Method of simulating a room and/or sound impression

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
1a of the drawing shows a possible method of determining the room impulse response.
A measuring signal is radiated at the location of the sound source and is received at the listening location by means of a measuring microphone.
The room impulse response is obtained from the received signal.
If an impulse is used as the measuring signal whose duration is equal to a period of the double frequency of the upper frequency limit of the audio signal range, the received signal is equal to the room impulse response h(t).
Since the signal-to-noise ratio is low in this method, a longer measuring signal is preferred in the practical application and the room impulse response is determined by calculation.
The binaural room pulse response which is required for the reproduction through headsets is obtained by placing the measuring microphones into the auditory meatuses of a test person for whom the room impulse response is to be determined.
Subsequently, the impulse response for the system loudspeaker-room-ear is measured and then the impulse response for the system headset-ear is measured.
The obtained impulse responses are transformed into the frequency domain, the transformed functions are divided and the quotient is retransformed into the time domain.
When this procedure is carried out for both ears, a binaural room impulse response is obtained which is composed of a right room impulse response and a left room impulse response.
FIG.
1b of the drawing is a diagram showing the sequence of method steps in one of the two room impulse responses determined as described above.
The room impulse response h(t) is conducted to the divider 1 in order to carry out the division into the direct sound content d(t) and the reverberation content r(t).
The reverberation content r(t) also includes all individual reflections of the measuring signal emanating from the room walls.
The room impulse response is by nature a continuous time signal and is digitalized for processing, so that h(t), d(t) or r(t) become h(n), d(n) or r(n), respectively