Patent ID: 8125300

Claim:
An electric filter comprising: a band-pass filter that comprises a track with acoustically coupled electroacoustic transducers; and a band-stop filter that is electrically connected to the band-pass filter and comprises at least one electroacoustic series element and at least one electroacoustic parallel element, wherein the at least one electroacoustic series element is connected in series to at least one of the electroacoustic transducers of the band-pass filter, wherein the band-stop filter comprises a shunt arm in which the at least one electroacoustic parallel element is arranged, wherein a resonance frequency and an anti-resonance frequency lie outside a passband of the band-pass filter in at least one of the electroacoustic elements of the band-stop filter, wherein the filter further comprises a first signal path and a second signal path, wherein a series circuit of a first series element of the band-stop filter and a first transducer of the band-pass filter is arranged in the first signal path, wherein a series circuit of a second series element of the band-stop filter and a second transducer of the band-pass filter is arranged in the second signal path, and wherein the first and the second series elements of the band-stop filter are acoustically coupled.