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公开(公告)号：DE2448802A1
公开(公告)日：1975-07-10
申请号：DE2448802
申请日：1974-10-12
Applicant: IBM
Inventor： HAAS LEE CLYDE , WEST LYNN PARKER
IPC: G06F13/00 , G06F13/22 , H04L12/403 , H04L11/16 , G06F15/20
Abstract: A communications enabling method and apparatus are disclosed in which the mean response time for the receipt of service from a central station at any one of a plurality of remote stations on a duplex communications channel network is reduced. The method and apparatus are designed to enable entire populations of remote stations or terminals, which potentially are awaiting service and have messages or data to transmit to use the channel. If only one response is received from such an enabling technique, the data is taken and the population is re-enabled. If more than one response is received and the responses conflict with one another, a re-enable sequence is conducted for some lesser plurality or sub group of the entire population until the contending responses are eliminated. The technique utilized is a partitioned search which eliminates contending stations in a rapid and effective manner.
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公开(公告)号：HK90893A
公开(公告)日：1993-09-10
申请号：HK90893
申请日：1993-09-02
Applicant: IBM
Inventor： WEST LYNN PARKER
Abstract: Automatic gain control in a digital signal processor is described. A predetermined threshold value, a predetermined automatic gain control value, and a predetermined count threshold value are established and stored in a data memory associated with a signal processor. Each incoming signal sample that is received is multiplied by the AGC value with the product being temporarily stored in the data memory. The absolute value of the resulting product is taken and added to the predetermined threshold value. If the result of this operation results in a signal processor overflow, then the AGC value is reduced and stored back into the data memory. The adjustment period of the AGC value is chosen to be well under the allowable distortion time for speech, dual tone multi-frequency reception, and modem operation.
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公开(公告)号：PH25270A
公开(公告)日：1991-03-27
申请号：PH34198
申请日：1986-08-29
Applicant: IBM
Inventor： WEST LYNN PARKER
Abstract: Automatic gain control in a digital signal processor is described. A predetermined threshold value, a predetermined automatic gain control value, and a predetermined count threshold value are established and stored in a data memory associated with a signal processor. Each incoming signal sample that is received is multiplied by the AGC value with the product being temporarily stored in the data memory. The absolute value of the resulting product is taken and added to the predetermined threshold value. If the result of this operation results in a signal processor overflow, then the AGC value is reduced and stored back into the data memory. The adjustment period of the AGC value is chosen to be well under the allowable distortion time for speech, dual tone multi-frequency reception, and modem operation.
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Patent Agency Ranking
公开(公告)号：BR8604623A
公开(公告)日：1987-05-26
申请号：BR8604623
申请日：1986-09-25
Applicant: IBM
Inventor： WEST LYNN PARKER
Abstract: A filter suppresses energy at time varying or ensemble varying frequencies. The filter comprises multiplier sections (15, 18, 16, 19) having sets of values which are dynamically varied during the receipt of time varying or ensemble varying energy. The variation of the values of the multiplier sections provides the suppression of energy at the time varying or ensemble varying frequencies. The sets of values for the multiplier sections are chosen such that the poles of such values lie within the unit circle of the z-plane locus. The location of the poles within the unit circle guarantees that the filter remain stable even though the multipliers may be located in a feedback path. In the preferred embodiment, the dynamically varying filter is used in a dual tone multi-frequency (DTMF) receiver.
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公开(公告)号：BR8604622A
公开(公告)日：1987-05-26
申请号：BR8604622
申请日：1986-09-25
Applicant: IBM
Inventor： WEST LYNN PARKER
Abstract: Automatic gain control in a digital signal processor is described. A predetermined threshold value, a predetermined automatic gain control value, and a predetermined count threshold value are established and stored in a data memory associated with a signal processor. Each incoming signal sample that is received is multiplied by the AGC value with the product being temporarily stored in the data memory. The absolute value of the resulting product is taken and added to the predetermined threshold value. If the result of this operation results in a signal processor overflow, then the AGC value is reduced and stored back into the data memory. The adjustment period of the AGC value is chosen to be well under the allowable distortion time for speech, dual tone multi-frequency reception, and modem operation.
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公开(公告)号：AU4927279A
公开(公告)日：1980-02-14
申请号：AU4927279
申请日：1979-07-26
Applicant: IBM
Inventor： ALVAREZ JOSEPH ANTHONY III , GOBIOFF BRUCE DEAN , WEST LYNN PARKER
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公开(公告)号：CH597726A5
公开(公告)日：1978-04-14
申请号：CH1686275
申请日：1975-12-30
Applicant: IBM
Inventor： BLASBALG HERMAN , MARKEY HAROLD G , WEST LYNN PARKER
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公开(公告)号：CH594337A5
公开(公告)日：1978-01-13
申请号：CH1686175
申请日：1975-12-30
Applicant: IBM
Inventor： MARKEY HAROLD G , WEST LYNN PARKER
Abstract: Digital exchange stations linked by earth satellite operate in a coordinately controllable time division switching and communication network system relative to externally attached telephone and data trunks. Modular switching equipment operating in coordination with satellite frames establishes and releases connection paths to trunk stores which interface with time and space domain channels of the system. Circuits through the system utilizing these paths are termed virtual connections because in different frames a circuit may be completed through different channels or even blocked under certain conditions. Telephone speech is converted between analog and digital forms relative to modular groups of 96 ports. Digital switching (slot interchange) equipment serving up to four groups (and cycling in coordination with satellite time division frames) cyclically completes local (intra-station) connections between ports and segments of toll (inter-station) connections between ports and locations in the trunk stores. The trunk stores comprise separate sections for system traffic bound to and from ports of the respective station. A duplicate arrangement of subsections in each section is alternately filled and emptied in successive frames; enabling the station to maintain continuity of communication relative to the system in successive frames. The 192 bit spaces of each location are filled in one frame and emptied in the next frame. Groups of 96 outbound locations are "virtually" associated for transmission with groups of 48 time division transmission channels of said facilities. The association operates by a process of selection termed voice activity compression (abbreviated VAC) based upon activity information developed at the port interface and carried through the switching equipment in positional association with trunk locations. The VAC process assigns only locations (virtual channels) containing activity to up to 46 of the 48 time channels, eliminating any excess of active virtual channels (over 46) in a selective order of priority. VAC mask information transmitted in a separate one of the 48 time channels indicates the virtual-to-real (96-to-46) assignment for the respective group in the respective frame. A bit in the mask for each virtual channel of the group indicates the assignment or elimination of the respective virtual channel. Assigned channels are transmitted in the time order of respective mask bits. Establishment of virtual connections is restricted system-wide by tables stored in the stations. These tables are subject to external modification and may contain path exclusion information enabling the system to remain effectively operational with inoperative elements.
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