Temporal and spatial shaping of multi-channel audio signals
First Claim
1. Decoder for generating a multi-channel output signal based on a base signal derived from an original multi-channel signal having one or more channels, the number of channels of the base signal being smaller than the number of channels of the original multi-channel signal, the base signal having a frame, the frame comprising sampling values having a high resolution, and based on a wave form parameter representation representing a wave form of an intermediate resolution representation of a selected original channel of the original multi-channel signal, the wave form parameter representation including a sequence of intermediate wave form parameters having an intermediate time resolution lower than the high time resolution of the sampling values and higher than a low time resolution defined by a frame repetition rate, comprising:
- an upmixer for generating a plurality of upmixed channels having a time resolution higher than the intermediate resolution and for deriving an intermediate resolution representation of the base signal used to generate the upmixed channels; and
a shaper for deriving a reference wave form parameter representation of the intermediate resolution representation of the base signal and for shaping a selected upmixed channel using the reference wave form parameter representation and the intermediate waveform parameters of the selected original channel corresponding to the selected upmixed channel.
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Accused Products
Abstract
A selected channel of a multi-channel signal represented by frames composed from sampling values having a high time resolution is provided that can be encoded with higher quality when a wave form parameter representation representing a wave form of an intermediate resolution representation of the selected channel is derived. The wave form parameter representation with the intermediate resolution can be used to shape a reconstructed channel to retrieve a channel having a signal envelope close to a selected original channel. The time scale on which the shaping is performed is shorter than the time scale of a framewise processing, thus enhancing the quality of the reconstructed channel. On the other hand, the shaping time scale is larger than the time scale of the sampling values, significantly reducing the amount of data needed by the wave form parameter representation.
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Citations
22 Claims
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1. Decoder for generating a multi-channel output signal based on a base signal derived from an original multi-channel signal having one or more channels, the number of channels of the base signal being smaller than the number of channels of the original multi-channel signal, the base signal having a frame, the frame comprising sampling values having a high resolution, and based on a wave form parameter representation representing a wave form of an intermediate resolution representation of a selected original channel of the original multi-channel signal, the wave form parameter representation including a sequence of intermediate wave form parameters having an intermediate time resolution lower than the high time resolution of the sampling values and higher than a low time resolution defined by a frame repetition rate, comprising:
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an upmixer for generating a plurality of upmixed channels having a time resolution higher than the intermediate resolution and for deriving an intermediate resolution representation of the base signal used to generate the upmixed channels; and a shaper for deriving a reference wave form parameter representation of the intermediate resolution representation of the base signal and for shaping a selected upmixed channel using the reference wave form parameter representation and the intermediate waveform parameters of the selected original channel corresponding to the selected upmixed channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. Method for generating a multi-channel output signal based on a base signal derived from an original multi-channel signal having one or more channels, the number of channels of the base signal being smaller than the number of channels of the original multi-channel signal, the base signal having a frame, the frame comprising sampling values having a high resolution, and based on a wave form parameter representation representing a wave form of an intermediate resolution representation of a selected original channel of the original multi-channel signal, the wave form parameter representation including a sequence of intermediate wave form parameters having an intermediate time resolution lower than the high time resolution of the sampling values and higher than a low time resolution defined by a frame repetition rate, the method comprising:
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deriving an intermediate resolution representation of the base signal used to generate the upmixed channels; generating a plurality of upmixed channels having a time resolution higher than the intermediate resolution; deriving a reference wave form parameter representation of the intermediate resolution representation of the base signal; and shaping a selected upmixed channel using the reference wave form parameter representation and the intermediate waveform parameters of the selected original channel corresponding to the selected upmixed channel. - View Dependent Claims (22)
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20. Receiver or audio player having a decoder for generating a multi-channel output signal based on a base signal derived from an original multi-channel signal having one or more channels, the number of channels of the base signal being smaller than the number of channels of the original multi-channel signal, the base signal having a frame, the frame comprising sampling values having a high resolution, and based on a wave form parameter representation representing a wave form of an intermediate resolution representation of a selected original channel of the original multi-channel signal, the wave form parameter representation including a sequence of intermediate wave form parameters having an intermediate time resolution lower than the high time resolution of the sampling values and higher than a low time resolution defined by a frame repetition rate, comprising:
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an upmixer for generating a plurality of upmixed channels having a time resolution higher than the intermediate resolution and for deriving an intermediate resolution representation of the base signal used to generate the upmixed channels; and a shaper for deriving a reference wave form parameter representation of the intermediate resolution representation of the base signal and for shaping a selected upmixed channel using the reference wave form parameter representation and the intermediate waveform parameters of the selected original channel corresponding to the selected upmixed channel.
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21. Method of receiving or audio playing, the method having a method for generating a multi-channel output signal based on a base signal derived from an original multi-channel signal having one or more channels, the number of channels of the base signal being smaller than the number of channels of the original multi-channel signal, the base signal having a frame, the frame comprising sampling values having a high resolution, and based on a wave form parameter representation representing a wave form of an intermediate resolution representation of a selected original channel of the original multi-channel signal, the wave form parameter representation including a sequence of intermediate wave form parameters having an intermediate time resolution lower than the high time resolution of the sampling values and higher than a low time resolution defined by a frame repetition rate, the method comprising:
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deriving an intermediate resolution representation of the base signal used to generate the upmixed channels; generating a plurality of upmixed channels having a time resolution higher than the intermediate resolution; deriving a reference wave form parameter representation of the intermediate resolution representation of the base signal; and shaping a selected upmixed channel using the intermediate waveform parameters of the selected original channel corresponding to the selected upmixed channel.
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Specification