Marani LPP-480F Скачать руководство пользователя страница 51 | Manualshive

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As a consequence of the windowing process, the computed IR is not accurate in the low frequency

range: it is not possible to estimate the frequency response below the reciprocal of the analisys time

interval, due to the time-frequency duality. So, to avoid misleading view, the frequency response

plot shows a dotted line below 200Hz.

To proceed with the FIR filter computation, click “Next” button and the “Calculate FIR” page will

be shown.

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Содержание LPP-480F

Страница 1: ...User Manual LPP 480F...

Страница 2: ...omatically Each device have inside installed an Announce function in order to inform the sw PC when it is connected via TCP IP So at the first start up of the sw PC connected via TCP IP with the devic...

Страница 3: ...project configuration on the project file there are the information of each device system parameter and current program parameter added to a Device List see later the User can Save the current projec...

Страница 4: ...manage the project set by User New Save and Load project To close the App the User must click on the red button X Each time that the User close the App the system save automatically last configuration...

Страница 5: ...OK that is not possible to insert other device in USB Mode RS485 Mode must set an ID and this must be the same used on the device that the user want to connect The ID range is from 1 to 32 max 32 dev...

Страница 6: ...box press the button Remove to remove the device s in the Device List Search Device with the button Search Device is possible to check if there are devices connect to PC and still not inserted on the...

Страница 7: ...s STATUS is On line then if the User click on the colum STATUS of the device s row then the device switch in Off line mode after a confirmation vice versa if the device is Off line then switch in On...

Страница 8: ...ecall Program from Device 5 Reload the current Program with the Factory parameter 6 Copy one input channel to another input channel 7 Copy one output channel to another output channel 8 Utility 9 Firm...

Страница 9: ...enabled on the channel of the control modified then the value will be copied to the other channel with the link enabled 17 Link output channel same at the Link input channel see later how working the...

Страница 10: ...ble to set the automatic source priority Autoswitch on channel E F and G H When the Enable Autoswitch on Channel E F is set then independently of the set on the Source E F if the signal is present on...

Страница 11: ...Input Routing IN X CH X Ch Input to FIR Routing CH X FIR Y FIR to Ch Output Routing FIR Y CH Y Ch Output to Output Routing CH Y OUT Y...

Страница 12: ...block in two section FIR 1 to FIR 4 and FIR 5 to FIR 8 in order to have more flexibility on the number of the Taps of the FIR With the configuration present on the 1st row the system have 4 FIR with 1...

Страница 13: ...recorder the Output signal using a microphone See the appendix Wizard to understand how it is work 2 Import an exernal FIR see the appendix Import FIR Filter 3 View the current FIR loaded on the devi...

Страница 14: ...r can also enable the option Keep linked channels level offset this mean that when move a gain on a channel linked the other channel linked change the value with the same quantity but maintaining the...

Страница 15: ...alue On all control where is a Fader the User can change the value of the control in the following mode select the fader with mouse when the fader is selected the color change a1 press and hold the bu...

Страница 16: ...n of the keyboard to increase decrease the value or input the value on text box above the fader and press enter the range is from 15dB to 15dB step 0 5dB with a double click button left of the mouse o...

Страница 17: ...ency and the Gain of the Filter selected dipending of the filter Type i e for HP filter is not possible change the gain after release the button then the filter will be loaded on the device if it is c...

Страница 18: ...enabled then the User can see on the graphic the plot of the input channel enabled Output channel when the relative check box is enabled then the User can see on the graphic the plot of the output cha...

Страница 19: ...Time Attack Time Make up same on the output channel To change the value use the same management used for EQ DELAY on the Delay control is possible select the unit of the delay time ms distance m chan...

Страница 20: ...Compressor Activity on this Meter the User can see the Gain Reduction when the compressor is active MUTE POLARITY GAIN they are the same control present on the GAINS page...

Страница 21: ...ss IIR filter or FIR Filter dependent of the selector IIR FIR 7 PEQ Filter Graphic filter Magnitude or Phase Meter of the Channel and the Compressor Limiter activity Gain reduction About the PEQ Filte...

