JP2007005853A - Voice decoder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to automatically control output of voice data depending on the situation of surroundings. <P>SOLUTION: If judging that it is at night based on time information acquired by a time information section 103, for example, a gain control unit 101 lowers the gain of voice data, and then, the data are output to a voice output 104. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to an audio decoding device that decodes audio stream data.

  FIG. 23 is a block diagram showing a configuration of a conventional speech decoding apparatus. As shown in FIG. 23, the audio stream 105 is decoded by the audio decoding unit 100, and the decoded data is input to the audio output unit 104 so that audio data is output.

  At this time, the gain, DRC, frequency characteristics, reproduction speed, and the like of the audio data output from the audio output unit 104 are always constant regardless of time, audio stream genre, and the like.

In Patent Document 1, in consideration of the volume level of ambient noise, the gain of the stream itself, the frequency characteristics (equalizing characteristics), or the dynamic range characteristics, the output sound gain, frequency characteristics (equalizing characteristics), or dynamic range A technique for setting an optimum set value is disclosed.
JP-A-11-232787

  Here, in order to keep the voice data easy to hear while considering that the viewer does not make noise to surrounding people, the viewer uses the voice data from the voice output unit 104 at night when the ambient noise level is low. In the daytime when the gain (volume) is decreased and the noise level is increased, it is considered that the gain is increased for viewing.

  Further, the voice data is set so that the DRC becomes high at night due to consideration of surrounding people (that is, the difference between the maximum voice level and the minimum voice level becomes small), and is easy to hear in the daytime. In order to maintain the above, the DRC may be set to be low (so that the level difference becomes large) and then the appreciation may be performed.

  In addition, the low-frequency region component that is easily transmitted as noise to the surroundings is cut off at night (that is, through a high-pass filter for voice), and the audio data is watched without performing such a cut at night. Also good.

  On the other hand, looking at audio streams by genre, there are various genres such as rock music with a high volume and natural sounds for relaxation with a low volume. When appreciating such audio data, if the viewer decreases the gain in consideration of the surroundings for audio data of a high volume genre, and increases the gain to maintain ease of listening for audio data of a low volume genre, Conceivable.

  Further, when the audio data is a genre with a high volume, the DRC may be set high, and when the audio data is a genre with a low volume, the DRC may be set low before appreciation.

  Further, the audio data may be viewed without cutting the low frequency region component if the genre has a high volume, and may be viewed without performing such a cut if the genre has a low volume.

  In addition, for example, in the case of an audio stream stored in a data storage type medium (CD, DVD, etc.), it may be possible to maintain ease of listening if the playback speed is slow or fast.

  For example, consider the case of viewing audio data in a car. If the car window is open, the audio data gain should be lowered so that it will not be heard by people around you. Is preferred.

  Further, when the above-described conditions are set in reverse according to the viewer's preference (for example, the gain is increased at night), the limit value is set so that the characteristics of the audio data are within a predetermined range. This may be appropriate depending on the convenience and preference of the user.

  However, in the conventional speech decoding apparatus, the viewer has to perform these controls manually, which is very laborious and troublesome.

  The present invention has been made in view of this point, and an object of the present invention is to automatically control the output of audio data in accordance with the surrounding situation.

That is, the audio decoding device of the present invention includes an audio decoding unit that decodes an audio stream,
A gain adjustment unit that performs gain adjustment of audio data output from the audio decoding unit;
An audio output unit that outputs audio data that has been gain-adjusted by the gain adjustment unit;
A time information section for acquiring time information;
And a gain control unit that controls the gain adjustment unit based on the time information.

  As described above, according to the present invention, the gain, DRC, and the like of audio data output from the audio output unit can be automatically adjusted to appropriate values based on time, illuminance information, and the like. This eliminates the need for manual adjustment and is preferable.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or its application.

<Embodiment 1>
FIG. 1 is a block diagram showing a configuration of a speech decoding apparatus 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, the audio decoding device 1 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and time information. A time information unit 103 for acquiring sound and an audio output unit 104 (for example, a speaker) for outputting audio data.

  When the encoded audio stream 105 is input to the audio decoding apparatus 1, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into the gain adjustment unit 101. Is input. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received time information. Specifically, it is determined that the gain of the audio data should be lowered when the time information is nighttime (20:00 to 7:00), and when the time information is daytime (7:00:00 to 20:00) It is determined that the gain of the data should be increased, and a gain value corresponding to each case is calculated. The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

  As described above, according to the speech decoding apparatus according to the first embodiment, when listening to the speech data output from the speech output unit 104, the viewer can hear the surroundings at night when the ambient noise level is low. As a consideration for humans, the gain (volume) of the audio data is lowered to enable listening, and conversely, in the daytime when the noise level increases, the gain can be increased to ensure easy listening. Will increase.

  In the first embodiment, the configuration in which the audio stream 105 and the audio decoding unit 100 are combined has been described. However, the configuration is not limited to this configuration, and some audio data is output instead of the combination. May be. This also applies to the following embodiments.

<Embodiment 2>
FIG. 2 is a block diagram showing a configuration of the speech decoding apparatus 2 according to Embodiment 2 of the present invention. As shown in FIG. 2, the audio decoding apparatus 2 includes an audio decoding unit 100 that decodes an audio stream, a DRC adjustment unit 201 that adjusts dynamic range compression (DRC) of audio data, and a DRC control that controls the DRC adjustment unit 201. Unit 202, a time information unit 103 for acquiring time information, and an audio output unit 104 for outputting audio data.

