition unit 3 acquires the content 10 through a wired connection with a portable storage medium playback device such as a DVD (Digital Versatile Disc) or a BD (Blu-ray (registered trademark) Disc). . In the first embodiment, the content acquisition unit 3 includes, for example, a reception unit for receiving television broadcast waves, a connection unit for a portable storage medium playback device, and an Internet communication connection unit.

The display unit 4 is configured to display video based on the video signal 12 included in the content 10 . The display unit 4 includes, for example, a liquid crystal panel and backlight, or an organic electroluminescence panel.

The storage unit 5 stores various programs executed by the control unit 1 . Storage unit 5 includes, for example, a nonvolatile storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive).

The input reception unit 6 is configured to receive an operation input from an operator. In the first embodiment, the input reception unit 6 is configured to receive an operation input by receiving a signal (remote control communication signal) emitted from an operation device (remote controller) for operating the display device 100, for example. It is Input accepting unit 6 includes, for example, an infrared receiver.

The wireless communication unit 7 is configured to be capable of short-distance wireless communication. In the first embodiment, the wireless communication unit 7 is configured to be capable of Bluetooth (registered trademark) communication as short-range wireless communication, for example. Also, the wireless communication unit 7 is connected to an external speaker 9 . Also, the wireless communication unit 7 is configured to communicate with an external speaker 9 . That is, the external speaker 9 is configured to acquire the second audio signal 11b from the audio signal output section 1c via the wireless communication section 7 by short-range wireless communication. In the first embodiment, the wireless communication unit 7 includes, for example, a communication device that performs short-range wireless communication.

The display device body 8 includes a control unit 1, a built-in speaker 2, a content acquisition unit 3, a display unit 4, a storage unit 5, an input reception unit 6, and a wireless communication unit 7 inside. Display device main body 8 includes, for example, a housing of display device 100 .

The external speaker 9 is configured to output sound based on the second audio signal 11b output from the audio signal output section 1c. In the first embodiment, the external speaker 9 is wirelessly connected to the display device 100 via the wireless communication section 7 . The external speaker 9 is an audio output device including a wireless communication section, a control section, a storage section, and the like.

In the first embodiment, the built-in speaker 2 and the external speaker 9 include different formats as formats of the audio signal 11 that can be output. In other words, the built-in speaker 2 and the external speaker 9 are speakers that process the same contents and are not connected so as to be able to output them, or cannot be output even if they are connected. Also, the built-in speaker 2 and the external speaker 9 are speakers that do not have a common control base such as firmware. The built-in speaker 2 and the external speaker 9 are, for example, speakers manufactured by different companies (companies).

In addition, the external speakers 9 include speakers that are not compatible with surround sound reproduction (non-compatible). That is, the external speaker 9 is a speaker recognized by the control unit 1 as a stereo reproduction device when the external speaker 9 is connected to the display device 100 via the wireless communication unit 7 .

(built-in speaker and external speaker)
As shown in FIG. 2, the display device 100 includes, as the built-in speakers 2, a first built-in speaker 2a, a second built-in speaker 2b, and a third built-in speaker 2c. The first built-in speaker 2a is a speaker provided on the right side of the display device body 8 (on the left side as seen from the operator). The second built-in speaker 2b is a speaker provided on the left side of the display device body 8 (on the right side as seen from the operator). Also, the third built-in speaker 2 c is a speaker provided in the central portion of the display device main body 8 .

In the first embodiment, the built-in speaker 2 outputs audio including front channel audio signals. Specifically, the first built-in speaker 2a is a speaker that outputs the sound on the left side (front left channel) of the front channel sound in the surround sound. The second built-in speaker 2b is a speaker for outputting the sound on the right side (front right channel) of the front channel sound in the surround sound. The third built-in speaker 2c is a speaker (subwoofer) that outputs low-pitched sounds in the surround sound. That is, in the first embodiment, the built-in speaker 2 is a speaker capable of outputting the 2.1-channel audio signal 11 .

Also, as shown in FIG. 2, the external speaker 9 includes a first external speaker 9a and a second external speaker 9b. That is, in the first embodiment, the external speaker 9 is a speaker capable of outputting two-channel audio signals 11 . In other words, the audio output format of the external speaker 9 is a stereo format. It should be noted that the external speakers 9 can be connected in the same number as the connection ports of the wireless communication unit 7 . In the first embodiment, one speaker (first external speaker 9a and second external speaker 9b) is shown as the external speaker 9 in FIG. 2 for the sake of simplicity of explanation.

In the first embodiment, the display device 100 includes a first built-in speaker 2a and a second built-in speaker 2b included in the display device 100, a first external speaker 9a wirelessly connected to the display device 100, and a second external speaker 9b. is configured to be able to construct a surround environment. Further, in the first embodiment, the display device 100 includes the third built-in speaker 2c (subwoofer). Therefore, the display device 100 can construct a 4.1ch surround environment.

(Generation of first audio signal and second audio signal)
Next, a configuration in which the audio signal processing unit 1b generates the first audio signal 11a and the second audio signal 11b will be described with reference to FIG.

As shown in FIG. 3, the audio signal 11 is an audio signal including a plurality of subframes within one frame. Each subframe contains audio signal data corresponding to each channel. In the first embodiment, the audio signal 11 is a surround audio audio signal including three or more channels. That is, in the first embodiment, the audio signal 11 is a signal obtained by converting an analog signal such as a linear PCM (Pulse Code Modulation) system into a digital signal.

