Philips SM30 User Manual download pdf (Page 46)

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

- at 1 kHz : < 50 Ω

GB/SM 30 user manual 5/26/98 10:18 AM Page 44

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Philips SM30 User Manual Page 46