JP2013157659A - Loudness range control system, transmitting device, receiving device, transmitting program and receiving program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust a loudness range of an audio signal in accordance with a viewing environment, thereby improving the sound quality during viewing.SOLUTION: A loudness range control system includes a transmitting device 10 and a receiving device 20. The transmitting device 10 multiplex an audio signal, a loudness value of the audio signal and control identification information indicating whether or not loudness range control is necessary, and sends the resultant signal to the receiving device 20. If the loudness range control is found to be necessary as a result of referring to the control identification information, the receiving device 20 calculates a loudness adjustment amount for the audio signal on the basis of the loudness value and an adjustment function so as to perform gain adjustment in accordance with the loudness adjustment amount.

Description

  The present invention relates to a loudness range control system, a transmission device, a reception device, a transmission program, and a reception program, and in particular, a loudness range control system that adjusts the loudness range of an audio signal according to each viewing environment, a transmission device, The present invention relates to a receiving device, a transmission program, and a receiving program.

  Audio signals transmitted by broadcast stations, etc. are produced with a wide loudness range so that a natural and high sense of realism can be obtained when played in the same environment as a production studio with low ambient noise and high volume. ing. Here, loudness is not the physical strength of the sound but the loudness of the sound when a person listens, and the loudness range is a small loudness value when the loudness is measured for each time block of the audio signal. The width over the entire audio signal from 1 to a large loudness value is shown (Non-Patent Documents 1 and 2).

  There are various viewing environments for viewing the transmitted audio signal, and the amount of ambient noise, the maximum reproducible volume, and the like are different (Non-Patent Documents 3 and 4). For example, if an audio signal having a wide loudness range is heard in an environment with a large ambient noise, a sound with a small loudness range cannot be heard. Also, when listening at low playback volume in an environment where playback at high volume is difficult, it will be difficult to hear the speech sound that you want to convey, and you will not be able to hear small sounds at all.

RECOMMENDATION ITU-R BS.1770-2 “Algorithms to measure audio program loudness and true-peak audio level”, March 2011. RECOMMENDATION ITU-R BS.1771 “Requirements for loudness and true-peak indicating meters”, September 2011. W. Hoeg “Dynamic RangeControl (DRC) for Multichannel Audio Systems”, JAES Vol.46, No.4, 1998. Hoeg et al. “Dynamic Range Control (DRC) and Music / Speech Control (MSC) Program associated data services for DAB”, EBU Technical Review Autumn 1994.

  Conventionally, there is a method to adjust the level of the audio signal according to the physical strength of the sound so that it can be heard from a low sound to a loud sound even in an environment with a lot of ambient noise or an environment where reproduction at a high volume is difficult. It was devised. However, since the physical strength of the sound is different from the loudness, which is the loudness of the sound when a person hears it, there are cases where it does not necessarily fall within the intended loudness range. In particular, when a broadcast station transmits an audio signal, the viewing environment on the viewer side varies, and based on the loudness, the loudness range of the audio signal is adjusted according to the individual viewing environment to improve the sound quality during viewing. No technology to improve was developed.

  Accordingly, an object of the present invention made in view of such points is to improve the sound quality during viewing by adjusting the loudness range of the audio signal according to the individual viewing environment in which the amount of ambient noise, the maximum reproducible volume, etc. are different. To provide a possible loudness range control system, transmission device, reception device, transmission program, and reception program.

  In order to solve the above-described problems, a loudness range control system according to the present invention includes a transmission device that transmits an audio signal including at least one of a speech signal and a sound effect signal, and a reception device that receives and reproduces the audio signal. A loudness range control system that adjusts a loudness range of the audio signal according to a viewing environment, wherein the transmission device measures an audio signal loudness measurement unit that measures a loudness value of the audio signal, and the speech signal. And a loudness range control determination unit that generates control identification information indicating whether loudness range control is required for the audio signal based on the loudness of the sound effect signal, the audio signal, the loudness value, and the control identification information, That multiplexes and transmits to the receiver A receiver multiplexing unit, and the receiver refers to the control identification information, an amplifier that amplifies the audio signal, a viewing environment setting unit that sets an adjustment function of a loudness range according to the viewing environment, and the control identification information. When loudness range control is required, a loudness adjustment amount for the audio signal is calculated based on the loudness value and the adjustment function, and a gain adjustment value corresponding to the loudness adjustment amount is given to the amplifier. And

  The loudness range control determining unit may determine that the loudness range control is unnecessary when the loudness of the speech signal is greater than a first threshold.

