Room acoustics simulator

An apparatus for simulating acoustic reverberation comprising:

• an analog transversal filter means having analog inputs and analog outputs and responsive to digital control delay and gain weighting parameters;
• analog signal processing means coupled to said outputs of said transversal filter means and responsive to digital control delay and gain weighting parameters for producing a high echo density echo transient;
• means coupled to said transversal filter means and to said analog signal processing means for computing and generating digital control parameters;
• and
• means coupled to said analog outputs of said transversal filter means and of said analog signal processing means for summing analog signals representative of acoustic reverberation.

A method for generating an electronic simulation of acoustic reverberation comprising:

• applying a direct analog signal to a sampled time finite impulse response signal processing means having a digitally programmable delay line means and gain weighting means to produce an analog output signal representative of a preselected number of early echoes;
• applying said early echoes output signal to an analog comb filter having digitally programmable delay line means and gain weighting means, the output of which is applied to an all pass section to produce a delayed analog output signal representative of a high echo density echo transient;
• and
• combining said direct signal, said discrete echo signal and said echo transient signal into a composite analog output signal representative of reverberation.

A method for generating an electronic simulation of acoustic reverberation comprising:

• applying a direct analog signal to a sampled time finite impulse response signal processing means having a digitally programmable delay line means and gain weighting means to produce an analog output signal representative of a preselected number of early echoes;
• applying said direct analog signal to an analog comb filter having digitally programmable delay line means and gain weighting means, the output of which is applied to an all pass section to produce a delayed analog output signal representative of a high echo density echo transient;
• and
• combining said direct signal, said early echo signal and said echo transient signal into a composite analog output signal representative of reverberation.

An apparatus for generating an electronic simulation of acoustic reverberation comprising:

• a sampled time finite impulse response signal processing means having an analog signal input, an analog signal output, an analog signal path means with preselectable delay means and gain weighting means coupling said analog signal input to said analog signal output, and digital signal input means operative to preselect finite impulse response delay and gain weighting;
• a sampled time comb-type signal processing means having an analog input which is coupled to said analog signal output of said finite input response signal processing means, said comb-type signal processing means further having an analog signal output, an analog signal path means with preselectable delay means and gain weighting means coupling said analog signal input to said analog signal output, and digital signal input means operative to preselect comb delay and gain weighting;
• a sampled time all pass signal processing means having an analog signal input which is coupled to said analog output of said comb means, said all pass means further having an analog signal output, and an analog signal path with preselected all pass delay and gain weighting;
• and
• a summer coupled to the analog signal output of said all pass means and said finite impulse response means for propagating a discrete number of selected early reflections and a high echo density representation of reflections following said early reflections, thereby simulating acoustic reverberation of an enclosure.