KR100745133B1 - Sampling Rate Conversion Method and Sampling Rate Conversion System - Google Patents

Abstract

Sampling rate conversion method that can significantly reduce the amount of calculation during sampling rate conversion by allowing the sampling rates of a plurality of sound sources using one output to have an optimized least common multiple through frequency modification to a sampling rate that satisfies a set condition; and A sampling rate conversion system is disclosed. The sampling rate conversion method includes receiving a plurality of sampling rates, identifying a target sampling rate that is a multiple of a set frequency a among the received sampling rates, and converting the identified target sampling rate into a set frequency b. Transforming to a modified sampling rate that is a multiple, and deriving a conversion factor from the received sampling rate excluding the target sampling rate, and the modified sampling rate.

Description

SAMPLING RATE CONVERSION METHOD AND SAMPLING RATE CONVERSION SYSTEM

1 is a view illustrating a sampling rate conversion process of data according to the present invention, and illustrates an interpolation method.

2 is a diagram illustrating a sampling rate conversion process of data according to the present invention and illustrating a decimation method.

3 is a diagram illustrating a configuration of a sampling rate conversion system according to the present invention.

4 is a flowchart illustrating a sampling rate conversion method of the present invention in detail.

<Explanation of symbols for main parts of the drawings>

300: sampling rate conversion system

310: Initialization means

320: interface means

330: calculation means

340: interpolation means

350: decimation means

According to the present invention, the sampling rate of the sampling rate of a plurality of sound sources using one output is optimized through the frequency variation of the sampling rate satisfying the set condition, thereby significantly reducing the calculation amount during sampling rate conversion. A conversion method and a sampling rate conversion system.

Audio sampling rates include 8,000 Hz, 11,025 Hz, 12,000 Hz, 16,000 Hz, 22,050 Hz, 24,000 Hz, 32,000 Hz, 44,100 Hz, 48,000 Hz, 64,000 Hz, 88,200 Hz, and 96,000 Hz.

In general, in the case of reproducing a plurality of different sound sources through a reproducing apparatus such as a mobile phone, a sound source reproduction method using a plurality of outputs for simultaneously reproducing one sound source and simultaneously reproducing another sound source is commonly used.

If there are a plurality of different sound sources and they need to be played at the same time and there is only one output in the playback device, then an operation on a sound source that allows the sound sources to play with the one output is required.

The operation on the sound source is a process of matching the sampling rates of one sound source and another sound source equally so that a plurality of different sound sources have one output.

However, the conventional operation method of matching the sampling rates of different sound sources to one sampling rate is accompanied by a large amount of calculations, which adds time or effort to the large amount of calculations.

Therefore, there is an urgent need for a new sampling rate conversion model that can solve the problems caused by the conventional operation scheme by devising an operation that can reduce the amount of computation during the custom operation (conversion) of the sampling rate.

The present invention has been made to solve the above problems, in the process of outputting a plurality of playback by a plurality of sound sources to a single output to modify the arbitrary sound source and to reduce the minimum common multiple size of the plurality of sound sources including the modified sound source It is an object of the present invention to provide a sampling rate conversion method and a sampling rate conversion system that can significantly reduce the amount of calculation for sampling rate conversion.

In addition, the present invention takes an integer part of the result value obtained by multiplying an interpolation factor by a value corresponding to a multiplier of 2, and then multiplying the integer part in a sampling rate conversion operation in actual use, thereby interpolating at sampling rate conversion. It is an object of the present invention to provide a sampling rate conversion method and a sampling rate conversion system that omit the division process by factor and remarkably improve the conversion processing speed.

The sampling rate conversion method for achieving the above object comprises the steps of receiving a plurality of sampling rates, identifying a target sampling rate that is a multiple of a set frequency a, among the received sampling rates, and the identified object sampling. Transforming a rate into a modified sampling rate that is a multiple of a set frequency b, deriving a conversion factor from the received sampling rate excluding the target sampling rate, and the modified sampling rate, and the derived conversion factor. And converting the sampling rate based on the sampling rate.

In addition, as a technical configuration for achieving the above object, a sampling rate conversion system includes: a receiving unit for receiving a plurality of sampling rates, an identification unit for identifying a target sampling rate that is a multiple of a set frequency a among the received sampling rates; A transforming unit for transforming the identified target sampling rate into a modified sampling rate that is a multiple of a set frequency b, an induction unit for inducing a conversion factor from the received sampling rate except the target sampling rate, and the modified sampling rate; And initialization means configured to convert a sampling rate based on the derived conversion factor.

Hereinafter, with reference to the accompanying drawings, a sampling rate conversion method and a sampling rate conversion system of the present invention will be described.

1 and 2 are diagrams for explaining a sampling rate conversion process of data according to the present invention. In FIG. 1, an interpolation method is illustrated and a decimation method is illustrated in FIG. 2.

As shown in FIGS. 1 and 2, the sampling rate conversion of the sampled data in this embodiment is performed by the interpolator of FIG. 1 after up-sampling the input data by an integer multiple of m. The low pass filtering of the difference is performed and the decimator of FIG. 2 converts the sampling rate of m / n times by down-sampling the interpolated data by an integer multiple of a predetermined n.

In the interpolation method of FIG. 1, the output Xe [n] up-sampled (↑ L) with respect to the input X [n] sampled with the period T is expressed by Equation 1 below.

The output is scaled by 1 / L with respect to the frequency (ω) in which the original signal is normalized, as shown in FIG. 1, and the interpolate is L with a gain and Cutoff. A low pass filter (LPF) with π / L can be used to obtain an output Xi [n] sampled with a time period T / L.

In the decimation method of FIG. 2, the down-sampled (? M) output Xd [n] with respect to the input X [n] sampled with time peerlead T is as follows.

In this case, in order to avoid aliasing due to down-sampling, the down conversion factor M should be smaller than π / (ωn).

The conversion of the sampling rate according to the present invention consists of m interpolation, L-pass low pass filtering, and n decimation. When the number of input data is assumed to be c, it can be performed by c * m * L multiplication calculations. have.

The structure of the sampling rate conversion system of the present invention for reducing the conversion calculation amount under such a sampling rate conversion method will be described.

3 is a diagram illustrating a configuration of a sampling rate conversion system according to the present invention.

The sampling rate conversion system 300 of the present invention includes an initialization means 310, an interface means 320, an arithmetic means 330, an interpolation means 340, and a decimation means 350. In addition, the initialization unit 310 includes a receiver 311, an identification unit 312, a deformation unit 313, an induction unit 314, and a conversion unit 315.

The receiving unit 311 of the initialization means 310 receives a plurality of sampling rates.

The identification part 312 of the initialization means 310 identifies the target sampling rate which is a multiple of the set frequency a among the received sampling rates. That is, the identification unit 312 selects a sampling rate of a predetermined condition for changing the frequency for optimizing the calculation amount when the intermediate frequency is extracted for a plurality of sampling rates having different sound sources.

In this embodiment, the frequency a is set to '11, 025Hz ', and the identification unit 312 is '11, 025Hz', '22, 050Hz ', '44, 100Hz', which are multiples of the '11, 025Hz 'among the input sampling rates. '… An input sampling rate having a frequency such as' can be selected as the target sampling rate.

The modifying section 313 of the initialization means 310 transforms the identified target sampling rate into a modified sampling rate that is a multiple of the set frequency b. That is, the modifying unit 313 transforms the selected target sampling rate into a modified sampling rate of a specific frequency, which can significantly reduce the amount of calculation when the intermediate frequency is extracted.

In the frequency transformation, the transformation unit 313 may perform a transformation process by determining a frequency closest to the target sampling rate among the set multiples of the frequency b as the modification sampling rate.