  The loudness range control determination unit may determine that the loudness range control is necessary when the ratio of the loudness of the sound effect signal to the loudness of the speech signal is greater than a second threshold.

  The transmission device according to the present invention is a transmission device that transmits an audio signal including at least one of a speech signal and a sound effect signal, and an audio signal loudness measurement unit that measures a loudness value of the audio signal; and the speech A loudness range control determination unit that generates control identification information indicating whether or not loudness range control is required for the audio signal based on the loudness of the signal and the sound effect signal; the audio signal; the loudness value; and the control identification information. And a metadata multiplexing unit that multiplexes and transmits them.

  Further, the receiving apparatus according to the present invention provides an audio signal including at least one of a speech signal and a sound effect signal from the transmission apparatus, a loudness value of the audio signal, and a control identification indicating whether or not loudness range control is required for the audio signal. A receiver that receives the information and reproduces the audio signal, an amplifier that amplifies the audio signal, a viewing environment setting unit that sets an adjustment function of a loudness range according to the viewing environment, and the control identification When loudness range control is required with reference to information, a loudness adjustment amount for the audio signal is calculated based on the loudness value and the adjustment function, and a gain adjustment value corresponding to the loudness adjustment amount is given to the amplifier. It is characterized by that.

  Although the solution of the present invention has been described as a system and apparatus, the present invention can also be realized as a program for causing a processor of each apparatus to execute an equivalent process (step). It should be understood that these are also included.

  For example, the transmission program according to the present invention includes a step of measuring a loudness value of the audio signal to a transmission device that transmits an audio signal including at least one of a speech signal and a sound effect signal, and the speech signal and the sound effect. Generating control identification information indicating the necessity of loudness range control for the audio signal based on the loudness of the signal; and multiplexing and transmitting the audio signal, the loudness value, and the control identification information; , Execute.

  In addition, the reception program according to the present invention is a control that indicates an audio signal including at least one of a speech signal and a sound effect signal from the transmission device, a loudness value of the audio signal, and whether or not loudness range control is required for the audio signal. A step of amplifying the audio signal, a step of setting an adjustment function of a loudness range according to the viewing environment, and a control identification information. When loudness range control is required, calculating a loudness adjustment amount for the audio signal based on the loudness value and the adjustment function, and providing a gain adjustment value corresponding to the loudness adjustment amount to the amplifier. Let it run.

  According to the loudness range control system, the transmission device, the reception device, the transmission program, and the reception program according to the present invention, the individual viewing environments in which the loudness range of the audio signal differs in the amount of ambient noise, the maximum reproducible volume, and the like. The sound quality during viewing can be improved.

It is a figure which shows the structure of the loudness range control system which concerns on one Embodiment of this invention. It is a figure which shows the structure of the transmission apparatus which concerns on one Embodiment of this invention. It is a figure which shows the example of the time window which prescribes | regulates each audio block of an audio signal. It is an operation | movement flowchart of a loudness range control determination part. It is a figure which shows the structure of the receiver which concerns on one Embodiment of this invention. It is a figure which shows the example of the adjustment function of a loudness range. It is a figure which shows an example of loudness adjustment amount calculation.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a loudness range control system according to an embodiment of the present invention. The loudness range control system according to the present embodiment includes a transmission device 10 and a reception device 20. The transmission device 10 is a broadcasting facility of a broadcasting station that transmits audio signals, for example, and the receiving device 20 is a device for receiving and viewing audio signals, such as a television, a mobile phone, and a tablet terminal. The transmission apparatus 10 according to the present embodiment adds metadata relating to loudness range control (hereinafter referred to as “loudness range control metadata”, details will be described later) to the audio signal and transmits the audio signal to the reception apparatus 20. When receiving the audio signal to which the loudness range control metadata is added, the receiving device 20 adjusts the loudness range of the audio signal in accordance with the viewing environment (ambient noise or maximum reproducible level) based on the loudness range control metadata. .