Страница 22: ...he IIR is selected then on the interface the system show the following control where is possible to see the standard Hp Lp IIR filter the frequency value is in the range from 20Hz to 20kHz and the fil...

Страница 23: ...to save the filter to a file txt in order to reload it as External filter or use it for other applications is possible to see the Amplitude and Phase of the FIR loaded the page to view only the plot...

Страница 24: ...of the Window Type max range 21dB to 120dB Window Type there are different type of window to calculate the FIR Rect Kaise Sinc Hanning Hamming Blackman Blackman Harris Blackman Nuttal Nuttal Kaiser B...

Страница 25: ...check box then the program stored will be locked and in that case the User can t overwite this program If the Program Store Lock is enabled then the User can t use the function Store Program the butt...

Страница 26: ...ut FIR is not included in the Copy function Copy Output Channel after press the button the system open the following window to copy a source output channel to a destination output channel The Output c...

Страница 27: ...ton the system show a window where is possible insert the Admin Password To insert the password the user must input on the text box 6 characters and press Enter The characters allowed are 0 9 A Z a z...

Страница 28: ...name on the relative text box max 6 characters Examples DEVICE NAME the User can change the device name Input the wanted name on the relative text box max 16 characters FIR CONFIG used to configure t...

Страница 29: ...saved to program recalled with the current status of the mute SRC SETTINGS this setting will be used by device to understand if it must switch automatically the source input E F and G H when the signa...

Страница 30: ...the Output Compressor Lock then the User can t edit all output RMS Compressor parameters when set the Output X Over Lock then the User can t edit all output HP LP IIR FIR filter parameters when set th...

Страница 31: ...3 use the apply button to confirm it EXIT Press the button to close the Utility page and comeback to the Edit window All modification not applied will be lost...

Страница 32: ...t PEQ filter will be shown Edit external PEQ window After clicking the Edit button of the single filter or Edit EQ button the system shows the following modal window with the selection of 13 PEQ filte...

Страница 33: ...equalizer amplitude or phase If the selected filter type is not external then the edit frame will appear as the following For external filters the edit frame will appear as the following...

Страница 34: ...ts floating point Max 2 Min 2 as decimal separator on the b0 a0 a2 a0 fields 2 the Plot and Store buttons start blinking to alert the User that something is changed on the filter 3 Click the Plot butt...

Страница 35: ...4 Click the Store button to load the new filter coefficients in the device After clicking the graphic will be updated as the following...

Страница 36: ...see later for the file format After selecting the file and clicking the open button the system shows the current filter imported and ask for a User confirmation to proceed The system reads and loads...

Страница 37: ...uild a filter every 5 coefficients So if the file contains 5 coefficients then the system loads the first filter PEQ1 10 coefficients then the system loads the first two filters PEQ1 2 40 coefficients...

Страница 38: ...0 94441023 a1 a0 1 90704896 a2 a0 0 91114086 Format CSV vertical b0 a0 0 96673063 b1 a0 1 90704896 b2 a0 0 94441023 a1 a0 1 90704896 a2 a0 0 91114086 Format CSV vertical b0 a0 0 96673063 b1 a0 1 9070...

Страница 39: ...99335516 1 98668904 0 98673160 0 01998113 0 03996227 0 01998113 1 42610018 0 50602472 1 00136094 1 99611786 0 99514177 1 99611786 0 99650271 0 96673063 1 90704896 0 94441023 1 90704896 0 91114086 1 0...

Страница 40: ...if FIR is selected the system show the following modal window where is possible Import an external FIR with max 512 taps for output or up to 4096 taps for Input FIR see the graphic Magnitude Phase Gro...

Страница 41: ...evice Before to store the external FIR loaded the User can see the Magnitude Phase and Group Delay if all is ok then click on the button Store and the Filter FIR will be updated with the new one the I...

