Philips manual SM30 System Specification, General

15 SM30 SYSTEM SPECIFICATION

GENERAL

The specification relates to a Control Centre with corresponding modules.

MICROPROCESSOR HARDWARE
-	EEPROM data storage time	: > 10 years
RECORDED MESSAGE MODULE
-	data retention	: > 30 days
-	audio bandwidth	: 320 - 6000 Hz
-	max. total recording time	: 65 seconds
-	max. number of messages	: 4
-	microphone phantom power supply voltage	: 12 V DC

AUDIO OUTPUTS

Music input to music output

-gain:

	control range	: > 60 dB (2 dB steps)
	mute	: > 80 dB
-	input level	: > 150 mV

-output level symmetrical:

nominal	: 0 dBV
maximum	: +12 dBV

-amplifier output distortion:

	THD at nominal level	: 0.1%
	THD at max.output	: 0.3%
-	amplifier S/N output at nominal level	: > 80 dB (flat)

Call Station or Microphone input to call output

-output level symmetrical:

nominal	: 0 dBV
maximum	: +12 dBV

-Microphone Input Module:

	input level	: > 1.5 mV
	frequency response	: 50 - 15000 Hz (± 2 dB)
	signal-to-noise ratio	: 68 dB (flat)
-	Call Station:
	input level	: > 84 db (SPL)
	frequency response	: 440 - 12500 Hz (± 3 dB)
	signal-to-noise ratio	: 58 dB (flat)

-amplifier output distortion:

	THD at nominal level	: 0.1%
	THD at max.output	: 0.3%
Music and call Output Impedance		: < 50 Ω
-	at 1 kHz

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