Here, the audio signal transmitted in the loudness range control system in the present embodiment has the following premise.
(1) Audio signals are produced with a wide loudness range so that a natural and high sense of realism can be obtained when reproduced in an environment similar to a production studio that can reproduce to a large volume with little ambient noise.
(2) Of the components included in the audio signal, the most desired sound, such as a speech signal, is produced within a loudness level range that is easy to hear even in an environment with large ambient noise, and within a substantially constant loudness level range throughout the audio signal. ing. On the other hand, musical sounds and sound effects have a wide loudness range from a small level to a large level in order to make the content natural and highly realistic.
(3) A speech signal and a sound effect signal are individually recorded in the audio signal and are produced based on the intention of the program producer and mixing information operated by the trained sound adjuster.

  FIG. 2 is a diagram illustrating a configuration of the transmission apparatus 10 according to an embodiment of the present invention. The transmission apparatus 10 includes a speech signal loudness measurement unit 11, a sound effect signal loudness measurement unit 12, an audio signal loudness measurement unit 13, an audio signal encoding unit 14, a loudness ratio calculation unit 15, and a loudness range control determination unit. 16 and a metadata multiplexing unit 17.

  The audio signal encoding unit 14 encodes an audio signal including at least one of the speech signal and the sound effect signal for each audio block, and outputs the encoded audio signal (audio encoded signal) to the metadata multiplexing unit 17. FIG. 3 is a diagram illustrating an example of a time window that defines each audio block of an audio signal. As shown, each audio block is defined such that there is an overlap portion between adjacent audio blocks.

  The speech signal loudness measurement unit 11 measures the loudness of the speech signal included in the audio signal for each audio block, and outputs the measured loudness of the speech signal to the loudness ratio calculation unit 15 and the loudness range control determination unit 16. Although details of loudness measurement are not described in detail in this paper, refer to Non-Patent Documents 1 and 2, for example, if necessary.

  The sound effect signal loudness measurement unit 12 measures the loudness of the sound effect signal included in the audio signal for each audio block, and outputs the measured loudness of the sound effect signal to the loudness ratio calculation unit 15.

  The audio signal loudness measuring unit 13 measures the loudness of the entire audio signal for each audio block, and outputs the measured loudness of the audio signal to the metadata multiplexing unit 17. In the following description, the loudness of the entire audio signal measured by the audio signal loudness measuring unit 13 is referred to as “loudness value”.

  The loudness ratio calculation unit 15 calculates the ratio of the loudness of the sound effect signal to the loudness of the speech signal, and outputs the calculated ratio to the loudness range control determination unit 16. In the following description, the ratio of the loudness of the sound effect signal to the loudness of the speech signal calculated by the loudness ratio calculation unit 15 is referred to as “loudness ratio”. That is, when the loudness ratio is small, it means that the loudness of the sound effect signal is small with respect to the loudness of the speech signal, and when the loudness ratio is large, it means that the loudness of the sound effect signal is large with respect to the loudness of the speech signal. To do.

  The loudness range control determination unit 16 determines the necessity (ON / OFF) of the loudness range control for the audio signal based on the loudness of the speech signal and the sound effect signal, and outputs the determination result to the metadata multiplexing unit 17. More specifically, the loudness range control determination unit 16 determines whether or not the loudness range control is necessary based on the loudness of the speech signal and the loudness ratio. In the following description, the determination result generated regarding the necessity of the loudness range control by the loudness range control determination unit 16 is referred to as “control identification information”.

  FIG. 4 is an operation flowchart of the loudness range control determination unit 16. The loudness range control determination unit 16 acquires the speech signal loudness from the speech signal loudness measurement unit 11 (step S1), and acquires the loudness ratio from the loudness ratio calculation unit 15 (step S2). When the loudness of the speech signal is larger than the predetermined threshold Th1 (first threshold) (Yes in Step S3), the loudness range control determination unit 16 sets the loudness range control to OFF (unnecessary) (Step S6). This is because the speech signal is set in advance within a loudness level range that is easy to hear even in an environment with large ambient noise. On the other hand, when the loudness of the speech signal is equal to or less than the predetermined threshold Th1 (No in Step S3), the loudness range control determination unit 16 compares the loudness ratio with the predetermined threshold Th2 (second threshold) (Step S4). . When the loudness ratio is larger than the predetermined threshold Th2 (Yes in step S4), the loudness range control determination unit 16 sets the loudness range control to ON (necessary) (step S5). This is because when the loudness of the sound effect signal is large relative to the loudness of the speech signal, the sound effect signal has a wide loudness range, and in particular, the effect of adjusting the loudness range is enhanced. The loudness range control determination unit 16 sets the loudness range control to OFF (unnecessary) when the loudness ratio is equal to or less than the predetermined threshold Th2 (step S6). This is because when the loudness of the sound effect signal with respect to the loudness of the speech signal is small, the effect of adjusting the loudness range of the sound effect signal is low, and the speech signal may be difficult to hear due to the adjustment of the loudness range.

