Invalidity dossier
US 7158475
Transmitting apparatus and method and provision medium
Current assignee: Sony Corp
Added 9/21/2026, 10:40:01 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US7158475 — Transmitting Apparatus and Method and Provision Medium
Bibliographic data (as supplied): US7158475B1; application US09/936,337; filed 2000-03-10; priority date 1999-03-12; granted/publication date 2007-01-02; inventors Yasunari Ikeda, Tamotsu Ikeda, and Takahiro Okada; original and current assignee Sony Corp; status listed as "Expired – Lifetime," with anticipated expiration 2020-03-10. Classifications include H04L27/26 and H04L27/26265 (sidelobe suppression adapted to multicarrier systems, e.g. spectral precoding).
Purpose: The patent addresses interference between adjacent channels in OFDM transmission. Conventionally, guard bands are inserted between channels (e.g., ch1 at f1, ch2 at f2, ch3 at f3). Because guard bands reduce spectral-use efficiency, the stated object is to enable reception of a desired signal without interference from an adjacent signal without providing a guard band — particularly as analog broadcasts are abolished and digital broadcast shifts occur.
Plain-language scope: The disclosure describes a transmitting apparatus/method and a "provision medium" (a computer-readable program supplied to a transmitting apparatus). A first window signal serving as a reference is input; a first clock and a second window signal are generated from it; an OFDM signal is modulated according to information using the first clock and second window signal; and a second clock is generated from the second window signal. That second clock controls the transmission interval of OFDM signals so that the carrier interval between one OFDM signal and an adjacent OFDM signal is a whole multiple of the interval between adjacent carriers within the OFDM signal. Alternative embodiments derive the window signal and first clock by demodulating an input OFDM signal, or accept a window signal and first clock directly as input, generating the second clock from the window signal.
Not established by this excerpt: The full text of the claims (only the summary/definitions section appears), the detailed embodiments beyond the truncated description, the complete figure content (FIGS. 1–9 are referenced but not reproduced), or any prosecution history, validity, ownership transfer, or prior-art analysis.
Generated 10/1/2026, 10:01:23 PM
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Assignment history
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Prior art
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