JP6487764B2 - Volume monitoring device and program - Google Patents

Description

  The present invention relates to a volume monitoring device and a program for measuring the volume of a program during program production.

  Conventionally, program audio level management has been performed using a VU (Volume Unit) meter or the like so that instantaneous values of audio signals do not overshoot. However, these volume monitoring devices are devices that show the instantaneous value of the audio level, and are not suitable for managing the audio level throughout the entire program.

  In recent years, therefore, program audio levels have been managed based on the average loudness value calculated by the loudness measurement method defined in Non-Patent Document 1. Further, according to Non-Patent Document 2, the operating rules are defined so that the average loudness value throughout the program falls within an allowable range (± 1 dB) of the target loudness value (−24LKFS).

Recommendation ITU-R BS.1770-3, “Algorithms to measure audio program loudness and true-peak audio level” ARIB TR-B32, “Loudness Operation Rules for Digital TV Broadcast Programs”

  In the loudness measurement method defined in Non-Patent Document 1, an input audio signal is moved at 100 ms intervals, cut out in blocks of 400 ms (gating blocks), and a loudness value (gating block crowdness value) of each gating block is obtained. calculate. An audio signal below a certain level is said not to contribute to auditory loudness, and when the gating block crowdness value falls below the absolute threshold (−70LKFS) (absolute gating), or the loudness value after absolute gating (this specification) If it is below a relative threshold 10 dB lower (relative gating) than the “absolute loudness value” in the book, it is not used to calculate the average loudness value of the entire program.

  The loudness measurement method defined in Non-Patent Document 1 is a gating block having a value in the vicinity of a threshold value because an input audio signal is uniformly moved at 100 ms intervals after the start of measurement and is cut out in blocks (gating blocks) in a 400 ms section. When measuring a large number of program sounds, if the measurement start time is changed manually, the final average loudness value may fluctuate beyond an allowable range. Even when the measurement start time is accurately managed using a time code or the like, the average loudness value of the entire program may change when the edit point is finely adjusted, such as by matching the lip sync.

  An object of the present invention made in view of such circumstances is to provide a volume monitoring device and a program with high reproducibility of measurement results even when the measurement start time changes.

  In order to solve the above problems, a volume monitoring apparatus according to the present invention is a volume monitoring apparatus for measuring the volume of an input audio signal, and is configured to extract an input audio signal while moving a start position of extraction. An audio signal cutout unit that cuts out in a section and generates a plurality of gating blocks, an absolute gating determination unit that determines whether a volume level of the gating block exceeds an absolute threshold, and the absolute gating determination unit An average loudness value calculating unit that calculates an average loudness value using a gating block that has been determined that the volume level exceeds the absolute threshold, and the audio signal cutout unit includes the absolute gating determination unit The amount of movement of the cutout start position is set to a different value in accordance with the determination result by (1).

  Furthermore, in the sound volume monitoring device according to the present invention, the average loudness value calculation unit calculates an absolute loudness value that calculates an absolute loudness value that is a loudness value of a gating block in which the sound volume level is determined to exceed the absolute threshold. And an average loudness value in a section from a measurement start time to a measurement end time, or a section of the entire audio signal, using a gating block determined to exceed a relative threshold relatively calculated from the absolute loudness value. And a final loudness value calculation unit for calculating.

  Further, in the sound volume monitoring device according to the present invention, the audio signal cutout unit may calculate the movement amount of the cutout start position when the absolute gating determination unit determines that the volume level is equal to or less than the absolute threshold value. When the first slide width is shorter than the second slide width, which is a predetermined slide width, and the volume level is determined to exceed the absolute threshold, the movement amount of the cutout start position is set to the second slide width. It is characterized by a slide width.

  Furthermore, in the sound volume monitoring device according to the present invention, the audio signal cutout unit moves the cutout start position until the absolute gating determination unit determines that the volume level exceeds the absolute threshold. Is the first slide width shorter than the second slide width, which is a predetermined slide width, and after it is determined that the volume level has exceeded the absolute threshold, the amount of movement of the cutout start position until the measurement is completed Is the second slide width.