In the first embodiment, the three or more channels include front left channel 20a, front right channel 20b, center channel 20c, rear left channel 20d, and rear right channel 20e. The channels also include an LFE (Low Frequency Effect) channel 20f. That is, the audio signal 11 is a 5.1-channel surround audio signal.

In the first embodiment, the audio signal processing unit 1b generates the first audio signal 11a and the second audio signal 11b for each frame. Specifically, the audio signal processing unit 1b generates a first audio signal 11a and a second audio signal 11b based on subframes included in one frame.

In the first embodiment, the audio signal processing unit 1b is configured to generate a stereo-format second audio signal 11b based on the audio signal 11 of the second channel. In the first embodiment, the audio signal processing unit 1b generates the second audio signal 11b by extracting the audio signal data of a predetermined channel as the second channel in the order of connection to the wireless communication unit 7. do. In the first embodiment, the second channels include rear left channel 20d and rear right channel 20e. Therefore, the audio signal processing section 1b generates the second audio signal 11b based on the rear left channel 20d and the rear right channel 20e. Specifically, the audio signal processing unit 1b processes the audio signal data included in the subframe of the rear left channel 20d and the audio signal data included in the subframe of the rear right channel 20e in one frame of the audio signal 11. to generate the second audio signal 11b. That is, in the first embodiment, the audio signal processing unit 1b generates the second audio signal 11b based on the rear left channel 20d and the rear right channel 20e for the external speaker 9 first connected to the display device 100. It is preset to be When a plurality of external speakers 9 are connected to the display device 100, audio signals generated based on predetermined channels are output to the external speakers 9 in order of connection.

Further, in the first embodiment, the audio signal processing unit 1b extracts the audio signal of the first channel among the plurality of channels included in one frame of the audio signal 11, and based on the extracted audio signal, performs the first A voice signal 11a is generated.

In the first embodiment, the first channels include front left channel 20a, front right channel 20b and center channel 20c. Also, in the first embodiment, the first channel includes the LFE channel 20f.

In the first embodiment, since the second channel includes the rear left channel 20d and the rear right channel 20e, the audio signal processing unit 1b includes the front left channel 20a and the front left channel 20a, which are channels other than the rear left channel 20d and the rear right channel 20e. It is configured to generate the first audio signal 11a based on the right channel 20b and the center channel 20c.

In the first embodiment, the number of channels that the built-in speaker 2 can output is smaller than the number of channels other than the second channel included in the audio signal 11 . Therefore, in the first embodiment, when the number of channels that can be output by the built-in speaker 2 is smaller than the number of channels other than the second channel among the channels included in the audio signal 11, the audio signal processing unit 1b By mixing a plurality of channels so that the number of channels included in the first audio signal 11a is equal to or less than the number of channels that the built-in speaker 2 can output based on channels other than the channels, the first audio signal 11a.

Therefore, the audio signal processing unit 1b first converts the audio signal data included in each subframe of the front left channel 20a, the front right channel 20b, the center channel 20c, and the LFE channel 20f in one frame of the audio signal 11 into The extraction produces an intermediate audio signal 11c. Note that, as shown in FIG. 3, the intermediate audio signal 11c does not include the audio signal data of the rear left channel 20d and the rear right channel 20e. That is, in the intermediate audio signal 11c, the subframes 21 and 22 do not contain the audio signals of the rear left channel 20d and the rear right channel 20e. Note that, as shown in FIG. 3, the intermediate audio signal 11c includes a front left channel 20a, a front right channel 20b, a center channel 20c, and an LFE channel 20f. That is, the intermediate audio signal 11c is a 3.1-channel audio signal.

In the first embodiment, the built-in speaker 2 is a speaker capable of outputting a 2.1-channel audio signal 11 . Therefore, the audio signal processing unit 1b mixes the channels included in the intermediate audio signal 11c to generate the first audio signal 11a that can be output from the built-in speaker 2. FIG. That is, the audio signal processing unit 1b generates the 2.1-channel first audio signal 11a based on the 3.1-channel intermediate audio signal 11c. Specifically, the audio signal processing unit 1b generates a front mix left channel 20g based on the front left channel 20a and the center channel 20c. Also, the audio signal processing unit 1b generates a front mix right channel 20h based on the front right channel 20b and the center channel 20c. Therefore, the audio signal processing unit 1b generates the first audio signal 11a based on the front mix left channel 20g, the front mix right channel 20h, and the LFE channel 20f.

In the first embodiment, of the first audio signal 11a output to the built-in speaker 2, the sound based on the front mix left channel 20g is output from the first built-in speaker 2a. Further, among the first audio signal 11a output to the built-in speaker 2, the sound based on the front mix right channel 20h is output from the second built-in speaker 2b. Further, among the first audio signal 11a output to the built-in speaker 2, the sound based on the LFE channel 20f is output from the third built-in speaker 2c.

When the number of channels that can be output by the built-in speaker 2 is greater than the number of channels of the first audio signal 11a, the audio signal processing unit 1b does not mix the audio signals. That is, the audio signal processing unit 1b reduces the number of channels included in the audio signal 11 only when the number of channels that can be output by the built-in speaker 2 is smaller than the number of channels of the first audio signal 11a (downmixing). I do.

