Quantification noise reducing method and device

Abstract

The application discloses a quantification noise reducing method and device. After an original digital signal is subjected to framing operation, digital signal sampling points with a maximum amplitude are found in two continuous frames of signals which are respectively a current frame and a next frame, and maximum object digital gain which prevents the maximum amplitude from overflowing is obtained via calculation; object sampling points having minimum own energy and adjacent energy in the current frame are used as gain switching points; according to a gain switching position and a gain switching step number, original digital gain is gradually switched to object digital gain at the gain switching points, and analog gain is correspondingly adjusted. According to the quantification noise reducing method and device, a plurality of object sampling points with the maximum energy are used as the gain switching points; thus, compared with technologies of the prior art, the quantification noise reducing method and device effectively optimize selection of the gain switching points, the gain switching points are enabled to have the minimum adjacent energy, switching noise is lowered to the minimum, and therefore quantification noise is lowered to the minimum and audio quality of signals can be improved.

Description

technical field [0001] The present invention relates to the technical field of quantization noise, and more specifically, to a method and device for reducing quantization noise. Background technique [0002] DAC (Digital to Analog Converter, Digital to Analog Converter) is a device that converts digital signals into analog signals (in the form of current, voltage, or charge). In the process of digital signal conversion by DAC, certain quantization noise will be introduced, so that the final reconstructed analog signal has a certain signal-to-noise ratio, see figure 1 , a flow diagram of a DAC introducing quantization noise disclosed in the prior art. The original digital signal is transformed into an analog signal after being passed through the DAC. At this time, the quantization noise i is added, and after passing through the PA (Power Amplifier, a power amplifier), the reconstructed analog signal is obtained. , the reconstructed analog signal already contains certain quan...

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Problems solved by technology

[0004] However, since it is impossible to adjust the digital gain D and the analog gain A synchronously in practice, the asynchronous switching of the digital gain D and the analog gain A will cause the signal to be discontinuous at the gain switching point, that is, there is a switching error. If the gain switching If the energy near the point is large, there will be very disturbing switching noise, which will affect the auditory quality of the signal

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