Noise-feedback for spectral envelope quantization
First Claim
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1. A method of transmitting an input audio signal, the method comprising:
- quantizing a current spectral magnitude of the input audio signal;
feeding back a quantization error of a previous spectral magnitude to influence quantization of the current spectral magnitude, wherein feeding back comprises adaptively modifying a quantization criterion to form a modified quantization criterion;
minimizing a current quantization error by using the modified quantization criterion;
forming a quantized spectral envelope based on the minimizing, wherein the steps of quantizing, feeding back, minimizing and forming are performed using a hardware-based audio coder; and
transmitting the quantized spectral envelope.
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Abstract
A method of transmitting an input audio signal is disclosed. A current spectral magnitude of the input audio signal is quantized. A quantization error of a previous spectral magnitude is fed back to influence quantization of the current spectral magnitude. The feeding back includes adaptively modifying a quantization criterion to form a modified quantization criterion. A current quantization error is minimized by using the modified quantization criterion. A quantized spectral envelope is formed based on the minimizing and the quantized spectral envelope is transmitted.
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Citations
26 Claims
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1. A method of transmitting an input audio signal, the method comprising:
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quantizing a current spectral magnitude of the input audio signal; feeding back a quantization error of a previous spectral magnitude to influence quantization of the current spectral magnitude, wherein feeding back comprises adaptively modifying a quantization criterion to form a modified quantization criterion; minimizing a current quantization error by using the modified quantization criterion; forming a quantized spectral envelope based on the minimizing, wherein the steps of quantizing, feeding back, minimizing and forming are performed using a hardware-based audio coder; and transmitting the quantized spectral envelope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for transmitting an input audio signal, the system comprising:
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a transmitter comprising a hardware-based audio coder, the hardware-based audio coder configured to quantize a current spectral magnitude of the input audio signal; feed back a quantization error of a previous spectral magnitude to influence quantization of the current spectral magnitude, wherein feeding back comprises adaptively modifying a quantization criterion to form a modified quantization criterion; minimize a current quantization error by using the modified quantization criterion; and form a quantized spectral envelope based on minimizing the current quantization error. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification