sptbl["buthp"] = {     files = {        module = "buthp.c",        header = "buthp.h",        example = "ex_buthp.c",    },     func = {        create = "sp_buthp_create",        destroy = "sp_buthp_destroy",        init = "sp_buthp_init",        compute = "sp_buthp_compute",    },     params = {        optional = {            {                name = "freq",                type = "SPFLOAT",                description = "Cutoff Frequency.",                default = 1000            },        }    },     modtype = "module",     description = [[Highpass Butterworth filter]],     ninputs = 1,    noutputs = 1,     inputs = {        {            name = "input",            description = "Signal input."        },    },     outputs = {        {            name = "output",            description = "Signal output."        },    } }