Patents by Inventor Michiyo Goto

Michiyo Goto has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20090055169
    Abstract: A voice encoding device capable of generating a modulated proper monaural signal enriched in clearness and understandability, when the monaural signal is to be generated from a stereophonic signal. In this device, a weighting unit (11) weights an L-channel signal (XL) and an R-channel signal (XR) individually, and inputs the weighted L-channel signal (XLW) and R-channel signal (XRW) to a monaural signal generating unit (12). This monaural signal generating unit (12) averages the L-channel signal (XLW) and the R-channel signal (XRW), and creates and inputs a monaural signal (XMW) to a monaural signal encoding unit (13). This monaural signal encoding unit (13) encodes the monaural signal (XMW), and outputs an encoding parameter of the monaural signal (XMW) (or a monaural signal encoding parameter).
    Type: Application
    Filed: January 25, 2006
    Publication date: February 26, 2009
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Michiyo Goto, Koji Yoshida
  • Publication number: 20090041255
    Abstract: There is disclosed a scalable encoding device capable of preventing sound quality deterioration of a decoded signal, reducing the encoding rate, and reducing the circuit size. The scalable encoding device includes: a first layer encoder (100) for generating a monaural signal by using a plurality of channel signals (L channel signal and R channel signal) constituting a stereo signal and encoding the monaural signal to generate a sound source parameter; and a second layer encoder (150) for generating a first conversion signal by using the channel signal and the monaural signal, generating a synthesis signal by using the sound source parameter and the first conversion signal, and generating a second conversion coefficient index by using the synthesis signal and the first conversion signal.
    Type: Application
    Filed: January 30, 2006
    Publication date: February 12, 2009
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Michiyo Goto, Koji Yoshida
  • Publication number: 20090043572
    Abstract: A pulse allocating method capable of coding stereophonic voice signals efficiently. In the fixed code note retrievals (ST21 to ST25) of this pulse allocating method, for individual subframes, the stereophonic voice signals are compared (ST21) to judge similarity between channels, and are judged (ST22) on their characteristics. On the basis of the similarity between the channels and the characteristics of the stereophonic signals, the pulse numbers to be allocated to the individual channels are determined (ST23). Pulse retrievals are executed (ST24) to determine the pulse positions for the individual channels, so that the pulses determined at ST24 are coded (ST25).
    Type: Application
    Filed: February 9, 2006
    Publication date: February 12, 2009
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Chun Woei Teo, Sua Hong Neo, Koji Yoshida, Michiyo Goto
  • Publication number: 20080255832
    Abstract: A scalable encoding apparatus wherein stereo audio signals can be scalable encoded by use of a CELP encoding to improve the encoding efficiency. In the apparatus, an adder and a multiplier obtain an average of first and second channel signals as a monophonic signal. A CELP encoding part performs a CELP encoding of the monophonic signal. A first channel difference information encoding part performs an encoding of the first channel signal in conformance with the CELP encoding and obtains a difference between a resulting encoded parameter and an encoded parameter outputted from the CELP encoding part. The first channel difference information encoding part then encodes this difference and outputs the resulting encoded parameter.
    Type: Application
    Filed: September 26, 2005
    Publication date: October 16, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Michiyo Goto, Koji Yoshida
  • Publication number: 20080255833
    Abstract: A scalable encoding device for realizing scalable encoding by CELP encoding of a stereo sound signal and improving the encoding efficiency. In this device, an adder and a multiplier obtain an average of a first channel signal CH1 and a second channel signal CH2 as a monaural signal M. A CELP encoder for a monaural signal subjects the monaural signal M to CELP encoding, outputs the obtained encoded parameter to outside, and outputs a synthesized monaural signal M? synthesized by using the encoded parameter to a first channel signal encoder. By using the synthesized monaural signal M? and the second channel signal CH2, the first channel signal encoder subjects the first channel signal CH1 to CELP encoding to minimize the sum of the encoding distortion of the first channel signal CH1 and the encoding distortion of the second channel signal CH2.
