Apparatus, method, computer program and bitstream for quality control and / or enhancement of audio scenes

Abstract

Embodiments according to the invention comprise apparatuses, methods, computer programs and bitstreams for quality control and / or enhancement of audio scenes. Embodiments according to the invention are related to apparatuses and methods for quality control and enhancement of audio scenes.

Description

Embodiments of the present invention include apparatus, methods, computer programs, and bitstreams for quality control and / or enhancement in audio scenarios. Embodiments of the present invention relate to apparatus and methods for quality control and enhancement in audio scenarios. Abstract

Claims

Claims1. An audio analyzer (100, 600, 800), wherein the audio analyzer is configured to obtain an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) comprising a speech portion and a background portion; wherein the audio analyzer is configured to determine a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content, and / or wherein the audio analyzer is configured to determine a short-term intensity information (112, 612, 1112) of a speech portion of the audio content, and wherein the audio analyzer is configured to provide a representation of the short-term intensity difference and / or a representation of the short-term intensity information of the speech portion as an analysis result (102), or wherein the audio analyzer is configured to derive an analysis result (102, 622) from the short-term intensity difference and / or from the short-term intensity information of the speech portion.

2. Audio analyzer (100, 600, 800) according to claim 1 , wherein the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) comprises a temporal resolution of no more than 3000ms, or comprises a temporal resolution of no more than 1000ms, or comprises a temporal resolution of no more than 400ms, or comprises a temporal resolution of no more than 100ms, or comprises a temporal resolution of no more than 40ms, or comprises a temporal resolution of no more than 20ms; or wherein the short-term intensity difference and / or the short-term intensity information comprises a temporal resolution between 3000ms and 400ms.

3. Audio analyzer (100, 600, 800) according to one of claims 1 or 2,wherein the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion comprises a temporal resolution of one audio frame, or wherein the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion comprises a temporal resolution of two audio frames, or wherein the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion comprises a temporal resolution of no more than 10 audio frames.

4. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the short-term intensity difference (112, 812) is a short-term loudness difference or a momentary loudness difference; and / or wherein the short-term intensity information (112, 612, 1112) of the speech portion is a short-term loudness or a momentary loudness.

5. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the short-term intensity difference (112, 812) is a short-term energy ratio or a momentary energy ratio; and / or wherein the short-term intensity information (112, 612, 1112) of the speech portion is a short-term energy or a momentary energy.

6. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) is a low level characteristic of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

7. Audio analyzer (100, 600, 800) according to any of the preceding claims,wherein the audio analyzer is configured to provide the analysis result (102, 622) independent from features of the speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) which go beyond an intensity feature.

8. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to provide the analysis result (102, 622) solely in dependence on one or more features of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) which can be modified by a scaling of one or more portions of the audio content.

9. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to separate an obtained audio content (101 , 601 , 631 , 1001 , 1201 , 1241) into a speech portion of the audio content and a background portion of the audio content.

10. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to determine or estimate an intensity of a speech portion of the obtained audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and an intensity of a background portion of the obtained audio content.11 . Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to provide a meta information of an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and / or encoded audio content as the analysis result (102, 622) .

12. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to provide the analysis result in a character- encoded form and / or in binary form.

13. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to provide a visualization (710, 720, 730) of the analysis result (102, 622) .

14. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to obtain the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion on the basis of a local power of one or more audio signals, or on the basis of a local power of a plurality of portions of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241); or wherein the audio analyzer is configured to obtain the short-term intensity difference and / or the short-term intensity information of the speech portion on the basis of a shortterm or momentary loudness as per ITLI-R BS.1770 and EBU R 128 or a variation of them.

15. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to obtain the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion on the basis of one or more filtered portions of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

16. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to obtain the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion using a computational model of loudness.

17. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to obtain the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion using one or more artificial-intelligence-based short-term intensity estimates.

18. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to combine a plurality of portions of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241), in order to obtain the short-term intensitydifference (112, 812) and / or in order to obtain the short-term intensity information (112, 612, 1112) of the speech portion, and / or wherein the audio analyzer is configured to combine a plurality of audio signals of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241), in order to obtain the short-term intensity difference (112, 812) and / or in order to obtain the short-term intensity information (112, 612, 1112) of the speech portion.

19. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to determine one or more critical passages (622) of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) based on the short-term intensity difference (112, 812) and / or based on the short-term intensity information (112, 612, 1112) of the speech portion; wherein a critical passage is a portion of the audio content in which an intensity of the speech portion is low in absolute terms and / or relatively to the background portion; and wherein the analysis result (102, 622) comprises an information about the one or more critical passages.

20. Audio analyzer (100, 600, 800) according to claim 19, wherein the audio analyzer is configured to determine the one or more critical passages (622) based on a comparison of the short-term intensity difference (112, 812) and / or based on a comparison of the short-term intensity information (112, 612, 1112) of the speech portion with a single threshold (621); and / or a plurality of thresholds (621).21 . Audio analyzer (100, 600, 800) according to claim 20, wherein the audio analyzer is configured to use different thresholds (621) for different sections of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241); and / orwherein the audio analyzer is configured to use different thresholds (621) for different types of audio signals of the audio content.