Also, FIG. 3 shows an example in which the first channel and the second channel do not include a common channel among three or more channels. However, the first channel and the second channel may include common channels among three or more channels. For example, an audio signal of a channel with low localization may be commonly included in the first channel and the second channel. For example, a channel including audio signals from above the user may be included in common in the first channel and the second channel. On the other hand, if a channel with high localization is commonly included in the first channel and the second channel, it becomes difficult to construct a surround environment. Therefore, a channel with high localization should not be included in both the first channel and the second channel. For example, the front channel and the rear channel are not commonly included in the first channel and the second channel.

Further, as shown in FIG. 3, in the first embodiment, the audio signal processing unit 1b encodes the first audio signal 11a and the second audio signal 11b to generate at least one audio file having a new audio format. is configured to In the example shown in FIG. 3, the audio signal processing unit 1b encodes the first audio signal 11a to generate a first audio file 50 having a new audio format, and encodes the second audio signal 11b to generate a new audio format. It is arranged to generate a second audio file 51 having an audio format. The audio signal processing unit 1b generates audio files in a general format such as mp3 or wav as the first audio file 50 and the second audio file 51, for example. Also, the audio signal processing unit 1b stores the generated file in the storage unit 5 (see FIG. 1).

Next, with reference to FIG. 4, a process of outputting the first audio signal 11a and the second audio signal 11b by the display device 100 according to the first embodiment will be described.

In step S1, the audio signal acquisition unit 1a receives an audio signal 11 of surround audio including three or more channels. In the first embodiment, the audio signal acquisition unit 1a receives an audio signal 11 of 5.1-channel surround audio.

In step S2, the audio signal processing unit 1b extracts the second channel, which is at least one channel different from the first channel. In the first embodiment, the audio signal processing unit 1b extracts the rear left channel 20d and the rear right channel 20e as the second channels.

In step S3, the audio signal processing unit 1b generates the second audio signal 11b, which is the audio signal 11 in the format corresponding to the output format of the external speaker 9, based on the extracted second channel. In the first embodiment, the audio signal processing unit 1b generates a stereo-format second audio signal 11b.

In step S4, the audio signal processing unit 1b generates the first audio signal 11a based on the first channel including at least one of the channels. In the first embodiment, the audio signal processing unit 1b generates a first audio signal 11a based on first channels including a front left channel 20a, a front right channel 20b, a center channel 20c, and an LFE channel 20f. In the first embodiment, the audio signal processing unit 1b generates the first audio signal 11a by mixing a plurality of channels so that the number of channels is equal to or less than the number of channels that the built-in speaker 2 can output. Specifically, as shown in FIG. 3, the audio signal processing unit 1b generates the first audio signal 11a based on the front mix left channel 20g, the front mix right channel 20h, and the LFE channel 20f.

In step S5, the audio signal processing unit 1b determines whether or not to store the audio file. Specifically, the audio signal processing unit 1b determines whether or not to store the audio file based on whether or not the audio file is set to be stored. If the audio file is to be stored, the process proceeds to step S6. If the audio file is not stored, the process proceeds to step S8.

At step S6, the audio signal processing unit 1b encodes the first audio signal 11a and the second audio signal 11b to generate at least one audio file having a new audio format. In the first embodiment, the audio signal processing unit 1b generates the first audio file 50 by encoding the first audio signal 11a. Also, the audio signal processing unit 1b encodes the second audio signal 11b to generate a second audio file 51 having a new audio format. In the first embodiment, the audio signal processing unit 1b generates audio files in a general format such as mp3 or wav as the first audio file 50 and the second audio file 51, for example.

In step S<b>7 , the audio signal processing unit 1 b stores the generated first audio file 50 and second audio file 51 in the storage unit 5 .

In step S8, the audio signal output unit 1c outputs the first audio signal 11a to the built-in speaker 2. FIG.

In step S9, the audio signal output unit 1c outputs the second audio signal 11b to the external speaker 9 by wireless communication.

Either the series of processes of steps S2 and S3 or the process of step S4 may be performed first. Either the processing of step S5 or the processing of step S6 may be performed first.

Note that when the first audio file 50 and the second audio file 51 are generated and stored in the storage unit 5, the processing of steps S6 and S7 and the processing of steps S8 and S9 are performed as parallel processing. may

(Effect of the first embodiment)
The following effects can be obtained in the first embodiment.

In the first embodiment, as described above, the display device 100 includes the audio signal acquisition unit 1a that receives the surround audio audio signal 11 including three or more channels, and at least one of the channels. A display device main body 8 including a built-in speaker 2 that outputs a first audio signal 11a that is an audio signal 11 based on the first channel, and a first channel that generates the first audio signal 11a based on the first channel. Audio signal processing for extracting a second channel including at least one different channel and generating a second audio signal 11b, which is an audio signal 11 in a format corresponding to the output format of an external speaker 9, based on the extracted second channel. and an audio signal output unit 1c that outputs a first audio signal 11a to the built-in speaker 2 and outputs a second audio signal 11b to the external speaker 9 via the wireless communication unit 7. Prepare. As a result, the first audio signal 11a is output to the internal speaker 2, and the audio signal 11 in a format that can be output by the external speaker 9 is output to the external speaker 9 as the second audio signal 11b. Even if the speaker 2 and the external speaker 9 are not configured as a common channel set, the built-in speaker 2 and the external speaker 9 can construct a surround environment. As a result, it is possible to provide the display device 100 capable of constructing a surround environment not only by using speakers configured as a common channel set, but also by using speakers with different channel sets. Moreover, a surround environment can be easily constructed by using the built-in speaker 2 built in the display device main body 8 and the general-purpose external speaker 9 .