In this embodiment, the frequency b is set to '11, 000 Hz ', and the modifying unit 313 sets the selected target sampling rate as '11, 000 Hz', '22, 000 Hz ', and '44, 000, which are multiples of the '11, 000 Hz'. Hz ','… ' Can be determined and replaced by the modified sampling rate.

In the present embodiment, the transformation to the transformation sampling rate by the transformation unit 313 determines the sampling rate after the transformation (or before the transformation) as another value with reference to the sampling rate designated as after the transformation (or before the transformation). Means that.

The derivation unit 314 of the initialization unit 310 derives a conversion factor from the received sampling rate excluding the target sampling rate and the modified sampling rate through a predetermined maximum common factor calculation process.

The conversion factor derived in this embodiment may illustrate an interpolation factor that increases the sampling rate by m times, and a decimation factor that reduces the sampling rate by n times.

For example, the induction unit 314 obtains a maximum common factor between a plurality of sampling rates including the modified sampling rate, and induces a decimation factor by dividing an arbitrary sampling rate (eg, an unmodified input sampling rate) by the maximum common factor. do. In addition, the derivation unit 314 induces an interpolation factor by dividing an arbitrary sampling rate (eg, a modified output sampling rate) by the maximum common factor.

In addition, the induction unit 314 multiplies and sets the inverse of the induced interpolation factor by a predetermined size in a predetermined bit processor to perform an operation of shifting information included in each sampling rate by a predetermined bit when performing the interpolation means.

For example, the induction part 314 may take an integer part of the resultant value obtained by multiplying the derived interpolation factor by the inverse of the interpolation factor in a 24-bit processor by 256 (a value corresponding to a multiplier of 2). Also, the induction part 314 may take an integer part of the resultant value obtained by multiplying the interpolation factor derived by the 32-bit processor by the inverse of the value obtained by multiplying 32,768 (a value corresponding to a multiplier of 2).

Then, the conversion unit 315 of the initialization means 310 converts the sampling rate based on the derived conversion factor.

Accordingly, the initialization means 310 induces and sets a standardized decimation factor or interpolation factor for specific sampling rates, thereby utilizing a small amount of calculation using the factors set during the conversion of the sampling rate for newly input data. You can create an environment that allows for quick conversion processing.

The interface unit 320 serves to receive new data. In other words, the interface means 320 receives new input data from a file, a memory or a stream.

The calculation unit 330 calculates a loop counter by using the quotient of the number of input samples divided by the decimation factor among the conversion factors.

If the number of samples in a predetermined frame is not divided correctly by the decimation factor, the loop counter takes an interpolation until the predetermined number of samples remain and has a value, and the burden of maintaining the value until the next frame is obtained. Since the present invention is intended to limit this, the remaining sample is attached to the front of the next frame to perform decimation. That is, in the utilization of the loop counter, the calculation means 330 adds the remaining input samples not calculated in the preceding frame to the front part of the next frame to be calculated.

In addition, the calculation unit 330 may obtain a frame counter by taking a quotient obtained by dividing the input factor (down) between the input data. If there are remaining input samples not calculated in the previously calculated frame, the number is added to the input number. The remaining input sample is used in the next frame.

In particular, the calculation means 330 utilizes a loop counter so that the number of final samples output from the frame is multiplied by the interpolation factor (up) of the conversion factor.

The interpolation means 340 fills in intermediary data which is linear between the input data. In other words, the interpolation means 340 inserts intermediary data between two input data. Interpolation factor-1 may be filled in between the two data. At this time, the value of the intermediary data to be filled is filled linearly between them based on the values of the two input data.

In addition, the interpolation means 340 multiplies the difference between the two data, the value obtained by multiplying the value of the inverse of the interpolation obtained by the initialization means 310 by a constant value, and shifts by a predetermined bit to calculate the intermediate frequency. That is, the interpolation means 340 multiplies the previously obtained Devided up factor, and shifts 8 or 16 bits to the right, so that the operation can be performed without division. At this time, the obtained data have the value of the intermediate frequency.

