Circuitry for multiplying a PCM signal by a sinusoid

Details Circuitry for multiplying a PCM signal by a sinusoid Circuitry for multiplying a PCM signal by a sinusoid

1986-06-30

1988-02-23

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329109, 328160, 455323, 455337, 375 25, 375 94, H04L 2706, H03D 100

Patent

active

047273330

ABSTRACT:
Apparatus for multiplying a sampled data signal by a sinusoid having a period which is a multiple of the sample rate includes a plurality of sample scaling means to scale the sampled data signal by factors corresponding to the sine of angle .theta. over an angular range of 90 degrees in angular increments of 2.pi. divided by said multiple. A multiplexer multiplexes the scaled samples at the sample rate to produce a signal corresponding to the sampled data signal multiplied by the sinusoid. An embodiment is described for demodulating the stereo difference signal of a BTSC sound signal with serial-bit digital processing circuitry.

REFERENCES:
patent: 4404430 (1983-09-01), Ogita
patent: 4517655 (1985-05-01), Classen et al.
patent: 4569072 (1986-02-01), van Roermund
patent: 4616185 (1986-10-01), Van Roermund
patent: 4616192 (1986-10-01), Van Roermund
van Ginderdeuren et al., "Compact NMOS Building Blocks and a Methodology for Dedicated Digital Filter Applications", IEEE, JSS6, vol. SC-18, No. 3, Jun. 83, pp. 306-315.

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