In the first embodiment, as described above, the audio output format of the external speaker 9 is the stereo format, and the audio signal processing unit 1b outputs the stereo format second audio signal based on the audio signal 11 of the second channel. It is configured to generate an audio signal 11b. As a result, stereo speakers can be used as the external speakers 9 when constructing a surround environment. As a result, it is possible to improve the degree of freedom in selecting the external speaker 9, so that the user can easily construct a surround environment without using a dedicated speaker.

Also, in the first embodiment, as described above, the three or more channels include the front left channel 20a, the front right channel 20b, the rear left channel 20d, the rear right channel 20e, and the center channel 20c. The channels include a front left channel 20a, a front right channel 20b, and a center channel 20c; the second channel includes a rear left channel 20d and a rear right channel 20e; While generating a second audio signal 11b based on the rear right channel 20e, based on the front left channel 20a, the front right channel 20b, and the center channel 20c, which are channels other than the rear left channel 20d and the rear right channel 20e, It is configured to generate a first audio signal 11a. As a result, out of the audio signal 11 including the front left channel 20a, the front right channel 20b, the rear left channel 20d, the rear right channel 20e, and the center channel 20c, the second audio signal based on the rear left channel 20d and the rear right channel 20e is generated. The sound of the audio signal 11b can be output from the external speaker 9, and is based on the front left channel 20a, the front right channel 20b, and the center channel 20c, which are channels other than the rear left channel 20d and the rear right channel 20e. The sound of the first audio signal 11a can be output from the built-in speaker 2. FIG. As a result, by arranging the external speaker 9 so as to face the display device 100 , the built-in speaker 2 provided in the display device 100 and the external speaker 9 can easily construct a surround environment.

In addition, in the first embodiment, as described above, the audio signal processing unit 1b makes the number of channels that can be output by the built-in speaker 2 larger than the number of channels other than the second channel among the channels included in the audio signal 11. If the number of channels is small, the number of channels included in the first audio signal 11a is equal to or less than the number of channels that can be output by the built-in speaker 2 based on channels other than the second channel. , to generate a first audio signal 11a. As a result, the number of channels included in the first audio signal 11a is greater than the number of channels that the internal speaker 2 can output. Even in this case, the built-in speaker 2 can output the sound of the first audio signal 11a for the number of channels that the built-in speaker 2 can output. As a result, for example, even if the built-in speaker 2 is a stereo speaker, it is possible to output the sound of the first audio signal 11a from the built-in speaker 2 and output the sound of the second audio signal 11b from the external speaker 9. A surround environment can be constructed by

Further, in the first embodiment, as described above, the built-in speaker 2 and the external speaker 9 include formats different from each other as formats of audio signals that can be output. Here, in a general surround system, when constructing a surround environment, a plurality of speakers having the same output format of the audio signal 11 are used. That is, in a general surround system, it is difficult to construct a surround environment when different formats are included as formats of the audio signal 11 that can be output. By applying the present invention, even if the format of the audio signal 11 that can be output by the built-in speaker 2 and the format of the audio signal 11 that can be output by the external speaker 9 are different from each other, it is possible to construct a surround environment. becomes. As a result, the degree of freedom in device configuration can be improved.

Further, in the first embodiment, as described above, the audio signal processing unit 1b encodes the first audio signal 11a and the second audio signal 11b to generate at least one audio file having a new audio format. is configured to As a result, an audio file (each of the first audio file 50 and the second audio file 51) is generated as an audio file in a general format such as mp3 or wav, so that the built-in speaker 2 and the external speaker 9 , an audio file based on the first audio signal 11a and the second audio signal 11b can be reproduced without using a dedicated speaker capable of reproducing surround sound. As a result, as the internal speaker 2 and the external speaker 9, a surround environment can be easily constructed by using general-purpose speakers without using dedicated speakers. Also, for example, by generating audio files (first audio file 50 and second audio file 51) as audio files in a general format such as mp3 or wav, they can be easily reproduced on other display devices. can.

Further, in the first embodiment, as described above, the wireless communication unit 7 is configured to be capable of short-range wireless communication, and the audio signal output unit 1c is configured to perform short-range wireless communication via the wireless communication unit 7. , to output the second audio signal 11 b to the external speaker 9 . As a result, the audio signal output unit 1c is wirelessly connected to the external speaker 9 via the wireless communication unit 7 by short-range wireless communication. Therefore, the degree of freedom in arranging the external speaker 9 can be improved. As a result, it is possible to improve the degree of freedom in arranging the external speaker 9, thereby improving the user's convenience.