The decimation means 350 extracts one of the plurality of samples while maintaining a constant distance to obtain a sample of a desired frequency among the data having an intermediate frequency. That is, the decimation means 350 performs a decimation process and extracts one of the down samples while maintaining a constant distance in order to obtain a sample of a desired frequency from data having an intermediate frequency.

Therefore, according to the present invention, the amount of calculation for sampling rate conversion by modifying an arbitrary sound source and reducing the magnitude of the least common multiple of the plurality of sound sources including the modified sound source in the process of outputting a plurality of playbacks by the plurality of sound sources to one output. Can be significantly reduced.

Hereinafter, an example of the conversion of the sampling rate which drastically reduced the calculation amount according to the present invention will be described.

As described above, the sampling rate conversion system 300 of the present invention can selectively reduce the sampling rate that satisfies a predetermined condition and reduce the amount of calculation according to the conversion by utilizing the modified sampling rate in the sampling rate conversion. have.

For example, the sampling rate conversion system 300 selects a sampling rate of multiples of 11,025 Hz from among a plurality of input sampling rates, and transforms the selected sampling rate to the nearest multiple of 11,000 Hz.

In the following, the difference in conversion calculation amount before and after the sampling rate is compared is illustrated.

If the input sampling rates are 44,100 Hz and 48,000 Hz, the least common multiple of the two frequencies before transformation is 7,056,000 Hz (44,100 * 160, 48,000 * 147).

On the other hand, after the modification of the sampling rate, the sampling rate conversion system 300 selects the sampling rate 44,100 Hz, which is a multiple of 11,025 Hz, as the target sampling rate, and transforms it to 44,000 Hz, which is the nearest multiple of 11,000 Hz. Thereafter, the sampling rate conversion system 300 may calculate the least common multiple of the modified sampling rate 44,000 Hz and the unmodified sampling rate 48,000 Hz at 528,000 Hz (44000 * 12, 48000 * 11).

In other words, the difference between the least common multiples before and after the sampling rate is 6,528,000 (= 7,056,000-528,000), indicating that the minimum common multiples before the deformation are relatively large.

The least common multiple difference before and after such a transformation can be linked to the difference in computation for sampling rate conversion.

At this time, the reproduction time of the sound source is increased by the variation of the sample frequency, but the reproduction of a plurality of sound sources at the same time is used only for a limited time, so it is negligibly short.

For example, when playing a ring tone for a call connection in the middle of listening to music through a mobile phone, the mobile phone needs about 100.227 seconds while playing 100 seconds of the 44,100 Hz sound source in the above example at 44,000 Hz. do. The difference of 0.227 seconds in this 100-second playback time may be negligible, and does not significantly affect the playback quality of the sound source.

In addition, the sampling rate conversion system 300 of the present invention may perform linear interpolation. At this time, the sampling rate conversion system 300 multiplies the value of the inverse of the interpolation factor by 256 (24-bit process) or 32,768 (32-bit processor) in the initialization process to avoid division operation. By multiplying and shifting 8 or 16 bits to the right, we get a division effect. As a result, the division process can be omitted during the conversion of the sampling rate, thereby significantly improving the conversion processing speed. At this time, if multiplied by 256, the data value is shifted to the right by 8 bits, and when multiplied by 32,768, the data value is shifted to the right by 16 bits to correct the output result.

Hereinafter, the conversion of any one sampling rate using the input sampling rate and the output sampling rate will be described.

For convenience of explanation, the case where the sampling rates are 44.1 kHz and 48 kHz will be described by way of example.

In Embodiment 1, the sampling rate conversion system 300 checks whether there is a frequency having a multiple of 11,025 Hz between the sampling rate of the input sound source and the desired output sampling rate, and the multiples of 11,025 Hz (11,025 Hz, 22,050 Hz, If…) is confirmed, it illustrates the transformation to the nearest multiple of 11,000 Hz.

