audio signal embellisher - signal restoration with stereo simulation

audio signal embellisher elektor january 1984 audio signal embellisher from an idea by J.F. Brange It is often unavoidable to have to connect an item of mono equipment that is rather less than hi-fi to a modern stereo installation. Although this may give some improvement in the resulting sound quality, the reproduction remains monaural (mono) invariably with a level of hum and noise which by present-day standards is unacceptable. We have designed a circuit which by hum suppression, stereo simulation, and dynamic noise limiting (DNL) gives a greatly enhanced performance. The stereo effect is created by splitting the audio spectrum into sixteen frequency bands which are fed alternately to the left and right-hand channels. Ever since the arrival of hi-fi audio equip- ment and the introduction of stereo, our aural senses have been spoilt to the point of addiction. Nowadays when we listen to ordinary monaural music, we soon feel there"s something missing. If in ad- dition the sound is ...