Claims
- 1. An RF converter for enhancing high band components of a video signal, comprising:
- first modulating means for modulating a video signal and outputting a modulated video signal having high band components and low band components,
- second modulating means for modulating a sound signal and outputting a modulated sound signal,
- combining means for combining said modulated video and sound signals and outputting a combined modulated signal, and
- means for enhancing said high band components of said modulated video signal, including a surface acoustic wave filter receiving said combined modulated signal and outputting a television signal, said filter having a pass band with a predetermined amplitude characteristic which is enhanced at a high frequency side thereof, and a predetermined group delay characteristic which is substantially constant over said pass band.
- 2. An RF converter for enhancing the picture resolution of a TV output signal, comprising
- first modulating means for receiving a low-frequency video signal and producing a modulated high-frequency video output signal;
- second modulating means for receiving low-frequency audio signal and producing a modulated high-frequency audio output signal;
- combining means for combining said modulated high-frequency video and audio output signals of said first and second modulating means and producing a combined high-frequency output signal with video and audio components; and
- filter means for receiving said combined high-frequency output signal and producing a TV output signal, said filter means comprising an SAW band pass filter with a pass band having enhanced amplitude response characteristics in an upper end thereof; and predetermined group delay characteristics over its pass band; for enhancing said video components in said upper end of said pass band, and thereby enhancing the picture resolution of said TV output signal.
- 3. An RF converter as in claim 2, wherein said SAW band-pass filter has substantially constant phase characteristics over its passband.
- 4. An RF converter as in claim 2, wherein the phase characteristics of said SAW band-pass filter vary over its passband.
- 5. An RF converter as in claim 2, wherein said TV output signal is a broadcast-type TV signal.
- 6. An RF converter as in claim 5, wherein said modulated high-frequency output signals are in the broadcast TV frequency range.
Priority Claims (1)
Number |
Date |
Country |
Kind |
59-77324 |
Apr 1984 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 81,599 filed on Aug. 3, 1987, now abandoned, which was a continuation of application Ser. No. 723,733 filed on Apr. 16, 1985, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0039408 |
Aug 1980 |
JPX |
0017780 |
Jan 1984 |
JPX |
Non-Patent Literature Citations (3)
Entry |
Yamada & Uematsu, New Color TV Receiver with Composite SAW IF Filter Separating the Sound & Picture Signals, IEEE Transactions on Consumer Electronics, p. 192, vol. CE-28, No. 3, Aug. 1982. |
Matsuura, Murata, Yuki & Hazama, Frequency Synthesizing Tuning Sys. with SAW Device, IEEE Trans. on Consumer Electronics, p. 404, vol. CE-26, Aug. 1980. |
New Receiver Circuit Improves Sound Quality, p. 64, vol. 51, No. 2 (Feb. 1980), Radio Electronics. |
Continuations (2)
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Number |
Date |
Country |
Parent |
81599 |
Aug 1987 |
|
Parent |
723733 |
Apr 1985 |
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