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Persist.remove('gears');store=new Persist.Store('AV Tools');if(getPersist('distance')==null){store.set('distance','metre');}
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if(userInput){location.href='http://www.embu.co.uk/av-tools/';}}
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function roundPlaces(num,dec){var result=Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);return result;}
$("#settings").live('click',function(){var dist=$("#dist").val();var temp=$("#temp").val();var cablesize=$("#cablesize").val();var pinout=$("#pinout").val();store.set('distance',dist);store.set('temp',temp);store.set('cablesize',cablesize);store.set('pinout',pinout);popErrorMessage('Settings saved');return false;});$('input').live('focus',function(e){$(this).select();e.stopPropagation();});function padDigits(n,totalDigits){n=n.toString();var pd='',i;if(totalDigits>n.length){for(i=0;i<(totalDigits-n.length);i=i+1){pd+='0';}}
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function strrev(str){if(!str)return'';var revstr='';for(i=str.length-1;i>=0;i--)
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function setDips(dividend){count=0;bits=[];remainder=0;while(dividend>=2){remainder=dividend%2;bits.push(remainder);dividend=(dividend-remainder)/2;}
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if(dmx-offset<1){$("#minus").hide();}else if(dmx+offset>=511){$("#plus").hide();}});$("#minus").live('click',function(){var offset=parseInt($("#dmx_offset").val());var dmx=parseInt($("#dmx_add").val());$("#dmx_add").val(dmx-offset);setDips(dmx-offset);if(dmx-(offset*2)<1){$(this).hide();}else{$("#plus").show();}
return false;});$("#plus").live('click',function(){var offset=parseInt($("#dmx_offset").val());var dmx=parseInt($("#dmx_add").val());$("#dmx_add").val(dmx+offset);setDips(dmx+offset);if(dmx+(offset*2)>=511){$(this).hide();}else{$("#minus").show();}
return false;});$("#reset").live('click',function(){var page=$("form").attr("name");$("input").each(function(){var type=this.type,tag=this.tagName.toLowerCase();if(type==="text"||type==="number"||type==="password"||tag==="textarea"){this.value="";}
$(this).removeClass('missing');});if(page=="dmxaddress"){$("#dmx_add").val("1");$("#dmx_offset").val("1");$('img.dip_off').attr("src","../images/dip_off.png");$('img.dip_off').first().attr("src","../images/dip_on.png");}
var TempUnits=getPersist('temp');if(TempUnits==="fahrenheit"){temp_val=68;}else{temp_val=20;}
$(".temp").val(temp_val);$(".ui-footer h2").html("");return false;});$("form").live('submit',function(){var page=$(this).attr("name"),result;result=tools(page);$("h2."+page).html(result);return false;});function tools(page){var temp_val;switch(page){case"delaycalculator":var delayImp,delayTempUnits;delayImp=getPersist('distance');delayTempUnits=getPersist('temp');var delayDistance=parseFloat($('#delayDistance').val()),delayMs,delayTemp=parseFloat($('#delayTemp').val()),speed_of_sound;if(delayDistance&&delayTemp){if(delayImp==="feet"){delayDistance=delayDistance*0.3048;}
if(delayTempUnits==="fahrenheit"){temp_val=(delayTemp-32)*5/9;}else{temp_val=delayTemp;}
if(temp_val>=-273){speed_of_sound=331.5*Math.sqrt((temp_val+273.15)/273.15);delayMs=delayDistance*(1000/speed_of_sound);$('#delayDistance').removeClass('missing');$('#delayTemp').removeClass('missing');response="Delay "+round(delayMs)+" mS in dry air at "+delayTemp+" &#176; "+delayTempUnits;}else{response="Temperature must be above absolute zero";}}else{$('#delayDistance').addClass('missing');$('#delayTemp').addClass('missing');response="Please enter a distance and temperature";}