  When the encoded audio stream 105 is input to the audio decoding device 2, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and this audio data is converted into the DRC adjustment unit 201. Is input. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the DRC control unit 202.

  The DRC control unit 202 calculates a DRC corresponding to the received time information. Specifically, when the time information is nighttime (20:00 to 7:00), the DRC of the audio data should be set high (that is, the difference between the maximum audio level and the minimum audio level is reduced). In the daytime (7: 00 to 20:00), it is determined that the DRC of the audio data should be set low (so that the level difference becomes large). A DRC value is calculated. Then, the calculated DRC value is transmitted to the DRC adjustment unit 201.

  The DRC adjustment unit 201 adjusts the DRC value of the audio data output from the audio decoding unit 100 based on the DRC value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 3>
FIG. 3 is a block diagram showing a configuration of the speech decoding apparatus 3 according to Embodiment 3 of the present invention. As illustrated in FIG. 3, the audio decoding device 3 controls an audio decoding unit 100 that decodes an audio stream, a frequency adjustment unit 301 that adjusts a gain of a specific frequency domain component of audio data, and a frequency adjustment unit 301. A frequency control unit 302, a time information unit 103 that acquires time information, and an audio output unit 104 that outputs audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 3, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into the frequency adjustment unit 301. Is input. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the frequency control unit 302.

  The frequency control unit 302 calculates the gain value of the low frequency region component according to the received time information. Specifically, when the time information is nighttime (20:00 to 7:00), it is determined that the low frequency region component of the audio data should be cut, and the daytime (7:00 to 20:00) In such a case, it is determined that such a cut should not be performed, and the gain value of the low frequency region component corresponding to each case is calculated. Then, the calculated gain value of the low frequency region component is transmitted to the frequency adjustment unit 301.

  The frequency adjusting unit 301 adjusts the gain value of the low frequency domain component of the audio data output from the audio decoding unit 100 based on the gain value of the low frequency domain component, and the adjusted audio data Is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 4>
FIG. 4 is a block diagram showing a configuration of the speech decoding apparatus 4 according to Embodiment 4 of the present invention. As shown in FIG. 4, the audio decoding device 4 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and illuminance information. Is provided with an illuminance information unit 403 that obtains sound and an audio output unit 104 that outputs audio data.

  When the encoded audio stream 105 is input to the audio decoding device 4, first, the audio decoding unit 100 decodes the audio stream 105 to generate audio data, and the audio data is converted into the gain adjustment unit 101. Is input. At this time, information indicating that the audio data has been generated is notified to the illuminance information unit 403.

  The illuminance information unit 403 acquires illuminance information at the time of the notification, and transmits the illuminance information to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received illuminance information. Specifically, when the illuminance information indicates illuminance corresponding to nighttime (20:00 to 7:00), it is determined that the gain of the audio data should be reduced, and daytime (7:00 to 20: 00), it is determined that the gain of the audio data should be increased, and a gain value corresponding to each case is calculated. The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

  As described above, according to the speech decoding apparatus according to the fourth embodiment, when listening to the speech data output from the speech output unit 104, it is determined whether the current time is daytime or nighttime based on illuminance information. At night, when the ambient noise level is low, the viewer can listen to the sound data with a lower gain (volume) as a consideration to the surrounding people, and conversely, it is easy to hear in the daytime when the noise level increases. To increase the gain, it becomes possible to listen with increased gain, which is very convenient.

<Embodiment 5>
FIG. 5 is a block diagram showing a configuration of speech decoding apparatus 5 according to Embodiment 5 of the present invention. As shown in FIG. 5, the audio decoding device 5 includes an audio decoding unit 100 that decodes an audio stream, a DRC adjustment unit 201 that adjusts dynamic range compression (DRC) of audio data, and a DRC control that controls the DRC adjustment unit 201. Unit 202, an illuminance information unit 403 that acquires illuminance information, and an audio output unit 104 that outputs audio data.

  When the encoded audio stream 105 is input to the audio decoding device 5, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is converted into the DRC adjustment unit 201. Is input. At this time, information indicating that the audio data has been generated is notified to the illuminance information unit 403.

  The illuminance information unit 403 acquires illuminance information at the time of the notification, and transmits the illuminance information to the DRC control unit 202.

  The DRC control unit 202 calculates DRC corresponding to the received illuminance information. Specifically, when the illuminance information indicates illuminance corresponding to nighttime (20:00 to 7:00), the DRC of the audio data is increased (that is, the difference between the maximum audio level and the minimum audio level is reduced). If the illuminance corresponding to daytime (7:00 to 20:00) is indicated, the DRC of the audio data is set low (so that the level difference becomes large). The DRC value corresponding to each case is calculated. Then, the calculated DRC value is transmitted to the DRC adjustment unit 201.

  The DRC adjustment unit 201 adjusts the DRC value of the audio data output from the audio decoding unit 100 based on the DRC value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 6>
FIG. 6 is a block diagram showing the configuration of the speech decoding apparatus 6 according to Embodiment 6 of the present invention. As illustrated in FIG. 6, the audio decoding device 6 controls an audio decoding unit 100 that decodes an audio stream, a frequency adjustment unit 301 that adjusts a gain of a specific frequency domain component of audio data, and a frequency adjustment unit 301. A frequency control unit 302, an illuminance information unit 403 that acquires illuminance information, and an audio output unit 104 that outputs audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding apparatus 6, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into a frequency adjustment unit 301. Is input. At this time, information indicating that the audio data has been generated is notified to the illuminance information unit 403.

