Modifiers matching signal:

• directional,
• analog,
• actual,
• audible,
• auxiliary,
• external,
• abstract,
• acoustic,
• elementary,
• visual,
• natural,
• repetitive,
• seismic,
• high,
• pitched,
• clinical,
• everyday,
• defined,
• physiological,
• size,
• detectable,
• electrical,
• biological,
• binary,
• complex,
• difficult,
• driving,
• neural,
• false,
• regular,
• useful,
• remote,
• individual,
• larger,
• unwanted,
• resonant,
• localized,
• static,
• significant,
• typical,
• respiratory,
• measurable,
• undesired,
• tonal,
• private,
• local,
• logical,
• off,
• financial,
• endogenous,
• functional,
• moving,
• intrinsic,
• extracellular,
• nonverbal,
• standard,
• original,
• interactive,
• global,
• out,
• electromechanical,
• complicated,
• extra,
• special,
• light,
• outside,
• technical,
• weather,
• ancillary,
• audiovisual,
• noisy,
• internal,
• vital,
• informational,
• rapid,
• symbolic,
• informative,
• primitive,
• discrete,
• continuous,
• large,
• stationary,
• mental,
• behavioral,
• linguistic,
• abnormal,
• atomic,
• fast,
• subtle,
• structured,
• physiologic,
• cultural,
• social,
• slow,
• common,
• molecular,
• unique,
• temporal,
• metabolic,
• dynamic,
• auditory,
• chaotic,
• verbal,
• transient,
• single,
• typographical,
• related,
• simple,
• ionic,
• accessible,
• small,
• white,
• meaningful,
• stray,
• primary,
• costly,
• systemic,
• demographic,
• electromagnetic,
• unintentional,
• traditional,
• medical,
• percussive,
• biomedical,
• chemical,
• telegraphic,
• intracellular,
• critical,
• physical,
• insignificant,
• familiar,
• loud,
• nonrandom,
• plastic,
• alert,
• broadband,
• mechanical,
• peripheral,
• electronic,
• unpredictable,
• perceptible,
• basic,
• realistic,
• sensory,
• behavioural,
• electric,
• practical,
• harmonic,
• pedestrian,
• underlying,
• visible,
• interfering,
• sensorial,
• relevant,
• over,
• specified,
• world,
• identifiable,
• multiple,
• real,
• cellular,
• secondary,
• periodic,
• communicative,
• random,
• clear,
• environmental,
• developmental,
• diverse,
• objective,
• male,
• seasonal,
• negative,
• important,
• fixed,
• linear,
• wideband,
• diagnostic,
• exogenous,
• specialized,
• graphic,
• accidental,
• positive,
• hemodynamic,
• heterogeneous,
• graphical,
• extraneous,
• rhythmic,
• intermediate,
• vocal,
• normal,
• incoming,
• weak,
• intermittent,
• digital,
• pyrotechnic,
• level,
• additional,
• stereo,
• strong,
• perceivable,
• attractive,
• distinct,
• sexual,
• ambient,
• erroneous,

Simple categories matching typographical:

• ornament,
• signal,
• symbol,
• character,
• control,
• sign,