Patents by Inventor Yoshinobu Ishida
Yoshinobu Ishida 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: 5495552Abstract: An audio signal is recorded in a semiconductor memory in a plurality of hierarchical levels, with the lowest level being adequate for reproduction with a certain reduced degree of fidelity. Successively higher hierarchial levels provide successively greater fidelity when reproduced. When the memory has been determined to have reached maximum capacity, recording continues by overwriting the highest hierarchical level of data currently stored in the memory with lower hierarchical levels of new data. A code is recorded in the memory, indicating the number of hierarchical levels recorded therein, for subsequent reproduction. The audio signal can furthermore be recorded in variable-length frames and reproduced at high speed by reading every N-th frame, N being a positive integer, or by reading only frames having at least a certain minimum length.Type: GrantFiled: April 14, 1993Date of Patent: February 27, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhiro Sugiyama, Yukari Ono, Yoshinobu Ishida
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Patent number: 5461630Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: October 3, 1994Date of Patent: October 24, 1995Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 5353290Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: June 30, 1993Date of Patent: October 4, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 5233480Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: September 4, 1992Date of Patent: August 3, 1993Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 5151830Abstract: A magnetic recording and reproducing apparatus records audio signals digitized by rotary heads (9, 10) on a magnetic tape (12), and reproduces the recorded audio signals. Clock signals and time code data are extracted from externally inputted time code signals by means of a demodulating circuit (72), and phase difference between the frame clock signals and the reference signal is detected by a phase difference detecting circuit (74). A microcomputer (23) assigns the phase difference information and the time code data to sub code packs and stores the same in the memory circuit (4). The stored phase difference information and the time code data are recorded on the magnetic tape. In reproduction, the microcomputer outputs the original time code signals responsive to the reproduced phase difference information and the time code data.Type: GrantFiled: October 9, 1991Date of Patent: September 29, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenji Goto, Manabu Tsukamoto, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 5146370Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: July 18, 1991Date of Patent: September 8, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 5113293Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: November 29, 1990Date of Patent: May 12, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 5097364Abstract: A magnetic recording and reproducing apparatus records audio signals digitized by rotary heads (9, 10) on a magnetic tape (12), and reproduces the recorded audio signals. Clock signals and time code data are extracted from externally inputted time code signals by means of a demodulating circuit (72), and phase difference between the frame clock signals and the reference signal is detected by a phase difference detecting circuit (74). A microcomputer (23) assigns the phase difference information and the time code data to sub code packs and stores the same in the memory circuit (40). The stored phase difference information and the time code data are recorded on the magnetic tape. In reproduction, the microcomputer outputs and original time code signals responsive to the reproduced phase difference information and the time code data.Type: GrantFiled: December 11, 1989Date of Patent: March 17, 1992Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kenji Goto, Manabu Tsukamoto, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 4905100Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: June 30, 1988Date of Patent: February 27, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 4835627Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: February 27, 1987Date of Patent: May 30, 1989Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 4675754Abstract: A magnetic recorder/reproducer converts two-channel analog signals into digital signals by a sample-and-hold/A-D converter circuit (3) and controls addresses in a memory circuit (4) by a memory address control circuit (5), to distribute the digital signals into odd sample groups and even sample groups per each channel for arraying the odd sample groups and the even sample groups of the same channel in alternate scanning intervals, thereby to write the same in the memory circuit so that the odd samples and the even samples of the same channel are arrayed in positions separated from each other along the direction of scanning by rotary heads (10, 11). The digital signals thus permutated are modulated by a modulation circuit (7), to be recorded in a magnetic tape by the rotary heads. The digital signals reproduced by the rotary heads are demodulated by a demodulation circuit (14), to be stored in a memory circuit (15).Type: GrantFiled: January 29, 1985Date of Patent: June 23, 1987Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuhito Endo, Masayuki Ishida, Yoshinobu Ishida
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Patent number: 4143406Abstract: A PCM signal is divided into groups each including S sampled values represented by B bits respectively and R code error check bits are added to each group to form one frame. The frames are successively and repeatedly recorded in N tracks on a recording medium with frame synchronizing signals each including M bits, the signals alternating the frame in each track. The frame synchronizing signal in each track delays the next track by m bits. The m satisfiesm = (B .times. S + R - m')/(N - 1) and M = m - m'Where m' designates the number of bits fully filling a temporal spacing between the end of the frame synchronizing signal in each track and the beginning of the next track.Type: GrantFiled: August 22, 1977Date of Patent: March 6, 1979Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Takehiko Tsuiki, Ken Onishi, Yoshinobu Ishida, Kazuhiro Chiba