What are BHJ, SHJ, THJ and PHJ?
BHJ is the engineering specification for encoding the W, X and Y direction signals into two channels. The two channels, called Left and Right, can then be transmitted using conventional stereo media before being decoded back into W, X and Y. The BHJ format has been designed to be mono and stereo compatible. In practice, BHJ is the only UHJ encoding that has been used for commercial record releases. For this reason UHJ has become a synonym for BHJ and UHJ is the symbol you will see on BHJ encoded LPs and CDs. SHJ specifies how W, X and Y can be encoded into 2.5 channels, called Left, Right and T, where the T channel is of reduced bandwidth (5 kHz). The original intention was to provide the reduced bandwidth channel in broadcasting by additional modulation of the 38 kHz sub-carrier. Presumably RDS, Minicall, etc, kills this possibility. THJ specifies how W, X and Y can be encoded into three channels called Left, Right and T. This is the “no-compromise” horizontal C-Format. PHJ specifies
================================== BHJ is the engineering specification for encoding the W, X and Y direction signals into two channels. The two channels, called Left and Right, can then be transmitted using conventional stereo media before being decoded back into W, X and Y. The BHJ format has been designed to be mono and stereo compatible. In practice, BHJ is the only UHJ encoding that has been used for commercial record releases. For this reason UHJ has become a synonym for BHJ and UHJ is the symbol you will see on BHJ encoded LPs and CDs. SHJ specifies how W, X and Y can be encoded into 2.5 channels, called Left, Right and T, where the T channel is of reduced bandwidth (5 kHz). The original intention was to provide the reduced bandwidth channel in broadcasting by additional modulation of the 38 kHz sub-carrier. Presumably RDS, Minicall, etc, kills this possibility. THJ specifies how W, X and Y can be encoded into three channels called Left, Right and T. This is the “no-compromise”
