Volume leveler controller and controlling method
Volume leveler controller and controlling method are disclosed. In one embodiment, A volume leveler controller includes an audio content classifier for identifying the content type of an audio signal in real time; and an adjusting unit for adjusting a volume leveler in a continuous manner based on the content type as identified. The adjusting unit may configured to positively correlate the dynamic gain of the volume leveler with informative content types of the audio signal, and negatively correlate the dynamic gain of the volume leveler with interfering content types of the audio signal.
1. A loudness normalization method based upon a target loudness value, the method comprising:
determining dynamic gain parameters to be applied to audio segments of an audio signal based upon short-term or long-term characteristics of the audio signal, said determining including determining one or more dynamic gain parameters for a first audio segment based on a short-term characteristic of the audio signal and the target loudness value, and determining one or more dynamic gain parameters for a second audio segment based on a long-term characteristic of the audio signal and the target loudness value;
modifying a loudness of the first audio segment by employing the one or more dynamic gain parameters for the first audio segment; and
modifying a loudness of the second audio segment by employing the one or more dynamic gain parameters for the second audio segment,
wherein a loudness of the audio signal on playback is consistent with the target loudness value over the audio segments.
2. The loudness normalization method of claim 1 , wherein the dynamic gain parameters are identified and applied in real time.
3. The loudness normalization method of claim 1 , wherein dialog enhancement is applied having an effect of making dialog more prominent within a particular context.
4. The loudness normalization method of claim 1 , wherein a loudness equalization is applied to have an effect on one or more playback levels on a tonal balance.
5. The loudness normalization method of claim 1 , wherein a parameter smoothing is applied to the dynamic gain parameters.
6. An audio processing apparatus configured to normalize loudness based upon a target loudness value, comprising:
at least one processor; and
at least one memory storing a computer program;
in which the at least one memory with the computer program is configured with the at least one processor to cause the audio processing apparatus to at least:
determine dynamic gain parameters to be applied audio segments of an audio signal based upon short-term or long-term characteristics of the audio signal, said determining including determining one or more dynamic gain parameters for a first audio segment based on a short-term characteristic of the audio signal and the target loudness value, and determining one or more dynamic gain parameters for a second audio segment based on a long-term characteristic of the audio signal and the target loudness value;
modify a loudness of the first audio segment by employing the one or more dynamic gain parameters for the first audio segment; and
modifying a loudness of the second audio segment by employing the one or more dynamic gain parameters for the second audio segment,
wherein a loudness of the audio signal on playback is consistent with the target loudness value over the audio segments.
7. The apparatus of claim 6 , wherein the dynamic gain parameters are identified and applied in real time.
8. The apparatus of claim 6 , wherein dialog enhancement is applied having an effect of making dialog more prominent within a particular context.
9. The apparatus of claim 6 , wherein a loudness equalization is applied to have an effect on one or more playback levels on a tonal balance.
10. The apparatus of claim 6 , wherein a parameter smoothing is applied to the dynamic gain parameters.
11. A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine for causing to perform operations, said operations comprising:
determining dynamic gain parameters to be applied to audio segments of an audio signal based upon short-term or long-term characteristics of the audio signal, said determining including determining one or more dynamic gain parameters for a first audio segment based on a short-term characteristic of the audio signal and the target loudness value, and determining one or more dynamic gain parameters for a second audio segment based on a long-term characteristic of the audio signal and the target loudness value;
modifying a loudness of the first audio segment by employing the one or more dynamic gain parameters for the first audio segment; and
modifying a loudness of the second audio segment by employing the one or more dynamic gain parameters for the second audio segment,
wherein a loudness of the audio signal on playback is consistent with the target loudness value over the audio segments.