the company evaluates the ability to realize its deferred tax assets based on all the facts and circumstances , including projections of future taxable income and expiration dates of carryover attributes . the calculation of our tax liabilities involves assessing uncertainties with respect to the application of complex tax rules and the potential for future adjustment of our uncertain tax positions by the internal page 26 of 80 revenue service or other taxing jurisdiction . if our estimates of these taxes are greater or less than actual results , an additional tax benefit or charge will result . see note 17  income taxes of the notes to consolidated financial statements contained in item 8 for additional details . ¡ we recognize revenue when all of the following criteria are met : persuasive evidence that an arrangement exists , delivery of goods has occurred , the sales price is fixed or determinable and collectability is reasonably assured . we evaluate our distributor arrangements , on a distributor by distributor basis , with respect to each of the four criteria above . for a majority of our distributor arrangements , we provide rights of price protection and stock rotation . revenue is deferred at the time of shipment to our domestic distributors and certain international distributors due to the determination that the ultimate sales price to the distributor is not fixed or determinable . once the distributor has resold the product , and our final sales price is fixed or determinable , we recognize revenue for the final sales price and record the related costs of sales . for certain of our smaller international distributors , we do not grant price protection rights and provide minimal stock rotation rights . for these distributors , revenue is recognized upon delivery to the distributor , less an allowance for estimated returns , as the revenue recognition criteria have been met upon shipment . further , the company defers the associated cost of goods sold on our consolidated balance sheet , net within the deferred income caption . the company routinely evaluates the products held by our distributors for impairment to the extent such products may be returned by the distributor within these limited rights and such products would be considered excess or obsolete if included within our own inventory . products returned by distributors and subsequently scrapped have historically been immaterial to the company . ¡ inventories are recorded at the lower of cost or market , with cost being determined on a first-in , first-out basis . we write down inventories to net realizable value based on forecasted demand , product release schedules , product life cycles , management judgment , and the age of inventory . actual demand and market conditions may be different from those projected by management , which could have a material effect on our operating results and financial position . see note 2  summary of significant accounting policies of the notes to consolidated financial statements contained in item 8 . ¡ we evaluate the recoverability of property , plant , and equipment and intangible assets by testing for impairment losses on long-lived assets used in operations when indicators of impairment are present and the undiscounted cash flows estimated to be generated by those assets are less than the assets ' carrying amounts . an impairment loss is recognized in the event the carrying value of these assets exceeds the fair value of the applicable assets . impairment evaluations involve management estimates of asset useful lives and future cash flows . actual useful lives and cash flows could be different from those estimated by management , which could have a material effect on our operating results and financial position . see note 6  goodwill and intangibles , net of the notes to consolidated financial statements contained in item 8 . ¡ the company evaluates the collectability of accounts receivable . we maintain allowances for doubtful accounts for estimated losses resulting from the inability or failure of our customers to make required payments . we regularly evaluate our allowance for doubtful accounts based upon the age of the receivable , our ongoing customer relations , as well as any disputes with the customer . if the financial condition of our customers were to deteriorate , resulting in an impairment of their ability to make payments , additional allowances may be required , which could have a material effect on our operating results and financial position . additionally , we may maintain an allowance for doubtful accounts for estimated losses on receivables from customers with whom we are involved in litigation . see note 5  accounts receivable , net of the notes to consolidated financial statements contained in item 8 . ¡ the company evaluates goodwill and other intangible assets . goodwill is recorded at the time of an acquisition and is calculated as the difference between the total consideration paid for an acquisition and the fair value of the net tangible and intangible assets acquired . the company tests goodwill and other intangible assets for impairment on an annual basis or more frequently if the company believes indicators of impairment