Bryston BDC1 CD player

Bryston BDC1 CD player

The Bryston BCD-1 is a State-of-the-Art Redbook CD player using fully discrete analog Class-A proprietary Bryston circuits, a quality Drive, and a 192K/24Bit Crystal DAC.
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.

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.

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.

Bryston BDC1 CD player