cxa1563m Sony Electronics, cxa1563m Datasheet - Page 11

• Manufacturer Part Number: cxa1563m
• Description: Dolby B-c Type Noise Reduction System With Built-in S Type Switch
• Manufacturer: Sony Electronics

4) Reference level
5) MPX Filter
6) Notes on Operation
The CXA1563M/S Dolby level is –6dBm (388mVrms), and is measured at the recording output pin (REC
OUT) in the NR OFF mode. The reference level of the recording input pin (LINE IN), playback input pin (PB
IN) and line output pin (LINE OUT) are defined as the levels which provide Dolby level at the recording output
pin in NR OFF mode.
The CXA1563M/S provides an MPX (FM multiplex) filter ON/OFF function.
Connect the MPX filter between MPX IN (Pins 4 and 21) and MPX OUT (Pins 5 and 20). In MPX ON mode,
the line input signal is fed to the NR processor via the MPX buffer amplifier and MPX filter. In MPX OFF
mode, the signal bypasses the buffer amplifier and filter, and is fed directly to the NR processor. The MPX
buffer amplifier gain is 10dB. The gain from LINE IN to LINE OUT is 19dB, and from MPX IN to LINE OUT it
is 13dB, for a deviation of 6dB. This means that if a filter with insertion loss of 4dB is used, there is no
fluctuation between MPX ON and MPX OFF.
If the CXA1563M/S is used without being connected to the CXA1417S/Q encoder unit, SIN (Pins 8 and 21)
must be connected to GND for dual power supply, and to VCT for single power supply. There is a risk of
misoperation if the SIN pins are left open during use.
– 11 –
CXA1563M/S