Also, in the first embodiment, as described above, receiving the surround audio audio signal 11 comprising three or more channels; a step of generating a signal 11a; a step of extracting a second channel that is at least one channel different from the first channel; and based on the extracted second channel, outputting audio in a format corresponding to the output format of the external speaker 9. a step of generating a second audio signal 11b which is the signal 11; a step of outputting the first audio signal 11a to the built-in speaker 2 (main body connected speaker); and outputting the signal 11b. As a result, it is possible to provide an audio output method capable of constructing a surround environment not only by using speakers configured as a common channel set, but also by using speakers with different channel sets as in the display device 100. can be done.

[Second embodiment]
A second embodiment will be described with reference to FIGS. 5 and 6. FIG. In this second embodiment, the second audio signal 11b based on the preset second channel is output to the external speaker 9 in the order in which the external speaker 9 is connected to the display device 100 (see FIG. 1). Unlike the configuration of the form, the configuration in which the control unit 30 (see FIG. 5) provided in the display device 200 (see FIG. 5) selects the second channel based on the operator's operation input will be described.

As shown in FIG. 5, the display device 200 according to the second embodiment differs from the display device 100 according to the first embodiment in that a control section 30 is provided instead of the control section 1. FIG.

The control unit 30 differs from the control unit 1 according to the first embodiment in that it includes an audio signal processing unit 30a instead of the audio signal processing unit 1b and further includes a second channel setting unit 30b. The second channel setting section 30b is configured to set the second channel based on the operation input of the operator. The audio signal processing section 30a is configured to generate the second audio signal 11b based on the second channel set by the second channel setting section 30b.

(Configuration for setting the second channel)
Next, a configuration for setting the second channel by the second channel setting unit 30b according to the second embodiment will be described with reference to FIG.

FIG. 6 shows an audio channel setting screen 31 displayed on the display unit 4. As shown in FIG. The audio channel setting screen 31 includes a name display field 31a for displaying the name of the external speaker 9 connected to the display device 200, a channel selection field 31b for selecting a channel to be output to the external speaker 9, and an OK button 31c. , back button 31d.

The channel selection field 31b displays the channel set as the second channel. In the second embodiment, the channel selection field 31b includes, for example, pull-down selection fields.

The OK button 31 c is a button displayed on the audio channel setting screen 31 . Specifically, the OK button 31c is a button on a GUI (Graphical User Interface). When the OK button 31c is operated, the channel selected in the channel selection column 31b is stored in the storage unit 5 as the second channel. Also, after the second channel is set, the audio channel setting screen 31 is closed.

The return button 31 d is a GUI button displayed on the audio channel setting screen 31 . When the return button 31d is operated, the audio channel setting screen 31 is closed without setting the second channel.

In the second embodiment, the audio signal processing section 30a is configured to generate the second audio signal 11b based on the channel selected based on the operation input by the operator. That is, the audio signal processing section 30a according to the second embodiment generates the second audio signal 11b based on the second channel set by the second channel setting section 30b. The configuration for generating the second audio signal 11b by the audio signal processing unit 30a according to the second embodiment is the same as the configuration for generating the second audio signal 11b by the audio signal processing unit 1b according to the first embodiment. Therefore, detailed description is omitted.

(Second channel setting process)
Next, with reference to FIG. 7, processing for setting the second channel by the second channel setting unit 30b according to the second embodiment will be described.

In step S10, the second channel setting unit 30b determines whether or not an operation input for setting the second channel has been received. Specifically, the second channel setting unit 30b determines whether or not the channel selection field 31b has been operated. If the channel selection field 31b is operated, the process proceeds to step S11. If the channel selection field 31b is not operated, the second channel setting section 30b repeats the process of step S10.

In step S11, the second channel setting unit 30b determines whether or not an operation input for ending the setting of the second channel has been received. Specifically, the second channel setting unit 30b determines whether or not the OK button 31c has been pressed. If the OK button 31c is pressed, the process proceeds to step S12. If the OK button 31c has not been pressed, the process proceeds to step S13.

In step S12, the second channel setting unit 30b sets the channel selected in the channel selection field 31b as the second channel. Specifically, the second channel setting unit 30b stores the channel selected in the channel selection field 31b in the storage unit 5. FIG. After that, the second channel setting unit 30b closes the audio channel setting screen 31. FIG. After that, the process ends.

Also, when the process proceeds from step S11 to step S13, in step S13, the second channel setting unit 30b determines whether or not an operation input for closing the audio channel setting screen 31 has been received. Specifically, the second channel setting unit 30b determines whether the return button 31d has been pressed. When the return button 31d is pressed, the second channel setting unit 30b closes the audio channel setting screen 31. FIG. After that, the process ends. If the return button 31d has not been pressed, the process proceeds to step S10.

Other configurations of the display device 200 according to the second embodiment are the same as those of the display device 100 according to the first embodiment.

(Effect of Second Embodiment)
The following effects can be obtained in the second embodiment.

In the second embodiment, as described above, the input reception unit 6 that receives the operation input of the operator is further provided, and the audio signal processing unit 30a selects the channel selected based on the operation input of the operator. 2 audio signals 11b. Since the second audio signal 11b of the channel desired by the user is thereby generated, the sound of the second audio signal 11b of the channel desired by the user can be output from the external speaker 9. FIG. As a result, the sound of the channel corresponding to the arrangement of the external speaker 9 can be output from the external speaker 9, so that the degree of freedom in the arrangement of the external speaker 9 can be improved.

Other effects of the display device 200 according to the second embodiment are the same as those of the display device 100 according to the first embodiment.

