| (19) |
 |
|
(11) |
EP 0 546 619 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
20.04.1994 Bulletin 1994/16 |
| (43) |
Date of publication A2: |
|
16.06.1993 Bulletin 1993/24 |
| (22) |
Date of filing: 03.12.1992 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB |
| (30) |
Priority: |
09.12.1991 US 805356
|
| (71) |
Applicant: Philips Electronics N.V. |
|
5621 BA Eindhoven (NL) |
|
| (72) |
Inventor: |
|
- Schott, Wayne,
c/o Int.Octrooibureau B.V.
NL-5656 AA Eindhoven (NL)
|
| (74) |
Representative: Groenendaal, Antonius Wilhelmus Maria et al |
|
INTERNATIONAAL OCTROOIBUREAU B.V.,
Prof. Holstlaan 6
NL-5656 AA Eindhoven
NL-5656 AA Eindhoven (NL) |
|
| |
|
| (54) |
Low frequency audio doubling and mixing circuit |
(57) 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.