NAJDA Startup guide FW V1.3 - A NAJDA

III. Operating Najda Standalone

In order to create a Preset (i.e. a collection of DSP processing parameters), you need to connect the

PC control application to the board. In any other circumstance, Najda can operate standalone. This section sums up the features available in standalone operation.

Functions 1 to 6 enumerated below are accessible by pressing a keypad's button or a remote controller button. The remaining functions are available in the menu.

Preset and Source change require to enter the menu – but they may also be assigned to remote controller buttons. See the details further below.

III.1. StandBy

Press this button to turn on or put the board in stand by mode. Before the board goes in stand by, the micro must complete a certain number of operations, among which storing all the settings (volume, balance, source etc) in the EEPROM, so always end your listening session by going into stand by.

Don't take the power off the board unless Najda is already in Stand By mode otherwise you will loose your settings.

III.2. Mute

Press this button to mute the analogue outputs. SPDIF and I2S outputs are not affected.

III.3. Volume

From the main screen, press the Up or Down button – or the assigned remote controller buttons – to set the volume to your liking, in the range 0 dB to -96 dB in dB steps. Volume doesn't affect SPDIF and I2S output levels.

III.4. Bass

From the main screen, press the Left button, then press the Up/Down buttons to adjust the amount of bass – or press the assigned remote controller buttons. Bass is adjustable in dB steps in the range

-6/+6 dB. This function implements a low frequency shelving filter whose corner frequency is adjustable in the PC application. Headroom adjustment is also available.

Bass and Treble can be disabled in order to save DSP resources.

III.5. Treble

From the main screen, press the Right button, then press the Up/Down buttons to adjust the amount of treble – or press the dedicated remote controller buttons. Treble is adjustable in dB steps in the range -6/+6 dB. This function implements a high frequency shelving filter whose corner frequency is adjustable in the PC application. Headroom adjustment is also available.

Bass and Treble can be disabled in order to save DSP resources.

III.6. Balance

From the main screen, press the Set button, then press the Left or Right button to adjust channel balance in dB steps – or use the Balance Left/Right buttons on your remote controller. You can attenuate one of the channels down to -15 dB in dB steps.

III.7. Menu

From the main screen, press the Menu button to enter the menu. Press the Left or Right key to navigate through the menu pages and locate the item you wish to modify, and use the Up and Down keys to scroll through the available options. Then press the Set button to validate the current option or press Menu again to exit the menu and discard the change. Refer to Appendix E for the menu structure diagram.

WAF Audio – Najda Startup Guide FW V1.3 - A 12

Source Select

Allows selecting the input source. This command is also available from the remote controller.

Source Exp1 (I2S) is available only if pin IS_EXT1\ is tied to DGND (see section I.6).

Preset Select

Allows selecting a processing preset. This command is also available from the remote controller.

Najda has memory space provision for up to nine presets. If - say - only three presets have been stored into the board's memory, then only three options will appear under this menu item. There must always be at least one preset in the board's memory (the PC control application will not let you deleting all of the presets). Preset names are user specified (up to 13 characters).

IR Remote Ctrl

This menu item will start the IR Remote learn procedure. Select the protocol of your controller

(NEC, JVC, Apple and RC5 supported), then follow the instructions on the display.

The procedure will first identify the controller's address, then subsequently collect your controller's key codes for each of the commands available.

If you don't want to use a command with your remote (for example because your controller has less buttons than the number of commands available), you can choose to skip that command. You can anytime cancel the routine by pressing the Left keypad button and start over again. Refer to the instructions on the display.

Following are a few recommendations, some of these should be pretty obvious.

- While you run the Learn Ir procedure, press the controller's keys once when requested.

- Don't select the same controller key for different commands.

- Press only one key at a time.

Below is the list of commands available for the remote controller:

–

Stand By

–

Mute

–

Volume +/-

–

Preset +/-

–

Source Next (one single command for selecting next available source)

–

Source Analogue / Coaxial / Optical / Expansion 1 (individual commands)

–

Preset 1 → Preset 9

–

Bass +/-

–

Treble +/-

–

Balance L/R

When the routine has gone through the list of commands, the screen displays

Protocol Capture

Completed

and the board is ready to receive commands from the remote controller.

Relay Timer

Lets you set a delay after which Najda will command the external relay on when coming out of

Stand By mode. The relay is turned off immediately when Najda enters Stand By mode.

Display Mode

With a LCD display, you can choose to have the backlight

Always ON

,

Always OFF

or

Auto OFF

.

In the latter mode, the backlight turns on every time an event occurs (button press or remote

WAF Audio – Najda Startup Guide FW V1.3 - A 13

controller command) and turns off automatically after 2 seconds of inactivity.

With OLED and VFD displays, only the

Always ON

and

Auto OFF

options are available.

LCD Contrast – VFD Brightness (not available with OLED displays)

For LCD displays, this menu item offers 12 levels of contrast so that you can optimally adjust the contrast for that particular LCD display you've picked.

For VFD displays, the menu item lets you select among 4 levels of brightness.

OLED displays don't feature any contrast or brightness adjustment. As a consequence this item is not available in the menu when an OLED display has been selected.

This menu item has a couple of peculiarities. One is that it does not wrap around when you have reached the minimum or maximum contrast / brightness. The other is that the setting is remembered whether you press the Set or the Menu key to exit the menu. This is because Najda expects that you won't leave the menu until you're happy with the settings.

Wake Up Host

If Najda is connected to a computer that's hibernating or in Sleep mode, taking Najda out of Stand

By mode will also wake up the computer. Note however that you should not let a connected computer go into sleep mode while the control application is active.

Volume Control

By default, volume is adjusted by pressing the Up and Down buttons. Volume can also be controlled via a rotary encoder connected to Expansion Port 1 if the appropriate hardware is installed and if this menu option is set accordingly. See Section I.6 for details.

WAF Audio – Najda Startup Guide FW V1.3 - A 14