  Further, in the sound volume monitoring device according to the present invention, the sound signal cutout unit may be configured to cut out the sound volume level as the sound volume level increases when the absolute gating determination unit determines that the sound volume level is equal to or lower than the absolute threshold value. The amount of movement of the start position is changed so as to be short, and when it is determined that the volume level exceeds the absolute threshold, the amount of movement of the cutout start position is made constant.

  In order to solve the above problems, a program according to the present invention causes a computer to function as the volume monitoring device.

  According to the present invention, even when the measurement start time changes or the edit point is finely adjusted, the analysis start time can be detected with high accuracy, and the average loudness value can be obtained with high reproduction accuracy.

It is a block diagram which shows the structural example of the volume monitoring apparatus which concerns on this invention. It is a block diagram which shows the structural example of the audio | voice signal analysis part in the volume monitoring apparatus which concerns on this invention. It is a figure which shows the example of extraction of the audio | voice signal in the audio | voice signal analysis part in the volume monitoring apparatus which concerns on this invention. It is a figure explaining the calculation in the audio | voice signal analysis part in the volume monitoring apparatus which concerns on this invention. It is a block diagram which shows the structural example of the slide width determination part in the volume monitoring apparatus which concerns on this invention. It is a flowchart which shows the 1st operation example of the volume monitoring apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the 2nd operation example of the volume monitoring apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the example of a movement of the cut-out start position of the volume monitoring apparatus which concerns on the 2nd Embodiment of this invention.

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

(First embodiment)
FIG. 1 is a block diagram illustrating a configuration example of a volume monitoring apparatus according to an embodiment of the present invention. In the example illustrated in FIG. 1, the volume monitoring device 1 includes an audio signal analysis unit 10, a slide width determination unit 20, and an average loudness value calculation unit 60. The average loudness value calculation unit 60 includes an absolute loudness value calculation unit 30, a final loudness value calculation unit 40, and a time series data storage unit 50. A measurement start signal is input to the audio signal analyzer 10. In this embodiment, the measurement start signal is a signal indicating the measurement start time, but may be a signal instructing the start of measurement. In addition, a measurement end signal is input to the absolute loudness value calculation unit 30. In the present embodiment, the measurement end signal is a signal indicating the measurement end time, but may be a signal instructing the end of the measurement. When measuring from the beginning to the end of the audio file, the measurement start signal and the measurement end signal are not necessary.

  The sound volume monitoring device 1 analyzes the input audio signal, searches the head position of the sound section with high accuracy, and outputs the average loudness value to the display device 2. Note that the volume monitoring device 1 may include the display device 2. Here, the head position of the sound section includes not only the first time when the sound is input in the input audio signal (analysis start time) but also the time when the sound becomes sound again after silence.

  FIG. 2 is a block diagram illustrating a configuration example of the audio signal analysis unit 10. In the example illustrated in FIG. 2, the audio signal analysis unit 10 includes a plurality of audio signal extraction units 11 (11-1 to 11-5), a plurality of filter processing units 12 (12-1 to 12-5), A plurality of mean square processing units 13 (13-1 to 13-5), a plurality of weight coefficient processing units 14 (14-1 to 14-5), and an addition processing unit 15 are provided. Here, an example in which the number of channels is 5 is shown.

  When the designated measurement start time is reached, the audio signal cutout unit 11 cuts out the input audio signal for each channel in a predetermined cutout section while moving the cutout start position (that is, overlapping). A ting block is generated and output to the filter processing unit 12. The moving amount (slide width) of the cutout start position is set to a different value according to an absolute gating determination signal input from the slide width determination unit 20 described later.

  For example, when the 1-bit absolute gating determination signal is “0”, the audio signal extraction unit 11 sets the movement amount of the extraction start position as the first slide width, and the absolute gating determination signal is “1”. In the case of ', the movement amount of the cutout start position is set as the second slide width longer than the first slide width. Here, the second slide width is a predetermined slide width determined in advance, and the first slide width only needs to be shorter.