exist . impairment evaluations involve management 's assessment of qualitative factors to determine whether it is more likely than not that goodwill and other intangible assets are page 27 of 80 impaired . if management concludes from its assessment of qualitative factors that it is more likely than not that impairment exists , then a quantitative impairment test will be performed involving management estimates of asset useful lives and future cash flows . significant management judgment is required in the forecasts of future operating results that are used in these evaluations . story_separator_special_tag fiscal year 2014 research and development expenses of $ 126.2 million reflect an increase of $ 12.1 million , or 11 percent , from fiscal year 2013. the increase was primarily attributable to a 23 percent increase in research and development headcount and associated salary-related expenses . additionally , during fiscal year 2014 , we experienced higher headcount and associated facilities costs , driving increased depreciation and amortization costs . cad software costs also increased for the year . selling , general and administrative expenses fiscal year 2015 selling , general and administrative expenses of $ 99.5 million reflect an increase of $ 24.6 million , or 33 percent , compared to fiscal year 2014. the increase was primarily attributable to the acquisition , resulting in increased sg & a headcount and related salary and employee-related expenses , as well as higher costs associated with outside professional services . fiscal year 2014 selling , general and administrative expenses of $ 74.9 million reflect a decrease of $ 2.1 million , or 3 percent , compared to fiscal year 2013. the decrease was primarily attributable to decreases in variable compensation , sales commissions and travel expenses for the period , despite an increase in headcount of 7 percent . acquisition related costs the company reported $ 18.1 million in costs in conjunction with the acquisition for the year ended march 28 , 2015. the majority of the costs included in this amount were associated with bank and legal fees , as well as certain expenses for stock compensation related to the acquisition . restructuring and other , net restructuring costs related to the acquisition were $ 1.5 million for the year ended march 28 , 2015 , primarily made up of severance payments associated with the acquisition in the current fiscal year and the consolidation of our sales functions . the credits included in this line item for the prior fiscal year related to changes in estimates for the tucson , arizona design center facility , due to a new sublease on the vacated property in connection with the closing of this facility . one-time charges for relocation , severance-related items and facility-related costs made up the fiscal year 2013 restructuring costs in relation to the closing of the tucson , arizona design center facility . patent infringement settlements , net the company reported a $ 0.7 million expense in the first quarter of fiscal year 2014 in connection with the settlement of the u.s. ethernet innovations , llc case discussed in note 14  legal matters . this item is presented as a separate line item on the consolidated statements of income within operating expenses under the caption patent infringement settlements , net. interest income interest income in fiscal years 2015 , 2014 , and 2013 , was $ 0.6 million , $ 0.8 million , and $ 0.4 million , respectively . the decrease from fiscal year 2014 was due to lower cash and cash equivalent balances for the year compared to prior year . the increase in interest income in fiscal year 2014 was due to higher cash and cash equivalent balances , compared to fiscal year 2013. page 32 of 80 interest expense the company reported interest expense of $ 5.6 million for the year ended march 28 , 2015 , primarily as a result of the new $ 250 million revolving credit facility described in note 9. no interest expense was recorded for fiscal years 2014 or 2013. other expense for the year ended march 28 , 2015 , the company reported $ 12.2 million in other expense primarily related to recognized losses on expired contracts during the fiscal year and the foreign currency exchange losses on hedges purchased in relation to the acquisition during the second quarter of the current fiscal year . the corresponding amounts in the prior fiscal years are immaterial . provision for income taxes we recorded income tax expense of $ 36.4 million in fiscal year 2015 on a pre-tax income of $ 91.5 million , yielding an effective tax provision rate of 39.7 percent . our effective tax rate was higher than the u.s. statutory rate of 35 percent , primarily due to the inclusion of foreign losses from the date of acquisition of wolfson to the end of the fiscal year at foreign statutory rates below the u.s. federal statutory rate . the impact of these losses was partially offset by the federal research and development credit , which was extended through december 31 , 2014 by the tax increase prevention act of 2014 , which was enacted on december 19 , 2014. we recorded income tax expense of $ 47.6 million in fiscal year 2014 on a pre-tax income of $ 155.7 million , yielding an effective tax provision rate of 30.6 percent . our effective tax rate was lower than the u.s. statutory rate of 35 percent , primarily due to the effect of a tax benefit of $ 6.3 million provided by the extraterritorial income exclusion act , an elective provision of the internal revenue code . another factor causing our tax expense to be below the federal statutory rate was the federal research and development credit which was in effect through december 31 , 2013 as a result of the american taxpayer relief act of 2013 , which was enacted on january 2 , 2013. we recorded income tax expense of $ 64.6 million in fiscal year 2013 on a pre-tax income of $ 201.2 million , yielding an effective tax provision rate of 32.1 percent . our effective tax rate was lower than the u.s. statutory rate of 35 percent , primarily as a result of federal research and development credits that were recorded during the year due to the retroactive extension of the credit by the enactment of the american taxpayer relief act of 2012 on january 2 , 2013. our effective tax rate was also lowered slightly by the release of $

liquidity and capital resources in fiscal year 2015 , our net cash provided by operating activities was $ 163.5 million . the positive cash flow from operating activities was predominantly due to the cash components of our net income , including a $ 17.3 million increase in changes to working capital , primarily due to decreases in inventory when excluding the impact of inventory obtained through the acquisition , offset by a larger increase in accounts payable for the period . in fiscal year 2014 , our net cash provided by operating activities was $ 228.0 million . the positive cash flow from operating activities was predominantly due to the cash components of our net income , and a $ 48.1 million increase in changes to working capital , primarily due to decreases in inventory for the period . in fiscal year 2013 , our net cash provided by operating activities was $ 160.8 million . the positive cash flow from operating activities was predominantly due to the cash components of our net income , partially offset by a $ 76.1 million reduction in changes to working capital , primarily due to an increase in inventory and accounts receivable as our business grew . page 33 of 80 in fiscal year 2015 , approximately $ 324.4 million was used in investing activities , primarily due to the $ 444.1 million , net of cash obtained , used in conjunction with the acquisition discussed in note 7. an additional use of cash for the period was the $ 32.3 million in property , equipment and software purchases for the year . these uses of cash were offset by net proceeds from the sale of marketable securities of $ 168.4 million in anticipation of financing the acquisition , referenced above , in the current fiscal year . in fiscal year 2014 , we used approximately $ 220.3 million in cash for investing activities , principally due to the net purchases of marketable securities of $ 182.5 million , $ 15.1 million in capital expenditures and $ 20.4 million related to the acoustic technologies , inc. ( acoustic ) acquisition .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```liquidity and capital resources in fiscal year 2015 , our net cash provided by operating activities was $ 163.5 million . the positive cash flow from operating activities was predominantly due to the cash components of our net income , including a $ 17.3 million increase in changes to working capital , primarily due to decreases in inventory when excluding the impact of inventory obtained through the acquisition , offset by a larger increase in accounts payable for the period . in fiscal year 2014 , our net cash provided by operating activities was $ 228.0 million . the positive cash flow from operating activities was predominantly due to the cash components of our net income , and a $ 48.1 million increase in changes to working capital , primarily due to decreases in inventory for the period . in fiscal year 2013 , our net cash provided by operating activities was $ 160.8 million . the positive cash flow from operating activities was predominantly due to the cash components of our net income , partially offset by a $ 76.1 million reduction in changes to working capital , primarily due to an increase in inventory and accounts receivable as our business grew . page 33 of 80 in fiscal year 2015 , approximately $ 324.4 million was used in investing activities , primarily due to the $ 444.1 million , net of cash obtained , used in conjunction with the acquisition discussed in note 7. an additional use of cash for the period was the $ 32.3 million in property , equipment and software purchases for the year . these uses of cash were offset by net proceeds from the sale of marketable securities of $ 168.4 million in anticipation of financing the acquisition , referenced above , in the current fiscal year . in fiscal year 2014 , we used approximately $ 220.3 million in cash for investing activities , principally due to the net purchases of marketable securities of $ 182.5 million , $ 15.1 million in capital expenditures and $ 20.4 million related to the acoustic technologies , inc. ( acoustic ) acquisition .
