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"ZY[UTVU\E,0.=?| NOS򨧰ZY['&(fge{z|    4/ GG|jki|}yɼvrx IJH897  u   0QMgk DD|:9; rso   879 CL<=; 34s| AC} oȿ xywb_    H=z x '"LM8 ?IM>8} :M W  rk[@# s ^5+ A;^*# $ v  W^Y99i 8H)<6 e `hp ,<!C@}|v" I= g &G iX   %  8 0ttuvzx~u֒QRFJTIx  l!? DesktopRTACopyright 4Pockets.comZmainmain  e e 9E15gEلContentsa/ 2 4^DesktopRTAReal-Time Spectrum AnalyserQ E1 0AIntroductionDesktopRTA is a real-time sound analyser for your PC with many features only found in much more expensive sound analysis software. DesktopRTA provides accurate graphical feedback suitable for amateur hi-fi enthusiasts, A/V engineers / installers and electricians.DesktopRTA samples sounds from the input of your PC's sound card and then applies a Fourier Transformation to the samples to obtain a frequency spectrum. The result is an accurate representation of the sampled sound broken down into its frequency components.Zw& This version expands on our very successful PocketRTA adding a host of new features.>* $(5P:HFeatures Include&w# q@L1 25Pj3 4}Vertical Scale: Allows you to vertically scale either magnitude or phase depending on the selected mode. In the Transfer (Log) and Transfer (Linear) displays you can choose the dB range displayed. In Phase (Log) mode this option selects the range of Phase measured in degrees on display.Delay (ms): The Delay time allows you to allows for delays between reference and measurement signals when using the Transfer function. You can select one of the pre-defined times in the list or type in your own value. You can type in any time between 0 and 999.99 milliseconds.+/ , The Phase DisplayThe phase display can be used in conjunction with the transfer display and shows the phase shift, or time difference in the measurement signal relative to the reference signal for each frequency.A phase value of 0 for a given frequency data point means that both the measurement and reference are arriving at exactly the same point ij+ n a cycle at that frequency. Frequencies at which the measurement signal is arriving earlier in a cycle relative to the measurement signal will show a negative phase shift. At frequencies where the measurement signal is arriving later in the cycle you will see a positive phase shift. &jQ# B+3 6 " Figure 8Q"Q/ ,ESpectrograph DisplayA Spectrograph is a 3D representation of frequency/amplitude over time often used for analysing speech. Each row of the spectrograph represents the results of an FFT on a block of data read from the selected input device, the lowest row being the most recent. B&3 6 "Figure 9) -The colors represent the amplitude of the frequency at a given point in time. Colors range from BLUE, through CYAN, GREEN and YELLOW to RED being the color representing the loudest amplitude possible.You can halt the display at any time using the PAUSE button. It is also possible to use the cursor keys OR NAVIGATION BUTTONS to zoom into the spectrograph in order to focus on a frequency range. The image in figure 9 represents the results of a multi frequency sweep with the FFT buffer size set to 32K. Setting a higher value for the buffer size generally gives more accurate results. Figure 10 shows the same trace using an FFT buffer size of 8K&& # CN3 6""Figure 10 3 / ,mAs you can see because of the smaller buffer size the frequencies of the sweeps are concentrated into a smaller number of bins and therefore give a narrow trace.SPL - Sound Pressure Level DisplayThe SPL display is used to determine noise levels such as those recorded by sound level meters. Unlike these dedicated devices that are specifically designed and calibrated DesktopRTA works totally in the digital domain and can only be as accurate as the computer's sound hardware. DesktopRTA does not know the A/D converter's input voltage range or any other details about the gain structure of an input signal and therefore must be calibrated to obtain accurate sound pressure readings.N & -By default, DesktopRTA is internally calibrated so that the maximum input signal from your Analog to Digital converter gives a reading of 100db. C3 2 3 6""Figure 11R"  0 .EFigure 11 shows the SPL display and a default calibration level setting of 100db which can be modified in 1db increments during the calibration process. In order to calibrate DesktopRTA you need a standard Sound Level Meter (SLM).Calibrating DesktopRTA for SPL.The calibration process of the SPL display is relatively simple and requires