Patent ID: 8638947

Claim:
An apparatus for stereophonizing a mono signal, wherein said apparatus is configured to provide: (a) evaluation of manually or metrologically ascertained angle φ between sound source and microphone main axis in combination with (aa) an arbitrarily or algorithmically determined fictitious opening angle α, which adjoins the microphone main axis on the left, is not an element of a region around zero or equal to zero, and for which, if the angle φ is positive, a condition is satisfied that the angle φ is less than or equal to the angle α; (bb) an arbitrarily or algorithmically determined fictitious opening angle β, which adjoins the microphone main axis on the right, is not an element of a region around zero or equal to zero, and for which, if the angle φ is negative, a condition is satisfied that the absolute value of the angle φ is less than or equal to the angle β; (cc) manually or metrologically determined directivity pattern of the mono signal to be stereophonized, representable in polar coordinates; the apparatus comprising: (b) a first circuit element for calculating a gain factor P(α), which is dependent on the angle φ, on the angle α and on the directivity pattern of the mono signal to be stereophonized; (c) a second circuit element for calculating a gain factor P(β), which is dependent on the angle φ, on the angle β and on the directivity pattern of the mono signal to be stereophonized; (d) a third circuit element for calculating a delay time L(α), which is dependent on the angle φ, on the angle α and on the directivity pattern of the mono signal to be stereophonized; (e) a fourth circuit element for calculating a delay time L(β), which is dependent on the angle φ, on the angle β and on the directivity pattern of the mono signal to be stereophonized; wherein the apparatus is configured for: (f) direct use of the mono signal to be stereophonized as a mid signal; (g) delay of the mono signal to be stereophonized by the delay time L(α) and amplification of the delayed signal by the gain factor P(α); or alternatively: amplification of the mono signal to be stereophonized by the gain factor P(α) and delay of the amplified signal by the delay time L(α); (h) delay of the mono signal to be stereophonized by the delay time L(β) and amplification of the delayed signal by the gain factor P(β); or alternatively: amplification of the mono signal to be stereophonized by the gain factor P(β) and delay of the amplified signal by the delay time L(β); (i) addition of the signals obtained under (g) and (h) in order to obtain a side signal; and (j) stereo decoding of the mid and the side signal into a stereo signal.