  Alternatively, the audio signal cutout unit 11 sets the movement amount of the cutout start position as the first slide width until the 1-bit absolute gating determination signal becomes “1”, and the absolute gating determination signal is “1”. After “”, the moving amount of the cutout position is set to the second slide width longer than the first slide width until the measurement is completed.

  FIG. 3A is a diagram illustrating an example of audio signal extraction in the audio signal extraction unit 11. FIG. 3B shows an example of cutting out a conventional audio signal for comparison. Conventionally, the recommendation ITU-R BS. In accordance with the definition of 1770, as shown in FIG. 3B, the cutout start position of the audio signal is moved by the slide width a and cut out while overlapping to generate a gating block. The slide width a which is the second slide width is 100 ms, and the cut-out section (gating block length) is 400 ms.

  On the other hand, in the present invention, as shown in FIG. 3A, when the absolute gating determination signal is “0”, the cut start position is moved by the slide width b, and the absolute gating determination signal is “1”. Is moved by the slide width a. The slide width b which is the first slide width is shorter than the slide width a (100 ms), for example, 10 ms.

  The filter processing unit 12 filters the audio signal extracted by the audio signal extraction unit 11 with a K characteristic filter and outputs the filtered signal to the root mean square processing unit 13.

The mean square processing unit 13 calculates the mean square value z _i of the data processed by the filter processing unit 12 and outputs the calculated value to the weighting coefficient processing unit 14. Note that the subscript i means a channel.

The weighting factor processing unit 14 multiplies the mean square value z _i calculated by the mean square processing unit 13 by the weighting factor G _i determined for each channel i, and outputs z _i · G _i to the addition processing unit 15. .

The addition processing unit 15 adds the values calculated by the weight coefficient processing unit 14 for each channel, and outputs the addition value _St to the slide width determination unit 20.

FIG. 4 is a diagram for explaining calculation in the audio signal analysis unit 10. When the cutout start position is moved with a slide width b shorter than the slide width a, the number of gating blocks increases compared to the conventional case, and the audio signals included in the gating blocks overlap. _t will be calculated. Therefore, as shown in FIG. 4, instead of calculating the addition value for each gating block, the addition value is calculated for each slide width b, and the calculation process of the audio signal in the overlapping section is performed only once. You may do it. In this case, to keep the sum of each slide width b to each storage unit, the added value of the cut-out section _{t 1 ~t n S (t 1} : t n) from the time t ₁ of the sum value S (t ₁₎ the subtraction, by adding the time t _{n + 1} of the sum S (t n _{+ 1),} cut out section t ₂ ~t n + ₁ of the sum _{S (t 2: t n +} 1) to obtain Can do. Thereby, calculation time can be reduced.

  FIG. 5 is a block diagram illustrating a configuration example of the slide width determination unit 20. In the example illustrated in FIG. 5, the slide width determination unit 20 includes a gating loudness value calculation unit 21 and an absolute gating determination unit 22.

Gating loudness value calculating section 21 calculates a loudness value (gating block loudness value) L _t of each gating block by equation (1) using the sum value S _t calculated by the addition processing section 15, an absolute Output to the gating determination unit 22.

The absolute gating determination unit 22 determines whether or not the gating loudness value L _t calculated by the gating loudness value calculation unit 21 exceeds the absolute threshold (−70LKFS), and the 1-bit absolute gating indicating the determination result. the coating determination signal and outputs the audio signal cutting unit 11, only when the gating loudness value L _t exceeds the absolute threshold, and outputs the addition value S _t to the absolute loudness value calculating unit 30. Hereinafter, the gating block gating loudness value L _t exceeds the absolute threshold referred to as "valid block", gating loudness value L _t is referred to as absolute threshold following gating block "invalid block".

In the slide width determination unit 20 of the present embodiment, the gating loudness value calculation unit 21 calculates the gating loudness value, and the absolute gating determination unit 22 determines the threshold value of the gating loudness value. The previous addition value may be determined as a threshold. That is, the additional value corresponding to the absolute threshold (-70LKFS) and S _a, if S _t is less than S _a is '0', 1-bit S _t is A '1' in the case of more than S _a The absolute gating determination signal may be output. In this case, since the gating loudness value is not calculated by the slide width determination unit 20, the calculation amount can be reduced.

