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Recording level
An integrated, electronic control automatically adjusts the input sensitivity of the DMM 4650’s (Mic, Line,
Rec. Inp) inputs. This level setting remains unchanged, until the question “Select new recording level?”
is answered by using the soft key “y=yes” before starting a new recording. By using a short test signal
marks the new setting of the control which is automatically stored. Pressing the soft key “ok” exits the
recording level menu.
Adjusting the recording level only becomes necessary when the connected signal source is changed or
major level changes occur.
Remote recording
It is possible to activate a recording via one of the control inputs (ports A .. D). An example given in the
list of factory sequences (S29, S30) on the pages 40-41. The message defined within the sequence is
automatically erased before the new recording starts. The example employs an indication lamp for start
recording (= deleting end) and the maximum recording time is set to 10 seconds.
Adjusting the recording level corresponds to the description in the previous paragraph. The message’s
audio quality setting stays unaltered as well. The priority number of the sequence gets copied to the priority
of the message.
Audio quality, recording duration
Prior to recording a message, “recording type” is shown on the display. The cursor keys are used to alter
the audio cutoff frequency (16 kHz, 8 kHz, 4 kHz) and the signal quality (CD = 16 bit linear, long = 8 bit,
µ-Law). The factory default setting is “8 kHz long” for all messages. The newly set audio quality is
maintained and individual adjustment for each message is possible.
Table for recording time (minutes) versus audio quality and installed sound memory extension (NR 90205).
Accuracy CD long*
bandwidth 4 kHz 8 kHz 16 kHz 4 kHz 8 kHz 16 kHz
without NR 90205 2 min 1min 0,5 min 4 min 2 min 1 min
1x NR 90205 4 min 2 min 1 min 8 min 4 min 2 min
2x NR 90205 6 min 3 min 1,5 min 12 min 6 min 3 min
3x NR 90205 8 min 4 min 2 min 16 min 8 min 4 min
* The specified times for the"long" recording mode are minimum values since the active data reduction
recognizes pauses in the audio signal. Pauses are defined as passages where the signal level drops -70
dBu below full modulation.
Message memory extension
It is possible to extend the sound memory capacity of the appliance by incorporating up to three additional
plug-in boards (extension kit NR 90205). The corresponding recording times are specified in the table
above. The flash memories have to be formatted after insertion (see menu “system setup” > “format
flash”).
Asterisk (*) behind message duration
An asterisk * behind the message recording time display signals that the corresponding data has been
corupted. The error is shown by the blinking Power-LED. In case you decide that the audio quality is
sufficient, after listening to the recording, you have to enter the menu “confirming” (page 13) to delete the
*-sign. If the result is not tolerable, the only solution is re-recording the message. To omit the blinking
Power-LED you have to acknowledge error no. 14 in the “self-test” menu (page 29).
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