Sound Devices 664 - Manual (Page 35)

The sampling rate of the digital recorder is set from Setup Menu item RECORDER > Sample Freq. See
Time Code section for details of “F” modes. The current Sample Rate is displayed on the Main Screen.
Word Clock Synchronization
By default the 664 recorder uses its own internal clock to generate its sampling rate. The BNC Word
Clock input and Word Clock output on the rear of the 664 can be used to clock the 664 from an exter-
nal word clock signal or to synchronize external audio devices to the 664’s word clock.
To synchronize the 664 to an external word clock signal, connect the word clock signal to the
Word Clock Input BNC on the rear of the 664 and change TIMECODE/SYNC > Sync Reference to
Word Clock.
When the 664 is locked to external word clock, it is indicated on the Main Screen:
When Setup Menu item TIMECODE/SYNC > Sync Reference is set to Word Clock, but no valid ex-
ternal word clock is present, it will be indicated on the Main Screen:
The 664 only accepts word clock signals between 44.1 kHz and 48.048 kHz.
Bit Depth
When recording WAV files, the 664 records either 16 or 24 bit files. Bit depth is selected from the
Setup Menu item RECORDER > Bit Depth.
Bit Depth and Dynamic Range
Bit depth defines the digital “word length” used to represent a given sample and correlates to the
maximum dynamic range that is represented by the digital signal. Larger bit depths accommodate
more dynamic range. Sound Devices recommends 24-bit recording for all critical production.
Recording Media
The 664 records to approved removable CompactFlash (CF) and SD/SDHC/SDXC (SD) cards. The
664 can write to one or both of these cards at the same time. Visit www.sounddevices.com/approved for
an up-to-date list of tested and approved cards.
The SD card is inserted with the bottom of the card (the side with metal contacts visible) facing
toward the rear of the 664. Press until it clicks. To remove, push in again to release the spring-loaded
connector, then pull the SD card out.
The CF card is inserted with the top of the card (the side with the manufacturer’s branding label)
facing the rear of the 664. The final few millimeters of insertion require light force. To remove the CF
card, grip it firmly and pull it out.
If the CF card is oriented correctly, it will slide in easily until only a few millimeters are protruding. If the
CF card is oriented incorrectly, it will slide in easily until over 1 cm of the card is still protruding.
664 User Guide and Technical Information
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