  The illuminance information unit 403 acquires illuminance information indicating the illuminance at the time of the notification, and the illuminance information is transmitted to the frequency control unit 302.

  The frequency control unit 302 calculates the gain value of the low frequency region component according to the received illuminance information. Specifically, when the illuminance information indicates the illuminance corresponding to nighttime (20:00 to 7:00), it is determined that the low frequency region component of the audio data should be cut, and daytime (7: In the case of illuminance corresponding to (00 to 20:00), it is determined that such a cut should not be performed, and a gain value of a low frequency region component corresponding to each case is calculated. Then, the calculated gain value of the low frequency region component is transmitted to the frequency adjustment unit 301.

  The frequency adjusting unit 301 adjusts the gain value of the low frequency domain component of the audio data output from the audio decoding unit 100 based on the gain value of the low frequency domain component, and the adjusted audio data Is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 7>
FIG. 7 is a block diagram showing a configuration of speech decoding apparatus 7 according to Embodiment 7 of the present invention. As shown in FIG. 7, the audio decoding device 7 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and temperature information. Temperature information unit 703 for acquiring sound data, and an audio output unit 104 for outputting audio data.

  When the encoded audio stream 105 is input to the audio decoding device 7, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into the gain adjustment unit 101. Is input. At this time, the air temperature information unit 703 is notified of information indicating that voice data has been generated.

  In the temperature information unit 703, temperature information at the time of the notification is acquired, and the temperature information is transmitted to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received temperature information. Specifically, when the temperature information indicates the temperature corresponding to the nighttime (20:00 to 7:00), it is determined that the gain of the audio data should be lowered, and the daytime (7: 0 to 20: 00), it is determined that the gain of the audio data should be increased, and a gain value corresponding to each case is calculated. The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Eighth embodiment>
FIG. 8 is a block diagram showing a configuration of speech decoding apparatus 8 according to Embodiment 8 of the present invention. As shown in FIG. 8, the audio decoding device 8 includes an audio decoding unit 100 that decodes an audio stream, a DRC adjustment unit 201 that adjusts dynamic range compression (DRC) of audio data, and a DRC control that controls the DRC adjustment unit 201. Unit 202, temperature information unit 703 for acquiring temperature information, and audio output unit 104 for outputting audio data.

  When the encoded audio stream 105 is input to the audio decoding device 8, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is converted into the DRC adjustment unit 201. Is input. At this time, the air temperature information unit 703 is notified of information indicating that voice data has been generated.

  In the temperature information unit 703, temperature information at the time of the notification is acquired, and the temperature information is transmitted to the DRC control unit 202.

  The DRC control unit 202 calculates a DRC corresponding to the received temperature information. Specifically, when the temperature information indicates the temperature corresponding to nighttime (20:00 to 7:00), the DRC of the audio data is increased (that is, the difference between the maximum audio level and the minimum audio level is reduced). If the temperature corresponding to the daytime (7: 00 to 20:00) is indicated, the DRC of the audio data is set low (so that the level difference becomes large). The DRC value corresponding to each case is calculated. Then, the calculated DRC value is transmitted to the DRC adjustment unit 201.

  The DRC adjustment unit 201 adjusts the DRC value of the audio data output from the audio decoding unit 100 based on the DRC value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Ninth Embodiment>
FIG. 9 is a block diagram showing the configuration of the speech decoding apparatus 9 according to Embodiment 9 of the present invention. As shown in FIG. 9, the audio decoding device 9 controls an audio decoding unit 100 that decodes an audio stream, a frequency adjustment unit 301 that adjusts a gain of a specific frequency domain component of audio data, and a frequency adjustment unit 301. A frequency control unit 302, an air temperature information unit 703 that acquires air temperature information, and an audio output unit 104 that outputs audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 9, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into the frequency adjustment unit 301. Is input. At this time, the air temperature information unit 703 is notified of information indicating that voice data has been generated.

  In the temperature information unit 703, temperature information indicating the temperature at the time of the notification is acquired, and the temperature information is transmitted to the frequency control unit 302.

  The frequency control unit 302 calculates the gain value of the low frequency region component according to the received temperature information. Specifically, when the temperature information indicates the temperature corresponding to the nighttime (20:00 to 7:00), it is determined that the low frequency region component of the audio data should be cut, and the daytime (7: In the case where the air temperature corresponding to (00 to 20:00) is indicated, it is determined that such a cut should not be performed, and the gain value of the low frequency region component corresponding to each case is calculated. Then, the calculated gain value of the low frequency region component is transmitted to the frequency adjustment unit 301.

  The frequency adjusting unit 301 adjusts the gain value of the low frequency domain component of the audio data output from the audio decoding unit 100 based on the gain value of the low frequency domain component, and the adjusted audio data Is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 10>
FIG. 10 is a block diagram showing a configuration of speech decoding apparatus 10 according to Embodiment 10 of the present invention. As shown in FIG. 10, the audio decoding device 10 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and genre information. The genre information unit 1003 for acquiring the audio data and the audio output unit 104 for outputting the audio data.

  When the encoded audio stream 105 is input to the audio decoding apparatus 10, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into the gain adjustment unit 101. Is input. At this time, information indicating that the audio data is generated is notified to the genre information unit 1003.

  In the genre information unit 1003, genre information of the audio stream 105 is acquired, and the genre information is transmitted to the gain control unit 102.

