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Sample rate converter

A technology of sampling rate and conversion method, applied in the direction of digital transmission system, synchronous signal speed/phase control, electrical components, etc., can solve problems such as problems

Inactive Publication Date: 2003-10-29
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using a precomputed table is that the values ​​used for the table must be precomputed and stored, which requires additional hardware resources
This approach is particularly problematic when the same converter is used for multiple combinations of input and output sample rates

Method used

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Embodiment Construction

[0024] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which a preferred embodiment is shown. However, the present invention can be used in many different embodiments and is not limited to the embodiments described herein.

[0025] The method of the present invention is a variant of interpolation in which an integer accumulator 220 is used to calculate the relative position in time of the input and output samples. For linear interpolation, this method uses two positive integer constants A and B to calculate the timing relationship between two input samples and one output sample. If the sampling period of the input signal is T x , and the sampling period of the output signal is T y , then select A and B such that A and B satisfy the following equation:

[0026] A / B=T x / T y The actual values ​​or sizes of A and B depend on the level of precision desired, among other considerations. In the implementation, the i...

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Abstract

A sampling rate converter (200) for converting an input data stream comprising a plurality of input samples (X) according to a certain sampling rate to an output comprising a plurality of output samples (Y) according to another sampling rate data flow. The converter utilizes interpolation, ie an integer accumulator (220), to track the timing relationship between the input samples and the output samples. The method judges whether the correct input sample is used to calculate the current output sample according to the value of the accumulator. If "yes", the output samples are computed as a function of the input samples and the accumulator value. The converter makes table-based conversion methods robust without the need to pre-compute and store tables, simplifying the computations involved, and being less susceptible to numerical round-off errors.

Description

field of invention [0001] The invention relates to field sampling rate conversion of digital signals. In particular, the invention relates to sample rate conversion methods employing integer accumulators to compute the timing relationship of input and output samples. Background of the invention [0002] In many electronic applications, signals are represented and processed digitally. Numeric words, or samples, representing data values ​​at equal time intervals. This equal time interval is often referred to as the sampling rate, and is usually expressed in units of kilohertz (kHz), which represents the reciprocal of the sampling time interval. [0003] Sometimes there are cases where the available data sampling rate is different from the expected sampling rate. Depending on the characteristics of the sample data and the difference between the available and desired sampling rates, several methods can be used to convert a signal according to one sampling rate to a signal acc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/04H04B14/04H03H17/06H04L7/00
CPCH03H17/0621H04L7/04
Inventor P·B·霍姆奎斯特
Owner TELEFON AB LM ERICSSON (PUBL)