Patents by Inventor Kazunaga Ikeda
Kazunaga Ikeda 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).
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Patent number: 8311815Abstract: A down sampler 13 down samples a digital signal in the sampling frequency thereof from 96 kHz to 48 kHz on a frame-by-frame basis. The converted signal is compression encoded and output as a main code Im. An up sampler 16 converts a partial signal corresponding to the main code Im to a signal having the original sampling frequency 96 kHz, for example. An error signal between the up sampled signal and an input digital signal is generated. An array converting and encoding unit 18 array converts bits of sample chains of the error signal, thereby outputting an error code Pe. On a decoding side, a high fidelity reproduced signal is obtained based on the main code Im and the error code Pe, or a reproduced signal is obtained based on the main code Im only.Type: GrantFiled: July 14, 2009Date of Patent: November 13, 2012Assignee: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Akio Jin, Kazunaga Ikeda, Takeshi Mori
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Publication number: 20090279598Abstract: A down sampler 13 down samples a digital signal in the sampling frequency thereof from 96 kHz to 48 kHz on a frame-by-frame basis. The converted signal is compression encoded and output as a main code Im. An up sampler 16 converts a partial signal corresponding to the main code Im to a signal having the original sampling frequency 96 kHz, for example. An error signal between the up sampled signal and an input digital signal is generated. An array converting and encoding unit 18 array converts bits of sample chains of the error signal, thereby outputting an error code Pe. On a decoding side, a high fidelity reproduced signal is obtained based on the main code Im and the error code Pe, or a reproduced signal is obtained based on the main code Im only.Type: ApplicationFiled: July 14, 2009Publication date: November 12, 2009Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.Inventors: Takehiro Moriya, Akio Jin, Kazunaga Ikeda, Takeshi Mori
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Patent number: 7599835Abstract: A down sampler 13 down samples a digital signal in the sampling frequency thereof from 96 kHz to 48 kHz on a frame-by-frame basis. The converted signal is compression encoded and output as a main code Im. An up sampler 16 converts a partial signal corresponding to the main code Im to a signal having the original sampling frequency 96 kHz, for example. An error signal between the up sampled signal and an input digital signal is generated. An array converting and encoding unit 18 array converts bits of sample chains of the error signal, thereby outputting an error code Pe. On a decoding side, a high fidelity reproduced signal is obtained based on the main code Im and the error code Pe, or a reproduced signal is obtained based on the main code Im only.Type: GrantFiled: March 10, 2003Date of Patent: October 6, 2009Assignee: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Akio Jin, Kazunaga Ikeda, Takeshi Mori
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Patent number: 7337112Abstract: At the coder side, bits of samples of each frame of an input digital signal are concatenated every digit common to the samples across each frame to generate equi-order bit sequences, which are output as packets. At the decoding side, the input equi-order sequences are arranged inversely to their arrangement at the coder side to reconstruct sample sequences. When a packet dropout occurs, a missing information compensating part 430 correct the reconstructed sample sequences in a manner to reduce an error between the spectral envelope of the reconstructed sample sequence concerned and a known spectral envelope.Type: GrantFiled: December 14, 2006Date of Patent: February 26, 2008Assignee: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Akio Jin, Takeshi Mori, Kazunaga Ikeda
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Publication number: 20070083362Abstract: At the coder side, bits of samples of each frame of an input digital signal are concatenated every digit common to the samples across each frame to generate equi-order bit sequences, which are output as packets. At the decoding side, the input equi-order sequences are arranged inversely to their arrangement at the coder side to reconstruct sample sequences. When a packet dropout occurs, a missing information compensating part 430 correct the reconstructed sample sequences in a manner to reduce an error between the spectral envelope of the reconstructed sample sequence concerned and a known spectral envelope.Type: ApplicationFiled: December 14, 2006Publication date: April 12, 2007Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.Inventors: Takehiro MORIYA, Akio Jin, Takeshi Mori, Kazunaga Ikeda
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Patent number: 7200561Abstract: At the coder side, bits of samples of each frame of an input digital signal are concatenated every digit common to the samples across each frame to generate equi-order bit sequences, which are output as packets. At the decoding side, the input equi-order sequences are arranged inversely to their arrangement at the coder side to reconstruct sample sequences. When a packet dropout occurs, a missing information compensating part 430 correct the reconstructed sample sequences in a manner to reduce an error between the spectral envelope of the reconstructed sample sequence concerned and a known spectral envelope.Type: GrantFiled: August 23, 2002Date of Patent: April 3, 2007Assignee: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Akio Jin, Takeshi Mori, Kazunaga Ikeda
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Patent number: 7145484Abstract: A sample sequence ?S similar to a first or last sample sequence of the current frame is extracted from its samples SFC and concatenated, as an alternative sample sequence AS, to each of the front and back of the current frame, and the current frame with the alternative sample sequence concatenated thereto is subjected to filtering or prediction coding to obtain processing result SOU of the current frame. In the case of prediction coding, auxiliary information, which indicates which part of the current frame was used as the alternative sample sequence, is also output. By this, filtering, autoregressive prediction coding and decoding, which require processing extending over preceding and succeeding frames as in an interpolation filter, can be concluded in the current frame with substantially no degradation of the continuity and coding efficient of the reconstructed signal.Type: GrantFiled: November 20, 2003Date of Patent: December 5, 2006Assignee: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Noboru Harada, Akio Jin, Kazunaga Ikeda