  Note that the genre information of the audio stream 105 is classified into n types (n = 1, 2, 3,...), And the genre information unit 1003 and the gain control unit 102 can identify the genre information. .

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received genre information. Specifically, when the genre information is a genre with a large volume such as rock music, for example, it is determined that the gain of the audio data should be lowered. It is determined that the gain of the audio data should be increased, and a gain value corresponding to each case is calculated. The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 11>
FIG. 11 is a block diagram showing the configuration of the speech decoding apparatus 11 according to Embodiment 11 of the present invention. As shown in FIG. 11, the audio decoding device 11 includes an audio decoding unit 100 that decodes an audio stream, a DRC adjustment unit 201 that adjusts dynamic range compression (DRC) of audio data, and a DRC control that controls the DRC adjustment unit 201. A unit 202, a genre information unit 1003 for acquiring genre information, and an audio output unit 104 for outputting audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 11, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is converted into the DRC adjustment unit 201. Is input. At this time, information indicating that the audio data is generated is notified to the genre information unit 1003.

  In the genre information unit 1003, genre information of the audio stream 105 is acquired, and the genre information is transmitted to the DRC control unit 202.

  Note that the genre information of the audio stream 105 is classified into n types (n = 1, 2, 3,...), And the genre information unit 1003 and the DRC control unit 202 can identify the genre information. .

  The DRC control unit 202 calculates a DRC corresponding to the received genre information. Specifically, when the genre information is a genre with a large volume such as rock music, the DRC of the audio data should be set high (that is, the difference between the maximum audio level and the minimum audio level is reduced). For example, in the case of a genre with a low volume such as a natural sound, it is determined that the DRC of the audio data should be set low (so that the level difference becomes large). The DRC value is calculated. Then, the calculated DRC value is transmitted to the DRC adjustment unit 201.

  The DRC adjustment unit 201 adjusts the DRC value of the audio data output from the audio decoding unit 100 based on the DRC value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Twelfth embodiment>
FIG. 12 is a block diagram showing a configuration of speech decoding apparatus 12 according to Embodiment 12 of the present invention. As shown in FIG. 12, the audio decoding device 12 controls an audio decoding unit 100 that decodes an audio stream, a frequency adjustment unit 301 that adjusts the gain of a specific frequency domain component of audio data, and a frequency adjustment unit 301. A frequency control unit 302, a genre information unit 1003 that acquires genre information, and an audio output unit 104 that outputs audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 12, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is converted into a frequency adjusting unit 301. Is input. At this time, information indicating that the audio data is generated is notified to the genre information unit 1003.

  In the genre information unit 1003, genre information of the audio stream 105 is acquired, and the genre information is transmitted to the frequency control unit 302.

  The genre information of the audio stream 105 is classified into n types (n = 1, 2, 3,...), And the genre information unit 1003 and the frequency control unit 302 can identify the genre information. .

  The frequency control unit 302 calculates the gain value of the low frequency region component according to the received genre information. Specifically, when the genre information is a genre with a large volume such as rock music, it is determined that the low frequency region component of the audio data should be cut. In some cases, it is determined that such a cut should not be performed, and the gain value of the low frequency region component corresponding to each case is calculated. Then, the calculated gain value of the low frequency region component is transmitted to the frequency adjustment unit 301.

  The frequency adjusting unit 301 adjusts the gain value of the low frequency domain component of the audio data output from the audio decoding unit 100 based on the gain value of the low frequency domain component, and the adjusted audio data Is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 13>
FIG. 13 is a block diagram showing the configuration of the speech decoding apparatus 13 according to Embodiment 13 of the present invention. As illustrated in FIG. 13, the audio decoding device 13 includes an audio decoding unit 100 that decodes an audio stream, a speed adjustment unit 1301 that changes a reproduction speed of audio data, a speed control unit 1302 that controls the speed adjustment unit 1301, and a genre. A genre information unit 1003 for acquiring information and an audio output unit 104 for outputting audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 13, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is converted into a speed adjustment unit 1301. Is input. At this time, information indicating that the audio data is generated is notified to the genre information unit 1003.

  In the genre information unit 1003, genre information of the audio stream 105 is acquired, and the genre information is transmitted to the speed control unit 1302.

  Note that the genre information of the audio stream 105 is classified into n types (n = 1, 2, 3,...), And the genre information unit 1003 and the speed control unit 1302 can identify the genre information. .

  The speed controller 1302 calculates the playback speed of the audio data according to the received genre information. Specifically, when the genre information is a genre whose playback speed may be changed, such as news or variety, it is determined that the playback speed of audio data should be increased. In the case of a genre that should not change the speed, it is determined that the playback speed should not be increased, and the playback speed corresponding to each case is calculated. Then, a value indicating the calculated reproduction speed is transmitted to the speed adjustment unit 1301.

  The speed adjustment unit 1301 adjusts the reproduction speed of the audio data output from the audio decoding unit 100 based on the value indicating the reproduction speed, and outputs the adjusted audio data to the audio output unit 104. Is done.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

  As described above, according to the audio decoding device according to the thirteenth embodiment, when listening to the audio data output from the audio output unit 104, the playback speed can be changed according to the genre of the audio stream. That is, if the genre of the audio stream is to be listened to while saving time such as news or variety, the listening speed should be increased and the playback speed of sports or music should not change. In some cases, such as listening without increasing the playback speed, the playback speed can be set automatically, which is very convenient.