[Third embodiment]
A third embodiment will be described with reference to FIGS. 8 and 9. FIG. In the third embodiment, the control unit 40 (see FIG. 8) included in the display device 300 (see FIG. 8) outputs audio based on the second audio signal 11b from the external speaker 9 based on the operation input by the operator. A configuration that adjusts the timing to be performed will be described.

As shown in FIG. 8, the display device 300 according to the third embodiment differs from the display device 100 according to the first embodiment in that it includes a control section 40 instead of the control section 1. FIG.

The control unit 40 is different from the control unit 1 according to the first embodiment in that it includes an audio signal output unit 40a instead of the audio signal output unit 1c and further includes a second audio signal output timing setting unit 40b. is different.

The second audio signal output timing setting unit 40b is configured to set the output timing of the second audio signal 11b to the external speaker 9 based on the operator's operation input.

The audio signal output unit 40a is configured to adjust the timing of outputting the audio based on the second audio signal 11b from the external speaker 9 based on the operation input by the operator. Specifically, the audio signal output unit 40a outputs the second audio signal 11b according to the output timing of the second audio signal 11b set by the second audio signal output timing setting unit 40b, thereby causing the external speaker 9 to output the second audio signal 11b. 2 is configured to adjust the timing of outputting the audio based on the audio signal 11b.

(Setting the output timing of the second audio signal)
Next, a configuration in which the second audio signal output timing setting unit 40b sets the timing for outputting the second audio signal 11b will be described with reference to FIG.

FIG. 9 shows a speaker output timing adjustment screen 41 displayed on the display unit 4 . The speaker output timing adjustment screen 41 includes a marker 41a indicating the timing of outputting the first audio signal 11a to the built-in speaker 2 and a timing setting bar for setting the timing of outputting the second audio signal 11b to the external speaker 9. 41b, a sample output button 41c, an OK button 41d, and a return button 41e are displayed.

The sample output button 41c is configured to output a sample sound from the built-in speaker 2 and the external speaker 9 by being operated by the operator. The sample output button 41c is a GUI button displayed on the speaker output timing adjustment screen 41. FIG.

The OK button 41 d is a GUI button displayed on the speaker output timing adjustment screen 41 . The output timing of the second audio signal 11b adjusted by the timing setting bar 41b is stored in the storage unit 5 when the OK button 41d is operated. After the output timing of the second audio signal 11b is set, the speaker output timing adjustment screen 41 is closed.

The return button 41 e is a GUI button displayed on the speaker output timing adjustment screen 41 . When the return button 41e is operated, the speaker output timing adjustment screen 41 is closed without setting the output timing of the second audio signal 11b.

When the timing at which the sample sound is output differs between the built-in speaker 2 and the external speaker 9, the operator adjusts the output timing of the sound output from the external speaker 9 by operating the timing setting bar 41b. can do. If the timing of the sound output from the external speaker 9 is desired to be quick, the operator moves the boundary portion 42 of the timing setting bar 41b to the "fast" side (right side in FIG. It is possible to speed up the output timing. If the operator wants to delay the timing of the sound output from the external speaker 9, the operator moves the boundary portion 42 of the timing setting bar 41b to the "slow" side (left side in FIG. You can delay the timing at which the sound is output.

The second audio signal output timing setting unit 40b sets the timing for outputting the second audio signal 11b based on the operation input by the operator. In the third embodiment, for example, the second audio signal output timing setting unit 40b sets the timing for outputting the second audio signal 11b based on the input (the position of the boundary portion 42) of the timing setting bar 41b. Further, in the third embodiment, the second audio signal output timing setting unit 40b stores in the storage unit 5 the set output timing of the second audio signal 11b. In the third embodiment, the second audio signal output timing setting unit 40b, for example, sets the difference between the output timing of the first audio signal 11a and the output timing of the second audio signal 11b. The output timing is stored in the storage unit 5 .

When outputting the first audio signal 11a and the second audio signal 11b, the audio signal output unit 40a acquires the timing of outputting the second audio signal 11b stored in the storage unit 5 in advance. When outputting the first audio signal 11a and the second audio signal 11b, the audio signal output unit 40a adjusts the output timing of the second audio signal 11b based on the acquired timing of outputting the second audio signal 11b. do.

Next, referring to FIG. 10, the process of setting the timing for outputting the second audio signal 11b by the second audio signal output timing setting unit 40b will be described.

At step 20, the second audio signal output timing setting unit 40b determines whether or not an operation input for adjusting the output timing of the second audio signal 11b has been received. Specifically, the second audio signal output timing setting unit 40b determines whether or not an operation input for operating the timing setting bar 41b (see FIG. 9) has been received. If an operation input for operating the timing setting bar 41b is received, the process proceeds to step S21. When the operation input for operating the timing setting bar 41b is not received, the second audio signal output timing setting section 40b repeats the process of step S20.

In step S21, the second audio signal output timing setting unit 40b determines whether or not an operation input for ending adjustment of the output timing of the second audio signal 11b has been received. Specifically, the second audio signal output timing setting unit 40b determines whether or not the OK button 41d (see FIG. 9) has been pressed. If the OK button 41d is pressed, the process proceeds to step S22. If the OK button 41d has not been pressed, the process proceeds to step S23.

