公开(公告)号：ZA201307316B

公开(公告)日：2014-12-23

申请号：ZA201307316

申请日：2013-10-01

Applicant: PANASONIC IP CORP AMERICA

Inventor： LIU ZONGXIAN ,  CHONG KOK SENG ,  OSHIKIRI MASAHIRO

IPC: G10L20060101

Abstract: In this invention, the design of the Huffman table can be done offline with a large input sequence database. The range of the quantization indices (or differential indices) for Huffman coding is identified. For each value of range, all the input signal which have the same range will be gathered and the probability distribution of each value of the quantization indices (or differential indices) within the range is calculated. For each value of range, one Huffman table is designed according to the probability. And in order to improve the bits efficiency of the Huffman coding, apparatus and methods to reduce the range of the quantization indices (or differential indices) are also introduced.

公开(公告)号：ZA201200919B

公开(公告)日：2013-07-31

申请号：ZA201200919

申请日：2012-02-07

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  ZHOU HUAN ,  ZHONG HAISHAN ,  NORIMATSU TAKESHI ,  CHONG KOK SENG

IPC: G01L20060101 ,  G10L21/038 ,  G10L21/04

Abstract: To provide a bandwidth extension method which allows reduction of computation amount in bandwidth extension and suppression of deterioration of quality in the bandwidth to be extended. In the bandwidth extension method: a low frequency bandwidth signal is transformed into a QMF domain to generate a first low frequency QMF spectrum (S11); pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal (S12); a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain (S13); the high frequency QMF spectrum is modified (S14); and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum (S15).

公开(公告)号：EP2381439A4

公开(公告)日：2016-06-29

申请号：EP10733364

申请日：2010-01-21

Applicant: PANASONIC IP CORP AMERICA

Inventor： LIU ZONGXIAN ,  CHONG KOK SENG

IPC: G10L19/008 ,  H04S1/00

CPC classification number: G10L19/008

Abstract: Disclosed is a stereo acoustic signal encoding apparatus in which the signal quality does not deteriorate if there are a plurality of sound sources. A peak tracing unit (401) splits frames of a right channel signal and a left channel signal into a plurality of sub frames; detects the peaks of wave shapes of the split sub frames; and estimates a frame delay time D for each frame of the right channel signal and the left channel signal by comparing the positions of the detected peaks. A time adjusting unit (402) adjusts the time of the right channel signal on the basis of the frame time delay D. A down-mix operation is carried out using the right channel signal which has been subjected to the time adjustment and the left channel signal to generate a mono signal and a sub signal. A mono signal encoding unit (403) encodes the mono signal. A sub signal encoding unit (404) encodes the sub signal. The time delay encoding unit (405) encodes the frame time delay D.

公开(公告)号：EP2770754A4

公开(公告)日：2015-04-15

申请号：EP12841137

申请日：2012-10-18

Applicant: PANASONIC IP CORP AMERICA

Inventor： NORIMATSU TAKESHI ,  CHONG KOK SENG ,  TEE LIH HORNG

IPC: H04S1/00 ,  H04R1/40 ,  H04R3/00 ,  H04S5/02

CPC classification number: H04S7/00 ,  H04R1/403 ,  H04R2201/401 ,  H04R2499/15 ,  H04S1/002 ,  H04S7/305 ,  H04S2420/13

公开(公告)号：EP2581905A4

公开(公告)日：2014-11-05

申请号：EP11792129

申请日：2011-06-06

Applicant: PANASONIC IP CORP AMERICA

Inventor： ISHIKAWA TOMOKAZU ,  NORIMATSU TAKESHI ,  ZHOU HUAN ,  CHONG KOK SENG ,  ZHONG HAISHAN

IPC: G10L21/038 ,  G10L21/04

CPC classification number: G10L19/02 ,  G10L21/038 ,  G10L21/04

Abstract: To provide a bandwidth extension method which allows reduction of computation amount in bandwidth extension and suppression of deterioration of quality in the bandwidth to be extended. In the bandwidth extension method: a low frequency bandwidth signal is transformed into a QMF domain to generate a first low frequency QMF spectrum (S11); pitch-shifted signals are generated by applying different shifting factors on the low frequency bandwidth signal (S12); a high frequency QMF spectrum is generated by time-stretching the pitch-shifted signals in the QMF domain (S13); the high frequency QMF spectrum is modified (S14); and the modified high frequency QMF spectrum is combined with the first low frequency QMF spectrum (S15).