  The metadata multiplexing unit 17 multiplexes a loudness value and control identification information, which are loudness range control metadata, into the encoded audio signal in synchronization with each audio block, and transmits the multiplexed audio signal to the receiving device 20 by an antenna (not shown). Transmit multiplexed audio signal and loudness range control metadata.

  FIG. 5 is a diagram illustrating a configuration of the receiving device 20 according to an embodiment of the present invention. The receiving device 20 includes a metadata separation unit 21, a loudness adjustment amount calculation unit 22, a viewing environment setting unit 23 including an adjustment function storage unit 24, an audio signal decoding unit 25, an amplifier 26, a delay unit 27, And an adding unit 28.

  The metadata separation unit 21 separates a signal received from the transmission apparatus 10 by an antenna (not shown) into an encoded audio signal and loudness range control metadata (loudness value, control identification information), and loudness range control metadata. (Loudness value, control identification information) is output to the loudness adjustment amount calculation unit 22, and the encoded audio signal is output to the audio signal decoding unit 25.

  The viewing environment setting unit 23 includes an adjustment function storage unit 24 that stores an adjustment function of a loudness range corresponding to various viewing environments (ambient noise and maximum reproducible level). The result is output to the adjustment amount calculation unit 22. The viewing environment setting unit 23 can determine the viewing environment by, for example, measuring ambient noise with a noise sensor or the like, or receiving an input of a maximum reproducible level from a user of the receiving device 20 or the like.

  FIG. 6 is a diagram illustrating an example of an adjustment function for the loudness range. The adjustment functions shown in FIGS. 6A to 6C show the relationship between the input loudness (horizontal axis) and the output loudness (vertical axis). In general, the adjustment function converts an input audio signal into an audio signal having a narrow loudness range as the ambient noise becomes louder and the environment in which reproduction at high volume becomes difficult. This makes it possible to listen to all sounds contained in audio content even in environments where there is a lot of ambient noise or where playback at high volume is difficult, and a realistic sound suitable for the listening environment is realized. The sound quality is improved.

  FIG. 6A shows an example of an adjustment function when the viewing environment is relatively good. As shown in the figure, the gradient of the adjustment function varies depending on the input loudness interval, but basically the input loudness is converted into the output loudness at a constant rate (gradient). Therefore, in the adjustment function, the loudness of the original audio signal is changed. The range can be maintained relatively.

  FIG. 6B shows an example of an adjustment function when there is more noise than in FIG. 6A and the maximum volume is low. As shown in the figure, an input loudness of −54 or less is converted to a uniform output loudness of −36, and an input loudness of 12 or more is converted to a uniform output loudness of 6. Therefore, in the adjustment function, the loudness range is Although it becomes narrower, the audio signal can be easily heard even in an environment where there is a lot of ambient noise, and it can be viewed at a lower maximum volume.

  FIG. 6C shows an example of an adjustment function when there is more noise than in FIG. 6B and the maximum volume is low. As shown in the figure, an input loudness of −36 or less is converted to a uniform output loudness of −27, and an input loudness of 0 or more is converted to a uniform output loudness of 0. Therefore, in the adjustment function, the loudness range is Even if the surrounding environment is worse, the audio signal is not easily heard, and the maximum volume can be further reduced for viewing.

  The loudness adjustment amount calculation unit 22 refers to the control identification information, and when the loudness range control is ON, calculates the loudness adjustment amount for the audio signal based on the adjustment function from the viewing environment setting unit 23, and the loudness adjustment amount. The gain adjustment value corresponding to is output to the amplifier 26. On the other hand, the loudness adjustment amount calculation unit 22 refers to the control identification information, and when the loudness range control is OFF, the loudness range is not adjusted and the gain adjustment value is not output to the amplifier 26.

