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:

• 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.

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 input channel having associated therewith a multi-channel synthesizer control signal representing smoothing control information, comprising:

• a control signal provider for providing the control signal having the smoothing control information;
• 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.

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 input signal having associated therewith a multi-channel synthesizer control signal representing smoothing control information, comprising:

• providing the control signal having the smoothing control information;
• 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.

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;
• 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.

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 input channel having associated therewith a multi-channel synthesizer control signal representing smoothing control information, the receiver comprising:

• a control signal provider for providing the control signal having the smoothing control information;
• 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.

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 input channel having associated therewith a multi-channel synthesizer control signal representing smoothing control information, the receiver comprising:
• a control signal provider for providing the control signal having the smoothing control information;
• 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.

Method of transmitting or audio recording, the 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.

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 input signal having associated therewith a multi-channel synthesizer control signal representing smoothing control information, the method of generating comprising:

• providing the control signal having the smoothing control information;
• 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.

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 input signal having associated therewith a multi-channel synthesizer control signal representing smoothing control information, the method of generating comprising:
• providing the control signal having the smoothing control information;
• 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.