Method and modulator for modulating digital signal to higher fre

Details Method and modulator for modulating digital signal to higher fre Method and modulator for modulating digital signal to higher fre

1996-06-05

1997-12-23

Grimm, Siegfried H.

Modulators

Frequency shift keying modulator or minimum shift keying...

332103, 375298, 375303, 375308, H04L 2712, H04L 2720

Patent

active

057011060

ABSTRACT:
A method and modulator for modulating a digital signal to an analog intermediate-frequency signal. A baseband digital signal (I, Q) is taken to a digital-to-analog converter (71, 710) in which it is sampled at a certain sampling frequency (f.sub.in) and converted to an analog signal. The conversion produces a baseband signal (f.sub.sig) and signals (N*f.sub.in, f.sub.Ni) at multiples of the sampling frequency (f.sub.in). The sampling frequency is increased, advantageously according to a sigma-delta D/A conversion, and one of the signals (N*f.sub.in,f.sub.Ni) at multiples of the sampling frequency (f.sub.in), produced by the conversion, is selected as the output signal (f.sub.IF), advantageously a multiple (N*f.sub.in, f.sub.Ni) of the sampling frequency that is directly at the intermediate frequency or transmission frequency.

REFERENCES:
patent: 5091919 (1992-02-01), Kuisma
patent: 5123031 (1992-06-01), Kuisma
patent: 5124672 (1992-06-01), Kuisma
patent: 5191331 (1993-03-01), Karema et al.
patent: 5248972 (1993-09-01), Karema et al.
patent: 5311179 (1994-05-01), Vaisanen et al.
patent: 5313205 (1994-05-01), Wilson
patent: 5325396 (1994-06-01), Critchlow et al.
patent: 5331321 (1994-07-01), Mannonen
patent: 5446423 (1995-08-01), Bienz et al.
patent: 5473280 (1995-12-01), Ohnishi et al.
patent: 5491832 (1996-02-01), Malkamaki et al.
Morling, R.C.S. et al.: "The Design of a Sigma-Delta Codec for Mobile Telephone Applications" Second International Conference on Advanced A-D and D-A Conversion Techniques and Their Applications, 6-8 Jul. 1994, Cambridge, UK (Abstract only).
Lu A.K. et al.: "A High-Quality Analog Oscillator Using Oversampling D/A Conversion Techniques" IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, vol. 41, No. 7, pp. 437-444, Jul. 1994, USA (Abstract only).
Stewart, R.W.: "An Overview of Sigma-Delta ADCs and DAC Devices" IEE Colloquim on Oversampling and Sigma-Delta Strategies for DSP (Digital Signal Processing) (Digest No. 1995/217) pp. 1/1-9, 23 Nov. 1995, London, UK (Abstract only).
Bhagwati et al. Design Methodology for .SIGMA..DELTA.M, IEEE Trans. Comun., vol. COM-31, pp.360-370, Mar. 1983.

Affiliated with

Also associated with

Rating

Method and modulator for modulating digital signal to higher fre does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and modulator for modulating digital signal to higher fre, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and modulator for modulating digital signal to higher fre will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1804709