Digital voice and data frequency modulation circuit

Details Digital voice and data frequency modulation circuit Digital voice and data frequency modulation circuit

1986-06-11

1987-07-21

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 9R, 332 21, 375 62, 455110, H03C 300

Patent

active

046821236

ABSTRACT:
The bandwidth of frequency modulated signals is limited in a digital data transmission system by shaping the square digital waveform to form a trapezoidal shaped waveform having a positively-sloped ramp on the leading edge of the waveform and negatively-sloped ramp on the following edge of the waveform. Provisions are made to selectively determine the slope of the ramps and the amplitude of the waveform so that the system can be used with a wide range of data transmission speeds without resort to bandpass filter or component changes as were required in the prior art. Provision is also made for transmission of analog data in the same system by providing a feedback loop which causes the ramping to follow, and thus approximate, the analog waveform. The shaped data signal is fed to a frequency synthesizer which produces a frequency modulated sine wave whose frequency deviation is related to the magnitude of the digital or analog data signal.

REFERENCES:
patent: 4618966 (1986-10-01), Stepp et al.

Affiliated with

Also associated with

Rating

Digital voice and data frequency modulation circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital voice and data frequency modulation circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital voice and data frequency modulation circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-209679