TEAC DM-4800 DM-4800 Owner's Manual - Page 56

3 - Connections : Clock setting Clock setting When the connections have been made to the DM4800, you must select a clock source. The master clock source is also used to determine the sampling frequency for the whole project. Remember that the DM-4800 can act as a clock source or clock master, but there must be only one master clock source in your studio setup. Press the PROJECT key until the CLOCK screen appears: After confirming that you want to do this, a popup appears, informing you of the status of all potential clock sources. Figure 3.8: PROJECT CLOCK screen Fs MODE The first item to be selected is the use of the high-speed or normal clock. When the lower 88.2K/96K (high-speed) option is selected, many of the 44.1K and 48K legends on the screen as shown above (Figure 3.8, PROJECT CLOCK screen change to 88.2K and 96K respectively. In addition, in high-speed mode, the digital inputs are also available, and the number of available clock sources on the optional AES/EBU interface card (if fitted) is reduced. In both the high-speed and the normal speed clock screen, the current clock status is displayed at the top of the screen (as shown above). Checking the clock You can make a check of the system by moving the cursor down to the bottom of the screen and pressing the CHECK [START] button. Figure 3.9: Checking the clock sources Varispeed clocking Note that the DM-4800 is able to accept audio data and clock signals from "varispeed" devices, provided the playback speed and hence the sampling frequency is within 6% of the nominal frequency. Of course, when the out-of-normal clock is to be retransmitted to other devices, it depends on the implementation of the other devices as to whether the clock can successfully be accepted by them. Clock change action When the FS mode (that is, changing between high-speed and normal) is changed, you can select KEEP to remain the existing mixer configuration (MIXER CONFIGURATION). If KEEP is not selected the settings will be initialized. When you make the change to the clock, an appropriate popup message appears, telling you what is about to happen (either the mixer will reboot, or the data will be initialized). Press ENTER to carry on with the operation or a cursor key to cancel it. WARNING Whichever option you select here, remember that changing the clock source and/or frequency may produce "thumps" and noise which may cause damage to your hearing and the monitoring system, etc. Turn down the levels of all such equipment before making the change to the clock settings. 56 TASCAM DM-4800 User's Manual