Re-quantization device having noise shaping function, signal compression device having noise shaping function, and signal transmission device having noise shaping function
AssigneeNagoya Institute of Technology
InventorAkihiko Yoneya
Life of this patent
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Abstract
What is provided is a subtractor, as a re-quantization device, which is configured to detect re-quantization noise, a discrete time filter which is configured to perform frequency weighting on the detected re-quantization noise, an adder which is configured to add an additional signal to quantization noise, and an additional signal selector which is configured to select a value at the present time of a column of an additional signal for minimizing the magnitude of quantization noise having been subjected to frequency weighting evaluated one sampling or more later.
Claims14
A re-quantization device having a noise shaping function, the re-quantization device comprising:
- a subtractor which is configured to input a high resolution signal being a pulse code modulation signal and output a low resolution signal being a pulse code modulation signal to detect re-quantization noise which is a difference between the high resolution signal and the low resolution signal;
- a discrete time filter which is configured to perform frequency weighting;
- a quantizer;
- an adder which is configured to add an additional signal to an output signal of the quantizer;
- and
- an additional signal selector which is configured to generate the additional signal,
- wherein the high resolution signal is input to the quantizer,
- a signal obtained by adding the additional signal to the output signal of the quantizer is set to be the low resolution signal,
- the re-quantization noise is input to the discrete time filter,
- the additional signal is calculated on the basis of values of the output signal of the discrete time filter from a present time to a finite step future,
- the additional signal has 31 or less values, and
- these processes are executed through batch processing.
A re-quantization device having a noise shaping function, the re-quantization device comprising:
- a subtractor which is configured to input a high resolution signal being a pulse code modulation signal and a known noise signal being a pulse code signal and outputs a signal obtained by synthesizing a low resolution signal being a pulse code modulation signal and the known noise signal to detect re-quantization noise which is a difference between the high resolution signal and a sum of the low resolution signal and the known noise signal;
- a discrete time filter which is configured to perform frequency weighting;
- a quantizer;
- an adder which is configured to add an additional signal to an output signal of the quantizer;
- and
- an additional signal selector which is configured to generate the additional signal,
- wherein the high resolution signal is input to the quantizer,
- a signal obtained by adding the additional signal to the output signal of the quantizer is set to be the low resolution signal,
- the re-quantization noise is input to the discrete time filter,
- the additional signal is calculated on the basis of values of the output signal of the discrete time filter from a present time to a finite step future,
- the additional signal has 31 or less values, and
- these processes are executed through batch processing.
Dependencies are inferred from the claim text.