Dolby Installation Guidelines | Installation Issues |
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3.2.2Dolby Digital
The amount of delay added by the Dolby Digital encode/decode process varies depending upon the sample rate being used. The table below shows the minimum delay values for encoding. The DP569 allows for the encoding delay to be increased to any value between the minimum value and 450 ms. The decode latency values are fixed, dependent on the bitstream detect mode of the DP562. The encoding delays are correct for v1.22 of the DP569 software. These are likely to change in later versions.
Table
Sample | DP569 Minimum | DP562 Latency in | DP562 Latency in |
Rate | Coding Delay | Disabled/Reference Detect | Silent Switch Mode |
48 kHz | 179 ms | 32 ms | 36.6 ms |
44.1 kHz | 195 ms | 35.7 ms | 42.8 ms |
32 kHz | 268 ms | 48.4 ms | 58.3 ms |
3.2.3Dolby E
The Dolby E encoding and decoding processes each add one frame of delay to the audio. The frame length is that of the incoming video reference signal. If the DP572 is in Program Play mode, then the decoding delay will vary depending on the rate of the incoming Dolby E bitstream.
The Dolby E units also have a PCM delay output. This can be used to route the PCM input to the PCM output adding the same delay as is being added by the Dolby E encode process. This can be used to keep a pair of
3.3Setup and Calibration
To allow correct monitoring of the encoded audio, the DP562 includes adjustments for settings such as analog output level trims and surround delays. For details of how these should be set, refer to the user manual.
The DP563 requires calibration with the studio’s operating level. For details of how to perform this calibration, refer to the user manual.
The DP570 has different setup options depending on whether the Cat. No. 548 Analog Option Card is fitted. With the analog board fitted the setup options are similar to the DP562. However the DP570 allows for multiple sets of speakers for which level trims can be assigned separately. The DP570 also includes EX decoding and can therefore support up to 7.1 speaker setups. For full details of setting up these speakers please refer to the user manual.
