PURPOSE: To reduce a quantization error by performing coding by applying non-linear quantization on differential data of (m) bits except for the most significant bit of the differential data, and setting the data of (m) bits except for the most significant bit of the data obtained by an addition processing as recovery data.
CONSTITUTION: A digital signal of (m) bits inputted from a terminal 10 is inputted to an amplitude limitation circuit 20, and amplitude limitation is performed so that it stays within a prescribed level. Here, an amplitude-limited signal is inputted to a difference detection circuit 30, and a difference is found at every sampling value with a prescribed interval. A code bit is attached on a differential signal level, then, it goes the one of (m+1) bits, however, bit compression to (n) bits is performed by inputting the differential signal of (m) bits except for the most significant bit to a non-linear quantization circuit 40. A bit-compressed signal is inputted to a representative value setting circuit 60 via a transmission path 50, then, it is expanded to the differential signal of (m) bits. An expanded deferential signal is inputted to an adder circuit 70, and addition at every prescribed interval corresponding to the detection circuit 30 is performed, and it is recovered to an original signal, then, is outputted from a terminal 80. Thus, the quantization error can be reduced.
| WO/2011/077628 | IMAGE ENCODING METHOD, IMAGE ENCODING DEVICE AND IMAGING SYSTEM |
| WO/2016/119666 | IMAGE CODING/DECODING METHOD AND APPARATUS |
| JP3515343 | TELEVISION BROADCASTING RECEIVER |
OTSUBO HIROYASU
SEKIYA MASATAKA
MITSUBE AKISHI
NISHIJIMA HIDEO
MASUDA MICHIO
| JPS62252288A | 1987-11-04 |
| DE2405534A1 | 1975-08-14 |