<Embodiment 14>
FIG. 14 is a block diagram showing a configuration of the speech decoding apparatus 14 according to Embodiment 14 of the present invention. As illustrated in FIG. 14, the audio decoding device 14 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and a viewer An operation information unit 1403 for acquiring operation information indicating the ON / OFF state of the indoor lamp in the room where the room is located, and an audio output unit 104 for outputting audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 14, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is converted into the gain adjustment unit 101. Is input. At this time, information indicating that voice data has been generated is notified to the operation information unit 1403.

  In the operation information unit 1403, operation information indicating the ON / OFF state of the indoor lamp at the time when the notification is made is acquired, and the operation information is transmitted to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received operation information. Specifically, when the operation information indicates that the room light is in an ON state, that is, at night (20: 00 to 7:00), it is determined that the gain of the audio data should be lowered, and the room light is Is in the OFF state, that is, when it indicates daytime (7:00 to 20:00), it is determined that the gain of the audio data should be increased, and a gain value corresponding to each case is calculated. . The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 15>
FIG. 15 is a block diagram showing a configuration of the speech decoding apparatus 15 according to Embodiment 15 of the present invention. As shown in FIG. 15, the audio decoding device 15 includes an audio decoding unit 100 that decodes an audio stream, a DRC adjustment unit 201 that adjusts dynamic range compression (DRC) of audio data, and a DRC control that controls the DRC adjustment unit 201. Unit 202, an operation information unit 1403 for acquiring operation information indicating the ON / OFF state of the indoor lamp in the room where the viewer is present, and an audio output unit 104 for outputting audio data.

  When the encoded audio stream 105 is input to the audio decoding device 15, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is converted into the DRC adjustment unit 201. Is input. At this time, information indicating that the voice data has been generated is notified to the operation information unit 1403.

  In the operation information unit 1403, operation information indicating the ON / OFF state of the indoor lamp at the time of the notification is acquired, and the time information is transmitted to the DRC control unit 202.

  The DRC control unit 202 calculates a DRC corresponding to the received operation information. Specifically, when the operation information indicates that the indoor light is in an ON state, that is, at night (20:00 to 7:00), the DRC of the audio data is increased (that is, the maximum audio level and the minimum audio). If it is determined that the setting should be set (so that the level difference is small) and the room light is in the OFF state, that is, it indicates the daytime (7:00 to 20:00), the DRC of the audio data is set. It is determined that it should be set low (so that the level difference becomes large), and a DRC value corresponding to each case is calculated. Then, the calculated DRC value is transmitted to the DRC adjustment unit 201.

  The DRC adjustment unit 201 adjusts the DRC value of the audio data output from the audio decoding unit 100 based on the DRC value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 16>
FIG. 16 is a block diagram showing a configuration of speech decoding apparatus 16 according to Embodiment 16 of the present invention. As shown in FIG. 16, the audio decoding device 16 controls an audio decoding unit 100 that decodes an audio stream, a frequency adjustment unit 301 that adjusts the gain of a specific frequency domain component of audio data, and a frequency adjustment unit 301. A frequency control unit 302, an operation information unit 1403 that acquires operation information indicating the ON / OFF state of the indoor lamp in the room where the viewer is present, and an audio output unit 104 that outputs audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 16, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into the frequency adjustment unit 301. Is input. At this time, information indicating that voice data has been generated is notified to the operation information unit 1403.

  In the operation information unit 1403, operation information indicating the ON / OFF state of the indoor lamp at the time when the notification is made is acquired, and the time information is transmitted to the frequency control unit 302.

  The frequency control unit 302 calculates the gain value of the low frequency region component according to the received operation information. Specifically, when the operation information indicates that the indoor light is in an ON state, that is, at night (20: 00 to 7:00), it is determined that the low frequency region component of the audio data should be cut. When it is indicated that the interior light is in an OFF state, that is, in the daytime (7: 00 to 20:00), it is determined that such a cut should not be performed, and a low frequency region corresponding to each case A component gain value is calculated. Then, the calculated gain value of the low frequency region component is transmitted to the frequency adjustment unit 301.

  The frequency adjusting unit 301 adjusts the gain value of the low frequency domain component of the audio data output from the audio decoding unit 100 based on the gain value of the low frequency domain component, and the adjusted audio data Is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 17>
FIG. 17 is a block diagram showing the configuration of the speech decoding apparatus 17 according to Embodiment 17 of the present invention. As shown in FIG. 17, the audio decoding device 17 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, a vehicle window An open / close information unit 1703 for acquiring open / close information indicating an open / close state and an audio output unit 104 for outputting audio data are provided.

  When the encoded audio stream 105 is input to the audio decoding device 17, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data, and the audio data is converted into the gain adjustment unit 101. Is input. At this time, information indicating that the audio data has been generated is notified to the opening / closing information unit 1703.

  The opening / closing information unit 1703 acquires opening / closing information indicating the opening / closing state of the vehicle window at the time of the notification, and the opening / closing information is transmitted to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received opening / closing information. Specifically, it is determined that the gain of the audio data should be reduced when the opening / closing information indicates the open state of the vehicle window, and the gain of the audio data should be increased when the open / close information indicates the closed state of the vehicle window. And a gain value corresponding to each case is calculated. The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

  As described above, according to the audio decoding device according to the seventeenth embodiment, when listening to the audio data output from the audio output unit 104, the viewer is in the surroundings when the car window is open. As a consideration for people, listening to audio data with a lower gain (volume), and conversely, when the car window is closed, you can increase the gain to make it easier to hear. Increases nature.

