Bryston BCD 1 User Manual

BRYSTON BCD-1  
BCD–1 CD PLAYER  
THE EVOLUTION CONTINUES  
SonIc SuPERiORiTY  
ADVANTAGE  
The advantage of an all in one box solution for a CD Player  
(as opposed to a separate outboard DAC and Drive) is the  
elimination of jitter. For optimum performance the Drive  
and DAC must use the same MASTER CLOCK. If the  
clock signal of the drive is not synchronized with the clock  
signal from the DAC then jitter develops.In external DACs  
the digital input must be re-clocked in order to reduce the  
jitter. Jitter is defined as mistiming of the digital signal.The  
timing of all those ones and zeros is of extreme importance.  
It isn’t enough to get the bits right; those bits have to be  
converted back into music with the same timing reference  
as when the music was first digitized. These timing errors  
(jitter) are the bane of quality audio. With the Bryston  
CD player the master clock and the drive are synchronized  
perfectly to eliminate any possibility of jitter affecting the  
sound quality of the player.  
Over-sampling is when the samples are re-read (2x, 4x, 8x,  
etc.) to create a new sampling frequency. The new samples  
are then run through an interpolation filter to create a more  
analog-like waveform. The output of this process is a very  
sensitive analog signal and it is critical that the timing of  
this process is very closely controlled by a low jitter clock.  
DAC chips also require a very clean digital power supply  
if they are to function at their optimum. Noise on the  
digital supply may cause added jitter, noise, and distortion.  
Incorrect circuit trace routing of the digital power supply  
or ground may introduce digital noise into the analog  
circuits. This digital power supply is provided from a  
separate closely regulated and filtered source. The DAC  
also requires a high quality analog power source because the  
analog signal is at its lowest magnitude when it enters and  
leaves the DAC. As a result, any added noise or distortion  
will be greatly amplified by later stages. Again a separate,  
heavily regulated and filtered power supply with carefully  
routed grounds is provided. Finally, if a digital trace, signal  
or power, is routed in a layer above or below an analog trace  
it can induce noise via capacitive coupling. Careful trace  
routing eliminates these problems and provides the extra  
dB’s of noise and distortion reduction which separates good  
from outstanding equipment. This attention to detail with  
the power supplies is one of the reasons for the superior  
sound of the BCD-1 Bryston CD Player.  
BRYSTON DAC  
The DAC integrated circuit (chip) provides the conversion  
of the digital signal to the analog domain.The chip used in  
the BCD-1 CD Player is a Crystal CS4398. The CS4398  
is a hybrid multi-bit delta-sigma DAC. This is a rather  
tongue-twisting description that refers to an advanced  
generation chip using a combination of several different  
methods to optimize the conversion process. This DAC  
uses a process to over-sample the digital input 128 times.  
3
PerForMAnce WIthout COMPROMiSE  
DISCRETE CLASS-A ANALOG STAGE  
Getting the Digital side of the equation correct is only  
the start. Once the signal leaves the DAC it is buffered  
and increased in strength by operational amplifiers. In  
the Bryston BCD-1 CD Player these are constructed  
from discrete devices (individual transistors, resistors, and  
capacitors) instead of the commonly used integrated circuits.  
The use of discrete devices allows the design of a circuit  
that exactly matches the needs of the DAC. The use of  
integrated circuits always involves compromises since they  
are designed as general-purpose devices. Discrete devices  
also allow for more powerful outputs from operational  
amplifiers since the heat from the output driver transistors  
is separated from other devices. In an integrated circuit op  
amp this heat can affect the rest of the circuitry since it is  
all on one chip.  
HAND ASSEMBLED WITH CARE  
Bryston hand assembles and individually tests each and  
every product we manufacture. We exclusively use only the  
finest components in our products, such as 1% metal-film  
resistors, polystyrene capacitors, and hand selected and  
matched transistors, in order to reduce noise and distortion  
to the absolute minimum. Bryston applies techniques and  
employs custom materials in our everyday construction  
of electronic equipment that are more typically utilized  
by military and aerospace industries. Our traditional  
adherence to the use of proprietary parts, sophisticated  
construction, and refined testing techniques, guarantees  
that your Bryston CD Player will perform superbly,without  
any problems, for many, many years. It also prevents any  
unit-to-unit variance which inevitably is the result of any  
mass produced product.  
Discrete devices also allow specific matching of important  
characteristics such as input and output impedances based  
on the specific in-circuit requirements.Discrete operational  
amplifiers can also be designed to more closely match their  
power source leading to additional reduced distortion and  
noise. Discrete devices can be tested very closely to meet  
specific tolerances and can be matched against each other  
when a desired performance design is critical. Circuits can  
be and are designed to require closely matched devices  
for optimum performance. Integrated circuits have large  
numbers of components on one chip and it is not practical  
to do more than high-level sorting of device characteristics.  
Bryston does sorting and grading with its DAC chips but  
does so to a much finer level with the discrete devices,  
which leads to superior sound quality.  
PERFORMANCE WITHOUT COMPROMISE  
With today’s increased clarity and dynamic range in  
recordings you need equipment that not only equals but  
surpasses the parameters of the most demanding material  
available. The Bryston BCD-1 CD Player is without peer  
Bryston Ltd. P.O. Box 2170,
Ontario Canada K9J 7Y4 1-

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