the use of a standard Sound Level Meter. With DesktopRTA in SPL mode use the PC's PAGEUP and PAGEDN keys in order to adjust the calibration level until DesktopRTA's readout matches that of the SLM.W2 A PNote that if you change the gain of the microphone pre-amp or mixer settings then you will need to repeat the procedure above to recalibrate. Please Note: SPL is only as accurate as the hardware you are running on so it is important to use a good quality microphone. Using SPLIf the sound source contains short bursts or you are interested in peak readings then set Averaging to Off and Decay to Fast. This is roughly what you would expect from a SLM set to SLOW mode. To measure average sound levels set Averaging to 16 or higher. This is the equivalent of a SLM set to FAST mode. A0 .MBy default 'A Weighting' is selected when you enter SPL mode. A weighting is used for checking noise levels whereas 'C Weighting' is used for measuring levels of musical materialA .Weighting CurvesThe sensitivity of the human auditory system is highly level and frequency dependent. At frequencies below 500Hz and above 4Khz hearing sensitivity drops. This means that both extreme low and high frequency sounds tend to sound quieter than normal speech levels. To compensate most professional audio equipment use some kind of frequency-dependent weighting curve. Some common examples include the ANSI / IEC "A" and "C" weighting curves used in sound level measurements.aD' DesktopRTA can calculate the A, C and U weighted response curves and adjust the display to automatically compensate. DesktopRTA also provides a unique noise cancellation curve which subtracts background noise from the input signal. To use this functionality you should first turn off all weighting curves and then ensure there are no other noises present other than those you wish to eliminate. Finally select 'Noise Weighting' from the Weighting menu. The display should now show approx -100db across the spectrum. If necessary you can use the GAIN control to totally eliminate any remaining signals. fA%H9 @Averaging This function is used to help make the display more stable and easier to read. As a general rule, the more difficult the measurement conditions, the more averaging is required. Note however that increasing the number of averages also causes real-time displays to respond more slowly. If this is a problem then it may be better to increase the Decay time rather than use averaging at all.Decay TimeDecay is a setting which refers to how quickly a frequency dies. A large decay time is often useful for measuring a highly fluctuating signal. If the input source contains small bursts of energy then setting a higher 'Decay' time may be more favorable than setting a higher 'Averaging' value. Averaging would have the side effect of diluting a signal that was present in short bursts whereas setting a high Decay time would highlight the peaks.DJ: Bq"Tone GeneratorDesktopRTA has a built in tone generator capable of generating test signals for use in measuring frequency response. You can generate sine waves at 1K, 2K 4K, 8K and 16K as well as white noise. You can use the PC's headphone socket to route the output through equipment under test. To display the tone generator press the Test Tone button on the main toolbar. This will enable the tone generator toolbar below.C%HYJ3 6""Figure 12 JyL0 .To play a test tone select the desired tone and frequency from the appropriate list and press the Play button. You can adjust the volume of the test tone using the two small volume buttons to the left and right of the Tone button.TraceAll display modes accept the Spectrograph display a trace when this option is enabled. The trace shows the maximum amplitude over the frequency spectrum for a given period. This can be very handy if the input source has a rapidly fluctuating signal.YJN9 @PauseThe Pause feature temporarily freezes the display allowing close inspection of captured data. This is extremely useful when you have a highly fluctuating signal or when you need to take several readings across the frequency spectrum. When in PAUSE mode you can utilize DesktopRTA's zoom feature and take readings by clicking the left mouse button on various locations on the graph. Pressing the PAUSE key a second time resumes data capture.Capture Tracei:yL / ,w" DesktopRTA has the ability to capture and display up to 3 static traces for use with comparing input signals. The 3 capture buffer