-
公开(公告)号：US3427444A
公开(公告)日：1969-02-11
申请号：US3427444D
申请日：1965-02-15
Applicant: IBM
Inventor： TANG DONALD T
CPC classification number: H04L1/0057 , H03M13/15
-
公开(公告)号：US3622986A
公开(公告)日：1971-11-23
申请号：US3622986D
申请日：1969-12-30
Applicant: IBM
Inventor： TANG DONALD T , KOBAYASHI HIASHI
IPC: H04L1/00 , H04L25/48 , H04L25/497 , G06F11/08
CPC classification number: H04L25/497
Abstract: Errors introduced during the transmission of digital sequences that have undergone correlative level coding with initial precoding are detected by a scheme that takes advantage of the inherent redundancy in correlative level coding. The received message is decoded in a succession of steps, the first of which is an inverse filtering operation that performs the exact inverse of the correlative encoding operation. If the channel was errorfree during this transmission, the sequence constructed by the inverse filtering process is identical with the precoded sequence that was subjected to correlative level coding prior to transmission. If the channel was not error-free, then the sequence constructed by inverse filtering differs from the initial precoded sequence. Whereas the precoded sequence is constrained to a certain permitted number of voltage levels, say m levels, the sequence constructed by inverse filtering is not so constrained and may assume more than m levels. If more than m levels are occupied by the inversely filtered signal, this condition is detected as an indication of transmission error. The final decoding step is performed after this error test is accomplished.
-
公开(公告)号：US3648265A
公开(公告)日：1972-03-07
申请号：US3648265D
申请日：1969-12-30
Applicant: IBM
Inventor： KOBAYASHI HISASHI , TANG DONALD T
CPC classification number: G11B20/10009
Abstract: A digital magnetic recording system which uses conventional NRZI coding and a readback channel of conventional design operates, in effect, as a precoding and correlative level coding process that is characterized by a transfer function of 1-D (where ''''D'''' is a delay operator). Under these conditions, the minimum spacing that can be permitted between adjacent digit symbols in the magnetic recording medium without incurring excessive intersymbol interference during readback is rather large and severely limits the recording density. The present invention uses interleaved NRZI coding and a special filter in the readback channel to provide a precoding and correlative level coding scheme characterized by a transfer function 1-D2. This mode of operation permits much denser packing of the data in the recording medium without causing excessive intersymbol interference during readback.
Abstract translation: 使用常规NRZI编码的数字磁记录系统和传统设计的回读通道实际上作为预处理和相关电平编码处理，其特征在于1-D的传递函数（其中“D”是延迟算子 ）。 在这些条件下，在磁记录介质中相邻数字符号之间可以允许的最小间距，而不会在回读期间引起过多的符号间干扰，这是相当大的，严重限制了记录密度。 本发明在回读通道中使用交错NRZI编码和特殊滤波器来提供以传递函数1-D2为特征的预编码和相关级编码方案。 这种操作模式允许数据在记录介质中更加密集地打包，而不会在回读期间引起过多的码间干扰。
-
4.发明授权
公开(公告)号：US3647964A
公开(公告)日：1972-03-07
申请号：US3647964D
申请日：1970-02-24
Applicant: IBM
Inventor： TANG DONALD T
CPC classification number: H04L25/4906
Abstract: To increase the rate at which data can be passed without intersymbol interference through an equalized low-pass channel of the raised-cosine-type each input digit sequence undergoes a preliminary encoding process that converts it into a corresponding run-length-limited sequence in which every ''''1'''' digit is separated from every other ''''1'''' digit in the sequence by at least one intervening ''''0'''' digit. The digits of such a run-length-limited sequence can pass through a modified raisedcosine channel without intersymbol interference at a rate that is twice the maximum rate at which this channel can reliably pass the digits of sequences containing 1''s in immediately adjacent positions.
