EP 0546619 A3 19940420 -
Publication
Application
Priority
US 80535691 A 19911209
Abstract (en)
[origin: EP0546619A2] A circuit for doubling and mixing low frequency audio signals includes an input for receiving an audio signal having a substantially wide frequency range, a circuit coupled to said input means for separating signal components in a low frequency band of the audio signal from the wide frequency range thereof, a frequency doubler coupled to the separating circuit for doubling the frequencies of the signal components in the low frequency band, and a mixer for mixing the frequency doubled signal components with the input audio signal, whereby the signal components in the low frequency band now also appear one octave higher.
IPC 1-7
IPC 8 full level
H04R 3/04 (2006.01); H04R 5/04 (2006.01); H04S 1/00 (2006.01)
CPC (source: EP)
H04R 3/04 (2013.01); H04R 5/04 (2013.01); H04S 1/00 (2013.01)
Citation (search report)
- [Y] US 3710146 A 19730109 - OHSAWA M
- [YA] GB 2153187 A 19850814 - LINN PROD LTD
- [A] US 4734591 A 19880329 - ICHITSUBO IKUROH [JP]
- [A] US 4607381 A 19860819 - SHIMIZU YOSHIO [JP]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0546619 A2 19930616; EP 0546619 A3 19940420; EP 0546619 B1 19980923; DE 69227091 D1 19981029; DE 69227091 T2 19990520; JP H05328481 A 19931210
DOCDB simple family (application)
EP 92203748 A 19921203; DE 69227091 T 19921203; JP 32672992 A 19921207