JP4945199B2 - Audio adjustment apparatus, method, and program - Google Patents

Description

  The present invention relates to an improvement in technology for processing surround sound.

  In recent years, with the generalization of video and audio works and equipment, so-called surround sound technology has been widely spread and developed (see, for example, Patent Document 1). The so-called 5.1 channel is typical, and surround channels, that is, L (front left), R (front right), C (front center), LFE (deep subwoofer), Ls (rear left), Rs (rear right) The three-dimensional sound, that is, three-dimensional sound image localization, is realized by the sound source of each channel and the respective speakers.

  Such stereophonic sound is realized by the ratio of the sound in each channel and its change, but in the final stage of the output signal in order to protect the transmitter of the broadcasting station and prevent quality degradation due to the level clip of the produced program. Has a built-in dynamic range adjustment function called dynamics. In addition, when using dynamics, if the sound of each channel is generated to create a key signal, the overall balance is lost, and what is not intended by the producer is completed. In order to prevent such a phenomenon, the key signals of the respective channels are balanced and the same level key signals are applied to the respective channels. This is called a link function.

As an example of the audio link function, for example, in the audio adjustment console, among the dynamics such as the sound source level of each channel, the overall effect is adjusted by multiplying the other channel by the one having the maximum effect such as the ratio. There is also known an example in which the combination of channels to be linked in this way can be selected in the form of a group or the like. In the case of a stereo material, L and R are forcibly linked to achieve a balance.
JP 2006-94131 A

  However, in general, the center component in the surround channel is often a completely different sound source that is uncorrelated with the sound effects of other channels, such as comments by announcers. When such a sound source and other channels are used in the same group of the voice link function, there is a problem in that the entire sound image is adversely affected.

  In addition, in order to ensure compatibility with stereo broadcasts and playback devices that do not have 5.1 channels, sound sources such as comments from the center may be transmitted separately into L and R channels using a divergence function or the like. In such a case, the dynamics effect of the center spreads and the sounds of L and R become unnatural, and there is a problem that a desired voice cannot be obtained simply by changing the combination of voice link functions.

  The present invention solves the above-described problems of the prior art, and an object of the present invention is to provide a sound adjustment technique that suppresses the influence of a center component that is different from other channels.

Based on the above object, in one embodiment of the present invention, in the audio adjustment device, the center channel, the input unit that receives sound sources of a plurality of channels including L and R, and among the channels received by the input unit, Canceling means for canceling the same phase component with the sound source of the center channel from the sound source of the L channel and the sound source of the R channel, and the channels including the L and R that have passed through the canceling means are linked to each other according to their dynamics. Link means for outputting as a control key signal, and an output section for processing and outputting the sound source of each channel based on the key signal output from the link means.

  In this way, the component that is in-phase with the center channel at an arbitrary level and canceled from the L and R channels by subtraction or addition after inversion is used as a dynamics key signal, so that the contents are different and uncorrelated with others. The influence of the center component can be suppressed in other channels, and malfunctions of dynamics can be prevented, and high-quality surround programs can be produced with clear sound image localization.

  According to another aspect of the present invention, in the above aspect of reproducing 5.1 channel surround sound of digital audio, among the channels or buses set to surround mode, the combination of sound sources to be linked in the link means For the above, it has a link selection means for selecting an arbitrary pattern according to the received operation.

  In this way, in 5.1 channel digital surround, the combination of sound sources to be linked can be selected in an arbitrary pattern by operation, so that it is possible to easily realize the optimal acoustic effect according to the purpose and circumstances. It becomes.

  According to another aspect of the present invention, in any one of the above aspects, the link selection unit is configured to turn off only the center channel in response to an operation of receiving the link by the link unit. And

  In this way, by making it possible to freely select whether or not to exclude the center channel from the link according to the contents, it is possible to easily realize the optimal acoustic effect according to the work or the scene.

  In addition, each above aspect is the same also about a method and a program.

  As described above, according to the present invention, it is possible to provide a sound adjustment technique that suppresses the influence of a center component that is different from other channels.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, the best mode for carrying out the invention will be described with reference to the drawings. Note that assumptions common to the explanation in the background art and problems are omitted as appropriate.

[1. Constitution〕
This embodiment is an audio adjustment device that processes and reproduces 5.1 channel surround sound of digital audio, and is hereinafter referred to as “this device”. As shown in the block diagram of FIG. 1, the apparatus includes a sound source input unit 10, a cancellation unit 20 that preprocesses the input sound source, a link unit 30 that links the preprocessed channels with each other, An output unit 40 that processes and outputs the sound source of each channel according to the result of the link, and a link selection unit 35 that selects a combination pattern of the target sound sources of the link.

  Each of these elements is a processing means that realizes and executes a function and action as will be described later, and a part related to information processing such as sound in each function is appropriately replaced with a chip of a specific function such as a DSP or a computer program. May be.

[2. (Basic effects)
In the present embodiment configured as described above, the input unit 10 accepts the sound source of a plurality of channels including the center channel and L and R (input processing), and the canceling unit 20 performs the preprocessing as the input unit. Among the channels received in step 10, the same phase component with the sound source of the center channel is canceled from the L and the R as it is or after level adjustment, by subtraction or addition after inversion (cancellation processing). As a method of level adjustment, there are a user setting as a parameter, linking with a divergence function of a pan pot, or automatically checking a correlation between C, L, and R of an input signal and performing level adjustment.

  Then, the link means 30 links the channels including the L and R that have passed through the cancellation means to each other according to their dynamics and outputs them as control key signals (link processing). Based on the key signal output from the link means 30, the sound source of each channel is processed and output (output processing).

  The specific content of the link is that the key signal of the channel that maximizes the effect among the channels to be linked is the key signal of all the channels to be linked.