    Type: Application
    Filed: September 28, 2005
    Publication date: October 16, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Michiyo Goto, Koji Yoshida, Hiroyuki Ehara, Masahiro Oshikiri
  • Publication number: 20080177533
    Abstract: A spectrum modifying method and the like wherein the efficiencies of the signal estimation and prediction can be improved and the spectrum can be more efficiently encoded. According to this method, the pitch period is calculated from an original signal, which serves as a reference signal, and then a basic pitch frequency (f0) is calculated. Thereafter, the spectrum of a target signal, which is a target of spectrum modification, is divided into a plurality of partitions. It is specified here that the width of each partition be the basic pitch frequency. Then, the spectra of bands are interleaved such that a plurality of peaks having similar amplitudes are unified into a group. The basic pitch frequency is used as an interleave pitch.
    Type: Application
    Filed: May 11, 2006
    Publication date: July 24, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Chun Woei Teo, Sua Hong Neo, Koji Yoshida, Michiyo Goto
  • Publication number: 20080162148
    Abstract: A scalable encoding apparatus wherein the degradation of sound quality of a decoded signal can be prevented, while the encoding rate and the circuit scale can be reduced. In this apparatus, an L-channel signal processing part (105-1) uses L-channel space information to generate an L-channel signal (L1) to produce a processed signal (L2) that is similar to a monophonic signal (M1). An L-channel processed signal combining part (106-1) uses both the processed signal (L2) and a sound source signal (S1) generated by a sound source signal generating part (104) to generate a combined signal (L3). An R-channel signal processing part (105-2) and an R-channel processed signal combining part (106-2) operate similarly. A distortion minimizing part (103) controls the sound source signal generating part (104) to generate such a common sound source signal (S1) that the sum of the encoding distortions of combined signals (M2,L3,R3) is minimized.
    Type: Application
    Filed: December 26, 2005
    Publication date: July 3, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Michiyo Goto, Koji Yoshida
  • Publication number: 20080154583
    Abstract: A stereo signal generating apparatus capable of obtaining stereo signals that exhibit a low bit rate and an excellent reproducibility. In this stereo signal generating apparatus (90), an FT part (901) converts a monaural signal (M?t) of time domain to a monaural signal (M?) of frequency domain. A power spectrum calculating part (902) determines a power spectrum (PM?). A scaling ratio calculating part (904a) determines a scaling ratio (SL) for a left channel, while a scaling ratio calculating part (904b) determines a scaling ratio (SR) for a right channel. A multiplying part (905a) multiplies the monaural signal (M?) of frequency domain by the scaling ratio (SL) to produce a left channel signal (L?) of a stereo signal, while a multiplying part (905b) multiplies themonaural signal (M?)of frequency domain by the scaling ratio (SR) to produce a right channel signal (R?) of the stereo signal.
    Type: Application
    Filed: August 29, 2005
    Publication date: June 26, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Michiyo Goto, Chun Woei Teo, Sua Hong Neo, Koji Yoshida
  • Publication number: 20080091419
    Abstract: There is provided an audio encoding device capable of generating an appropriate monaural signal from a stereo signal while suppressing the lowering of encoding efficiency of the monaural signal. In a monaural signal generation unit (101) of this device, an inter-channel prediction/analysis unit (201) obtains a prediction parameter based on a delay difference and an amplitude ratio between a first channel audio signal and a second channel audio signal; an intermediate prediction parameter generation unit (202) obtains an intermediate parameter of the prediction parameter (called intermediate prediction parameter) so that the monaural signal generated finally is an intermediate signal of the first channel audio signal and the second channel audio signal; and a monaural signal calculation unit (203) calculates a monaural signal by using the intermediate prediction parameter.
    Type: Application
    Filed: December 26, 2005
    Publication date: April 17, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Koji Yoshida, Michiyo Goto
  • Publication number: 20080010072
    Abstract: A sound coding device having a monaural/stereo scalable structure and capable of efficiently coding stereo sound. even when the correlation between the channel signals of a stereo signal is small. In a core layer coding block (110) of this device, a monaural signal generating section (111) generates a monaural signal from first and second-channel sound signal, a monaural signal coding section (112) codes the monaural signal, and a monaural signal decoding section (113) greatest a monaural decoded signal from monaural signal coded data and outputs it to an expansion layer coding block (120).