22. Audio analyzer (100, 600, 800) according to one of claims 20 to 21 , wherein the audio analyzer is configured to use one or more frequency-dependent thresholds (621).

23. Audio analyzer (100, 600, 800) according to one of claims 20 to 22, wherein the audio analyzer is configured to adapt one or more thresholds (621) using artificial intelligence.

24. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to perform an inference of a neural network in order to determine one or more critical passages (622) of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241); wherein a critical passage is a portion of the audio content in which an intensity of the speech portion is locally low in absolute terms and / or relatively to the background portion; and wherein the analysis result (102, 622) comprises an information about the one or more critical passages.

25. Audio analyzer (100, 600, 800) according to one of claims 19 to 24, wherein the audio analyzer is configured to determine an information of at least one of a start, an end, a duration, a quantity, a severity and / or criticalness, and / or a level of the criticalness a temporal locationof the one or more critical passages (622) and wherein the analysis result (102, 622) comprises said information.

26. Audio analyzer (100, 600, 800) according to one of claims 19 to 25, wherein the audio analyzer is configured to determine an information about a severity and / or criticalness of the one or more critical passages (622) using two or more states.

27. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to provide the analysis result (102, 622) in the form of a binary analysis result; or in the form of a ternary analysis result; or in the form of a quaternary analysis result.

28. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to determine the short-term intensity difference (112, 812) and / or the short-term intensity information (112, 612, 1112) of the speech portion as an approximation for an intelligibility or listening effort for the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

29. Audio analyzer (100, 600, 800) according to any of the preceding claims, wherein the audio analyzer is configured to determine an additional quality control information (614, 1114) based on the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

30. Audio analyzer (100, 600, 800) according to one of claims 1 to 29, wherein the audio analyzer is configured to use at least one absolute or relative threshold (621) on one or more audio components or on one or more groups of audio components as one or more desired criteria;wherein absolute thresholds are related to the short-term intensity (112, 612, 613, 1112, 1113) of one or more selected audio components or groups of audio components, and wherein relative thresholds are related to the short-term intensity differences (112, 812) between audio components or groups of audio components.

31. Audio analyzer (100, 600, 800) according to one of claims 1 to 30, wherein the audio analyzer is configured to combine multiple audio signals of the same or similar type to form component groups.

32. Audio analyzer (100, 600, 800) according to claim 31 , wherein the audio analyzer is configured to combine multiple audio signals of the same or similar type to form component groups based on an importance of the multiple audio signals, where the importance of the audio signals is manually set or determined based on the speech parts contained in the signal, and / or based on the contribution of each audio signal to the final mix, considering audio masking effects and the properties of the human hearing system.

33. An audio analyzer (200, 900, 1000), wherein the audio analyzer is configured to obtain an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) comprising a speech portion and a background portion; wherein the audio analyzer comprises a neural network (910, 1010, 1020) configured to derive a quality control information (202, 622) on the basis of the audio content.

34. Audio analyzer (200, 900, 1000) according to claim 33, wherein the neural network (910, 1010, 1020) is configured to obtain a representation of a short-term intensity difference (112, 812) between a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and a background portion of the audiocontent and / or a representation of a short-term intensity information (112, 612, 1112) of the speech portion of the audio content as an analysis result (102, 622), and wherein the audio analyzer is configured to provide the representation of the short-term intensity difference and / or the representation of the short-term intensity information (112, 612, 1112) of the speech portion of the audio content as the quality control information (202, 622).

35. Audio analyzer (200, 900, 1000) according to one of claims 33 to 34, wherein the neural network (910, 1010, 1020) is trained using an audio analyzer (100, 600, 800) according to claim 1 .

36. Audio analyzer (200, 900, 1000) according to one of claims 33 to 35, wherein the audio analyzer is configured to separate the speech portion and a background portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) in order to provide the separated speech portion and / or background portion to the neural network (910, 1010, 1020).

37. Audio analyzer (200, 900, 1000) according to one of claims 33 to 36, wherein the audio content (101 , 601 , 631 , 1001, 1201 , 1241) comprises the speech portion and the background portion in a combined manner (601); and wherein the audio analyzer is configured to provide the neural network (910, 1010, 1020) with the speech portion and the background portion in the combined manner (601).

38. Audio analyzer (200, 900, 1000) according to one of claims 33 to 37, wherein the audio analyzer is configured to provide the neural network (910, 1010, 1020) with the speech portion and the background portion in the form of individual signals (631).

39. Audio analyzer (200, 900, 1000) according to one of claims 33 to 38,wherein the audio analyzer comprises a first neural network (1010) for deriving the quality control information (202, 622) based on an audio mix of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241); and wherein the audio analyzer comprises a second neural network (1020) for deriving the quality control information based on the speech portion and the background portion of the audio content provided as separate entities of information.

