Title:
熱音響変換器
Document Type and Number:
Japanese Patent JP2008547300
Kind Code:
A
Abstract:
A thermo-acoustic transducer device (8) comprises a substantially hollow body (10) in which a thermo-acoustic element (11) is accommodated, and a heating control unit (2) coupled to the thermo-acoustic element (11) for controlling the temperature gradient of the element. The heating control unit (2) is arranged for being controlled by a control signal (Sm). The device further comprises a modulation unit (3) coupled to the heating control unit (2) for producing the control signal in response to an audio signal (Si). The modulation unit (3) may comprise a band pass filter unit (31) for selecting a frequency band of the audio signal (Si), a detector unit (32) for detecting the envelope of the band-pass filtered audio signal so as to produce the control signal (Sm), and a low-pass filter unit (33) for low-pass filtering the control signal (Sm).
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Inventors:
Artz Ronaldus M
Schobben Daniel W
Schobben Daniel W
Application Number:
JP2008517670A
Publication Date:
December 25, 2008
Filing Date:
June 20, 2006
Export Citation:
Assignee:
Koninklijke Philips Electronics N.V.
International Classes:
H04R23/00; H04R3/04
Attorney, Agent or Firm:
Susumu Tsugaru
Akihiko Miyazaki
Fueda Shusen
Akihiko Miyazaki
Fueda Shusen