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Multi-channel comb filter

A comb filter and multi-channel technology, applied in the direction of impedance network, digital technology network, electrical components, etc., can solve the problems of speed reduction and area increase of the adder, and achieve the goal of increasing the operating frequency, saving costs, and optimizing the structure Effect

Active Publication Date: 2013-04-24
SHANGHAI BEILING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For traditional comb filters, two adders will be added for each order increase, and in order to maintain accuracy, the corresponding data bit width will also increase, the speed of the adder will decrease, and the area will also increase

Method used

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with accompanying drawing.

[0027] The advantages of the comb filter are: no multiplier is required; no memory is required for filter coefficients; no external timing control is required for structural rules. The disadvantage is that the passband performance is attenuated, and filter compensation needs to be added in the subsequent stage.

[0028] The transfer function of the comb filter is:

[0029] Wherein, M is the number of taps of the comb filter, and M is an integer; is the integrator; 1-Z -M is the comb; Z -M Indicates the delay unit, which means M times of delay.

[0030] In order to improve the stopband attenuation of the comb filter and reduce the passband attenuation, the transfer function of the comb filter is modified as:

[0031] Wherein, N is the order of the comb filter, and N is a positive integer.

[0032] see figure 2 , is a schematic structural diagram of a traditional...

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Abstract

The invention discloses a multi-channel comb filter. By decomposition of comb filter transfer function, architecture of the comb filter is optimized. The comb filter is decomposed as a comb filter which is in a multi-phase parallel structure, and by utilization of a shifting register and a random access memory (RAM), a complex comb filter shares an integrator, a comb-shaped device and an adder-subtractor with the multi-channel comb filter. Therefore, on the basis that an area and complexity are not increased, the high-speed multi-channel comb filter is achieved, hardware resource consumption is reduced, cost is saved, working frequency is reduced before the operation of addition and subtraction, and thus the whole working frequency of the comb filter is improved and the multi-channel comb filter is suitable for a next mobile communication system.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a multi-channel comb filter. Background technique [0002] Technology is changing with each passing day. Due to the rapid development of digital systems, most modern equipment today uses digital systems for signal processing. Analog signals need to be converted into digital signals by analog-to-digital converters (ADCs) before they can be processed and stored in digital systems. With the development of mobile communication technology, the number of communication users has increased dramatically. Modern communication protocols have adopted high-speed multi-carrier processing technology, which requires corresponding communication products to also have high-speed multi-carrier processing capabilities. [0003] Digital filters are widely used in various communication systems such as HDTV, smartphones, cable modulation, etc. In oversampling ΣΔ ADC applications with...

Claims

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Application Information

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IPC IPC(8): H03H17/02
Inventor 潘科韩明
Owner SHANGHAI BEILING
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