When the absolute gating determination signal is “0”, the absolute loudness value calculation unit 30 determines that this gating block is an invalid block that does not contribute to the sound volume of the entire program in terms of hearing, and calculates the average loudness value. Do not use. On the other hand, when the absolute gating determination signal is “1”, this gating block is used for calculation of the average loudness value because it is an effective block that contributes to the loudness of the entire program in terms of hearing. Therefore, the absolute loudness value calculating unit 30, the absolute gating determination unit addition value is input from the 22 S _t, i.e. records the sum value S _t of the effective blocks in the time series data storage unit 50, the number of valid blocks k Count. When the designated measurement end time is reached or the audio signal is reproduced to the end, the absolute loudness value calculation unit 30 first adds each effective block in order to calculate the average loudness value of the final program. It calculates an average value S _KGA obtained by dividing the sum of values S _t by the number k of active blocks. Then, a loudness value (absolute loudness value) L _KGA after absolute gating is calculated by Equation (2) and output to the final loudness value calculation unit 40.

The final loudness value calculation unit 40 uses a threshold value relatively obtained from the absolute loudness value calculated by the absolute loudness value calculation unit 30 (for example, a value obtained by subtracting 10 dB from the absolute loudness value) as a relative threshold value. L _t is extracted once only sum values S _t gating block or relative threshold from time-series data storage unit 50, calculates the average value S _KG of the sum value S _t. Then, the average loudness value L _KG of the final program is calculated by Expression (3) and output to the display device 2. That is, the average loudness value calculation unit 60 calculates a relative threshold using the gating block determined by the absolute gating determination unit 22 that the added value exceeds the absolute threshold, and the gating determined to exceed the relative threshold. Using the block, the average loudness value L _KG in the section from the measurement start time to the measurement end time of the audio signal or the entire audio signal is calculated.

  Next, the operation of the volume monitoring device 1 of the present embodiment will be described. FIG. 6 is a flowchart showing an operation example of the volume monitoring device 1 of the present embodiment.

  First, the audio signal extraction unit 11 determines an audio signal extraction start position based on the value of an absolute gating determination signal A described later (step S101). Specifically, when the absolute gating determination signal A = '1' (step S105), the cutout start position is moved by the slide width a, and when the absolute gating determination signal A = '0' ( Step S106), the cutout start position is moved by the slide width b. Alternatively, the cut start position is moved by the slide width b until the absolute gating determination signal A = '1', and after the absolute gating determination signal becomes '1', the cut start position is set to the slide width. Move only a. Then, the audio signal cutout unit 11 cuts out a voice signal for a predetermined cutout section from the cutout start position determined in step S101, and generates a gating block (step S102).

When the addition value is calculated by the audio signal analysis unit 10, the gating loudness value calculation unit 21 calculates the gating loudness value L _t using the addition value (step S103). Absolute gating determination unit 22, gating loudness value L _t calculated in step S103, it is determined whether or not more than the absolute threshold (-70LKFS), generates an absolute gating judgment signal A indicating the determination result ( Step S104). When the gating loudness value L _t exceeds the absolute threshold, the absolute gating determination signal A is set to “1” (step S105). When the gating loudness value L _t is equal to or less than the absolute threshold, the absolute gating determination signal A is set. = '0' (step S106).

In step S104, if the gating loudness value L _t is determined to exceed the absolute threshold, the absolute loudness value calculating unit 30, the time series data storage unit 50 the added value calculated by the audio signal analyzer 10 Save (step S107). When the designated measurement end time is reached or the audio signal is reproduced to the end, the absolute loudness value calculation unit 30 calculates the absolute loudness value from the average value of the addition values stored in the time series data storage unit 50. Is calculated (step S108). The final loudness value calculation unit 40 performs a relative gating process on the absolute loudness value calculated in step S108 to calculate a final average loudness value (step S109).