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 Suspicious Activity Report : the company evaluates the ability to realize its deferred tax assets based on all the facts and circumstances , including projections of future taxable income and expiration dates of carryover attributes . the calculation of our tax liabilities involves assessing uncertainties with respect to the application of complex tax rules and the potential for future adjustment of our uncertain tax positions by the internal page 26 of 80 revenue service or other taxing jurisdiction . if our estimates of these taxes are greater or less than actual results , an additional tax benefit or charge will result . see note 17  income taxes of the notes to consolidated financial statements contained in item 8 for additional details . ¡ we recognize revenue when all of the following criteria are met : persuasive evidence that an arrangement exists , delivery of goods has occurred , the sales price is fixed or determinable and collectability is reasonably assured . we evaluate our distributor arrangements , on a distributor by distributor basis , with respect to each of the four criteria above . for a majority of our distributor arrangements , we provide rights of price protection and stock rotation . revenue is deferred at the time of shipment to our domestic distributors and certain international distributors due to the determination that the ultimate sales price to the distributor is not fixed or determinable . once the distributor has resold the product , and our final sales price is fixed or determinable , we recognize revenue for the final sales price and record the related costs of sales . for certain of our smaller international distributors , we do not grant price protection rights and provide minimal stock rotation rights . for these distributors , revenue is recognized upon delivery to the distributor , less an allowance for estimated returns , as the revenue recognition criteria have been met upon shipment . further , the company defers the associated cost of goods sold on our consolidated balance sheet , net within the deferred income caption . the company routinely evaluates the products held by our distributors for impairment to the extent such products may be returned by the distributor within these limited rights and such products would be considered excess or obsolete if included within our own inventory . products returned by distributors and subsequently scrapped have historically been immaterial to the company . ¡ inventories are recorded at the lower of cost or market , with cost being determined on a first-in , first-out basis . we write down inventories to net realizable value based on forecasted demand , product release schedules , product life cycles , management judgment , and the age of inventory . actual demand and market conditions may be different from those projected by management , which could have a material effect on our operating results and financial position . see note 2  summary of significant accounting policies of the notes to consolidated financial statements contained in item 8 . ¡ we evaluate the recoverability of property , plant , and equipment and intangible assets by testing for impairment losses on long-lived assets used in operations when indicators of impairment are present and the undiscounted cash flows estimated to be generated by those assets are less than the assets ' carrying amounts . an impairment loss is recognized in the event the carrying value of these assets exceeds the fair value of the applicable assets . impairment evaluations involve management estimates of asset useful lives and future cash flows . actual useful lives and cash flows could be different from those estimated by management , which could have a material effect on our operating results and financial position . see note 6  goodwill and intangibles , net of the notes to consolidated financial statements contained in item 8 . ¡ the company evaluates the collectability of accounts receivable . we maintain allowances for doubtful accounts for estimated losses resulting from the inability or failure of our customers to make required payments . we regularly evaluate our allowance for doubtful accounts based upon the age of the receivable , our ongoing customer relations , as well as any disputes with the customer . if the financial condition of our customers were to deteriorate , resulting in an impairment of their ability to make payments , additional allowances may be required , which could have a material effect on our operating results and financial position . additionally , we may maintain an allowance for doubtful accounts for estimated losses on receivables from customers with whom we are involved in litigation . see note 5  accounts receivable , net of the notes to consolidated financial statements contained in item 8 . ¡ the company evaluates goodwill and other intangible assets . goodwill is recorded at the time of an acquisition and is calculated as the difference between the total consideration paid for an acquisition and the fair value of the net tangible and intangible assets acquired . the company tests goodwill and other intangible assets for impairment on an annual basis or more frequently if the company believes indicators of impairment exist . impairment evaluations involve management 's assessment of qualitative factors to determine whether it is more likely than not that goodwill and other intangible assets are page 27 of 80 impaired . if management concludes from its assessment of qualitative factors that it is more likely than not that impairment exists , then a quantitative impairment test will be performed involving management estimates of asset useful lives and future cash flows . significant management judgment is required in the forecasts