<Embodiment 18>
FIG. 18 is a block diagram showing the configuration of the speech decoding apparatus 18 according to Embodiment 18 of the present invention. As illustrated in FIG. 18, the audio decoding device 18 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and time information. A time information unit 103 for acquiring audio data, an audio output unit 104 for outputting audio data, and a setting unit 1805 that allows the user to arbitrarily set the gain value of the audio data and the corresponding time zone.

  First, in the setting unit 1805, a user's operation is set in advance to increase the gain of the audio data at night (20: 00 to 7:00) and to decrease the gain during the day (7:00 to 20:00). deep.

  When the encoded audio stream 105 is input to the audio decoding device 18, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is gain adjusted. Input to the unit 101. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data according to the received time information and the setting information set by the setting unit 1805. Specifically, when the time information is nighttime (20:00 to 7:00), it is determined that the gain of the voice data should be increased, and when the time information is daytime (7:00:00 to 20:00), the voice data It is determined that the data gain should be lowered, and a gain value corresponding to each case is calculated. Then, the calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

  As described above, according to the audio decoding device according to the eighteenth embodiment, when listening to the audio data output from the audio output unit 104, the viewer increases the gain of the audio data according to his / her convenience and preference. It can be adjusted and is very convenient.

<Embodiment 19>
FIG. 19 is a block diagram showing the configuration of the speech decoding apparatus 19 according to Embodiment 19 of the present invention. As shown in FIG. 19, the audio decoding device 19 includes an audio decoding unit 100 that decodes an audio stream, a DRC adjustment unit 201 that adjusts dynamic range compression (DRC) of audio data, and a DRC control that controls the DRC adjustment unit 201. Unit 202, time information unit 103 that acquires time information, audio output unit 104 that outputs audio data, and setting unit 1805 that allows the user to arbitrarily set the DRC value of audio data and the corresponding time zone.

  First, the setting unit 1805 sets in advance by the user operation so that the DRC of the audio data is lowered at night (20: 00 to 7:00) and the DRC is increased during the day (7:00 to 20:00). Keep it.

  When the encoded audio stream 105 is input to the audio decoding device 19, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and this audio data is subjected to DRC adjustment. Input to the unit 201. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the DRC control unit 202.

  The DRC control unit 202 calculates a DRC corresponding to the received time information and the setting information set by the setting unit 1805. Specifically, when the time information is nighttime (20:00 to 7:00), the DRC of the audio data should be set low (that is, the difference between the maximum audio level and the minimum audio level is increased). In the daytime (7:00 to 20:00), it is determined that the DRC of the audio data should be set high (so that the level difference becomes small), and according to each case A DRC value is calculated. Then, the calculated DRC value is transmitted to the DRC adjustment unit 201.

  The DRC adjustment unit 201 adjusts the DRC value of the audio data output from the audio decoding unit 100 based on the DRC value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 20>
FIG. 20 is a block diagram showing a configuration of speech decoding apparatus 20 according to Embodiment 20 of the present invention. As shown in FIG. 20, the audio decoding device 20 controls an audio decoding unit 100 that decodes an audio stream, a frequency adjustment unit 301 that adjusts the gain of a specific frequency domain component of audio data, and a frequency adjustment unit 301. Frequency control unit 302, time information unit 103 that acquires time information, audio output unit 104 that outputs audio data, and setting unit 1805 that allows the user to arbitrarily set the low frequency component cut amount of audio data and the corresponding time zone It has.

  First, in the setting unit 1805, the low frequency component of the audio data is not cut at night (20:00 to 7:00), and the low frequency component is cut at daytime (7:00 to 20:00). It is set in advance by user operation.

  When the encoded audio stream 105 is input to the audio decoding device 20, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is subjected to frequency adjustment. Input to the unit 301. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the frequency control unit 302.

  The frequency control unit 302 calculates the gain value of the low frequency region component according to the received time information and the setting information set by the setting unit 1805. Specifically, when the time information is nighttime (20:00 to 7:00), it is determined that the low frequency region component of the audio data should not be cut, and in the case of daytime (7:00 to 20:00) Is determined that the low frequency region component should be cut, and the gain value of the low frequency region component corresponding to each case is calculated. Then, the calculated gain value of the low frequency region component is transmitted to the frequency adjustment unit 301.

  The frequency adjusting unit 301 adjusts the gain value of the low frequency domain component of the audio data output from the audio decoding unit 100 based on the gain value of the low frequency domain component, and the adjusted audio data Is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

<Embodiment 21>
FIG. 21 is a block diagram showing the configuration of the speech decoding apparatus 21 according to Embodiment 21 of the present invention. As shown in FIG. 21, the audio decoding device 21 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and time information. Is provided with a time information unit 103 for acquiring sound, an audio output unit 104 for outputting audio data, and a limit value control unit 2106 that allows a user to arbitrarily set a limit value of the adjusted gain.

  First, the limit value control unit 2106 sets a limit value in advance by a user operation so that the adjusted gain value falls within a predetermined range.

  When the encoded audio stream 105 is input to the audio decoding device 21, the audio decoding unit 100 first decodes the audio stream 105 to generate audio data, and the audio data is gain adjusted. Input to the unit 101. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received time information. Specifically, it is determined that the gain of the audio data should be lowered when the time information is nighttime (20:00 to 7:00), and when the time information is daytime (7:00:00 to 20:00) It is determined that the gain of the data should be increased, and a gain value corresponding to each case is calculated. The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the limit value control unit 2106. .

