Clock Jitter
Clock jitter is variation in the timing of clock edges, expressed in units of time.
Figures may use femtoseconds, picoseconds or nanoseconds. RMS and peak-to-peak results are different statistics, and the measurement bandwidth determines which timing variations are included.
Clock Jitter — Upscaler
For an upscaler, jitter describes the specified internal clock or output timing. Keep the clock or output measurement point and processing mode attached to the figure.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.
Clock Jitter — SACD Transport
For an SACD transport, jitter describes its internal audio clock or a named digital output. Keep each stated output and operating condition distinct; a built-in DAC input-receiver figure is a different measurement.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.
Clock Jitter — USB Reclocker
For a USB reclocker, jitter describes the specified clock or regenerated signal timing. Identify the measurement point; USB signal timing and a downstream converter’s sample clock are different observations.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.
Clock Jitter — Music Server
For a music server, jitter describes its internal audio clock. A digital-interface receiver or external reference-clock specification is a different measurement.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.
Clock Jitter — DAC
For a DAC, jitter describes its internal audio clock. Input-receiver jitter and jitter rejection describe different parts or behavior of the converter.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.
Clock Jitter — Streamer
For a streamer, jitter describes its internal audio clock. An interface specification or a connected external clock’s figure does not establish the streamer’s internal clock jitter.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.
Clock Jitter — External Clock
For an external clock, jitter describes the clock signal at its output. The connected component can have its own clock-recovery behavior; its resulting jitter is not the same measurement.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.
Clock Jitter — CD Transport
For a CD transport, jitter describes its internal audio clock or a named digital output. Retain the output connection when specified; coaxial, optical and other output measurements are not interchangeable.
Compare the same jitter statistic and integration bandwidth, preserving any upper limit. Clock-frequency accuracy in parts per million and jitter attenuation in decibels are different quantities.