40. Audio analyzer (200, 900, 1000) according to one of claims 33 to 39, wherein the audio analyzer comprises an end-to-end detector (910, 1010, 1020) to detect critical passages (622) directly from one or more input signals (601 , 631).

41. Audio analyzer (200, 900, 1000) according to claim 40, wherein the end-to-end detector is configured to switch between two submodules (1010, 1020) depending on an input format type.

42. An audio processor (300, 1100, 1200, 1300) for processing an audio content (101 , 601 , 631 , 1001 , 1201 , 1241), wherein the audio processor is configured to obtain an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) comprising a speech portion and a background portion; wherein the audio processor is configured to determine a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content, and / or wherein the audio processor is configured to determine a short-term intensity (112, 612, 1112) of the speech portion; and wherein the audio processor is configured to modify (310) the audio content in dependence of the short-term intensity difference and / or in dependence on the shortterm intensity of the speech portion, or wherein the audio processor is configured to determine a metadata information (321) about the audio content based on the short-term intensity difference and / or based onthe short-term intensity of the speech portion and to provide a file or stream (332), wherein the file or stream comprises the audio content and the metadata information.

43. Audio processor (300, 1100, 1200, 1300) according to claim 42, wherein the audio processor is configured to modify (310) a short-term intensity difference (112, 812) between a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and a background portion of the audio content, in order to obtain a processed version of the audio content; and / or wherein the audio processor is configured to modify a short-term intensity of a speech portion of the audio content, in order to obtain a processed version of the audio content.

44. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 43, wherein the audio processor is configured to modify the obtained audio content (101 , 601 , 631 , 1001 , 1201 , 1241) with a temporal resolution of no more than 3000ms, or with a temporal resolution of no more than 1000ms, or with a temporal resolution of no more than 400ms, or with a temporal resolution of no more than 100ms, or with a temporal resolution of no more than 40ms, or with a temporal resolution of no more than 20ms, in order to obtain a processed version (312) of the audio content; or wherein the audio processor is configured to modify (310) the obtained audio content with a temporal resolution between 3000ms and 400ms.

45. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 44, wherein the audio processor is configured to modify (310) the obtained audio content (101 , 601, 631 , 1001, 1201 , 1241) with a temporal resolution of one audio frame, or with a temporal resolution of two audio frames, or with a temporal resolution of no more than 10 audio frames, in order to obtain a processed version (312) of the audio content.

46. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 45, wherein the audio processor is configured to scale a speech portion of the obtained audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and / or a background portion of theobtained audio content, in order to obtain a processed version (312) of the audio content.

47. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 46, wherein the audio processor is configured to provide or alter metadata, in order to obtain a processed version (312) of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

48. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 47, wherein the audio processor is configured to determine a metadata information (321 , 1131) about the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) based on the shortterm intensity difference (112, 812) and / or based on the short-term intensity of the speech portion, so that based on the metadata information a relationship between the speech portion and the background portion of the audio content can be modified and / or so that based on the metadata information the speech portion can be modified; and wherein the audio processor is configured to provide a modified audio content, comprising the audio content and the metadata information.

49. Audio processor (300, 1100, 1200, 1300) according to claim 48, wherein the audio processor is configured to format the metadata information according to an audio data frame rate of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

50. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 49, wherein the audio processor is configured to separate (1310) the speech portion and the background portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

51. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 50, comprising an audio analyzer according to one of claims 1 to 29 or 100 to 106; and wherein the audio processor is configured to modify (310) the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) in dependence on the analysis result (102, 112).

52. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 51 , comprising an audio analyzer (100, 200, 600, 800, 900, 1000) according to one of claims 1 to 32 or 33 to 41 ; and wherein the audio processor is configured to modify or generate a or the metadata information according to the results of the audio analyzer.

53. Audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 52, comprising an audio analyzer (100, 200, 600, 800, 900, 1000) according to one of claims 1 to 32 or 33 to 41 ; and wherein the audio processor is configured to store a or the metadata information aligned with the audio data in a file or stream (332).

54. A bitstream provider (400, 1400, 1700), wherein the bitstream provider is configured to include an encoded representation (401) of an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and a quality control information (402, 512, 1131 , 1512) into a bitstream (403, 501 , 1402, 1702).

55. Bitstream provider (400, 1400, 1700) according to claim 54, wherein the quality control information (402, 512, 1131 , 1512) enables or supports a decoder-sided modification of a relationship between an intensity of a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and a background portion of the audio content; and / or wherein the quality control information enables or supports a decoder-sided modification of the speech portion.

56. Bitstream provider (400, 1400, 1700) according to one of claims 54 or 55,wherein the quality control information (402, 512, 1131 , 1512) enables or supports a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

57. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 56, wherein the quality control information (402, 512, 1131 , 1512) selectively enables and disables a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241), or wherein the quality control information indicates for which passages of the audio content a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content is allowable.

58. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 57, wherein the quality control information (402, 512, 1131 , 1512) comprises an information with respect to critical time portions (622) of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

59. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 58, wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating for which passages of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content is considered recommendable under hindered listening conditions.

60. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 59, wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating whether a portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) comprises a speech intelligibility measure or a speech intelligibility related characteristic which is in a predetermined relationship with one or more threshold values (621).61 . Bitstream provider (400, 1400, 1700) according to one of claims 54 to 60,wherein the quality control information (402, 512, 1131 , 1512) comprises an information quantitatively describing a speech intelligibility related characteristic of a portion of the audio content (101 , 601 , 631 , 1001 , 1201, 1241).

62. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 61 , wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating whether an audio scene is considered to be hard to understand or easy to understand63. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 62, wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating whether an audio scene is considered to be understandable with low listening effort, or to be understandable with medium listening effort, or to be understandable with high listening effort.

64. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 63, wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating passages in the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) in which a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content is smaller than a threshold value (621) or equal to a threshold value (621); and / or wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating passages in the audio content in which a short-term intensity (112, 612, 1112) of a speech portion of the audio content is smaller than a threshold value (621) or equal to a threshold value (621).

65. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 64, wherein the quality control information (402, 512, 1131 , 1512) describes a short-term intensity difference (112, 812) between a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and a background portion of the audio content; and / orwherein the quality control information describes a short-term intensity (112, 612, 1112) of the speech portion of the audio content.

66. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 65, wherein the bitstream provider is configured to add the quality control information (402, 512, 1131 , 1512) to pre-existing metadata (1511 , 1503, 1504).

67. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 66, wherein the bitstream provider is configured to adapt processing parameters for a decoding of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) in dependence on a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content and / or in dependence on a short-term intensity (112, 612, 1112) of the speech portion.

68. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 67, wherein the bitstream provider is configured to include the quality control information (402, 512, 1131 , 1512) into an extension payload of a bitstream stream (403, 501 , 1402), 1702.

69. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 68, wherein the bitstream provider comprises an audio analyzer (100, 200, 600, 800, 900, 1000) according to one of claims 1 to 32 or 33 to 41 and wherein the bitstream provider is configured to determine the quality control information (402, 512, 1131 , 1512) in dependence on the analysis result (102, 622); and / or wherein the bitstream provider comprises an audio processor (300, 1100, 1200, 1300) according to one of claims 42 to 53.

70. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 69, wherein the bitstream provider is configured to format the quality control information (402, 512, 1131 , 1512) into quality control metadata packets.71 . Bitstream provider (400, 1400, 1700) according to one of claims 54 to 69, wherein the bitstream provider is configured to encapsulate quality control metadata in data packets, and to insert the data packets into an audio bitstream (403, 501 , 1402, 1702) when performing an encoding.

72. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 71 , wherein the bitstream provider is implemented using a neural network, wherein the neural network is configured to receive a representation of an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and to provide, on the basis thereof, the quality control information (402, 512, 1131 , 1512); wherein the neural network is trained using training audio scenes which are labeled with respect to a speech intelligibility.

73. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 72, wherein the bitstream provider is implemented using a neural network , wherein the neural network is configured to receive a representation of an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and to provide, on the basis thereof, the quality control information (402, 512, 1131 , 1512); wherein the neural network is trained using an audio analyzer (100, 600, 800) according to one of claims 1 to 32, and wherein the audio analyzer is configured to provide a reference quality control information for the training of the neural network on the basis of a plurality of audio scenes.

74. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 73, wherein the quality control information (402, 512, 1131 , 1512) comprises clarity information metadata, orwherein the quality control information (402, 512, 1131 , 1512) comprises accessibility enhancement metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises speech transparency metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises speech enhancement metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises understandability metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises content description metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises local enhancement metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises signal descriptive metadata.

75. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 74, wherein the bitstream provider is configured to include the quality control information (402, 512, 1131 , 1512) into an MHAS packet76. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 75, wherein the bitstream provider is configured to provide audio quality control metadata (e.g. qclnfo()) and an information about the audio quality control metadata; wherein the information about the audio quality control metadata describes how many data structures qclnfo() carrying audio quality control metadata are present in an MHAS packet, and / orwherein the information about the audio quality control metadata describes, or gives an indication, when the audio quality control metadata should be applied (e.g. qcInfoActive), and / or wherein the information about the audio quality control metadata describes, or gives an indication, in which cases the audio quality control metadata should be applied, and / or wherein the information about the audio quality control metadata describes, or gives an indication, in which cases a respective decoder or respective Tenderer may choose to apply the audio quality control metadata, and / or wherein the information about the audio quality control metadata indicates whether the audio quality control metadata is associated with a specific audio element or with an audio scene defined by a combination of audio elements; and / or wherein the information about the audio quality control metadata indicates a type of audio content (101 , 601 , 631 , 1001 , 1201 , 1241) the audio quality control metadata is associated with; and / or wherein the information about the audio quality control metadata indicates to which type of audio content the audio quality control metadata may be applied to, in order to manipulate the an audio element with the respective type; and / or wherein the information about the audio quality control metadata comprises an identifier indicating to which audio element or group of audio elements a respective audio quality control metadata is associated.

77. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 76, wherein the bitstream provider is configured to provide audio quality control information (402, 512, 1131 , 1512) with a first granularity and audio quality control information with a second granularity.

78. Bitstream provider (400, 1400, 1700) according to one of claims 54 to 77,wherein the bitstream provider is configured to provide a plurality of different audio quality control metadata associated with different audio elements and / or different combinations of audio elements.

79. An audio decoder (500, 1500, 1600, 1800) for providing a decoded audio representation (502, 1502, 1602) on the basis of an encoded media representation (403, 501 , 1402, 1702), wherein the audio decoder is configured to obtain a quality control information (402, 512, 1131 , 1512) from the encoded media representation; and wherein the audio decoder is configured to provide the decoded audio representation in dependence on the quality control information.

80. Audio decoder (500, 1500, 1600, 1800) according to claim 79, wherein the encoded media representation (403, 501 , 1402, 1702) comprises a representation of an audio content (101 , 601 , 631 , 1001 , 1201 , 1241) comprising a speech portion and a background portion; wherein the audio decoder is configured to receive a quality control information (402, 512, 1131 , 1512) comprising at least one of an information for modifying a relationship between an intensity of the speech portion of the audio content and the background portion of the audio content; an information for modifying a speech portion of the audio content; an information for improving a speech intelligibility of a speech portion of the audio content; an information for selectively enabling and disabling an improvement of a speech intelligibility of the speech portion of the audio content; an information indicating for which passages of the audio content an improvement of a speech intelligibility of the speech portion of the audio content is allowable;an information indicating critical time portions (622) of the audio content; an information indicating for which passages of the audio content an improvement of a speech intelligibility of the speech portion of the audio content is considered recommendable under hindered listening conditions; an information indicating whether a portion of the audio content comprises a speech intelligibility measure or a speech intelligibility related characteristic which is in a predetermined relationship with one or more threshold values; an information indicating whether an audio scene is considered to be hard to understand or easy to understand, an information indicating whether an audio scene is considered to be understandable with low listening effort, or to be understandable with medium listening effort, or to be understandable with high listening effort; an information indicating passages in the audio content in which a short-term intensity difference (112, 812) between the speech portion of the audio content and the background portion of the audio content is smaller than a threshold value or equal to a threshold value; an information indicating passages in the audio content in which a short-term intensity of the speech portion of the audio content is smaller than a threshold value or equal to a threshold value; and to provide the decoded audio information in dependence thereof.

81. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 or 80, wherein the audio decoder is configured to perform a speech enhancement in dependence on the quality control information (402, 512, 1131 , 1512).

82. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 81 ,wherein the audio decoder is configured to selectively perform the speech enhancement for passages of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) indicated by the quality control information (402, 512, 1131 , 1512).

83. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 82, wherein the audio decoder is configured to selectively perform the speech enhancement for passages of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) for which the quality control information (402, 512, 1131 , 1512) indicates a difficult intelligibility.

84. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 83, wherein the audio decoder is configured to receive a control information defining whether a speech enhancement should be performed, and wherein the audio decoder is configured to activate and deactivate the speech enhancement in dependence on the control information defining whether a speech enhancement should be performed.

85. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 84, wherein the audio decoder is configured to receive a control information defining an interaction with an audio scene; and wherein the audio decoder is configured to activate and deactivate the speech enhancement in dependence on the control information defining an interaction with the audio scene, and / or wherein the audio decoder is configured to adjust one or more parameters of the speech enhancement in dependence on the control information defining an interaction with the audio scene.

86. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 85, wherein the audio decoder is configured to adjust one or more parameters of a speech enhancement in dependence on the quality control information (402, 512, 1131 , 1512).

87. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 86, wherein the audio decoder is configured to obtain an information about a listening environment (1504), and wherein the audio decoder is configured to decide whether to perform a speech enhancement or not in dependence on the information about the listening environment and in dependence on the quality control information (402, 512, 1131 , 1512).

88. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 87, wherein the audio decoder is configured to obtain an information about a listening environment (1504), and wherein the audio decoder is configured to adjust one or more parameters of a speech enhancement in dependence on the quality control information (402, 512, 1131 , 1512) and in dependence on the information about the listening environment.

89. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 88, wherein the audio decoder is configured to obtain a user input (1503), and wherein the audio decoder is configured to decide whether to perform a speech enhancement or not in dependence on the user input and in dependence on the quality control information (402, 512, 1131 , 1512).

90. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 89, wherein the audio decoder is configured to obtain a system level information (1503), and wherein the audio decoder is configured to decide whether to perform a speech enhancement or not in dependence on the information about the listening environment and in dependence on the quality control information (402, 512, 1131 , 1512).

91. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 90,wherein the audio decoder is configured to obtain an information about one or more sound reproduction devices, and wherein the audio decoder is configured to adjust one or more parameters of a speech enhancement in dependence on the quality control information (402, 512, 1131 , 1512) and in dependence on the information about the one or more sound reproduction devices.

92. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 91 , wherein the audio decoder is configured to obtain one or more out of the following system level information (1503): o an information about a system setting, o an information about a user setting, o an information about an environment and o an information about one or more additional devices, and wherein the audio decoder is configured to perform one or more of the following functionalities in dependence on the quality control information (402, 512, 1131 , 1512) and the system level information: o decide of a critical passage is present in the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and requires improvement o decide on the level and / or intensity of the quality improvement to be applied o derive a quality control information required by an audio decoder to enhance an audio quality of one or more critical passages for improving an intelligibility and / or reducing a listening effort.

93. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 92, wherein the quality control information (402, 512, 1131 , 1512) comprises one or more ofo one or more gain sequences which need to be applied to one or more audio signals part of an audio scene or to one or more portions of an audio content (101, 601, 631 , 1001, 1201, 1241) o information about which signals or which portions of an audio content should be processed in order to improve one or more critical passages (622) o information about a duration of the one or more critical passages.

94. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 93, wherein the audio decoder is configured to apply the quality control information (402, 512, 1131, 1512) in order to obtain a quality-enhanced version of the audio content.

95. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 94, wherein the audio decoder is configured to apply the quality control information (402, 512, 1131, 1512) to the audio content (101 , 601, 631 , 1001, 1201, 1241) in order to obtain a quality-enhanced version of the audio content.

96. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 95, wherein the audio decoder is configured to perform a filtering (1630) in order to obtain a quality-enhanced version of the audio content (101, 601, 631, 1001, 1201, 1241), wherein the audio decoder is configured to determine one or more filter coefficients of the filtering in dependence on the quality control information (402, 512, 1131, 1512).

97. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 96, wherein the audio decoder is configured to perform a filtering (1630) in order to obtain a quality-enhanced version of the audio content (101, 601, 631, 1001, 1201, 1241), wherein the audio decoder is configured to determine one or more filter coefficients of the filtering in dependence on the quality control information (402, 512, 1131, 1512).

98. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 97,wherein the audio decoder is configured to determine one or more filter coefficients of the filtering in dependence on a system level information (1503)., and / or in dependence on an information about one or more sound reproduction devices, and / or in dependence on an information about a listening environment (1504), and / or in dependence on an information about a user input (1503).

99. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 98, wherein the audio decoder is configured to apply the filtering (1630) to one or more output signals of a decoder core (1520, 1620), or wherein the audio decoder is configured to apply the filtering to one or more rendered audio signals (1502) which are obtained using a rendering of output signals of a decoder core.

100. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 99, wherein the audio decoder is configured to trigger a time-frequency modification in dependence on the quality control information (402, 512, 1131 , 1512).

101. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 100, wherein the audio decoder is configured to detect one or more critical passages present in at least one audio signal contained in the encoded media representation (403, 501 , 1402, 1702).

102. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 101 , wherein the audio decoder is configured to decode encoded audio data and to process one or more detected critical passages.

103. Audio decoder (500, 1500, 1600, 1800) according to claim 102,wherein the audio decoder is configured to process the one or more detected critical passages to improve an audio quality of an audio scene and / or to reduce a listening effort for the user.

104. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 103, wherein the quality control information (402, 512, 1131 , 1512) comprises metadata associated with the audio scene containing information about critical passages present in at least one audio signal contained in the audio stream; wherein the audio decoder is configured to process the information about critical passages present in at least one audio signal contained in the encoded media representation (403, 501 , 1402, 1702) and at least one additional information coming from a system level or from other metadata in the encoded media representation, to decide if critical passages present in at least one audio signal contained in the encoded media representation can be improved, wherein the audio decoder is configured to decode an encoded audio stream included in the encoded media representation or making up the encoded media representation, and at the decision that critical passages present in at least on audio signal contained in the audio stream can be improved, use the information about critical passages present in at least on audio signal to improve the audio quality of the complete audio scene.

105. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 104, wherein the information about critical passages contains at least one parameter associated with the short-term intensity (112, 612, 1112) of an audio signal in the audio scene or associated with the short-term intensity differences (112, 812) between two or more audio types contained in the audio scene.

106. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 105, wherein the information about critical passages contains at least one of the following parameters:Information about which audio signals contain critical passages;Information about which audio signals require to be processed in order to improve the critical passages, which might not be present all audio signals;One or more gain sequences, or with a temporal resolution of no more than 1000ms, or with a temporal resolution of no more than 400ms, or of no more than 100ms, or of no more than 40ms, or of no more than 20ms, or with a temporal resolution between 3000ms and 400ms, or of one audio frame, or of two audio frames, or of no more than ten audio frames] which need to be applied to one or more audio signals;Information about the start, and / or end and / or duration of at least one critical passage,Short-term intensity values associated with at least one audio signal;Short-term intensity differences (112, 812) associated with at least two audio types, which can be characterized e.g., as dialog and / or commentator and / or background and / or music and effects.

107. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 106, wherein the audio decoder is configured to evaluate the quality control information (402, 512, 1131 , 1512), which is included in an MHAS packet.

108. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 107, wherein the audio decoder is configured to evaluate an audio quality control metadata (e.g. qclnfo()) and an information about the audio quality control metadata; wherein the information about the audio quality control metadata describes how many data structures qclnfo() carrying audio quality control metadata are present in an MHAS packet, and / or wherein the information about the audio quality control metadata describes, or gives an indication, when the audio quality control metadata should be applied (e.g. qcInfoActive), and / or wherein the information about the audio quality control metadata describes, or gives an indication, in which cases the audio quality control metadata should be applied, and / orwherein the information about the audio quality control metadata describes, or gives an indication, in which cases a respective decoder or respective Tenderer may choose to apply the audio quality control metadata, and / or wherein the information about the audio quality control metadata indicates whether the audio quality control metadata is associated with a specific audio element or with an audio scene defined by a combination of audio elements; and / or wherein the information about the audio quality control metadata indicates a type of audio content (101 , 601 , 631 , 1001 , 1201 , 1241) the audio quality control metadata is associated with; and / or wherein the information about the audio quality control metadata indicates to which type of audio content the audio quality control metadata may be applied to, in order to manipulate the an audio element with the respective type; and / or wherein the information about the audio quality control metadata comprises an identifier indicating to which audio element or group of audio elements a respective audio quality control metadata is associated.

109. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 108, wherein the audio decoder is configured to evaluate audio quality control information (402, 512, 1131 , 1512) with a first granularity and audio quality control information with a second granularity.

110. Audio decoder (500, 1500, 1600, 1800) according to one of claims 79 to 109, wherein the audio decoder is configured to evaluate a plurality of different audio quality control metadata associated with different audio elements and / or different combinations of audio elements.

111. Method for analyzing an audio content (101 , 601 , 631 , 1001 , 1201 , 1241), comprising: obtaining the audio content, the audio content comprising a speech portion and a background portion;determining a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content, and / or determining a short-term intensity information (112, 612, 1112) of a speech portion of the audio content, and providing a representation of the short-term intensity difference (112, 812) and / or a representation of the short-term intensity information of the speech portion as an analysis result, or deriving an analysis result from the short-term intensity difference (112, 812) and / or from the short-term intensity information of the speech portion.

112. Method for analyzing an audio content (101 , 601 , 631 , 1001 , 1201 , 1241), comprising obtaining the audio content comprising a speech portion and a background portion; deriving, using a neural network, a quality control information (402, 512, 1131 , 1512) on the basis of the audio content.

113. Method for processing an audio content (101 , 601 , 631 , 1001 , 1201, 1241), obtaining the audio content wherein the audio content comprises a speech portion and a background portion; determining a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content; and / or determining a short-term intensity of the speech portion, and modifying the audio content in dependence of the short-term intensity difference (112, 812) and / or in dependence on the short-term intensity of the speech portion.

114. Method for providing a bitstream (403, 501 , 1402, 1702) comprising:including an encoded representation of an audio content (101, 601, 631, 1001, 1201, 1241) and a quality control information (402, 512, 1131, 1512) into a bitstream.

115. Method for providing a decoded audio representation on the basis of an encoded media representation, comprising: obtaining a quality control information (402, 512, 1131 , 1512) from the encoded media representation; and providing the decoded audio representation in dependence on the quality control information.

116. A computer program for performing the method according to claim 111, 112, 113, 114 or 115, when the computer program runs on a computer.

117. A bitstream (403, 501, 1402, 1702), comprising: an encoded representation of an audio content (101 , 601 , 631, 1001 , 1201, 1241); and a quality control information (402, 512, 1131, 1512).

118. Bitstream (403, 501, 1402, 1702) according to claim 117, wherein the quality control information (402, 512, 1131, 1512) enables or supports a decoder-sided modification of a relationship between an intensity of a speech portion of the audio content (101, 601, 631, 1001, 1201, 1241) and a background portion of the audio content; and / or wherein the quality control information (402, 512, 1131, 1512) enables or supports a decoder-sided modification of the speech portion.

119. Bitstream (403, 501, 1402, 1702) according to one of claims 117or 118, wherein the quality control information (402, 512, 1131, 1512) enables or supports a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content (101, 601, 631 , 1001 , 1201, 1241).

120. Bitstream (403, 501, 1402, 1702) according to one of claims 117to 119,wherein the quality control information (402, 512, 1131 , 1512) selectively enables and disables a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241), or wherein the quality control information indicates for which passages of the audio content a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content is allowable.

121. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 120, wherein the quality control information (402, 512, 1131 , 1512) comprises an information with respect to critical time portions of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241).

122. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 121 , wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating for which passages of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) a decoder-sided improvement of a speech intelligibility of a speech portion of the audio content is considered recommendable under hindered listening conditions.

123. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 122, wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating whether a portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) comprises a speech intelligibility measure or a speech intelligibility related characteristic which is in a predetermined relationship with one or more threshold values.

124. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 123, wherein the quality control information (402, 512, 1131 , 1512) comprises an information quantitatively describing a speech intelligibility related characteristic of a portion of the audio content (101 , 601 , 631 , 1001 , 1201, 1241).

125. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 124,wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating whether an audio scene is considered to be hard to understand or easy to understand126. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 125, wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating whether an audio scene is considered to be understandable with low listening effort, or to be understandable with medium listening effort, or to be understandable with high listening effort.

127. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 126, wherein the quality control information (402, 512, 1131 , 1512) comprises an information indicating passages in the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) in which a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content is smaller than a threshold value or equal to a threshold value; and / or wherein the quality control information comprises an information indicating passages in the audio content in which a short-term intensity of a speech portion of the audio content is smaller than a threshold value or equal to a threshold value.

128. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 127, wherein the quality control information (402, 512, 1131 , 1512) describes a short-term intensity difference (112, 812) between a speech portion of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) and a background portion of the audio content; and / or wherein the quality control information describes a short-term intensity of the speech portion of the audio content.

129. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 128,wherein the bitstream comprises an information for adapting processing parameters for a decoding of the audio content (101 , 601 , 631 , 1001 , 1201 , 1241) based on a shortterm intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content and / or based on a short-term intensity of the speech portion.

130. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 129, wherein the bitstream comprises an extension payload and wherein the extension payload comprises the quality control information (402, 512, 1131 , 1512).

131. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 130, wherein the bitstream comprises quality control metadata packets to which the quality control information (402, 512, 1131 , 1512) is formatted.

132. Bitstream (403, 501 , 1402, 1702) according to one of claims 117to 131 , wherein the bitstream comprises data packets, in which the quality control metadata is encapsulated.

133. Bitstream (403, 501 , 1402, 1702) according to one of claims 117 to 132, wherein the quality control information (402, 512, 1131 , 1512) comprises clarity information metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises accessibility enhancement metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises speech transparency metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises speech enhancement metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises understandability metadata, orwherein the quality control information (402, 512, 1131 , 1512) comprises content description metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises local enhancement metadata, or wherein the quality control information (402, 512, 1131 , 1512) comprises signal descriptive metadata.

134. Audio analyzer (100, 600, 800), according to one of claims 1 to 41 , configured to obtain an averaged speech information of the audio content; compare the short-term intensity information to the averaged speech information in order to obtain a comparison result; derive an analysis result comprising an information about a deviation of the short-term intensity information from the averaged speech information, based on the comparison result.

135. Audio analyzer according to claim 134, wherein the averaged speech information comprises at least one of an information about an averaged speech level or about an averaged speech intensity or about an averaged speech loudness of the audio content.

136. Audio analyzer according to claim 134 or 135, configured to determine the averaged speech information based on an averaging over a predetermined time interval of the audio content.

137. Audio analyzer according to one of claims 134 to 136, configured to provide the analysis result based on a combined evaluation of the short-term intensity difference and of the deviation of the short-term intensity information from the averaged speech information.

138. Audio analyzer according to one of claims 134 to 137, configured to determine an information about a local speech level as the short-term intensity information; determine the averaged speech information based on a speech loudness averaged over the full audio content, or averaged over a time period having a length which is at least ten times longer than a duration over which the short-term intensity difference or the short-term intensity information is determined; compare the local speech level to the averaged speech information in order to obtain the comparison result; derive an analysis result based on an evaluation of the comparison result with regard to a threshold.

139. Audio analyzer according to one of claims 134 to 138, configured to determine an information about an evolution over time of a short-term intensity difference between a speech portion of the audio content and a background portion of the audio content, and / or to determine an information about an evolution over time of a short-term intensity information (112, 612, 1112) of a speech portion of the audio content; and to derive an analysis result (102, 622) from the information about the evolution over time of the short-term intensity difference and / or from the evolution over time of the short-term intensity information of the speech portion.

140. An audio analyzer (100, 600, 800), wherein the audio analyzer is configured to obtain an audio content (101, 601 , 631, 1001, 1201, 1241) of an audio scene comprising a speech portion and a background portion;wherein the audio analyzer is configured to determine a short-term intensity difference (112, 812) between a speech portion of the audio content and a background portion of the audio content, and / or wherein the audio analyzer is configured to determine a short-term intensity information(112, 612, 1112) of a speech portion of the audio content, and wherein the audio analyzer is configured to derive an analysis result (102, 622) from the short-term intensity difference and / or from the short-term intensity information of the speech portion, in order to provide an information about critical passages of the audio scene for which specific signal characteristics of at least one audio component in the audio scene do not meet one or more predefined criteria.

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