  In this embodiment, the absolute threshold is set to −70 LKFS, but the target value is set to −24 LKFS in the program production operation regulations. Therefore, since the relative threshold value is assumed to be in the vicinity of −34LKFS obtained by subtracting 10 dB from the target value, the threshold value for examining the optimal analysis start time may be set to −34LKFS.

  As described above, the volume monitoring device 1 according to the first embodiment moves the cutout start position of the audio signal depending on whether or not the volume level (for example, the gating loudness value) of the gating block exceeds the absolute threshold. The amount is a different value. If the absolute gating determination unit 22 determines that the volume level is equal to or less than the absolute threshold, the movement amount of the cutout start position is set to the first slide width shorter than the second slide width, which is a predetermined slide width, When it is determined that the level exceeds the absolute threshold, the start position of the sound section can be detected with high accuracy by setting the movement amount of the cutout start position as the second slide width. Further, until the volume level exceeds the absolute threshold by the absolute gating determination unit 22, the movement amount of the cutout start position is set to the first slide width shorter than the second slide width which is a predetermined slide width, and the volume level is set. After the measurement exceeds the absolute threshold, the analysis start time can be detected with high accuracy and the calculation amount can be increased by setting the movement amount of the cutout start position as the second slide width until the measurement is completed. Can be prevented. As a result, the average loudness of the entire program can be obtained by targeting only the sound section in the entire program. Therefore, according to the present invention, even when the measurement start time changes, such as by finely adjusting the editing point, the result of the average loudness value of the entire program to be obtained can be obtained with high reproducibility.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The configuration of the second embodiment is the same as that of the first embodiment, but the processing of the audio signal extraction unit 11 and the absolute gating determination unit 22 is different. Since the processing in the other constituent blocks is the same as that in the first embodiment, description thereof is omitted.

Audio signal cutting unit 11 of the present embodiment, when the absolute gating determination unit 22 is gated loudness value L _t and sum value S _t volume level, etc. is determined to be equal to or smaller than the absolute threshold, the volume level is increased The amount of movement of the cutout start position is changed to be shorter. The amount of movement may be changed continuously according to the volume level, or may be changed in stages. On the other hand, when the absolute gating determination unit 22 determines that the volume level exceeds the absolute threshold, the amount of movement of the cutout start position is set constant.

  Hereinafter, an example will be described in which, when the absolute gating determination unit 22 determines that the volume level is equal to or less than the absolute threshold, the audio signal extraction unit 11 changes the movement amount of the extraction start position in a stepwise manner.

The absolute gating determination unit 22 provides a plurality of threshold values, and determines the magnitude relationship between the gating loudness value L _t calculated by the gating loudness value calculation unit 21 and the plurality of threshold values. For example, the threshold value is set to −70 LKFS, −80 LKFS, −90 LKFS, −100 LKFS, and the absolute gating determination unit 22 has a gating loudness value L _t of −100 LKFS or less, or is within a range of −100 LKFS to −90 LKFS, It is determined whether it is within the range of −90 LKFS to −80 LKFS, within the range of −80 LKFS to −70 LKFS, or exceeds −70 LKFS, and an absolute gating determination signal indicating the determination result is sent to the audio signal cutting unit 11. and outputs, only when the gating loudness value L _t exceeds -70LKFS, and outputs the addition value S _t to the absolute loudness value calculating unit 30.

The audio signal cutout unit 11 changes the slide width based on the absolute gating determination signal. For example, when the gating loudness value L _t is −100 LKFS or less, the slide width b is set to 100 ms, when the gating loudness value L _t is within the range of −100 LKFS to −90 LKFS, the slide width b is set to 50 ms, and −90 LKFS to −80 LKFS. If it is within the range, the slide width b is 10 ms. If it is within the range of −80 LKFS to −70 LKFS, the slide width b is 5 ms. If it exceeds −70 LKFS, the slide width a is 100 ms as before. .

  Next, the operation of the volume monitoring device 1 of the present embodiment will be described. FIG. 7 is a flowchart showing an operation example of the volume monitoring device 1 of the present embodiment.