break;case"wavelength":var freqImp,waveTempUnits;freqImp=getPersist('distance');waveTempUnits=getPersist('temp');var freqHz=parseFloat($('#frequency').val()),freqTemp=parseFloat($('#waveTemp').val()),wavelength=parseFloat($('#wavelength').val()),wavelengthM;if(freqHz||wavelength){if(waveTempUnits==="fahrenheit"){temp_val=(freqTemp-32)*5/9;}else{temp_val=freqTemp;}
if(temp_val>=-273){speed_of_sound=331.5*Math.sqrt((temp_val+273.15)/273.15);if(freqHz>0){wavelengthM=speed_of_sound/freqHz;if(freqImp==="feet"){wavelengthM=roundPlaces(wavelengthM/0.3048,4)+" feet";}else{wavelengthM=roundPlaces(wavelengthM,4)+" metres";}
response="Wavelength "+wavelengthM;}else{freqHz=speed_of_sound/wavelength;if(freqImp==="feet"){freqHz=roundPlaces(freqHz/0.3048,0)+" Hz";}else{freqHz=roundPlaces(freqHz,0)+" Hz";}
response="Frequency "+freqHz;}
$('#frequency').removeClass('missing');$('#wavelength').removeClass('missing');$('#waveTemp').removeClass('missing');}else{response="Temperature must be above absolute zero";}}else{$('#frequency').addClass('missing');$('#wavelength').addClass('missing');$('#waveTemp').addClass('missing');response="Please enter either frequency or wavelength";}
break;case"splcalculator":var splDistUnits,dist_val;splDistUnits=getPersist('distance');var powerW=parseFloat($('#spl_power').val()),senseDb=parseFloat($('#spl_sense').val()),distanceM=parseFloat($('#spl_distance').val()),x=0,y=0,splDb;if(powerW&&senseDb&&distanceM){x=Math.log(powerW)/Math.LN10;if(splDistUnits==="feet"){dist_val=distanceM*0.3048;}else{dist_val=distanceM;}
distanceM=1/dist_val;y=Math.log(distanceM)/Math.LN10;splDb=(10*(x)+senseDb)+(20*(y));$('#spl_power,#spl_sense,#spl_distance').removeClass('missing');response="SPL "+round(splDb)+" dB";}else{$('#spl_power,#spl_sense,#spl_distance').addClass('missing');response="Please enter values for all fields";}
break;case"lowimpedance":var impcalcSpkr=[],impcalcConfig=$('#impcalc_config').val(),impcalcOut=0,i;impcalcSpkr[0]=parseFloat($('#impcalc_1').val());impcalcSpkr[1]=parseFloat($('#impcalc_2').val());impcalcSpkr[2]=parseFloat($('#impcalc_3').val());impcalcSpkr[3]=parseFloat($('#impcalc_4').val());if(impcalcSpkr[0]>0){if(impcalcConfig==="parallel"){for(i in impcalcSpkr){if(impcalcSpkr[i]){impcalcOut+=1/impcalcSpkr[i];}else{impcalcSpkr[i]=1;}}
impcalcOut=1/impcalcOut;}else{for(i in impcalcSpkr){if(impcalcSpkr[i]){impcalcOut+=impcalcSpkr[i];}else{impcalcSpkr[i]=0;}}}
$('#impcalc_1').removeClass('missing');response="Total Impedance: "+round(impcalcOut)+"&#937;";}else{$('#impcalc_1').addClass('missing');response="Please enter an impedance for speaker 1";}
break;case"dbuconverter":var dbu=parseFloat($('#dbuDbu').val()),dbv=parseFloat($('#dbuDbv').val()),dbuOut;if(dbu){dbuOut=Math.pow(10,(dbu/20))*0.775;response="Voltage "+round(dbuOut)+" volts";}else if(dbv){dbuOut=Math.pow(10,dbv/20);response="Voltage "+round(dbuOut)+" volts";}else{response="Please enter 1 value";}
break;case"a100vline":var lineImpedance=parseFloat($('#100v_impedance').val()),lineOut;if(lineImpedance){lineOut=10000/lineImpedance;$('#100v_impedance').removeClass('missing');response="Power "+round(lineOut)+" watts";}else{$('#100v_impedance').addClass('missing');response="Please enter an impedance";}
break;case"aspectratio":var arWidth=parseFloat($('#ar_width').val()),arHeight=parseFloat($('#ar_height').val()),arRatio=$('#ar_ratio').val();if(arWidth&&arRatio!=="blank"){if(arRatio==="16x9"){arHeight=(arWidth/16)*9;}else if(arRatio==="16x10"){arHeight=(arWidth/16)*10;}else if(arRatio==="4x3"){arHeight=(arWidth/4)*3;}