For example, if the input sampling rate is 48 kHz and the output sampling rate is 44.1 kHz, then the sampling rate conversion system 300 checks the output sampling rate 44.1 kHz, which is a multiple of 11,025 Hz, and converts it to 44 kHz, which is a multiple of 11,000 Hz. Estimate. Accordingly, the sampling rate conversion system 300 performs sampling rate conversion between the input sampling rate 48 kHz and the modified output sampling rate 44 kHz, thereby reducing the amount of calculation according to the conversion. At this time, the sampling rate of the actual converted data is not accurate 44.1 kHz, but has a sampling rate having a certain degree of tolerance.

In Embodiment 2, the sampling rate conversion system 300 illustrates inverse deformation with respect to the sampling rate of the input sound source in consideration of the output sampling rate.

For example, if the input sampling rate is 44.1 kHz, and the output sampling rate is 48 kHz, the sampling rate conversion system 300 checks the input sampling rate 44.1 kHz, which is a multiple of 11,025 Hz, and converts it to 44 kHz, which is a multiple of 11,000 Hz. Estimate. Accordingly, the sampling rate conversion system 300 performs a sampling rate conversion between the modified input sampling rate 44 kHz and the output sampling rate 48 kHz, thereby reducing the amount of calculation according to the conversion. At this time, the sampling rate of the actual converted data is not accurate 48kHz, but has a sampling rate having a certain degree of tolerance.

Accordingly, the sampling rate conversion system 300 of the present invention may be capable of modifying a flexible sampling rate within a predetermined error range depending on the system environment with respect to the input or output sampling rate.

Hereinafter, the workflow of the sampling rate conversion system according to the embodiment of the present invention will be described in detail.

4 is a flowchart illustrating a sampling rate conversion method of the present invention in detail.

The sampling rate conversion method of the present invention is performed by the sampling rate conversion system 300 described above.

First, the sampling rate conversion system 300 sets necessary factors (S410). The step S410 is a process of receiving a sampling rate value of an input sound source and receiving a sampling rate value to be output (Set the Argment).

In addition, the sampling rate conversion system 300 performs initialization in relation to the sampling rate conversion (S420). This step S420 is a process of obtaining and setting a conversion factor for use in sampling rate conversion based on specific sampling rates (Initialization).

That is, the sampling rate conversion system 300 in this step S420 is a conversion factor, which is a conversion factor, through a predetermined maximum common factor operation process from the sampling rate of the modified sound source and the sampling rate of the unmodified sound source. Induce factor.

Each factor is divided by 256 on a 24-bit processor and 32,768 on a 32-bit processor to get Devied_up_factor.

Next, the sampling rate conversion system 300 inputs new data (S430). This step S430 is a process of receiving new input data from a file, a memory, and a stream (New sample Read).

In addition, the sampling rate conversion system 300 calculates a loop counter (S440). This step (S440) is a process of obtaining a loop counter (Framesiz_block) by taking a quotient obtained by dividing the number of input data by the Decimation Factor (down) (Calculation Loop count). When the data in a predetermined frame is not divided correctly by the decimation factor and a predetermined number of samples remain, the loop counter performs the next frame by attaching the remaining samples to the front part of the next frame.

Subsequently, the sampling rate conversion system 300 performs interpolation processing (S450). This step (S450) is a process of filling in data as much as "(Interpolation Factor) -1" between the input data (Interpolation). The filling data can be determined to have a linear relationship between the two incoming data. At this time, the size of the data to be filled in can be obtained without multiplication by multiplying the difference between the two data and the Devided_up_factor previously obtained and shifting 8 or 16 bits to the right.