In step S22, the second audio signal output timing setting unit 40b sets the output timing of the second audio signal 11b. Specifically, the second audio signal output timing setting unit 40b stores in the storage unit 5 the timing for outputting the second audio signal 11b. After that, the second audio signal output timing setting unit 40 b closes the speaker output timing adjustment screen 41 . After that, the process ends.

When the process proceeds from step S21 to step S23, in step S23, the second audio signal output timing setting unit 40b determines whether or not an operation input to close the speaker output timing adjustment screen 41 has been received. Specifically, the second audio signal output timing setting unit 40b determines whether or not the return button 41e (see FIG. 9) is desired to be pressed. When the return button 41 e is pressed, the second audio signal output timing setting unit 40 b closes the speaker output timing adjustment screen 41 . After that, the process ends. If the return button 41e has not been pressed, the process proceeds to step S20.

Other configurations of the display device 300 according to the third embodiment are the same as those of the display device 100 according to the first embodiment.

(Effect of the third embodiment)
The following effects can be obtained in the third embodiment.

In the third embodiment, as described above, the input reception unit 6 that receives the operator's operation input is further provided, and the audio signal output unit 40a outputs the second audio signal from the external speaker 9 based on the operator's operation input. 11b is configured to adjust the output timing of audio. As a result, it is possible to adjust the timing of outputting the sound based on the second audio signal 11b from the external speaker 9. Therefore, even if it is difficult to control the external speaker 9 by the display device 300, the built-in speaker 2 The audio output from the external speaker 9 can be synchronized with the second audio output from the external speaker 9 . As a result, it is possible to improve the degree of freedom in selecting speakers that can be used as the external speakers 9, thereby improving convenience for the user.

[Modification]
It should be noted that the embodiments disclosed this time should be considered as examples and not restrictive in all respects. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications (modifications) within the meaning and scope equivalent to the scope of the claims.

For example, in the first to third embodiments, the external speaker 9 is a pair of speakers including the first external speaker 9a and the second external speaker 9b. Not limited. For example, the external speaker may be one speaker. If there is only one external speaker, the audio signal processing unit may generate an audio signal based on the rear channel obtained by mixing the rear left channel 20d and the rear right channel 20e. Also, the external speaker 9 may include two or more speakers. For example, in the case of wireless communication using Bluetooth (registered trademark), by providing a plurality of wireless communication units 7, each speaker is determined as an individual set for each paired model and an ID is assigned to each speaker. is identified, data of each channel of the audio signal 11 is assigned to each individual channel of each speaker, and output as each audio signal, thereby constructing a surround environment.

Further, for example, in the first to third embodiments, an example of a configuration in which the audio signal acquisition unit 1a acquires a 5.1-channel audio signal as the surround audio audio signal 11 was shown, but the present invention is similar to this. is not limited to For example, the audio signal acquisition unit 1a may be configured to acquire a three-channel audio signal as the surround audio audio signal 11 . As long as three or more channels are included, the number of channels included in the audio signal 11 does not matter.

For example, the audio signal acquisition unit 1a may acquire a 7.1-channel audio signal as the audio signal. When the audio signal acquisition unit 1a acquires 7.1-channel audio signals of the front left channel, front right channel, center channel, rear left channel, rear right channel, high left channel, highlight channel, and LFE channel. , the audio signal processing unit generates an audio signal based on the rear left channel and the rear right channel as the second audio signal, and generates an audio signal based on the channels other than the rear left channel and the rear right channel as the first audio signal. It may be configured as

Further, when the audio signal acquisition unit 1a acquires a 7.1-channel audio signal as an audio signal, for example, the external speakers may include two pairs of a first external speaker and a second external speaker. . That is, four speakers may be included as external speakers. Note that when four speakers are included as external speakers, the audio signal processing unit divides, for example, an audio signal based on the rear left channel and the rear right channel and an audio signal based on the high left channel and the highlight channel as audio signals. should be generated. Further, the audio signal output unit outputs audio signals based on the rear left channel and the rear right channel to one pair of external speakers, and outputs audio signals based on the high left channel and the highlight channel to the other pair of external speakers. output to the speaker.

In addition, in the above-described first to third embodiments, an example of a configuration in which the built-in speaker and the external speaker include different formats as formats of audio signals that can be output has been shown, but the present invention is not limited to this. . For example, the built-in speaker and the external speaker do not have to include mutually different formats as formats of audio signals that can be output. That is, the built-in speaker and the external speaker may be similar speakers.

Further, in the first to third embodiments, the audio signal processing unit encodes the first audio signal 11a to generate the first audio file 50, and encodes the second audio signal 11b to generate the second audio file. 51 is shown, the present invention is not limited to this. For example, the audio signal processing unit may be configured to encode the first audio signal 11a and the second audio signal 11b as one audio file (third audio file) and then store it in the storage unit 5. . Note that the audio format of the third audio file may be any format. For example, the audio signal processor may generate an audio file in a common format such as mp3 or wav as the third audio file. With this configuration, the third audio file including the first audio signal and the second audio signal is generated, so that the user's convenience can be improved.

Further, in the above-described first to third embodiments, an example of a configuration in which the audio signal processing unit encodes the first audio signal 11a and the second audio signal 11b to generate an audio file having a new audio format is shown. However, the present invention is not limited to this. For example, the audio signal processor may not generate audio files.

