# US 10,312,935 B2 · Digital data compression and decompression device

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- Number: US 10,312,935 B2
- Document ID: US10312935B2
- Status: Granted
- Kind: B2
- Application number: 15/757,590
- Filed: 2016-03-07
- Published: 2018-09-13
- Granted: 2019-06-04
- Earliest claimed: 2015-09-03
- Assignees: SOLiD, INC.
- Applicants: SOLiD, INC.
- Inventors: Hee Cheol Yun; Seung Rog Choi; Sun Keun Yu; Tae Hyeong Kim
- Web page: https://patentgrep.com/patent/US10312935B2

## CPC

- H03M 7/30: Compression (speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N); Expansion; Suppression of unnecessary data, e.g. redundancy reduction
- H03M 7/70: {Type of the data to be coded, other than image and sound}
- H04B 10/516: Details of coding or modulation
- H04L 1/0013: {Rate matching, e.g. puncturing or repetition of code symbols}
- H04L 27/2634: {Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation}
- H04B 10/2575: Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04L 1/0014: {by adapting the source coding}
- H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

There is provided a digital data compression device including a domain converter configured to perform frequency domain conversion on input digital I/Q data and output coefficient data corresponding to the digital I/Q data; a data converter configured to receive the coefficient data output from the domain converter and convert the input coefficient data of Cartesian coordinates into coefficient data of polar coordinates; and a quantizer configured to quantize the coefficient data of the polar coordinates output from the data converter.

## Claims

### Claim 1

A digital data compression device comprising:
a signal rate adjuster configured to output adjusted digital I/Q data by adjusting a signal rate of input digital I/Q data;
a domain converter configured to perform frequency domain conversion on the adjusted digital I/Q data and output coefficient data corresponding to the adjusted digital I/Q data;
a data converter configured to receive the coefficient data output from the domain converter, and convert the received coefficient data from coefficient data of Cartesian coordinates into coefficient data of polar coordinates; and
a quantizer configured to quantize the coefficient data of the polar coordinates output from the data converter.

### Claim 2 (depends on 1)

The digital data compression device of claim 1, wherein the domain converter is implemented by a fast fourier transform (FFT) block, and the coefficient data is an FFT coefficient by the FFT block.

### Claim 3 (depends on 1)

The digital data compression device of claim 1, wherein the quantizer is configured to generate a quantization value by performing a linear quantization operation of a fixed point on angle component data among coefficient data output from the data converter, and
generate a quantization value by performing a floating point quantization operation on magnitude component data among coefficient data output from the data converter.

### Claim 4

A digital data decompression device comprising:
a dequantizer configured to perform dequantization on coefficient data of polar coordinates input with quantization;
a data converter configured to receive coefficient data of polar coordinates output from the dequantizer, and convert the coefficient data of the polar coordinates into coefficient data of Cartesian coordinates; and
a domain inverse converter configured to receive coefficient data of Cartesian coordinates output from the data converter, and perform frequency domain inverse conversion on the coefficient data to output digital I/Q data in a time domain,
a signal rate adjuster configured to adjust a signal rate of the digital I/Q data output from the domain inverse converter.

### Claim 5 (depends on 4)

The digital data decompression device of claim 4, wherein the domain inverse converter is implemented as an inverse FFT (IFFT) block.