In addition, the sampling rate conversion system 300 performs a decimation process (S460). This step (S460) is a process of extracting one of the down samples while maintaining a constant distance in order to obtain a sample of the desired frequency from the data having an intermediate frequency (Decimation)

Thereafter, the sampling rate conversion system 300 compares and determines whether the number of samples extracted using the loop counter is a positive number of 0 or more (S471). As a result of the determination, when the size of the loop counter is greater than zero (Y direction in S471), the sampling rate conversion system 300 may perform the interpolation processing step (S450) or less. On the other hand, when the determination result, if the size of the loop counter is less than zero (No direction of S471), the sampling rate conversion system 300 performs a predetermined finishing step (S472).

When the new input data is continuously received in the finishing step (S472) (No direction in S472), the sampling rate conversion system 300 may perform the new data input step (S430) or less again. On the other hand, if there is no more data input (Yes direction in S472), the sampling rate conversion system 300 ends the sampling rate conversion process.

Accordingly, according to the present invention, in the process of outputting a plurality of reproductions by a plurality of sound sources to one output, the sampling rate of any sound source is modified and the least common multiple of each sampling rate of the plurality of sound sources including the modified sampling rate of the sound source. By reducing the size of, the computation for sampling rate conversion can be significantly reduced.

Embodiments of the present invention include computer readable media containing program instructions for performing various computer-implemented operations. The computer readable medium may include program instructions, local data files, local data structures, or the like, alone or in combination. The media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical recording media such as CD-ROMs, DVDs, magnetic-optical media such as floppy disks, and ROM, RAM, flash memory, and the like. Hardware devices specifically configured to store and execute the same program instructions are included. The medium may be a transmission medium such as an optical or metal wire, a waveguide, or the like including a carrier wave for transmitting a signal specifying a program command, a local data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

While specific embodiments of the present invention have been described so far, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

As can be seen from the above description, according to the present invention, in the process of outputting a plurality of reproductions by a plurality of sound sources to one output, the sampling rate of an arbitrary sound source is modified and the sampling rate of the modified sound source is included. By reducing the magnitude of the least common multiple of each sampling rate, it is possible to provide a sampling rate conversion method and a sampling rate conversion system that can significantly reduce the amount of calculation for sampling rate conversion.

In addition, according to the present invention, the reciprocal of the interpolation factor is multiplied by a value of a power of 2 of a constant size, and then multiplied by the size in actual use, thereby omitting the division process at the sampling rate conversion and converting process. It is possible to provide a sampling rate conversion method and a sampling rate conversion system that significantly improve the speed.

Claims (21)

