A subscriber device includes a long code generator and a modifier for generating a spread bit stream with a predetermined error pattern that is transmitted by a transmitter at the subscriber device to a base station. A base fits between the mattress and box spring of a bed. Furthermore, the cooking appliance may then automatically cook the food product by controlling the cooking appliance according to the selected cooking instruction set. The vibration can generate a fluctuating pattern of refractive index in the thin film waveguide due to the modulating effect of the signal. The exhaust gas discharged from the bypass passage is blown to the front end surface of the exhaust gas purification means in a lateral direction of the front end surface, whereby particulate matter deposited in the front end surface of the exhaust gas purification means is blown off.