Clock synchronization in a master-slave communication system

A method in a slave communication device, the method comprising:

• receiving a signal comprising unencoded digital content and an embedded master clock signal;
• sampling the signal at a sampling frequency;
• determining a number of occurrences of pulses having substantially the same pulse width;
• estimating a frequency of the embedded master clock signal based on the number of occurrences of pulses having substantially the same pulse width;
• and
• extracting the digital content by processing the signal at the estimated frequency.

A slave communication device comprising:

• a receiver circuit configured to receive a signal including unencoded digital content and an embedded synchronization signal;
• a sampling circuit coupled to the receiver circuit, the sampling circuit having a sampling frequency that exceeds an expected frequency of the synchronization signal and configured to determine a characteristic of the signal;
• a frequency determination circuit coupled to the sampling circuit, the frequency determination circuit configured to determine a frequency of the synchronization signal based on a number of occurrences of the characteristic of the signal;
• and
• a content processing circuit coupled to the frequency determination circuit and the receiver circuit, the content processing circuit configured to extract the unencoded digital content according to the determined frequency.