In the sampling rate conversion method, Receiving a plurality of sampling rates; Identifying, from the received sampling rate, a target sampling rate that is a multiple of the set frequency a; Transforming the identified target sampling rate to a modified sampling rate that is a multiple of the set frequency b; Deriving a conversion factor from the received sampling rate excluding the target sampling rate, and the transformed sampling rate; And Converting a sampling rate based on the derived conversion factor Sampling rate conversion method comprising a. The method of claim 1, The step of deriving a conversion factor is And the conversion factor is derived from the sampling rate and the transformed sampling rate by a predetermined maximum common factor calculation process. The method of claim 2, The step of deriving a conversion factor is And dividing the sampling rate or the transformed sampling rate by the calculated greatest common factor to derive a decimation factor or an interpolation factor. The method of claim 1, The step of deriving a conversion factor is And taking the inverse of the derived interpolation factor and multiplying information multiplied by a predetermined size in a predetermined bit processor during sample conversion and shifting by a predetermined bit. The method of claim 1, The step of transforming at the modified sampling rate is Determining a frequency closest to the target sampling rate from the multiples of the set frequency b as the modified sampling rate Sampling rate conversion method comprising a. The method of claim 1, Receiving new data; And Obtaining a loop counter using a quotient obtained by dividing the number of input samples by the decimation factor Sampling rate conversion method further comprises. The method of claim 6, The step of obtaining a loop counter, Checking whether data in a predetermined frame is not divided correctly by the decimation factor so that a predetermined number of samples remain; And If the sample remains as a result of the checking, attaching the remaining sample to the front of the next frame and performing decimation on the next frame Sampling rate conversion method comprising a. The method of claim 1, Filling in the mediation data of the conversion factor minus the integer '1' Sampling rate conversion method further comprises. The method of claim 8, The above step of filling in the media data, Filling intermediate data linearly between two input data; And Calculating an intermediate frequency by multiplying the difference between the two data by a reciprocal of the interpolation factor by a predetermined size in a predetermined bit processor and shifting by a predetermined bit Sampling rate conversion method comprising a. The method of claim 1, Extracting one of the plurality of samples while maintaining a constant distance to obtain a sample of a desired frequency among the data having an intermediate frequency Sampling rate conversion method further comprises. The method of claim 1, The frequency a is set to 11,025 Hz, The step of identifying the target sampling rate, the sampling rate conversion method, characterized in that for identifying a predetermined frequency from the multiple of 11,025 Hz as the target sampling rate. The method of claim 1, The frequency b is set to 11,000 Hz, And the transforming at the modified sampling rate comprises determining, as the modified sampling rate, a frequency closest to the target sampling rate among the multiples of 11,000 Hz. In the sampling rate conversion method, Receiving an input sampling rate and an output sampling rate; Checking whether the output sampling rate is a multiple of a set frequency a; If the result of the check is a multiple of frequency a, transforming the output sampling rate into a sampling rate of a multiple of the set frequency b; And Converting a sampling rate using the input sampling rate and the modified output sampling rate Sampling rate conversion method comprising a. In the sampling rate conversion method, Receiving an input sampling rate and an output sampling rate; Checking whether the input sampling rate is a multiple of a set frequency a; If the result of the check is a multiple of frequency a, transforming the input sampling rate into a sampling rate of a multiple of the set frequency b; And Converting a sampling rate using the modified input sampling rate and the output sampling rate Sampling rate conversion method comprising a. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 1 to 14. In the sampling rate conversion system, A receiver for receiving a plurality of sampling rates; An identification unit for identifying a target sampling rate that is a multiple of the set frequency a among the received sampling rates; A deformation unit for transforming the identified target sampling rate into a modified sampling rate that is a multiple of a set frequency b; A derivation unit for deriving a conversion factor from the received sampling rate except the target sampling rate and the modified sampling rate; And A converter for converting a sampling rate based on the derived conversion factor Sampling rate conversion system comprising an initialization means configured to include. The method of claim 16, Interface means for receiving new data; And Calculation means for obtaining a loop counter using a quotient obtained by dividing the number of input samples by the decimation factor Sampling rate conversion system further comprises. The method of claim 16, Interpolation that fills media data linearly between two input data and multiplies the difference between the two data by multiplying the inverse of the interpolation factor by a predetermined size in a predetermined bit processor and shifting by a predetermined bit to calculate an intermediate frequency. Way Sampling rate conversion system further comprises. The method of claim 16, Decimation means for extracting one of a plurality of samples while maintaining a constant distance to obtain a sample of a desired frequency among the data having an intermediate frequency Sampling rate conversion system further comprises. In the sampling rate conversion system, A receiver for receiving an input sampling rate and an output sampling rate; An identification unit for checking whether the output sampling rate is a multiple of a set frequency a; A deformation unit for transforming the output sampling rate into a sampling rate of a multiple of the set frequency b, when it is a multiple of the frequency a; And A converter for converting a sampling rate using the input sampling rate and the modified output sampling rate Sampling rate conversion system comprising an initialization means configured to include. In the sampling rate conversion system, A receiver for receiving an input sampling rate and an output sampling rate; An identification unit for checking whether the input sampling rate is a multiple of a set frequency a; A deformation unit for transforming the input sampling rate into a sampling rate of a multiple of the set frequency b when the checking result is a multiple of the frequency a; And A converter for converting a sampling rate using the modified input sampling rate and the output sampling rate Sampling rate conversion system comprising an initialization means configured to include.

Images