CLOCK REGENERATION CIRCUIT

WIPO Patent Application WO/1998/057470

A1

A clock regeneration circuit for regenerating a clock signal for demodulating data from an AM data multiplex modulated signal where digitally modulated signals are multiplexed in the same frequency band as those of an amplitude-modulated signal at the same time. The carrier for an amplitude-modulated signal is extracted from an AM data multiplex modulated signal where digitally modulated signals are multiplexed in the same frequency band as those of the amplitude-modulated signal at the same time through a band-pass filter (1), and the oscillation frequency of a voltage-controlled oscillator (5) is controlled by the output of a phase comparator (3) through a loop filter (4). The oscillation output of the voltage-controlled oscillator (5) is supplied to a direct digital synthesizer (6) and the phase of the carrier extracted through the band-pass filter (1) is compared with the phase of the output of the direct digital synthesizer (6) by means of the phase comparator (3). The oscillation output of the voltage-controlled oscillator (5) is then synchronized with the carrier for the amplitude-modulated signal to produce a clock signal for demodulating data.

JPH0677338	[Name of device] AM electronically tuned radio
JPS58145219	RECEIVER

TADA SHUNICHI (JP)
SHIRAISHI KENICHI (JP)

PCT/JP1998/002553

December 17, 1998

June 10, 1998

Click for automatic bibliography generation  

KENWOOD CORP (JP)
TADA SHUNICHI (JP)
SHIRAISHI KENICHI (JP)

H03J7/06; H04J9/00; H04L7/06; H04L27/06; H04L27/22; H03L7/18; (IPC1-7): H04L27/22; H04J9/00

JPH09326836A	1997-12-16
JPH1022974A	1998-01-23
JPH1022956A	1998-01-23
JPH09102775A	1997-04-15
JPH07202965A	1995-08-04
JPH0758636A	1995-03-03
JPH05122063A	1993-05-18

See also references of EP 0989706A4

Okabe, Masao (Fuji Building 2-3, Marunouchi 3-chom, Chiyoda-ku Tokyo, JP)

View/Download PDF      PDF Help

Previous Patent: RECEIVER FOR INDEPENDENT SIDEBAND SIGNALS

Next Patent: ABSOLUTE PHASING CIRCUIT