  The limit value control unit 2106 determines whether or not the adjusted gain value exceeds a set limit value. Here, when the adjusted gain value is larger than the limit value, the adjusted gain value is readjusted in the direction of decreasing. In addition, when the adjusted gain value is smaller than the limit value, the adjusted gain value is readjusted so as to increase. The audio data readjusted in this way is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

  In addition, in the speech decoding apparatus 21 of the 21st embodiment, the configuration in which the limit value control unit 2106 is provided to the speech decoding apparatus 1 of the first embodiment that adjusts the gain has been described. However, the present invention is not limited to this configuration. For example, the limit value control unit 2106 may be provided for the speech decoding apparatus according to the second embodiment for adjusting DRC or the thirteenth embodiment for adjusting playback speed.

<Embodiment 22>
FIG. 22 is a block diagram showing a configuration of the speech decoding apparatus 22 according to Embodiment 22 of the present invention. As illustrated in FIG. 22, the audio decoding device 22 includes an audio decoding unit 100 that decodes an audio stream, a gain adjustment unit 101 that adjusts the gain of audio data, a gain control unit 102 that controls the gain adjustment unit 101, and time information. The time information unit 103 for acquiring the audio data, the audio output unit 104 for outputting audio data, and a switching unit 2207 that allows the user to arbitrarily switch whether or not to perform gain adjustment.

  First, in the switching unit 2207, whether or not to adjust the gain of audio data according to time information is set in advance by a user operation. That is, when the user thinks that the gain adjustment is not necessary, it can be controlled not to perform the gain adjustment.

  When the encoded audio stream 105 is input to the audio decoding device 1, first, the audio stream 105 is decoded by the audio decoding unit 100 to generate audio data.

  Here, when the user sets the gain adjustment not to be performed by the switching unit 2207, the decoded audio data is output to the audio output unit 104, and the audio output unit 104 outputs the audio that can be viewed by the user. Is output.

  On the other hand, when the switching unit 2207 is set to perform gain adjustment, the decoded audio data is input to the gain adjustment unit 101. At this time, information indicating that the audio data has been generated is notified to the time information unit 103.

  The time information unit 103 acquires time information indicating the time when the notification is made, and transmits the time information to the gain control unit 102.

  The gain control unit 102 calculates the gain value of the audio data corresponding to the received time information. Specifically, it is determined that the gain of the audio data should be lowered when the time information is nighttime (20:00 to 7:00), and when the time information is daytime (7:00:00 to 20:00) It is determined that the gain of the data should be increased, and a gain value corresponding to each case is calculated. The calculated gain value is transmitted to the gain adjustment unit 101.

  The gain adjustment unit 101 adjusts the gain value of the audio data output from the audio decoding unit 100 based on the gain value, and the adjusted audio data is output to the audio output unit 104.

  The audio output unit 104 outputs the input audio data as audio that can be viewed by the user.

  Note that, in the speech decoding device 22 of the present embodiment 22, whether or not to perform gain adjustment of the speech data according to time information is switched, but the present invention is not limited to this mode. As in the case of the audio decoding devices 2 to 21, the gain, DRC, and low frequency components of audio data according to time information, temperature information, illuminance information, audio stream genre information, home appliance operation information, and car window opening / closing information It may be switched whether to control the cut and reproduction speed.

  As described above, the present invention provides a highly practical effect of being able to automatically control the output of audio data in accordance with the surrounding situation, so that it is extremely useful and has industrial applicability. Is expensive. That is, it is possible to perform an output control operation according to the user's preference without taking time, and for example, it can be applied to consumer audio equipment such as a DVD player, a television, and a car audio.

It is a block diagram which shows the structure of the audio | voice decoding apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the audio | voice decoding apparatus which concerns on this Embodiment 2. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 3. It is a block diagram which shows the structure of the audio | voice decoding apparatus which concerns on this Embodiment 4. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 5. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 6. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 7. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 8. FIG. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 9. FIG. It is a block diagram which shows the structure of the speech decoder based on this Embodiment 10. FIG. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 11. FIG. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 12. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this 13th Embodiment. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 14. FIG. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 15. FIG. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 16. FIG. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 17. FIG. It is a block diagram which shows the structure of the speech decoding apparatus which concerns on this Embodiment 18. FIG. [Fig. 38] Fig. 38 is a block diagram illustrating a configuration of a speech decoding device according to the nineteenth embodiment. It is a block diagram which shows the structure of the speech decoder based on this Embodiment 20. FIG. It is a block diagram which shows the structure of the speech decoder based on this Embodiment 21. FIG. It is a block diagram which shows the structure of the speech decoder based on this Embodiment 22. It is a block diagram which shows the structure of the conventional audio | voice decoding apparatus.