buttons capture and display a trace when pressed. To remove the trace simply depress the button. The following display shows 3 captured traces and a regular left channel trace.N  CNO3 6""Figure 13V1 % cIf you click and hold your left mouse button on the trace area you will notice two crosshairs appear which allow you to get the precise dB value for any frequency on display. If you wish to do the same with a captured trace you need to turn off the display temporarily using the SPACE bar. Pressing the SPACE bar again resumes the trace. When the real-time trace is turned off the crosshairs then focus on the first capture buffer containing data. If you wish to interrogate data in the RED trace buffer then you need to turn off the PURPLE and BLUE traces.O? LNOTE: When the real-time trace is active, clicking your left mouse button in the trace area gives details about the LEFT channel input. If you are displaying a STEREO trace you can get information about the RIGHT channel by pressing the SWAP button.Contact UsYou can contact us through our web site or via email address specified below:-Support Email:support@4pockets.comWeb Site:www.4Pockets.comCopyright (c) 2003 - 4Pockets.com2ل- * "11MS Sans SerifArialCourier NewTimes New Roman$exdJ$GeB   :Tg|`bʅ{} /&;)F24AveragingCapture TraceContentsdB Range Decay TimeDecibel LevelsDelayFeaturesFFT Settings Getting Started$Input Gain(Input Levels,Linear0Logarithmic4Microphone8Narrow band<Navigation@OctaveDPauseHPeak Level DisplayLPhasePSmoothingTSpectrographXSub Octave\Technical Information`The Phase DisplaydTone GeneratorhTracelTransfer DisplaypWeighting Curvest/&;)LzContents /&;)L4 ހ5*=yʅTey{J CQBGy! 7!dU%/l5} sLP"8oTULlp@$lpoʦ ???` `'`'o'`(o(o/p/o0p0p7p7p8p?8??OOOp pO/p @GO0Oo o o p@Ho@@H@_`_ooopxp@GG H O H O/O/P/P/W/W0X0W0X0_0_?_?`?g?`?g?g@h@o@h@o@oOpOwOpOwOwPxPP__?/_p@@P@@``ߐ___`````ooo@oopppϘpϟpϟϠϧР`/8xP؏ϧϨЧШЯЯ߯а߰߷߷߸߿ැฐ࿐࿟ЏǟǟǠȠ;;;;;;;;xN$;;v;L;#;;;;;;;;v;L;$;;;;;;;;v;L; ;;;;;;;B/;L; ;;;;;; ;;T;;;;;;  ;;U;;;;;; ;;V;;;;;  ;;W;;;; !;;X;;;;!;;Y;;;;  ;;Z;;; ;;[;; ; ;\;;v;L;/;;v;L;/;;v;L;/;w;M;;;;0;;;;;S;;;;S;;;;;;N;;~;;;;;;N;;~;;;;;;N;;~;;;;;;N;;~;;;;;;N;;+@;;;;s;;E;;+;;;;;;;;;;;;;;;;+;;+d;;;;;;;;;;;;;;+;;+;b;;;;;;;;;;;;;;~;;+;P;; ; ; ; ; ;;;;;;;; q;;+;P;;; ; ; ; ; ;;; ; ; ;;; ;p;;+;P ;;; ; ; ; ; ;;; 2; ; ;;; ;o;;+;P ;;;;;;;;;; ;;;;;; 2; ; ;;;n;n;;;0 ;;;;;;;; ;;;;;; 2; ; ;;;m;m;;;/ ;;;;;;;;;;;;;;;;;;; 2; ; ;;;l;l;;;/ ;;;;;;;;;;;;;; 2; ; ;;;l;l;;;/;;;;;;;; ;;;;;; 2; ; ;;;l;l;;;/;;;;;;;; ;;;;;; 2; ; ;;;m;l;;;0;;;; ;; ;;;; 2; ; ;;;;l;;;E;;; ; ; ; ; ;;; 2; ; ;;;a;` ;;;E ;;; ; ; ; ; ;;; ; ; ;;; ;_;_ ;;;I ;;; ; ; ; ; ;;;;;;;;&;_;_ ;;+;P ;;;;;;;;;;;;;;;&`;;_; ;;+;P ;;;;;;;;;;;;;;;;l;;+;P ;;;;;;;;;;;;;;;;l;;+;P;;;;;;;l;;+;a;;;;N;;;l;;+c;;;;;N;;;l;;;;;;N;;;l;;;;;;N;; l;;;;;;N;;~;;;;;;N;;~;;;;S;;;;S;;;|;;;;;;Z;;; ;X; ;; ;X; ;; ;X; ;;;X;;;;X;;;;X;;;;X;;;;X;;;;X;;;;X;;; ;X; ;; ;X; ;; ;Y; ;;[;    | ;    | ;    | ;    | ;    | ;    | ;    | ;    | ;    | ;    | ;    | ;    | ; L % "                          ; I # "                  ; I $ "                     ; J % #           !          ; J $ !                   ; L % #                     ;    | ;    | ;    | ; L & & $ & & & % & & & & % &  ;    L & & $ & & & % & & & & % &  ;  L & & $ & & & % & & & & % &  ;  M ;      ] ;      ] ;        ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     ] ;     1 + ;     1 + ;     0 e+ ;     0 e+ ;     0 e+ ;     0 e+ ;     0 e+ ;     / e, ;     / e, ;     / e- ;     / e- ;     / e- ;       / e- ;      . e- ; -e ;      - e- ;      - e- ;       - e- ;     - e- ;     - e- ;     - e e- ;     , e/ ;     , e/ ;     , e/ ;     * e0 ;     * e0 ;     * e0 ;     * e0 ;     * ee0 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     * e2 ;     ( ee2 ;     ( e3 ;     ( e3 ;     ( e3 ;     ( e3 ;     ( e3 ;     ( e4 ;     ( e4 ;     ( e4 ;     ( e4 ;   e e    e4 ;   e e = ee ee : e4 ;     e ee ; ee ee 7 e5 ;    e ee e e  ee ee.   e5 ; eeeeeeeeeeee.~e! ;    e" ee ee e  ee ee e e  ee ~  e e5 ;   ~ e  ee ee ee  ee ee ee  ee x  ee e7 ;   } e   ee ee  e  ee ee ee ee  ee x  ee e7 ; | e  ee ee e  ee ee ee e e  ee eex  e ee7 ; { e   e  e  ee ee ee e e ee  ee eex  e ee7 ; z e    ee  ee ee e e eee e ee   ee eex  e e8 ; y e   eo e e ee ee eee e eee e ee ee ee  eeeex  e ee8 ; x e D en e e ee ee eee e eee e ee ee e   eex  e ee8 ; w e F em e e ee ee eee e eee e eee e ee ee   e ep  e e e8 ; v e H el e e e e ee eee e eee e e e e ee ee   e ep  e e? 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