Apparatus and method for generating multi-channel synthesizer control signal and apparatus and method for multi-channel synthesizing

Method of generating a multi-channel synthesizer control signal, comprising:

• band-wise analyzing a multi-channel input signal;
• determining smoothing control information in response to the signal analyzing step, such that, in response to the smoothing control information, a post-processing step generates a post-processed reconstruction parameter or a post-processed quantity derived from the reconstruction parameter for a time portion of an input signal to be processed, with a band-wise smoothing control information being determined;
• and
• generating a control signal representing the smoothing control information as the multi-channel synthesizer control signal.

Multi-channel synthesizer for generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, comprising:

• a control signal provider for providing the multi-channel synthesizer control signal having smoothing control information, wherein the multi-channel synthesizer control signal representing the smoothing control information is associated to the at least one input channel;
• a post-processor for determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed, wherein the post-processor is operative to determine the post-processed reconstruction parameter or the post-processed quantity such that the value of the post-processed reconstruction parameter or the post-processed quantity is different from a value obtainable using requantization in accordance with the quantization rule;
• and
• a multi-channel reconstructor for reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value;
• the control signal including a smoothing control mask having a bit for each frequency band, the bit for each frequency band indicating whether the post-processor is to perform smoothing or not;
• and
• the post-processor being operative to perform smoothing in response to the smoothing control mask, only when a bit for the frequency band in the smoothing control mask has a predetermined value.

Method of generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, comprising:

• providing the multi-channel synthesizer control signal having the smoothing control information, wherein the multi-channel synthesizer control signal representing the smoothing control information is associated to the at least one input channel;
• determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed;
• and
• reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value;
• the control signal including a smoothing control mask having a bit for each frequency band, the bit for each frequency band indicating whether the post-processor is to perform smoothing or not;
• and
• the determining of the post-processed reconstruction parameter including smoothing in response to the smoothing control mask, only when a bit for the frequency band in the smoothing control mask has a predetermined value.

Transmitter or audio recorder having an apparatus for generating a multi-channel synthesizer control signal, the apparatus comprising:

• a signal analyzer for analyzing a multi-channel input signal, the signal analyzer being operative to perform band-wise analysis of the multi-channel input signal;
• a smoothing information calculator for determining smoothing control information in response to the signal analyzer, the smoothing information calculator being operative to determine the smoothing control information such that, in response to the smoothing control information, a synthesizer-side post-processor generates a post-processed reconstruction parameter or a post-processed quantity derived from the reconstruction parameter for a time portion of an input signal to be processed, the smoothing information calculator being operative to determine a band-wise smoothing control information;
• and
• a data generator for generating a control signal representing the smoothing control information as the multi-channel synthesizer control signal.

Receiver or audio player having a multi-channel synthesizer for generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, the receiver comprising:

• a control signal provider for providing a multi-channel synthesizer control signal having the smoothing control information, wherein the multi-channel synthesizer control signal representing the smoothing control information is associated to the at least one input channel;
• a post-processor for determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed, wherein the post-processor is operative to determine the post-processed reconstruction parameter or the post-processed quantity such that the value of the post-processed reconstruction parameter or the post-processed quantity is different from a value obtainable using requantization in accordance with the quantization rule;
• and
• a multi-channel reconstructor for reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value;
• the control signal including a smoothing control mask having a bit for each frequency band, the bit for each frequency band indicating whether the post-processor is to perform smoothing or not;
• and
• the post-processor being operative to perform smoothing in response to the smoothing control mask, only when a bit for the frequency band in the smoothing control mask has a predetermined value.

Transmission system having a transmitter and a receiver,

• the transmitter having an apparatus for generating a multi-channel synthesizer control signal, the apparatus comprising:
• a signal analyzer for analyzing a multi-channel input signal;
• a smoothing information calculator for determining smoothing control information in response to the signal analyzer, the smoothing information calculator being operative to determine the smoothing control information such that, in response to the smoothing control information, a synthesizer-side post-processor generates a post-processed reconstruction parameter or a post-processed quantity derived from the reconstruction parameter for a time portion of an input signal to be processed;
• and a data generator for generating a control signal representing the smoothing control information as the multi-channel synthesizer control signal;
• and
• the receiver having a multi-channel synthesizer for generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, the receiver comprising:
• a control signal provider for providing a multi-channel synthesizer control signal having the smoothing control information, wherein the multi-channel synthesizer control signal representing the smoothing control information is associated to the at least one input channel;
• a post-processor for determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed, wherein the post-processor is operative to determine the post-processed reconstruction parameter or the post-processed quantity such that the value of the post-processed reconstruction parameter or the post-processed quantity is different from a value obtainable using requantization in accordance with the quantization rule;
• and a multi-channel reconstructor for reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value, the control signal including a smoothing control mask having a bit for each frequency band, the bit for each frequency band indicating whether the post-processor is to perform smoothing or not;
• and
• the post-processor being operative to perform smoothing in response to the smoothing control mask, only when a bit for the frequency band in the smoothing control mask has a predetermined value.

