Digital sub-systems and building blocks for a mostly digital low-cost BTSC compatible encoder
US6192086A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 14, 2000 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Jan 14, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H20/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A BTSC-compatible encoder that is integrated onto an application specific integrated circuit includes a low pass filter that is responsive to a digital representation of an audio signal that has a sample rate of F.sub.S. The low pass filter generates a corresponding second digital signal having an pseudo-interpolated sampling rate of 4F.sub.S. A digital infinite impulse response pre-emphasis filter generates a pre-emphasized output signal corresponding to the second digital signal. A digital signal compressor that is responsive to the pre-emphasized output signal, generates a compressed digital signal corresponding to the pre-emphasized output signal. A digital phase locked loop that is responsive to a video sync pulse having a sync pulse frequency, generates a third digital signal corresponding to a sinusoid having a frequency equal to twice the sync pulse frequency and a having a sampling frequency equal to 4F.sub.S. A first digital multiplier multiplies the compressed digital signal by the third digital signal, thereby generating a digital BTSC-compatible stereo television difference signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.