    Type: Application
    Filed: December 26, 2005
    Publication date: January 10, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Koji Yoshida, Michiyo Goto
  • Publication number: 20070233470
    Abstract: Multichannel signal coding equipment is provided for presenting a high quality sound at a low bit rate. In the multichannel signal coding equipment (2), a down mixpart (10) generates monaural reference channel signals for N number of channel signals. A coding part (11) codes the generated reference channel signal. A signal analyzing part (12) extracts parameters indicating characteristics of each of the N number of channel signals. An MUX part (13) multiplexes the coded reference channel signal with the extracted parameters.
    Type: Application
    Filed: August 24, 2005
    Publication date: October 4, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Michiyo Goto, Chun Teo, Sua Neo, Koji Yoshida
  • Publication number: 20070198254
    Abstract: The conventional error conceal processing generates a greatly fluctuating irregular sound which is unpleasant to ears and causes a remarkable echo effect and click noise. A notification signal detection unit (301) judges processing for an input frame. In case of an error frame, a sound detection unit (303) makes judgment whether a preceding non-error data frame is a sound signal. If it is a sound frame, a sound copying unit (304) generates a replacing frame. If it is a non-sound frame, a transient signal detection unit (305) judges whether it is an attack signal by the transient signal detection and selects an appropriate area from the preceding non-error frame.
    Type: Application
    Filed: March 1, 2005
    Publication date: August 23, 2007
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Michiyo Goto, Chun Teo, Sua Neo, Koji Yoshida
  • Publication number: 20070025237
    Abstract: A packet communication apparatus that allows the user of the communication terminal performing packet communication to take countermeasures when packet loss occurs, such as, moving to a more satisfactory communication environment is provided. A mark M3 indicating packet loss are displayed on the display screen 119 of the apparatus in addition to marks M1 and M2 indicating the received power and the remaining amount of the battery, respectively. The packet loss is notified to the user by changing the expression of a face of the mark M3 according to the extent of the packet loss. That is, when the mark M3 has a smiling face, a state in which the packet loss is not occurring is indicated, when the mark M3 has a normal face, a state in which the packet loss has occurred but has substantially no practical problems as the packet is compensated is indicated, and when the mark M3 has a crying face, a state in which the packet loss has occurred and deteriorating of data is significant is indicated.
    Type: Application
    Filed: August 20, 2004
    Publication date: February 1, 2007
    Inventor: Michiyo Goto
  • Patent number: 6295009
    Abstract: In a method and apparatus for encoding a digital audio signal to transmit the signal as an encoded bitstream formatted as a series of frames, and a corresponding method and apparatus for decoding the encoded bitstream, with audio data being conveyed in each frame as a set of quantized samples which have each been quantized using a calculated scale factor and a number of allocated bits which is specified by bit allocation information that is calculated based on the scale factors, the bit allocation information generated in the encoding process is omitted from each frame of the encoded bitstream, and is again generated in the decoding process by using the received decoded scale factors.
    Type: Grant
    Filed: September 13, 1999
    Date of Patent: September 25, 2001
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Michiyo Goto
  • Patent number: 5353375
    Abstract: Disclosed is an invention concerning a quantization bit number allocating section for sub-band coding, wherein data important for human auditory sense are efficiently coded within a limited coding bit capacity to provide a high-quality digital audio signal. The quantization bit number allocating section comprises a level calculating section, a logarithm calculating section, an index calculating section, a quantization bit number calculating section, a logarithm weighting table, and a sub-band weighting table, wherein the quantization bit number is determined every prescribed time according to human auditory sense and the characteristic of an input digital audio signal.
    Type: Grant
    Filed: July 30, 1992
    Date of Patent: October 4, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Michiyo Goto, Yoshinori Matsui
  • Patent number: 4882758
    Abstract: A high speed method for formant extraction includes the steps of calculating linear prediction coefficients by executing linear prediction analysis of an input speech signal, extracting a coarse formant frequency by making a linear combination of multiple regression coefficients obtained through multiple regression analysis executed with speech feature parameters taken as predictor variables and with formant frequencies taken as criterion variables and speech feature parameters, and solving a root of an inverse filter formed of the linear prediction coefficients by an approximation method in which the coarse formant frequency is set up as an initial value of the root of the inverse filter and an approximation of root is recursively calculated until it converges to the root.
    Type: Grant
    Filed: October 22, 1987
    Date of Patent: November 21, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yutaka Uekawa, Shuji Takata, Michiyo Goto