  FIG. 7 is a diagram illustrating an example of calculating the loudness adjustment amount. The solid line in FIG. 7A indicates the loudness range adjustment function (corresponding to FIG. 6B), and the dotted line indicates a state in which the loudness range is not adjusted. FIG. 7B is a graph in which the difference between the adjustment function of FIG. 7A and the case where no adjustment is performed is plotted. The loudness adjustment amount calculation unit 22 can calculate the loudness adjustment amount for each audio block of the audio signal from the graph. For example, when the loudness value of the audio signal is −54, the loudness adjustment amount calculation unit 22 can calculate 18 as the loudness adjustment amount. When the loudness range control is ON, the loudness adjustment amount calculation unit 22 outputs a gain adjustment value corresponding to the loudness adjustment amount to the amplifier 26.

  The audio signal decoding unit 25 decodes the encoded audio signal and outputs it to the amplifier 26 for amplification.

  The amplifier 26 amplifies the decoded audio signal with a predetermined gain, and outputs the amplified audio signal to the delay unit 27 and the addition unit 28. Further, when the amplifier 26 receives the gain adjustment value from the loudness adjustment amount calculation unit 22, the amplifier 26 amplifies the audio signal with the gain adjusted by the gain adjustment value. Therefore, when the loudness range control is OFF, the amplifier 26 outputs the sound intensity according to the loudness of the original audio signal, and when the loudness range control is ON, the amplifier 26 enters the viewing environment according to the gain adjustment value. A suitable sound intensity will be output.

  The delay unit 27 adds a certain delay corresponding to the overlap time to the signal of the overlap portion with the subsequent audio block in order to appropriately synthesize the portion that overlaps with the subsequent audio block in the addition unit 28. After the addition, the result is output to the adding unit 28.

  The adder unit 28 appropriately synthesizes the overlap portion between adjacent audio blocks for the audio signal from the amplifier 26 and the audio signal from the delay unit 27, and sends the audio signal to the viewer through a notification device such as a speaker (not shown). Play the signal as sound.

  Thus, according to the present embodiment, the transmission device 10 multiplexes the audio signal, the loudness value, and the control identification information and transmits the multiplexed information to the reception device 20, and the reception device 20 refers to the control identification information. When loudness range control is required, a loudness adjustment amount for the audio signal is calculated based on the loudness value and an adjustment function corresponding to the viewing environment, and gain adjustment is performed according to the loudness adjustment amount. As a result, the loudness range of the audio signal can be adjusted according to the individual viewing environment in which the level of ambient noise, the maximum reproducible volume, and the like are different, and the sound quality during viewing can be improved. In other words, even in environments where there is a lot of ambient noise or where playback at high volume is difficult, it is possible to listen to all sounds contained in audio content, and a realistic sound suitable for the viewing environment is realized. The sound quality is improved.

  In addition, when the loudness range control determination unit 16 of the transmission apparatus 10 has a loudness greater than the first threshold, the loudness range control is determined to be unnecessary. As a result, it is possible to reproduce a speech signal set in advance within a loudness level range that is easy to hear even in an environment with large ambient noise.

  The loudness range control determination unit 16 of the transmission apparatus 10 determines that the loudness range control is necessary when the ratio of the loudness of the sound effect signal to the loudness of the speech signal (loudness ratio) is larger than the second threshold value. Thereby, since the sound effect signal has a wide loudness range, the effect of adjusting the loudness range is particularly enhanced, and the sound quality at the time of listening can be improved.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each functional unit, each step, etc. can be rearranged so that there is no logical contradiction, and a plurality of functional units, steps, etc. can be combined into one or divided. It is.

  For example, the frequency band of the audio signal can be divided into a plurality of frequency bands having a critical auditory bandwidth, and the loudness range control in the above embodiment can be performed separately for each frequency band. For example, an audio signal can be divided into a frequency band of a speech signal and a frequency band of a sound effect signal, and loudness range control can be performed individually for each frequency band. In this case, in the frequency band of the speech signal, the loudness range control is turned off and the speech signal is output as the original loudness. In the frequency band device of the sound effect signal, the loudness range control is turned on and the loudness range is adjusted. Can be output.

  Moreover, although the said embodiment has described the audio signal of a single channel as an example, it can be extended to the acoustic signal with many channels, such as a 2-channel acoustic signal and a 5.1 channel surround acoustic signal. Needless to say.