Abstract translation: 为了增加数据可以通过升余弦型每个输入数字序列的均衡低通道的符号间干扰的速率经历初步编码处理，其将其转换成相应的游程长度受限序列，其中 每个“1”数字与序列中的每隔一个“1”数位分开至少一个中间的“0”位。 这种游程长度限制序列的数字可以以不超过符号间干扰的修改的升余弦信道的速率通过，该速率是该信道可以可靠地通过紧邻位置中包含1的序列的数字的最大速率的两倍。
-
公开(公告)号：JP2002328695A
公开(公告)日：2002-11-15
申请号：JP2002085138
申请日：2002-03-26
Applicant: IBM
Inventor： TANG DONALD T , SHEN LIGIN , SHI QIN , ZHANG WEI
Abstract: PROBLEM TO BE SOLVED: To provide a method for generating a personalized voice from a text. SOLUTION: The method for generating the personalized voice from the text includes a step for analyzing the input text and obtaining standard parameters of a voice to be synthesized from a standard text voice database, a step for mapping the standard parameters to personalized voice parameters with a personalized model obtained in a training process, and a step for synthesizing a voice corresponding to the input text according to the personalized voice parameters. This method is used to simulate the voice of an object person and turn the voice generated by a TTS system into a more attractive and personalized voice.
-
Patent Agency Ranking
-
公开(公告)号：HK1021576A1
公开(公告)日：2000-06-16
申请号：HK00100519
申请日：2000-01-28
Applicant: IBM
Inventor： TANG DONALD T , SU HUI , WANG QIAN YING
IPC: G06F20060101 , G06F
-
公开(公告)号：FR2325148A1
公开(公告)日：1977-04-15
申请号：FR7625013
申请日：1976-08-10
Applicant: IBM
Inventor： TANG DONALD T
Abstract: A method and apparatus for the recovery of loop frame synchronization in a magnetic bubble domain memory are disclosed. One loop of the memory is used to store the parity of corresponding bits for the other loops. A special sequence of even/odd parity pattern with a peaked autocorrelation function is inserted at the end or start of the loop frame in place of the normal even or odd parity in the parity loop. The special sequence of even/odd parity pattern is detected by a pattern recognizer to re-establish loop frame synchronization.
-
公开(公告)号：CA2313968A1
公开(公告)日：2001-01-27
申请号：CA2313968
申请日：2000-07-17
Applicant: IBM
Inventor： SHEN LI QIN , QIN YONG , WANG QIAN YING , TANG DONALD T , SU HUI
Abstract: The invention discloses a method for correcting the error characters in the result of speech recognition and a speech recognition system. The method comprises the following steps: marking the error characters in the result of speech recognition; inputting the correct characters corresponding to the marked error characters by the input based on character s- shape; recognizing the stroke-based input; displaying the candidate characters; selecting the desired characters from the candidate characters by the user; and replacing the error characters wit h the selected characters, said method characterized by further comprising steps: filtering the candidate characters by means of the acoustic information of the error characters.
-
公开(公告)号：FR2376489A1
公开(公告)日：1978-07-28
申请号：FR7735670
申请日：1977-11-21
Applicant: IBM
Inventor： LIN YEONG S , LIU CHAO N , TANG DONALD T
Abstract: A relational data base system utilizing magnetic bubble domain storage. The bubble domain storage is located on a magnetic chip and includes storage circuitry for storing bubble domains in columns and rows. The bubble domains are coded to represent data, and the rows and columns of bubbles correspond to tables of data which are determined by various relations. Current activated transfer gates located on the magnetic chip are used to select a particular row or a particular column of bubble domains for accessing. The magnetic chip also includes a write circuit for writing bubble domains into storage and a read circuit for reading bubble domains removed from storage. Located off the magnetic chip are column addressing circuits, row addressing circuits, interface circuitry, and a computer central processing unit. The interface circuitry is located between the central processing unit and the bubble domain storage chip, while the column and row addressing circuits provide inputs to a transfer control circuit that is used to activate selected current carrying lines when it is determined to access a particular row or column of bubbles in storage. New information can be entered into any of the stored tables of bubble domains, and information can be removed from any of the stored tables. Also, new tables of information can be provided in storage by combining selected rows or columns of tables already in storage.
-
-
-
-
-
-
-
-
-
Search Results
13
records
(took 0.024 seconds)