Method of transmitting or audio recording, the method having a method of generating a multi-channel synthesizer control signal, the method comprising:

• band-wise analyzing a multi-channel input signal;
• determining smoothing control information in response to the signal analyzing step, such that, in response to the smoothing control information, a post-processing step generates a post-processed reconstruction parameter or a post-processed quantity derived from the reconstruction parameter for a time portion of an input signal to be processed, with a band-wise smoothing control information being determined;
• and
• generating a control signal representing the smoothing control information as the multi-channel synthesizer control signal.

Method of receiving or audio playing, the method including a method of generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, the method of generating comprising:

• providing a multi-channel synthesizer control signal having the smoothing control information, wherein the multi-channel synthesizer control signal representing the smoothing control information is associated to the at least one input channel;
• determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed;
• and
• reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value;
• the control signal including a smoothing control mask having a bit for each frequency band, the bit for each frequency band indicating whether the post-processor is to perform smoothing or not;
• and
• the determining of the post-processed reconstruction parameter including smoothing in response to the smoothing control mask, only when a bit for the frequency band in the smoothing control mask has a predetermined value.

Method of receiving and transmitting, the method including a transmitting method having a method of generating a multi-channel synthesizer control signal, the method comprising:

• analyzing a multi-channel input signal;
• determining smoothing control information in response to the signal analyzing step, such that, in response to the smoothing control information, a post-processing step generates a post-processed reconstruction parameter or a post-processed quantity derived from the reconstruction parameter for a time portion of an input signal to be processed;
• and generating a control signal representing the smoothing control information as the multi-channel synthesizer control signal;
• and
• including a receiving method having a method of generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, the method of generating comprising:
• providing a multi-channel synthesizer control signal having the smoothing control information, wherein the multi-channel synthesizer control signal representing the smoothing control information is associated to the at least one input channel;
• determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed;
• and reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value;
• the control signal including a smoothing control mask having a bit for each frequency band, the bit for each frequency band indicating whether the post-processor is to perform smoothing or not;
• and
• the determining of the post-processed reconstruction parameter including smoothing in response to the smoothing control mask, only when a bit for the frequency band in the smoothing control mask has a predetermined value.

Method of generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, comprising:

• providing the multi-channel synthesizer control signal having the smoothing control information, with the multi-channel synthesizer control signal representing the smoothing control information being associated with the at least one input channel;
• determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed;
• and
• reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value;
• the control signal including an all-off short cut signal, an all-on short cut signal or a repeat last mask short cut signal;
• and
• the determining of the post-processed reconstruction parameter including a smoothing operation, in response to the all-off short cut signal, the all-on short cut signal or the repeat last mask short cut signal.

Multi-channel synthesizer for generating an output signal from an input signal, the input signal having at least one input channel and a sequence of quantized reconstruction parameters, the quantized reconstruction parameters being quantized in accordance with a quantization rule, and being associated with subsequent time portions of the input signal, the output signal having a number of synthesized output channels, and the number of synthesized output channels being greater than the number of input channels, comprising:

• a control signal provider for providing the multi-channel synthesizer control signal having smoothing control information, the multi-channel synthesizer control signal representing the smoothing control information being associated with the at least one input channel;
• a post-processor for determining, in response to the control signal, the post-processed reconstruction parameter or the post-processed quantity derived from the reconstruction parameter for a time portion of the input signal to be processed, the post-processor being operative to determine the post-processed reconstruction parameter or the post-processed quantity such that the value of the post-processed reconstruction parameter or the post-processed quantity is different from a value obtainable using requantization in accordance with the quantization rule;
• and
• a multi-channel reconstructor for reconstructing a time portion of the number of synthesized output channels using the time portion of the input channel and the post-processed reconstruction parameter or the post-processed value;
• the control signal including an all-off short cut signal, an all-on short cut signal or a repeat last mask short cut signal;
• and
• the post-processor being operative to perform a smoothing operation, in response to the all-off short cut signal, the all-on short cut signal or the repeat last mask short cut signal.