Recording Media; Sampling Rate; Word Clock Synchronization; Bit Depth - Sound Devices 664 User Manual And Technical Information

664 User Guide and Technical Information

Sampling Rate

The 664's digital audio recorder can record at the following sampling rates:
• 44.1 kHz
• 47.952 kHz
• 47.952 kHz "F" (fi les stamped 48 kHz)
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.

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
external 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 fi les, the 664 records either 16 or 24 bit fi les. Bit depth is selected from the Setup
Menu item RECORDER > Bit Depth.

Bit Depth and Dynamic Range

Bit depth defi nes 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 removable CompactFlash (CF) and SD/SDHC/SDXC (SD) cards. The 664 can write
to one or both of these cards at the same time.
The SD card is inserted with the bott om of the card (the side with metal contacts visible) facing toward
the front of the 664. Push until it clicks. To remove, push in again to release the spring-loaded connec-
tor, 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) fac-
ing the rear of the 664. The fi nal few millimeters of insertion require light force. To remove the CF card,
grip it fi rmly and pull it out.
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v. 1.0 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
• 48 kHz
• 48.048 kHz
• 48.048 kHz "F" (fi les stamped 48 kHz)
The current Sample Rate is displayed on the Main Screen.