response="Height = "+round(arHeight);}else if(arHeight&&arRatio!=="blank"){if(arRatio==="16x9"){arWidth=(arHeight/9)*16;}else if(arRatio==="16x10"){arWidth=(arHeight/10)*16;}else if(arRatio==="4x3"){arWidth=(arHeight/3)*4;}
response="Width = "+round(arWidth);}else if(arHeight&&arWidth){arRatio=arWidth/arHeight;arRatio=round(arRatio);if(arRatio>=1.30&&arRatio<=1.35){arRatio="4:3";}else if(arRatio>=1.74&&arRatio<=1.80){arRatio="16:9";}else if(arRatio>=1.63&&arRatio<=1.69){arRatio="16:10";}else{arRatio=arRatio+":1";}
response="Aspect Ratio = "+arRatio;}else{response="Please enter 2 values";}
break;case"projectiondistance":var projThrow=parseFloat($('#proj_throw').val()),projWidth=parseFloat($('#proj_width').val()),projRatio=parseFloat($('#proj_ratio').val()),projOut;if(projThrow&&projRatio){projOut=projThrow*(1/projRatio);response='Width: '+round(projOut);}else if(projWidth&&projRatio){projOut=projWidth/(1/projRatio);response='Throw: '+round(projOut);}else if(projWidth&&projThrow){projOut=projThrow/projWidth;response='Ratio: '+round(projOut)+':1';}else{response="Please enter 2 values";}
break;case"dmxaddress":var dmxAdd=parseFloat($('#dmx_add').val()),bits,dividend,remainder,dmxAddOut,count;count=0;var bin=1,dmx=0;$('img.dip_off').each(function(){if($(this).attr("src")=="../images/dip_on.png"){dmx=dmx+bin;}
bin=bin*2;});$('#dmx_add').val(dmx);response="";break;case"beamwidth":var bwImp;bwImp=getPersist('distance');var bwAngle=$('#bw_angle').val(),bwDistance=$('#bw_distance').val(),bwBw=$('#bw_bw').val(),bwOut,bwOutstr="";if(bwDistance&&bwAngle||bwDistance&&bwBw||bwAngle&&bwBw){if(bwImp==="feet"){if(bwAngle&&bwDistance){bwOut=round(bwAngle*(0.018*bwDistance));bwOutstr="Beamwidth "+bwOut+" feet";}else if(bwBw&&bwDistance){bwOut=round(bwBw/(bwDistance*0.018));bwOutstr="Angle "+bwOut+"&#186;";}else if(bwBw&&bwAngle){bwOut=round((bwBw/bwAngle)/0.018);bwOutstr="Distance "+bwOut+" feet";}}else{bwDistance=bwDistance/0.3048;if(bwAngle&&bwDistance){bwOut=round(bwAngle*(0.018*bwDistance));bwOutstr="Beamwidth "+bwOut+" metres";}else if(bwBw&&bwDistance){bwOut=round(bwBw/(bwDistance*0.018));bwOutstr="Angle "+bwOut+"&#176;";}else if(bwBw&&bwAngle){bwOut=round(((bwBw/bwAngle)/0.018)*0.3048);bwOutstr="Distance "+bwOut+" metres";}}
response=bwOutstr;}else{response="Please enter 2 values";}
break;case"gelcuts":response="";var numSheets,maxCuts,maxCuts90,totalCost;var sheetWidth=parseFloat($('#gc_sheetwidth').val()),sheetHeight=parseFloat($('#gc_sheetheight').val()),sheetCost=parseFloat($('#gc_sheetcost').val()),cutHeight=parseFloat($('#gc_cutheight').val()),cutWidth=parseFloat($('#gc_cutwidth').val()),cutNum=parseFloat($('#gc_numcuts').val());if(sheetWidth&&sheetHeight&&cutHeight&&cutWidth){maxCuts=(Math.floor(sheetWidth/cutWidth))*(Math.floor(sheetHeight/cutHeight));maxCuts90=(Math.floor(sheetWidth/cutHeight))*(Math.floor(sheetHeight/cutWidth));if(cutNum<1){cutNum=1;}
if(maxCuts90>maxCuts){numSheets=Math.ceil(cutNum/maxCuts90);response="Rotate cut 90&#176; ";}else{numSheets=Math.ceil(cutNum/maxCuts);}
if(isNaN(numSheets)){response="Cut size must be smaller than sheet size";}else{response+="Sheets: "+numSheets;}
if(sheetCost){totalCost=numSheets*sheetCost;response+=" Cost: "+totalCost;}
