Tascam DM-24 Owner's Manual

Also see for DM-24: User guide Basic guide Quick start guide Basic guide Installation information

Contents

3 – System-wide options—DIGITAL screens26 TASCAM DM-24 Reference ManualOut of range clock signalsWhen setting the clock, the sampling frequencyreceived can be ±6% of the stated nominal value.When in use, the frequency can be ±7% of the statedvalue. This allows a digital device which has avarispeed feature to be used as the word clock sourcefor the DM-24.If the selected clock source goes out of range, theDM-24 mutes, the currently-selected clock indicatorflashes, and a message appears on the display.The DM-24 reports the out-of-range clock frequencyat a range of ±9.9% relative to the stated frequency,but mutes at 7.0% or over.Press the ENTER key to dismiss the popup message,change to the CLOCK screen, and correct the errorcondition (by selecting another clock source, or byre-selecting the clock if it has come back into range).The FORMAT screenThis screen allows you to see and work with the digi-tal audio inputs and outputs connected to the DM-24.The first part of this screen affects the digital inputs.Note that the I/O screen is used to determine whetherthe XLR connector or RCA pin jack is used for eachof these inputs.Type of DIGITAL IN connection Typically,these connectors will be used for base frequency dig-ital audio (44.1 k or 48 k). This is shown as NORMALon the display. However, if the DM-24 is in highsampling frequency mode, these inputs may be usedfor high sampling frequency inputs. There are twoways in which they can be used for high samplingfrequency; DUAL-LINE (where one AES/EBU cable isused to transmit one channel of high sampling fre-quency audio, hence two lines are needed for a stereopair) and HIGH-SPEED where the audio is transmittedat twice the usual speed, where one AES/EBU cableis used to transmit a pair of high sampling frequencysignals at high speed.Use the cursor, dial and ENTER key to set this value.If the DM-24 is set to an incompatible sampling fre-quency, a popup message appears.Other digital input parameters At normalbase sampling frequencies, the DM-24 is capable ofperforming sampling frequency conversion on theincoming data. This can be turned on or off individu-ally using the on-screen Fs CONVERT buttons.The MUTE DEFEAT checkbox allows the DM-24 toignore a status bit in some implementations of digitalaudio, which are otherwise satisfactory. If this isunchecked, when this audio is received, the inputmay be muted and the following messages may bedisplayed on screen: Not Audio data Digital In1 (byte 0,bit 1=1 of the channel status) or Source Fs unlocked(byte 0, bit5=1).Details of the digital audio data can be obtained froma popup produced by pressing the DETAIL button.Such information includes the format, type, emphasisstatus, etc.Digital output The assignments for the two digi-tal outputs are made using the I/O screen. The formatcan be changed between AES/EBU and SPDIF (theSPDIF option is meaningful at base sampling frequen-cies only) and details of the data can be obtainedfrom a popup produced by pressing the DETAIL but-ton. Such information includes the format, contents,emphasis status, word length, etc.Multi I/O settings These assignments are madein the I/O screen, and cannot be changed. However,the word length for each of the TDIF groups can beset (either 16bit, 20bit or 24bit) and the details can beviewed (DETAIL button). These details include TX/RXmode, sampling frequency, word length and empha-sis status, etc.Stereo out setup This allows the choice of theword length output from the stereo out as beingeither 24-bit data, 20-bit with noise shaping, or 16-bitwith noise shaping.