FILTER CIRCUIT
PROBLEM TO BE SOLVED: To provide a technology for setting the cut-off frequency of a low-pass filter in a read-channel appropriately. SOLUTION: The filter circuit comprises a low-pass filter 14, a time- measuring circuit 15, a storage/operation circuit 19 and a current supply circuit 18 where the ti...
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| creator | SAEKI HIDEKAZU |
| description | PROBLEM TO BE SOLVED: To provide a technology for setting the cut-off frequency of a low-pass filter in a read-channel appropriately. SOLUTION: The filter circuit comprises a low-pass filter 14, a time- measuring circuit 15, a storage/operation circuit 19 and a current supply circuit 18 where the time measuring circuit 15 counts the number of pulses of reference clock, the storing/operating circuit 19 determines the average value of first and second set values corresponding to the current value of a control current when the number of pulses of reference clock increases by 1, and the current supply circuit 18 supplies a control current corresponding to the average value to the low-pass filter 14. Since a control current of the current quantity corresponding to a current set value can be supplied, even if the same number of pulses are counted a plural number of times by determining a desired current set value from the average value of first and second set values, cut-off frequency can be set finely, even if the frequency of reference clock is low, by setting the current value of control current finely. |
| format | Patent |
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SOLUTION: The filter circuit comprises a low-pass filter 14, a time- measuring circuit 15, a storage/operation circuit 19 and a current supply circuit 18 where the time measuring circuit 15 counts the number of pulses of reference clock, the storing/operating circuit 19 determines the average value of first and second set values corresponding to the current value of a control current when the number of pulses of reference clock increases by 1, and the current supply circuit 18 supplies a control current corresponding to the average value to the low-pass filter 14. Since a control current of the current quantity corresponding to a current set value can be supplied, even if the same number of pulses are counted a plural number of times by determining a desired current set value from the average value of first and second set values, cut-off frequency can be set finely, even if the frequency of reference clock is low, by setting the current value of control current finely.</description><edition>7</edition><language>eng</language><subject>BASIC ELECTRONIC CIRCUITRY ; ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS ; INFORMATION STORAGE ; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER ; PHYSICS ; RESONATORS ; TRANSMISSION</subject><creationdate>2002</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20021129&DB=EPODOC&CC=JP&NR=2002344288A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20021129&DB=EPODOC&CC=JP&NR=2002344288A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>SAEKI HIDEKAZU</creatorcontrib><title>FILTER CIRCUIT</title><description>PROBLEM TO BE SOLVED: To provide a technology for setting the cut-off frequency of a low-pass filter in a read-channel appropriately. SOLUTION: The filter circuit comprises a low-pass filter 14, a time- measuring circuit 15, a storage/operation circuit 19 and a current supply circuit 18 where the time measuring circuit 15 counts the number of pulses of reference clock, the storing/operating circuit 19 determines the average value of first and second set values corresponding to the current value of a control current when the number of pulses of reference clock increases by 1, and the current supply circuit 18 supplies a control current corresponding to the average value to the low-pass filter 14. Since a control current of the current quantity corresponding to a current set value can be supplied, even if the same number of pulses are counted a plural number of times by determining a desired current set value from the average value of first and second set values, cut-off frequency can be set finely, even if the frequency of reference clock is low, by setting the current value of control current finely.</description><subject>BASIC ELECTRONIC CIRCUITRY</subject><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS</subject><subject>INFORMATION STORAGE</subject><subject>INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER</subject><subject>PHYSICS</subject><subject>RESONATORS</subject><subject>TRANSMISSION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2002</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZOBz8_QJcQ1ScPYMcg71DOFhYE1LzClO5YXS3AxKbq4hzh66qQX58anFBYnJqXmpJfFeAUYGBkbGJiZGFhaOxkQpAgAA-h1k</recordid><startdate>20021129</startdate><enddate>20021129</enddate><creator>SAEKI HIDEKAZU</creator><scope>EVB</scope></search><sort><creationdate>20021129</creationdate><title>FILTER CIRCUIT</title><author>SAEKI HIDEKAZU</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JP2002344288A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2002</creationdate><topic>BASIC ELECTRONIC CIRCUITRY</topic><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS</topic><topic>INFORMATION STORAGE</topic><topic>INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER</topic><topic>PHYSICS</topic><topic>RESONATORS</topic><topic>TRANSMISSION</topic><toplevel>online_resources</toplevel><creatorcontrib>SAEKI HIDEKAZU</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>SAEKI HIDEKAZU</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>FILTER CIRCUIT</title><date>2002-11-29</date><risdate>2002</risdate><abstract>PROBLEM TO BE SOLVED: To provide a technology for setting the cut-off frequency of a low-pass filter in a read-channel appropriately. SOLUTION: The filter circuit comprises a low-pass filter 14, a time- measuring circuit 15, a storage/operation circuit 19 and a current supply circuit 18 where the time measuring circuit 15 counts the number of pulses of reference clock, the storing/operating circuit 19 determines the average value of first and second set values corresponding to the current value of a control current when the number of pulses of reference clock increases by 1, and the current supply circuit 18 supplies a control current corresponding to the average value to the low-pass filter 14. Since a control current of the current quantity corresponding to a current set value can be supplied, even if the same number of pulses are counted a plural number of times by determining a desired current set value from the average value of first and second set values, cut-off frequency can be set finely, even if the frequency of reference clock is low, by setting the current value of control current finely.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS RESONATORS TRANSMISSION |
| title | FILTER CIRCUIT |
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