$('#gc_sheetwidth').removeClass('missing');$('#gc_sheetheight').removeClass('missing');$('#gc_cutheight').removeClass('missing');$('#gc_cutwidth').removeClass('missing');}else{$('#gc_sheetwidth').addClass('missing');$('#gc_sheetheight').addClass('missing');$('#gc_cutheight').addClass('missing');$('#gc_cutwidth').addClass('missing');response="Please enter sheet and cut dimensions";}
break;case"powercalculator":var powerV=parseFloat($('#power_volts').val()),powerA=parseFloat($('#power_amps').val()),power=parseFloat($('#power_watts').val()),powerOut;if(powerV&&powerA){powerOut=powerV*powerA;powerOut="Power "+round(powerOut)+" watts";response=powerOut;}else if(powerV&&power){powerOut=power/powerV;powerOut="Current "+round(powerOut)+" amps";response=powerOut;}else if(powerA&&power){powerOut=power/powerA;powerOut="Voltage "+round(powerOut)+" volts";response=powerOut;}else{response="Please enter 2 values";}
break;case"voltagedrop":var vdImp;vdImp=getPersist('distance');var vdA=parseFloat($('#vd_amps').val()),vdD=parseFloat($('#vd_distance').val()),vdCs=$('#vd_cablesize').val(),vdOut;if(vdA&&vdD){vdCs=parseFloat(vdCs);if(vdImp==="feet"){vdD=vdD*0.3048;}
vdOut=(vdCs*vdA*vdD)/1000;$('#vd_amps, #vd_distance').removeClass('missing');vdOut="Voltage Drop "+round(vdOut)+" volts. Based on p.v.c insulated cables in freespace";response=vdOut;}else{$('#vd_amps, #vd_distance').addClass('missing');response="Please enter all values";}
break;case"dawdiskspace":var dawTrack=parseFloat($('#dawtracks').val()),dawDur=parseFloat($('#dawduration').val()),dawDs=parseFloat($('#dawds').val()),dawConfig=$('#daw_config').val(),dawBitrate=$('#daw_bitrate').val(),dawSampleRate=$('#daw_samplerate').val(),dawOut,tracks_out,duration_out,diskspace_out;if(!dawTrack&&!dawDur&&!dawDs){response="Please enter 2 values";}else if(!dawTrack&&!dawDur){response="Please enter 2 values";}else if(!dawTrack&&!dawDs){response="Please enter 2 values";}else if(!dawDur&&!dawDs){response="Please enter 2 values";}else{if(!dawTrack){duration=dawDur;diskspace=dawDs;if(dawConfig=="mono"){config=1;}else{config=2;}
bitrate=dawBitrate/8;samplerate=dawSampleRate;single_track=((samplerate*bitrate)*config)*(duration*60);tracks_out=(diskspace*1000000000.0)/single_track;response="Max Tracks "+round(tracks_out);}else if(!dawDur){tracks=dawTrack;diskspace=dawDs;if(dawConfig=="mono"){config=1;}else{config=2;}
bitrate=dawBitrate/8;samplerate=dawSampleRate;one_second=((samplerate*bitrate)*config)*tracks;duration_out=(diskspace*1000000000.0)/one_second;response="Max Duration "+formatIntoHHMMSS(duration_out)+" HH:MM:SS";}else if(!dawDs){duration=dawDur;tracks=dawTrack;if(dawConfig=="mono"){config=1;}else{config=2;}
bitrate=dawBitrate/8;samplerate=dawSampleRate;diskspace_out=(((samplerate*bitrate)*config)*(duration*60)*tracks);response="Total Diskspace "+bytesToSize(diskspace_out,4);}}
break;}
return response;}
function formatIntoHHMMSS(totalSec){hours=parseInt(totalSec/3600)%24;minutes=parseInt(totalSec/60)%60;seconds=parseInt(totalSec%60,10);return(hours<10?"0"+hours:hours)+":"+(minutes<10?"0"+minutes:minutes)+":"+(seconds<10?"0"+seconds:seconds);}
function bytesToSize(bytes,precision)
{var kilobyte=1024;var megabyte=kilobyte*1024;var gigabyte=megabyte*1024;var terabyte=gigabyte*1024;if((bytes>=0)&&(bytes<kilobyte)){return bytes+' B';}else if((bytes>=kilobyte)&&(bytes<megabyte)){return(bytes/kilobyte).toFixed(precision)+' KB';}else if((bytes>=megabyte)&&(bytes<gigabyte)){return(bytes/megabyte).toFixed(precision)+' MB';}else if((bytes>=gigabyte)&&(bytes<terabyte)){return(bytes/gigabyte).toFixed(precision)+' GB';}else if(bytes>=terabyte){return(bytes/terabyte).toFixed(precision)+' TB';}else{return bytes+' B';}}});