  First, the audio signal extraction unit 11 determines an audio signal extraction start position based on the value of an absolute gating determination signal A described later (step S201). For example, when the absolute gating determination signal A = “100” (step S202), the cut start position is moved by 100 ms (slide width a), and when the absolute gating determination signal A = “000” ( In step S204), when the cutout start position is moved by 100 ms and the absolute gating determination signal A = '001' (step S206), the cutout start position is moved by 50 ms and the absolute gating determination signal A = '010. In the case of '(step S208), the cutout start position is moved by 10 ms, and in the case of the absolute gating determination signal A =' 011 '(step S209), the cutout start position is moved by 5 ms. And the audio | voice signal extraction part 11 cuts out the audio | voice signal for a predetermined cut-out area from the position determined in step S101, and produces | generates a gating block (step S102).

When the addition value is calculated by the audio signal analysis unit 10, the gating loudness value calculation unit 21 calculates the gating loudness value L _t using the addition value (step S103). Absolute gating determination unit 22, gating loudness value L _t calculated in step S103 it is determined whether more than a first threshold (an absolute threshold -70LKFS) (step S104).

When the gating loudness value L _t exceeds the absolute threshold, the 3-bit absolute gating determination signal A = “100” is set (step S202), and the gating loudness value L _t is equal to or less than the first threshold (absolute threshold). In this case, it is determined whether or not it is equal to or less than the second threshold (−100LKFS) (step S203). Gating loudness value L _t is the case is less than the second threshold absolute gating decision signal A = a '000' (step S204). If the gating loudness value L _t exceeds the second threshold value equal to or smaller than a third threshold value (-90LKFS) (step S205). When the gating loudness value L _t is equal to or smaller than the third threshold, the absolute gating determination signal A is set to “001” (step S206). If the gating loudness value L _t exceeds the third threshold value equal to or smaller than a fourth threshold value (-80LKFS) (step S207). When the gating loudness value L _t is equal to or smaller than the fourth threshold, the absolute gating determination signal A is set to “010” (step S208). Gating loudness value L _t is the case more than the fourth threshold value and the absolute gating decision signal A = '011' (step S209).

The following is the same as the first embodiment calculates, in step S104, if the gating loudness value L _t is determined to exceed the absolute threshold, the absolute loudness value calculating unit 30, the audio signal analyzer 10 The added value is stored in the time-series data storage unit 50 (step S107). Then, the absolute loudness value calculation unit 30 calculates an absolute loudness value from the average value of the addition values stored in the time series data storage unit 50 (step S108). The final loudness value calculation unit 40 uses the relative value obtained from the absolute loudness value calculated in step S108 as a relative threshold value, and finally performs a relative gating process on the addition value stored in the time-series data storage unit 50. The average loudness value is calculated (step S109).

  FIG. 8 is a diagram illustrating a movement example of the gating block of the volume monitoring device 1 according to the second embodiment. As shown in FIG. 8, the sound volume monitoring apparatus 1 according to the second embodiment gradually changes the amount of movement of the cutout start position from the slide width c1 as the gating loudness value approaches the first threshold value (absolute threshold value). Shorten to c4. When the gating loudness value exceeds the first threshold (absolute threshold), the movement amount of the cutout start position is set as the slide width a. Also, if you can ignore the influence of silent sections in the program, such as when measuring the same audio signal many times, only the analysis start time is searched with high accuracy, and then the cut start position until the measurement ends. May be moved with a constant slide width a.

  As described above, in the volume monitoring device 1 according to the second embodiment, when the absolute gating determination unit 22 determines that the volume level is equal to or less than the absolute threshold, the amount of movement of the cutout start position increases as the volume level increases. When the volume level is determined to exceed the absolute threshold, the amount of movement of the cutout start position is made constant. For this reason, it is possible to search the head position of the sounded section at high speed and with high accuracy, and further reduce the number of gating blocks as compared with the volume monitoring device 1 according to the first embodiment, thereby reducing the calculation load. Can be reduced.