  ADVANTAGE OF THE INVENTION According to this invention, the loudness range of an audio signal can be adjusted according to each viewing environment from which the magnitude of ambient noise, the maximum reproducible volume, etc. differ, and the sound quality at the time of viewing can be improved.

DESCRIPTION OF SYMBOLS 10 Transmission apparatus 11 Speech signal loudness measurement part 12 Sound effect signal loudness measurement part 13 Audio signal loudness measurement part 14 Audio signal encoding part 15 Loudness ratio calculation part 16 Loudness range control determination part 16
DESCRIPTION OF SYMBOLS 17 Metadata multiplexing part 20 Receiving device 21 Metadata separation part 22 Loudness adjustment amount calculation part 23 Viewing environment setting part 24 Adjustment function memory | storage part 25 Audio signal decoding part 26 Amplifier 27 Delay part 28 Adder part

Claims (7)

A loudness that includes a transmission device that transmits an audio signal including at least one of a speech signal and a sound effect signal, and a reception device that receives and reproduces the audio signal, and adjusts a loudness range of the audio signal according to a viewing environment. A range control system,
The transmission apparatus is
An audio signal loudness measuring unit for measuring a loudness value of the audio signal;
Based on the loudness of the speech signal and the sound effect signal, a loudness range control determination unit that generates control identification information indicating whether or not loudness range control is required for the audio signal;
A metadata multiplexing unit that multiplexes the audio signal, the loudness value, and the control identification information and transmits the multiplexed information to the receiving device;
The receiving device is:
An amplifier for amplifying the audio signal;
A viewing environment setting unit that sets an adjustment function of a loudness range according to the viewing environment;
When loudness range control is required with reference to the control identification information, a loudness adjustment amount for the audio signal is calculated based on the loudness value and the adjustment function, and a gain adjustment value corresponding to the loudness adjustment amount is calculated. A loudness range control system characterized by being given to an amplifier.   The loudness range control system according to claim 1, wherein the loudness range control determination unit determines that the loudness range control is unnecessary when the loudness of the speech signal is greater than a first threshold.   3. The loudness range control determining unit determines that the loudness range control is necessary when a ratio of a loudness of the sound effect signal to a loudness of the speech signal is larger than a second threshold value. The loudness range control system described in 1. A transmission device for transmitting an audio signal including at least one of a speech signal and a sound effect signal,
An audio signal loudness measuring unit for measuring a loudness value of the audio signal;
Based on the loudness of the speech signal and the sound effect signal, a loudness range control determination unit that generates control identification information indicating whether or not loudness range control is required for the audio signal;
A transmission apparatus comprising: a metadata multiplexing unit that multiplexes and transmits the audio signal, the loudness value, and the control identification information. An audio signal including at least one of a speech signal and a sound effect signal, a loudness value of the audio signal, and control identification information indicating whether or not loudness range control is required for the audio signal are received from a transmission device, and the audio signal is received. A receiving device for playback,
An amplifier for amplifying the audio signal;
A viewing environment setting unit that sets an adjustment function of a loudness range according to the viewing environment;
When loudness range control is required with reference to the control identification information, a loudness adjustment amount for the audio signal is calculated based on the loudness value and the adjustment function, and a gain adjustment value corresponding to the loudness adjustment amount is calculated. A receiving device characterized by being provided to an amplifier. In a transmission device for transmitting an audio signal including at least one of a speech signal and a sound effect signal,
Measuring a loudness value of the audio signal;
Generating control identification information indicating the necessity of loudness range control for the audio signal based on the loudness of the speech signal and the sound effect signal;
A transmission program for executing the step of multiplexing and transmitting the audio signal, the loudness value, and the control identification information. An audio signal including at least one of a speech signal and a sound effect signal, a loudness value of the audio signal, and control identification information indicating whether or not loudness range control is required for the audio signal are received from a transmission device, and the audio signal is received. To the receiving device to play
Amplifying the audio signal;
Setting a loudness range adjustment function in accordance with the viewing environment;
When loudness range control is required with reference to the control identification information, a loudness adjustment amount for the audio signal is calculated based on the loudness value and the adjustment function, and a gain adjustment value corresponding to the loudness adjustment amount is calculated. And a receiving program for executing the steps to be given to the amplifier.

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