Invalidity dossier
US 5179360
Transmitting/receiving apparatus switchable between digital and analog modulation modes
Current assignee: Sony Corp
Added 9/23/2026, 6:24:10 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 5,179,360
Title: Transmitting/receiving apparatus switchable between digital and analog modulation modes
Patent number: US 5,179,360 A
Inventor: Mitsuhiro Suzuki
Assignee: Sony Corporation
Priority date: 1991-03-20 (noted as an assumption in the source)
Filing date: 1992-03-20
Publication (grant) date: 1993-01-12
Status shown: Expired – Fee Related; anticipated expiration 2012-03-20
Purpose: The invention relates to a transmitting apparatus and a receiving apparatus suitable for an automobile cellular telephone terminal that can cope with both a digital transmission mode and an analog transmission mode. A stated object is to provide a transmitting and receiving apparatus in which signals of necessary frequencies can be easily generated by one reference signal generator. The background describes conventional analog cellular systems (FM audio, ~800 MHz) as capacity-limited, and notes development toward digital systems using VSELP coding and π/4 shift QPSK with TDMA.
Plain-language scope (from the excerpt): On the transmit side, the apparatus converts an input audio signal to digital (A/D), selects digital or analog mode via mode setting switches, and either encodes the digital audio (VSELP codec, channel coder producing a 24.3 kHz modulation rate, DPSK modulation) or processes it for analog transmission (audio processing circuit, digital frequency modulating circuit, wide band data path). Outputs are multiplied in frequency (m-times multiplying circuit) and supplied to an orthogonal modulating and D/A converting circuit that selects ±I and ±Q components to produce an IF signal (12.15 MHz), which is mixed with a PLL synthesizer signal to form the ~800 MHz transmission signal. The excerpt also recites a receiving apparatus with A/D converting and orthogonal demodulating means, two frequency dividing means forming first and second carrier frequencies, and digital/analog reception processing paths. The classification H04B1/406 confirms use of the same oscillator for transmit and receive with more than one transmission mode (analog and digital).
What the excerpt does not establish: It is a partial excerpt; the receiving apparatus description, claims, and full reference details are omitted. It does not establish claim scope, validity, litigation, ownership transfers, or prior-art effect. The legal status is stated as an assumption, not a conclusion.
Generated 10/1/2026, 9:42:46 PM
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Prior art
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