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Patent number: 7126501Abstract: Digital signal samples X in a floating-point format, each of which is composed of 1 bit of sign, 8 bits of exponent E and 23 bits of mantissa M, are converted through rounding by an integer formatting part 12 into digital signal samples Y in an integer format, the sequence of the digital signal samples Y is losslessly compression-coded by a compressing part 13 into a code sequence Ca, and the code sequence Ca is output. The digital signal samples Y are converted by a floating point formatting part 15 into digital signal samples X? in the floating-point format, a difference signal ?X indicating the difference between the digital signal sample X? and the digital signal sample X is determined by a subtraction part 16, the difference signal ?X is losslessly coded, and the resulting code sequence Cb is output.Type: GrantFiled: April 27, 2004Date of Patent: October 24, 2006Assignee: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Dai Yang, Akio Jin, Kazunaga Ikeda
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Publication number: 20060181436Abstract: Digital signal samples X in a floating-point format, each of which is composed of 1 bit of sign, 8 bits of exponent E and 23 bits of mantissa M, are converted through rounding by an integer formatting part 12 into digital signal samples Y in an integer format, the sequence of the digital signal samples Y is losslessly compression-coded by a compressing part 13 into a code sequence Ca, and the code sequence Ca is output. The digital signal samples Y are converted by a floating point formatting part 15 into digital signal samples X? in the floating-point format, a difference signal ?X indicating the difference between the digital signal sample X? and the digital signal sample X is determined by a subtraction part 16, the difference signal ?X is losslessly coded, and the resulting code sequence Cb is output.Type: ApplicationFiled: April 27, 2004Publication date: August 17, 2006Applicant: Nippon Telegraph and Telephone Corp.Inventors: Takehiro Moriya, Dai Yang, Akio Jin, Kazunaga Ikeda
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Publication number: 20060087464Abstract: A sample sequence ?S similar to a first or last sample sequence of the current frame is extracted from its samples SFC and concatenated, as an alternative sample sequence AS, to each of the front and back of the current frame, and the current frame with the alternative sample sequence concatenated thereto is subjected to filtering or prediction coding to obtain processing result SOU of the current frame. In the case of prediction coding, auxiliary information, which indicates which part of the current frame was used as the alternative sample sequence, is also output. By this, filtering, autoregressive prediction coding and decoding, which require processing extending over preceding and succeeding frames as in an interpolation filter, can be concluded in the current frame with substantially no degradation of the continuity and coding efficient of the reconstructed signal.Type: ApplicationFiled: November 20, 2003Publication date: April 27, 2006Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Takehiro Moriya, Noboru Harada, Akio Jin, Kazunaga Ikeda
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Publication number: 20050091051Abstract: A down sampler 13 down samples a digital signal in the sampling frequency thereof from 96 kHz to 48 kHz on a frame-by-frame basis. The converted signal is compression encoded and output as a main code Im. An up sampler 16 converts a partial signal corresponding to the main code Im to a signal having the original sampling frequency 96 kHz, for example. An error signal between the up sampled signal and an input digital signal is generated. An array converting and encoding unit 18 array converts bits of sample chains of the error signal, thereby outputting an error code Pe. On a decoding side, a high fidelity reproduced signal is obtained based on the main code Im and the error code Pe, or a reproduced signal is obtained based on the main code Im only.Type: ApplicationFiled: March 10, 2003Publication date: April 28, 2005Applicant: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Akio Jin, Kazunaga Ikeda, Takeshi Mori
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Publication number: 20030046064Abstract: At the coder side, bits of samples of each frame of an input digital signal are concatenated every digit common to the samples across each frame to generate equi-order bit sequences, which are output as packets. At the decoding side, the input equi-order sequences are arranged inversely to their arrangement at the coder side to reconstruct sample sequences. When a packet dropout occurs, a missing information compensating part 430 correct the reconstructed sample sequences in a manner to reduce an error between the spectral envelope of the reconstructed sample sequence concerned and a known spectral envelope.Type: ApplicationFiled: August 23, 2002Publication date: March 6, 2003Applicant: NIPPON TELEGRAPH AND TELEPHONE CORP.Inventors: Takehiro Moriya, Akio Jin, Takeshi Mori, Kazunaga Ikeda
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Patent number: 6345246Abstract: In multichannel acoustic signal coding and decoding, left- and right-channel signals are alternately interleaved for each sample to generate a one-dimensional signal sample sequence. The one-dimensional signal sample sequence is subjected to coding based on correlation. In coding, the left- and right-channel signals may preferably be interleaved after reducing an imbalance in power between input channels.Type: GrantFiled: February 3, 1998Date of Patent: February 5, 2002Assignee: Nippon Telegraph and Telephone CorporationInventors: Takehiro Moriya, Takeshi Mori, Kazunaga Ikeda, Naoki Iwakami
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Patent number: 5260939Abstract: A speech transmission method utilizes a speech frame length having a time period within which a speech waveform remains substantially steady-state, and the speech frame length is selected to be 1/M the time period of one TDM or TDMA frame. For each speech frame, speech signal is coded, from which are selected M different speech codes including two speech codes that are spaced one or more speech frames apart, and the selected M speech codes are combined into composite codes. Each composite code is inserted in one time slot of each TDM or TDMA frame.Type: GrantFiled: April 20, 1992Date of Patent: November 9, 1993Assignee: Nippon Telegraph and Telephone CorporationInventors: Hirohito Suda, Kazunaga Ikeda