Explanation of symbols

1-22 Audio decoding device 100 Audio decoding unit 101 Gain adjustment unit 102 Gain control unit 103 Time information unit 104 Audio output unit 105 Audio stream 201 DRC adjustment unit 202 DRC control unit 301 Frequency adjustment unit 302 Frequency control unit 403 Illuminance information unit 703 Temperature information section 1003 Genre information section 1301 Speed adjustment section 1302 Speed control section 1403 Operation information section 1703 Open / close information section 1805 Setting section 2106 Limit value control section 2207 Switching section

Claims (22)

An audio decoding unit for decoding the audio stream;
A gain adjustment unit that performs gain adjustment of audio data output from the audio decoding unit;
An audio output unit that outputs audio data that has been gain-adjusted by the gain adjustment unit;
A time information section for acquiring time information;
A speech decoding apparatus comprising: a gain control unit that controls an operation of the gain adjustment unit based on the time information. An audio decoding unit for decoding the audio stream;
A DRC adjustment unit that performs dynamic range compression (DRC) adjustment of audio data output from the audio decoding unit;
An audio output unit that outputs audio data that has been DRC adjusted by the DRC adjustment unit;
A time information section for acquiring time information;
A speech decoding apparatus comprising: a DRC control unit that controls the operation of the DRC adjustment unit based on the time information. An audio decoding unit for decoding the audio stream;
A frequency adjustment unit that performs a partial cut in the frequency domain of audio data output from the audio decoding unit;
An audio output unit that outputs audio data adjusted by the frequency adjustment unit;
A time information section for acquiring time information;
A speech decoding apparatus comprising: a frequency control unit that controls an operation of the frequency adjustment unit based on the time information. The speech decoding apparatus according to claim 1,
Instead of the time information part, an illuminance information part for obtaining illuminance information is provided,
The speech decoding apparatus, wherein the gain control unit is configured to control an operation of the gain adjustment unit based on the illuminance information. The speech decoding apparatus according to claim 2, wherein
Instead of the time information part, an illuminance information part for obtaining illuminance information is provided,
The DRC adjustment unit is configured to control an operation of the DRC adjustment unit based on the illuminance information. The speech decoding apparatus according to claim 3, wherein
Instead of the time information part, an illuminance information part for obtaining illuminance information is provided,
The speech decoding apparatus, wherein the frequency control unit is configured to control the operation of the frequency adjustment unit based on the illuminance information. The speech decoding apparatus according to claim 1,
Instead of the time information part, it comprises a temperature information part for obtaining temperature information,
The gain control unit is configured to control the operation of the gain adjustment unit based on the temperature information. The speech decoding apparatus according to claim 2, wherein
Instead of the time information part, it comprises a temperature information part for obtaining temperature information,
The DRC adjustment unit is configured to control an operation of the DRC adjustment unit based on the temperature information. The speech decoding apparatus according to claim 3, wherein
Instead of the time information part, it comprises a temperature information part for obtaining temperature information,
The speech decoding apparatus, wherein the frequency control unit is configured to control an operation of the frequency adjustment unit based on the temperature information. The speech decoding apparatus according to claim 1,
Instead of the time information part, a genre information part for acquiring genre information of the audio stream,
The speech decoding apparatus, wherein the gain control unit is configured to control an operation of the gain adjustment unit based on the genre information. The speech decoding apparatus according to claim 2, wherein
Instead of the time information part, a genre information part for acquiring genre information of the audio stream,
The DRC adjustment unit is configured to control an operation of the DRC adjustment unit based on the genre information. The speech decoding apparatus according to claim 3, wherein
Instead of the time information part, a genre information part for acquiring genre information of the audio stream,
The speech decoding apparatus, wherein the frequency control unit is configured to control an operation of the frequency adjustment unit based on the genre information. An audio decoding unit for decoding the audio stream;
A speed adjustment unit that adjusts the reproduction speed of audio data output from the audio decoding unit;
An audio output unit that outputs the audio data speed-adjusted by the speed adjustment unit;
A genre information section for acquiring genre information of the audio stream;
A speech decoding apparatus comprising: a speed control unit that controls an operation of the speed adjustment unit based on the genre information. The speech decoding apparatus according to claim 1,
In place of the time information part, an operation information part for obtaining operation information indicating the ON / OFF state of the room light is provided,
The speech decoding apparatus, wherein the gain control unit is configured to control an operation of the gain adjustment unit based on the operation information. The speech decoding apparatus according to claim 2, wherein
In place of the time information part, an operation information part for obtaining operation information indicating the ON / OFF state of the room light is provided,
The DRC adjustment unit is configured to control an operation of the DRC adjustment unit based on the operation information. The speech decoding apparatus according to claim 3, wherein
In place of the time information part, an operation information part for obtaining operation information indicating the ON / OFF state of the room light is provided,
The speech decoding apparatus, wherein the frequency control unit is configured to control an operation of the frequency adjustment unit based on the operation information. The speech decoding apparatus according to claim 1,
Instead of the time information part, comprising an opening / closing information part for obtaining opening / closing information indicating the opening / closing state of the window of the automobile on which the user is riding,
The speech decoding apparatus, wherein the gain control unit is configured to control an operation of the gain adjustment unit based on the opening / closing information. The speech decoding apparatus according to claim 1,
A speech decoding apparatus, further comprising: a setting unit configured to set setting information for operating the gain control unit according to a procedure input in advance by a user. The speech decoding apparatus according to claim 2, wherein
A speech decoding apparatus, further comprising: a setting unit configured to set setting information for operating the DRC control unit according to a procedure input in advance by a user. The speech decoding apparatus according to claim 3, wherein
A speech decoding apparatus, further comprising: a setting unit configured to set setting information for operating the frequency control unit according to a procedure input in advance by a user. The speech decoding apparatus according to claim 1,
A speech decoding apparatus, further comprising: a limit value control unit that sets a limit value of a gain value of the speech data that has been gain-adjusted by the gain adjustment unit. The speech decoding apparatus according to claim 1,
A switching unit that switches an output destination of the audio data output from the audio decoding unit;
The switching unit is configured to output the audio data to the gain adjustment unit when performing gain adjustment of the audio data, and to output to the audio output unit when performing gain adjustment. A speech decoding apparatus characterized by comprising:

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