Level Adjustment, Record Level; Remote Recording; Audio Quality, Recording Time; Message Memory Extension - Dynacord DMM 4650 Owner's Manual

Recording level
An integrated, electronic control automatically adjusts the input sensitivity of the DMM 4650's (Mic, Line, Rec. lnp)
inputs. This level setting remains unchanged, until the question "Select new recording level?" is answered by using
the soft key ')/=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 maxi-
mum 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 (1 6 kHz, 8 kHz, 4 kHz) and the signal quality (CD = 16 bit linear, long = 8 bit, p-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
bandwidth
without NR 90205
1 x NR 90205
2x NR 90205
3x NR 90205
*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 modu-
lation.

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).
CD
4 kHz 8 kHz
2 min 1 min
4 min 2 min
6 min 3 min
8 min 4 min
16 kHz 4 kHz
0,5 min 4 min
1 min 8 min
1,5 min 12 min
2 min 16 min
14
long*
8 kHz 16 kHz
2 min 1 min
4 min 2 min
6 min 3 min
8 min 4 min