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Comb filter

A technology of comb filter and integrator, which is applied in the direction of impedance network, digital technology network, electrical components, etc., and can solve the problems of data word width enlargement and low-pass characteristics, etc.

Inactive Publication Date: 2003-10-29
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The filter function of such an attenuation filter usually has a low-pass characteristic and leads to an increase in the word width of the data attenuated by the attenuation filter

Method used

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Embodiment Construction

[0028] Figure 2 has been explained above. In FIG. 1 the same symbols as in FIG. 2 are used for corresponding parts.

[0029] In FIG. 1 the three integrators I1 , I2 , I3 and the summers as in FIG. 2 are arranged in a chain, where the word width m1 , m2 or m3 can be adapted to the integrators I1 , I2 and I3 . Different from the existing comb filter as shown in FIG. 2, in the comb filter according to the present invention, an 8-bit word-wide counter is connected in series behind the integrator I1, and the counter counts the reset of the data bits in the integrator. The counting result thus obtained in the counter is then input to the third integrator I3 most significant bit at reset, which is simultaneously used as a differentiator, while the low value bit of the third integrator is reset in the usual manner. All delay elements are reset, no selective reset is designed.

[0030] The horizontal superposition stage PS consisting of the subtractor Su and the integrator I is recon...

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Abstract

The invention relates to a comb filter consisting of series-connected integrators (I1, I2, I3) for providing a digital data stream at a low scanning frequency, which inputs digital data at a high scanning frequency flow. The most significant bit of the digital data stream is reset in the first and second integrator (I1, I2), where the reset of the data bit in the first integrator (I) is stored in a counter (Z). The counting result of the counter (Z) is input to the highest value bit of the final integrator (I3) when it is reset.

Description

technical field [0001] The invention relates to a comb filter consisting of series integrating circuits for supplying a low scanning frequency digital data stream fed by a higher scanning frequency digital data stream. Background technique [0002] So-called attenuation filters are used to convert the digital data stream with a higher scanning frequency into a data stream with a lower scanning frequency. The filter function of such an attenuation filter generally has a low-pass characteristic and results in an increased word width of the data attenuated by the attenuation filter. Thus higher frequency 1-bit streams are attenuated to e.g. 16-bit words in the speech band [0003] Among the application areas is digital telephony. Here at least one such attenuation filter is connected in series downstream of the sigma-delta analog / digital converter. [0004] Usually the attenuation factor of the attenuation filter is determined by various powers of two, that is to say 2, 4, 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/04H03H17/02H03H17/00
CPCH03H17/0251H03H17/0416H03H17/045
Inventor D·德拉克瑟马尔
Owner INFINEON TECH AG