Duitse topkwaliteit, grotendeels handgebouwd in Herford


The CD 1210 R employs a fully programmable signal processor (DSP) which can process
digital signals in any conceivable way. For this reason it produces better oversampling
characteristics than are possible otherwise using ready-made commercially available chips.
Commercial oversampling filters are invariably designed to produce as flat a frequency
response as possible, without taking into account time-related characteristics, i.e. those
concerning transient response. The inevitable result is long pre- and post-echoes which can
seriously distort the listener’s perception of the music - especially where peak signals are
concerned.
Different types of filter - known as polynomial filters - are now available which exhibit perfect
transient signal handling. Unfortunately these filters show a slight drop in treble response at
20 kHz. The CD 1210 R makes use of one class of these filters - BEZIER polynomial filters - combined with an IIR filter in a three-stage oversampling process.
The result is a filter which produces no pre-echoes. The human ear is particularly sensitive
to pre-echoes for two reasons: on the one hand they never occur at all under natural
conditions, and on the other they are not masked by the main signal - as is the case with
post-echoes. This filter also has a flat frequency response, which is a considerable
improvement over other polynomial filters (e.g. cubic splines).
Since filters of such refinement cannot be purchased ready-made, the CD 1210 R utilises a
digital signal processor to fulfil this purpose.
Since the signal processor is completely programmable the CD 1210 R is not tied to a
particular filter type. As a result we have been able to give the machine a total of five
different filter types, each with a different sound character, ranging from the classic long
FIR filter to the BEZIER filter, with short FIR filters between the two.
Each of these filters can be activated directly via its own button on the machine’s front panel


Analog Out
The analogue output of the CD player supplies a fixed-level output signal. It is designed for connection to a pre-amplifier,
integrated amplifier or receiver with its own volume control


Optical digital output for connection to an external
digital/analogue converter.
Optional co-axial digital output.
RC input socket for connection to an "R"-series pre-amplifier,
integrated amplifier or receiver.
Interface for future system expansions
Standard-filter (long FIR-filter)
The long FIR filter is the standard oversampling filter used in digital technology.
Advantages: Extremely linear frequency response in the audible range, very high stop band
attenuation, linear phase, constant group delay.
Filter 1 (short FIR-filter)
The short FIR filter has similar characteristics to the long FIR filter, but very much lower
coefficient (160) and consequently considerably lower pre- and post-echoes. Advantages:
Extremely linear frequency response in the audible range, high stop band attenuation, linear
phase, constant group delay.
Filter 2 (IIR-filter)
This filter is a classic 8th order IIR filter. It exhibits absolutely no pre-echo effects, albeit a
slight tendency to post-echo. This is also a feature of natural instruments, and in any case
the post-echo is usually masked by the normal audible signal. Advantages: No pre-echo at
all, no treble loss, very high stop band attenuation.
Filter 3 (Bezier- / IIR-filter)
This combination circuit consists of three cascaded filters: a Bezier filter, an IIR filter and a
second Bezier filter. It represents a good compromise between transient response and
frequency response. Advantages: Virtually no pre-echo, minimal post-echo (in masking
range), relatively flat frequency response, no pronounced treble loss.
Filter 4 (Bezier filter) The Bezier filter is the ideal filter in terms of transient response, virtually no pre- or post echo, linear phase, slight treble roll-off at 20 kHz. Advantages: Optimum transient response,linear phase, constant group delay.


Specifications
Mechanism Professional, close-tolerance linear disc
mechanism with triple-beam LDGU optics, 780 mm
semi-conductor laser, 2 mW power
Wow and flutter Quartz-controlled, not measurable
Mechanical construction Rigid all-metal case, shielded sub-assemblies,
vibration de-coupled
Digital filters
Freely programmable signal processor with four
different filter types, 8-times oversampling and 56
bit resolution, FIR short, FIR lang, IIR Bezier,
Bezier IIR filters
D/A converter type Double differential mode. Two 1-bit Sigma-Delta
converters with 256-times oversampling
Noise shaping 4th order (ZSNS)
Analogue filter
Phase-linear Bessel filter
3rd order with 60 kHz limit frequency
Frequency response 2 Hz – 20 kHz
Distortion / intermodulation
< 0,002 %
Effective system dynamics 97 dB
Signal: noise ratio (A-weighted) 109 dB
Signal: noise ratio (unweighted) 106 dB
Channel separation 1 kHz / 10 kHz 106 / 100 dB
Digital output
Data format SP-DIF
1 x opto = 660 nm / -18 dBm
optional:1 x coax = 0,5 V / 75 Ohms
Analogue output nominal 2,6 V eff, 22 Ohms
Dimensions 7,5 x 44 x 39 cm
Weight 8 kg
Colours Black (9005), silver aluminium,
Chrome (Non-standard version)
Remote control Via R system or as non-standard version


Deze onderschatte topspeler is een audiofiel juweel, iconisch Dieter Rams (o.a. bekend van BRAUN) design, doet nauwelijks onder voor bijvoorbeeld een gemiddelde Accuphase


Aangeboden voor 475,- inclusief 3 maanden garantie. Nieuwprijs was circa 2000,-


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