  Further, in the program production operation regulations, the target value is -24LKFS, and the relative threshold value is assumed to be near -34LKFS. Therefore, the threshold value for checking the optimum analysis start time may be -34LKFS. . In this case as well, since the probability of exceeding the threshold value varies depending on the sound level, the calculation load can be reduced by changing the slide width depending on the gating loudness value.

  It should be noted that a computer can be suitably used to function as the volume monitoring apparatus 1 of the first and second embodiments described above, and such a computer has processing contents for realizing each function of the volume monitoring apparatus 1. This can be realized by storing the described program in the storage unit of the computer, and reading and executing the program by the CPU of the computer. This program can be recorded on a computer-readable recording medium.

  Although the above embodiment has been described as a representative example, it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims. For example, a plurality of constituent blocks described in the embodiments can be combined into one, or one constituent block can be divided.

  In this embodiment, it is assumed that the measurement start time and the measurement end time are manually input. However, an audio signal from a sound reproduction device or a transmission device is received, and the measurement start time and the measurement end time are automatically set. It may be set. In addition, the average loudness value of the entire program is calculated at the end of the program. However, the average loudness value may be calculated during a silent period where the gating loudness value is below the absolute threshold, or may be calculated periodically such as every 10 seconds. Good.

  The volume monitoring device according to the present invention is useful in measuring the average loudness value at the time of program production or program exchange.

DESCRIPTION OF SYMBOLS 1 Sound volume monitoring apparatus 2 Display apparatus 10 Audio | voice signal analysis part 11 Audio | voice signal extraction part 12 Filter processing part 13 Root mean square processing part 14 Weight coefficient processing part 15 Addition processing part 20 Slide width determination part 21 Gating loudness value calculation part 22 Absolute Gating determination unit 30 Absolute loudness value calculation unit 40 Final loudness value calculation unit 50 Time series data storage unit 60 Average loudness value calculation unit

Claims (6)

A volume monitoring device that measures the volume of an input audio signal,
An audio signal cutout unit that cuts out an input audio signal in a predetermined cutout section while moving the cutout start position, and generates a plurality of gating blocks;
An absolute gating determination unit that determines whether or not a volume level of the gating block exceeds an absolute threshold;
An average loudness value calculating unit that calculates an average loudness value using a gating block determined by the absolute gating determination unit that the volume level exceeds the absolute threshold; and
The volume monitoring device, wherein the audio signal cutout unit sets a movement amount of the cutout start position to a different value according to a determination result by the absolute gating determination unit. The average loudness value calculator is
An absolute loudness value calculating unit that calculates an absolute loudness value that is a loudness value of a gating block that has been determined that the volume level exceeds the absolute threshold;
The final loudness value is calculated in the interval from the measurement start time to the measurement end time or in the entire audio signal using a gating block that is determined to exceed the relative threshold value relatively obtained from the absolute loudness value. A loudness value calculator;
The sound volume monitoring apparatus according to claim 1, comprising:   When the volume level is determined to be equal to or less than the absolute threshold by the absolute gating determination unit, the audio signal extraction unit is configured to set a movement amount of the extraction start position to a second slide width that is a predetermined slide width. The first slide width is shorter than the first slide width, and when it is determined that the volume level exceeds the absolute threshold, the movement amount of the cutout start position is set as the second slide width. Item 3. The volume monitoring device according to item 1 or 2.   The audio signal cutout unit sets the movement amount of the cutout start position to a second slide having a predetermined slide width until the absolute gating determination unit determines that the volume level exceeds the absolute threshold. The first slide width is shorter than the width, and after it is determined that the volume level exceeds the absolute threshold, the movement amount of the cutout start position is set as the second slide width until the measurement is completed. The volume monitoring apparatus according to claim 1, wherein the volume monitoring apparatus is characterized.   When the volume level is determined to be less than or equal to the absolute threshold by the absolute gating determination unit, the audio signal cutout unit changes so that the amount of movement of the cutout start position decreases as the volume level increases. The volume monitoring device according to claim 1, wherein when the volume level is determined to exceed the absolute threshold, the movement amount of the cutout start position is made constant.   The program for functioning a computer as a volume monitoring apparatus as described in any one of Claim 1 to 5.

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