  In this way, the component that is in-phase with the center channel at an arbitrary level and canceled from the L and R channels by subtraction or addition after inversion is used as a dynamics key signal, so that the contents are different and uncorrelated with others. The influence of the center component can be suppressed in other channels, and malfunctions of dynamics can be prevented, and high-quality surround programs can be produced with clear sound image localization.

[3. (Select link pattern)
In addition, the link selection unit 35 selects an arbitrary pattern according to an operation received from the user with an operation switch or the like for a combination of sound sources to be linked in the link unit 30 among the channels or buses set to the surround mode. (Link selection process) In this way, in 5.1 channel digital surround, the combination of sound sources to be linked can be selected in an arbitrary pattern by operation, so that it is possible to easily realize the optimal acoustic effect according to the purpose and circumstances. It becomes.

[4. (Exclude center channel)
Further, the link selection unit 35 turns off the link by the link unit 30 only for the center channel in response to an operation received from the user by an operation switch or the like. In this way, by making it possible to freely select whether or not to exclude the center channel from the link according to the contents, it is possible to easily realize the optimal acoustic effect according to the work or the scene.

[5. Link pattern example)
The patterns of links (dynamic links) based on the respective dynamics for each channel selected as described above are illustrated in FIG. For example, FIG. 2 is an example in which all channels other than LFE (deep bass subwoofer) are linked.

  Also, FIG. 3 shows that, among the channels other than LFE, front L (front left), R (front right), and C (front center) are one link, rear Ls (rear left), and Rs (rear right). ) Is an example of another link, and C (center) also records the same sound as L and R at a concert or the like, and is suitable when another voice such as a comment does not enter only at the center.

  FIG. 4 shows an example in which LFE and C are made independent, and other L, R, Ls, and Rs are used as one link. FIG. 5 shows L and R of channels other than LFE and C. This is an example in which one link, Ls and Rs, is another link.

  As described above, according to the present invention, it is possible to provide a sound adjustment technique that suppresses the influence of a center component that is different from other channels, so that users such as broadcast stations can enjoy high-quality surround sound. It makes it easy to produce programs freely and efficiently.

The figure which shows the structure of embodiment of this invention. The conceptual diagram which shows an example of the link in embodiment of this invention. The conceptual diagram which shows an example of the link in embodiment of this invention. The conceptual diagram which shows an example of the link in embodiment of this invention. The conceptual diagram which shows an example of the link in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Input part 20 ... Canceling means 30 ... Link means 35 ... Link selection means 40 ... Output part

Claims (9)

A center channel and an input unit for receiving sound sources of a plurality of channels including L and R;
Canceling means for canceling the same phase component with the sound source of the center channel from the L and R among the channels received by the input unit;
Link means for linking the channels including L and R that have passed through the cancellation means to each other according to their dynamics and outputting them as control key signals;
Based on the key signal output from the link means, an output unit that processes and outputs the sound source of each channel;
An audio adjusting device comprising: The sound adjustment device according to claim 1, wherein 5.1 channel surround sound of digital audio is reproduced.
A sound adjustment device comprising: a link selection unit that selects an arbitrary pattern according to an accepted operation for a combination of sound sources to be linked in the link unit among channels or buses set in a surround mode. . 3. The audio adjusting device according to claim 2 , wherein the link selection unit is configured to turn off only the center channel in response to an operation of receiving the link by the link unit. A sound adjustment apparatus comprising: a sound source input unit for each channel; a preprocessing canceling unit; a link unit for linking each channel; and an output unit for processing and outputting the sound source for each channel based on the link In the sound adjustment method using
An input process for receiving a sound source of a plurality of channels including a center channel and L and R by the input unit;
Canceling processing for canceling the same phase component with the sound source of the center channel from the L and R among the channels received by the input unit by the canceling means;
Link processing that links the channels including the L and R that have undergone the cancellation processing to each other according to their dynamics and outputs as a key signal for control by the link means;
Output processing for processing and outputting the sound source of each channel based on the key signal output from the link means by the output unit;
An audio adjustment method comprising: The sound adjustment method according to claim 4, wherein 5.1 channel surround sound of digital audio is reproduced.
A sound adjustment method comprising: a link selection process for selecting an arbitrary pattern in accordance with an accepted operation for a combination of sound sources to be linked in the link process among channels or buses set to a surround mode . 6. The audio adjustment method according to claim 5 , wherein in the link selection process, only the center channel is turned off in response to an operation of accepting the link by the link process. By controlling the arithmetic control unit of the sound adjustment device, the sound source input unit of each channel, the canceling unit for preprocessing, the link unit for linking each channel, and the sound source of each channel based on the link are processed In the audio adjustment program that realizes the output unit
The program controls the arithmetic control unit,
An input process for receiving a sound source of a plurality of channels including a center channel and L and R by the input unit;
Canceling processing for canceling the same phase component with the sound source of the center channel from the L and R among the channels received by the input unit by the canceling means;
Link processing that links the channels including the L and R that have undergone the cancellation processing to each other according to their dynamics and outputs as a key signal for control by the link means;
Output processing for processing and outputting the sound source of each channel based on the key signal output from the link means by the output unit;
A sound adjustment program characterized in that The sound adjustment program according to claim 7, wherein 5.1 channel surround sound of digital audio is reproduced by controlling the arithmetic control unit of the sound adjustment device.
The program controls the arithmetic control unit,
A link selection process for selecting an arbitrary pattern according to an operation received from a user is performed for a combination of sound sources to be linked in the link process among the channels or buses set in the surround mode. Voice adjustment program. The program controls the arithmetic control unit,
9. The sound adjustment program according to claim 8 , wherein, in the link selection process, only the center channel is turned off in response to an operation received from the user for the link by the link process.

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