Further, in the first to third embodiments, an example of a configuration in which the wireless communication unit 7 and the external speaker 9 are wirelessly connected by Bluetooth (registered trademark) communication has been shown, but the present invention is not limited to this. . For example, the wireless communication unit 7 and the external speaker 9 may be configured to be wirelessly connected by Wi-Fi (registered trademark) communication. Any communication method may be used as long as the wireless communication unit 7 and the external speaker 9 are wirelessly connected.

Further, in the above-described first to third embodiments, an example of a configuration in which the audio signal output section and the built-in speaker are connected by wire has been described, but the present invention is not limited to this. For example, the audio signal output section and the built-in speaker may be wirelessly connected.

Further, in the first to third embodiments, the number of channels that can be output by the built-in speaker 2 is less than the number of channels included in the intermediate audio signal 11c, but the present invention is not limited to this. Absent. For example, the built-in speaker may output more channels than the intermediate audio signal 11c. That is, a speaker capable of 3.1-channel output may be used as the built-in speaker. If the number of channels that can be output by the built-in speaker is not equal to the number of channels included in the intermediate audio signal 11c, the audio signal processing section does not need to mix the channels.

Further, in the first to third embodiments, an example of a configuration in which the display device includes the built-in speaker 2 is shown, but the present invention is not limited to this. For example, the display device may be provided separately from the display device and may include a body-connected speaker wired to the display device.

Further, in the above-described first to third embodiments, an example of a configuration in which the present invention (audio output method) is applied to a display device has been shown, but the present invention is not limited to this. For example, the present invention (audio output method) may be applied to an AV (Audio Visual) amplifier.

In addition, although an example in which each of the first to third embodiments is described as an individual embodiment, the first to third embodiments may be combined. In addition, it may be configured by combining any of the above-described first to third embodiments.

1a audio signal acquisition unit 1b, 30a audio signal processing unit 1c, 40a audio signal output unit 2 built-in speaker (main body connection speaker)
6 Input reception unit 7 Wireless communication unit 8 Display device body 9 External speaker 11 Audio signal 11a First audio signal 11b Second audio signal 20a Front left channel 20b Front right channel 20c Center channel 20d Rear left channel 20e Rear right channel 20f LFE channel 50 first sound file (sound file)
51 second sound file (sound file)
100, 200, 3000 display device

Claims (10)

an audio signal acquisition unit that receives an audio signal of surround audio including three or more channels;
a display device main body including a built-in speaker for outputting a first audio signal, which is the audio signal based on a first channel including at least one of the channels;
generating the first audio signal based on the first channel, extracting a second channel including at least one of the channels different from the first channel, and generating an external speaker based on the extracted second channel an audio signal processing unit that generates a second audio signal, which is the audio signal in a format corresponding to the output format of
and an audio signal output unit that outputs the first audio signal to the built-in speaker and outputs the second audio signal to the external speaker via a wireless communication unit. The audio output format of the external speaker is a stereo format,
2. The display device of claim 1, wherein the audio signal processor is configured to generate the second audio signal in stereo format based on the audio signal of the second channel. the three or more channels include a front left channel, a front right channel, a rear left channel, a rear right channel and a center channel;
said first channel includes said front left channel, said front right channel and said center channel;
the second channel includes the rear left channel and the rear right channel;
The audio signal processing section generates the second audio signal based on the rear left channel and the rear right channel, and the front left channel, which is the channel other than the rear left channel and the rear right channel, the 3. A display device according to claim 1 or 2, arranged to generate said first audio signal based on a front light channel and said center channel. further comprising an input reception unit that receives operation input from the operator,
The audio signal processing unit is configured to generate the second audio signal based on the channel selected based on the operation input by the operator. The display device according to . When the number of channels that can be output by the built-in speaker is smaller than the number of channels other than the second channel among the channels included in the audio signal, the audio signal processing unit outputs the channels other than the second channel. Based on, the first audio signal is generated by interfering the plurality of channels so that the number of channels included in the first audio signal is equal to or less than the number of channels that can be output by the built-in speaker. A display device according to any one of claims 1 to 4, configured. further comprising an input reception unit that receives operation input from the operator,
6. The audio signal processing unit according to any one of claims 1 to 5, wherein the audio signal processing unit is configured to adjust the timing of outputting the audio based on the second audio signal from the external speaker based on the operation input by the operator. 1. The display device according to claim 1. 7. The display device according to any one of claims 1 to 6, wherein said built-in speaker and said external speaker include said formats different from each other as formats of said audio signals that can be output. 8. Any one of claims 1 to 7, wherein the audio signal processor is configured to encode the first audio signal and the second audio signal to generate at least one audio file having a new audio format. 1. The display device according to claim 1. The wireless communication unit is configured to be capable of short-range wireless communication,
9. The audio signal output unit is configured to output the second audio signal to the external speaker by short-range wireless communication via the wireless communication unit. 2. The display device according to item 1. receiving a surround sound audio signal comprising three or more channels;
generating a first audio signal based on a first channel including said channel of at least one of said channels;
extracting a second channel being at least one of said channels different from said first channel;
generating a second audio signal, which is the audio signal in a format corresponding to an output format of an external speaker, based on the extracted second channel;
outputting the first audio signal to a speaker connected to the main body;
and outputting the second audio signal to the external speaker by wireless communication.

Images