Страница 42: ...l the separator of the decimal can be or see 3 examples of coef Coe1 4 76837158203125E 07 4 76837158203125E 07 4 76837158203125E 07 Coe2 4 76837158203125E 07 4 76837158203125E 07 4 76837158203125E 07...

Страница 43: ...the user in optimizing the response of a loudspeaker but driver choice as well as good cabinet and Xover design still remain the primary steps to achieve the best sound quality In general before using...

Страница 44: ...nd card a measurement microphone and at least a 4m x 5m x 4m L x W x H obstacle free measuring room if the available space is a little bit smaller check for possible tricks described in the following...

Страница 45: ...dspeaker to the microphone 2 the reflected sound wave path from an obstacle e g the floor or the wall to the microphone This will allow the Wizard algorithm to cancel out reflected components in the I...

Страница 46: ...eneath the mic a fine metal sheet under the mic can be useful for this purpose As the picture below shows in this measurement setup a lower room height is required with respect to the preceeding scena...

Страница 47: ...ASIO audio card to the PC where the FIR wizard is running with its proper connection USB Firewire etc Connect the normally balanced ASIO card output XLR or TRS to the balanced input XLR of the DSP de...

Страница 48: ...ghly the 6 dBFS value If during the microphone test some glitches occur it is probably due to a latency issue of the sound card To solve the problem open the sound card control panel clicking the ASIO...

Страница 49: ......

Страница 50: ...e position The calculation engine applies a windowing process to the first 10ms of the real IR centered on its peak value to remove unwanted obstacle reflections in such a way to provide an environmen...

Страница 51: ...ible to estimate the frequency response below the reciprocal of the analisys time interval due to the time frequency duality So to avoid misleading view the frequency response plot shows a dotted line...

Страница 52: ...he convolution between the IR and the FIR filter IRxFIR yellow line It represents the result of the IR compensation process that corresponds to what would be the IR if it is measured with FIR processi...

Страница 53: ...rsor coordinates while right cliking shows the plot zoom menu Let s now analize in more details the linearization capability of the computed FIR by comparing the time and frequency domain plots of the...

Страница 54: ...in this example The lower limit depends on the IR measurement technique as described in the IR Measurement section and on the poor resolution of the FIR filter at low frequencies The upper limit MaxFr...

Страница 55: ...w describe the user parameters related to the FIR filter generation Note that every time a user parameter is changed the Calculate FIR button at the top left of the screen start blinking meaning the F...

Страница 56: ...ophone results in the high frequency range can be not affordable This doesn t mean that a satisfactory FIR equalization can t be done on a slightly reduced band just choose a max frequency value and t...

Страница 57: ...thm scans the frequency response of the FIR filter searching for frequency points where the magnitude is above a given threshold Thr dB or below Thr dB In those points a moving average window is appli...

Страница 58: ...preferred where the compensation accuracy is the main target while lower latency values is often used in live sound system where the I O delay is a critical application parameter The effectiveness in...

Страница 59: ...ideal one especially for the magnitude response see the yellow curves As a general rule it is suggested to try different values for the latency parameter and choose the lower one that still gives sat...

Страница 60: ...bottom of the screen or by dragging the cursors in the plotting area The EQ target can be bypassed or enabled by clicking the EQ Bypass checkbox at the top center of the screen Clicking the Flat EQ T...

Страница 61: ...e and recalled from outside the Wizard or stored in the DSP to start listening tests To save the filter file click the Save FIR button at the top right of the Calculate FIR page a file browse window a...

Страница 62: ...lick the Measure button at the top left of the screen and wait in silence After the sine sweep completion the new IR is computed and shown in the time frequency domain plots It is possible to compare...

Страница 63: ...response is very low is not possible to calculate with precision the value of the phase below the plot with wrapped phase with Log and Lin scale frequencies and without latency below the plot with wr...

Страница 64: ...s and without latency scaleY from 2000 Deg to 1000 Deg scaleX from 1kHz to 2kHz used the Zoom and Shift below the plot with unwrapped phase Log scale frequencies and without latency scaleY from 2000 D...

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