of future operating results that are used in these evaluations . story_separator_special_tag fiscal year 2014 research and development expenses of $ 126.2 million reflect an increase of $ 12.1 million , or 11 percent , from fiscal year 2013. the increase was primarily attributable to a 23 percent increase in research and development headcount and associated salary-related expenses . additionally , during fiscal year 2014 , we experienced higher headcount and associated facilities costs , driving increased depreciation and amortization costs . cad software costs also increased for the year . selling , general and administrative expenses fiscal year 2015 selling , general and administrative expenses of $ 99.5 million reflect an increase of $ 24.6 million , or 33 percent , compared to fiscal year 2014. the increase was primarily attributable to the acquisition , resulting in increased sg & a headcount and related salary and employee-related expenses , as well as higher costs associated with outside professional services . fiscal year 2014 selling , general and administrative expenses of $ 74.9 million reflect a decrease of $ 2.1 million , or 3 percent , compared to fiscal year 2013. the decrease was primarily attributable to decreases in variable compensation , sales commissions and travel expenses for the period , despite an increase in headcount of 7 percent . acquisition related costs the company reported $ 18.1 million in costs in conjunction with the acquisition for the year ended march 28 , 2015. the majority of the costs included in this amount were associated with bank and legal fees , as well as certain expenses for stock compensation related to the acquisition . restructuring and other , net restructuring costs related to the acquisition were $ 1.5 million for the year ended march 28 , 2015 , primarily made up of severance payments associated with the acquisition in the current fiscal year and the consolidation of our sales functions . the credits included in this line item for the prior fiscal year related to changes in estimates for the tucson , arizona design center facility , due to a new sublease on the vacated property in connection with the closing of this facility . one-time charges for relocation , severance-related items and facility-related costs made up the fiscal year 2013 restructuring costs in relation to the closing of the tucson , arizona design center facility . patent infringement settlements , net the company reported a $ 0.7 million expense in the first quarter of fiscal year 2014 in connection with the settlement of the u.s. ethernet innovations , llc case discussed in note 14  legal matters . this item is presented as a separate line item on the consolidated statements of income within operating expenses under the caption patent infringement settlements , net. interest income interest income in fiscal years 2015 , 2014 , and 2013 , was $ 0.6 million , $ 0.8 million , and $ 0.4 million , respectively . the decrease from fiscal year 2014 was due to lower cash and cash equivalent balances for the year compared to prior year . the increase in interest income in fiscal year 2014 was due to higher cash and cash equivalent balances , compared to fiscal year 2013. page 32 of 80 interest expense the company reported interest expense of $ 5.6 million for the year ended march 28 , 2015 , primarily as a result of the new $ 250 million revolving credit facility described in note 9. no interest expense was recorded for fiscal years 2014 or 2013. other expense for the year ended march 28 , 2015 , the company reported $ 12.2 million in other expense primarily related to recognized losses on expired contracts during the fiscal year and the foreign currency exchange losses on hedges purchased in relation to the acquisition during the second quarter of the current fiscal year . the corresponding amounts in the prior fiscal years are immaterial . provision for income taxes we recorded income tax expense of $ 36.4 million in fiscal year 2015 on a pre-tax income of $ 91.5 million , yielding an effective tax provision rate of 39.7 percent . our effective tax rate was higher than the u.s. statutory rate of 35 percent , primarily due to the inclusion of foreign losses from the date of acquisition of wolfson to the end of the fiscal year at foreign statutory rates below the u.s. federal statutory rate . the impact of these losses was partially offset by the federal research and development credit , which was extended through december 31 , 2014 by the tax increase prevention act of 2014 , which was enacted on december 19 , 2014. we recorded income tax expense of $ 47.6 million in fiscal year 2014 on a pre-tax income of $ 155.7 million , yielding an effective tax provision rate of 30.6 percent . our effective tax rate was lower than the u.s. statutory rate of 35 percent , primarily due to the effect of a tax benefit of $ 6.3 million provided by the extraterritorial income exclusion act , an elective provision of the internal revenue code . another factor causing our tax expense to be below the federal statutory rate was the federal research and development credit which was in effect through december 31 , 2013 as a result of the american taxpayer relief act of 2013 , which was enacted on january 2 , 2013. we recorded income tax expense of $ 64.6 million in fiscal year 2013 on a pre-tax income of $ 201.2 million , yielding an effective tax provision rate of 32.1 percent . our effective tax rate was lower than the u.s. statutory rate of 35 percent , primarily as a result of federal research and development credits that were recorded during the year due to the retroactive extension of the credit by the enactment of the american taxpayer relief act of 2012 on january 2 , 2013. our effective tax rate was also lowered slightly by the release of $

