The Mini Sampling Rate Converter (MSRC/PE) is the new miniature solution for interfacing between digital devices with different sampling rates. Its excellent performance and its ease-of-use make the MSRC suitable for many applications in both consumer and professional fields. The MSRC is also the ideal medium for cleaning up digital signals, like for instance, to remove jitter.
Instrucion for use
The MSRC is powered by a 9VDC AC/DC adapter which comes together with the MSRC.
- Check that the mains voltage as indicated on the adapter corresponds to your local mains supply. if not, consult your dealer. Eventually, the MSRC can be powered by any other 9VDC adapter if it can source 200 mA. The polarity of the DC power supply socket is shown on the backside of the MSRC.
- Insert the DC plug of the adapter in the DC power supply socket of the MSRC and plug the adapter in a mains socket. The MSRC is then switched on and at least one LED will burn.
Digital Audio Connections
The MSRC can be considered as the equivalent of a normal digital cable between a digital play-back device and a digital recording device. Only two digital connections have to be made:
- Connect the digital output (SPDIF format) of a play-back device (e.g. a DAT recorder) to the plug "DIGITAL IN" of the MSRC.
- Connect the digital input (SPDIF format) of a recording device (e.g. a CD-Recordable) to the plug "DIGITAL OUT" of the MSRC.
- Connect a TTL level Word Clock signal to the BNC connector if the output sample frequency of the MSRC/PE should be slaved to this frequency.
The MSRC is now installed and ready-to-use.
Selecting the output frequency
The slide-switch at the front side of the MSRC enables you select a output sample frequency of 44.1 kHz, 48 kHz or a slaving to an External Word Clock (continuous range from < 31 kHz to > 50 kHz). Put the switch in the desired position, and the output of the MSRC will generate a digital signal with this sample frequency, no matter what is the signal at the input.
The three LED's on the front side of the MSRC give you information about the status. The following combinations are possible:
- LED is burning; the MSRC is in lock, and the LED shows the output sampling frequency
- 3 LED's are burning: the MSRC is in lock, but is slaved to a External Word Clock different from the standard output sample frequencies (32, 44.1 or 48 kHz).
- 3 LED's are blinking at a low frequency (about once per second) : the MSRC is out-of-lock because there is no input signal or the input signal is not according to the specification. During the "off-period", one LED is burning weaker to indicate the current output sampling frequency.
- 1 LED is burning, 2 other LED's are blinking with a high frequensy: the MSRC detected a music track increment on the input signal (see further) and is passing this to the output signal. The continuous burning LED indicates the current output sample rate.
(Note: the text "Ext." above the first LED indicates actually a sample frequency of "32 kHz*).
Channel Status information (SCMS, Category code)
Besides the audio information, also Channel Status (C-bits) and User Channel (U-bits, see further) information is present in a digital audio signal. The Channel Status bits indicate the status of the digital signal as it is being generated by a digital audio device, in this case the MSRC.
The MSRC output Channel Status information contains the following information:
- Consumer/Professional C-bit: copied from the corresponding incoming C-bit.
- Audio/Non-Audio C-bit: copied from the corresponding incoming C-bit.
- Output sample frequency C-bits: determined by the position of the slide-switch (32/44.1/48 kHz).
- Emphasis C-bit(s) : copied from the corresponding incoming C-bit(s).
- Copy-bit, Category Code + L-bit: two case are possible:
- 1) if the Category Code of the input signal belongs to the categories Laser-Optical (CD, MD, ..) or Magnetic (DAT, DCC, .), the output Category Code of the MSRC is always "DAT" The Copy-bit and L-bit (indicating the generation status of the music) are set in such a way that a digital copy can always be made. Note: this is not conform to the Serial Copy Management System (SCMS).
- 2) in all other cases the Category Code, Copy-bit and L-bit are copied from the corresponding incoming C-bits.
User Channel information (track increment)
The U-bits are not converted from the input to the output, because it is impossible to convert this information between two sample rates. However, to enable automatic track increments on the recording devices, a track increment function is present: if the input of the MSRC comes from either a CD player or a DAT recorder, a track increment will be detected and translated to a DAT track increment in the digital output signal of the MSRC. This means that every recording device, which recognizes DAT track increments will be able to generate automatically track increments while recording. Nowadays, all DAT recorders and most DCC and CD-R recorders recognize DAT track increments.
In case the MSRC might come in a hang-up situation, you can reset the device by disconnecting the power supply for about 20 seconds.
Connector: XLR socket female
Signal: Balanced, 200 mVpp (minimum)
Word length: 20 bit (maximum)
Frequency: Range depends on output sample frequency (examples given)
- 12 - 45 kHz when the output is 32 kHz
- 15 - 62 kHz when output is 44.1 kHz
- 16 - 68 kHz when output is 48 kHz
Connector: XLR socket male
Signal: Balanced, 5 Vpp (approx.)
Word length: 20 bit
Frequency: 32 kHz, 44.1 kHz or 48 kHz sample frequency
External word clock input
Format: Word Clock
Signal: TTL level
Frequency: < 31 ... > 50 kHz
Total Harmonic Distortion+ Noise at 1 kHz: -112 dB (48 kHz -> 44.1 kHz)
Total Harmonic Distortion+Noise at 20 kHz: -98 dB (48 kHz -> 44.1 kHz)
Dynamic Range: 113 dB
PLL bandwidth : 0.5 Hz
Full Varispeed +/-12.5 is supported
Length: 111 mm
Width: 105 mm
Height: 36 mm
Power supply adapter
Input: 220 V 50 Hz or 115V 60 Hz (dependent on country)
Output : 9 VDC
product code: 3104 229 00040
October 17, 1995
Designed by PHILIPS ITCL DIGITAL TECHOLOGY