Retrofitable CD player system

Details Retrofitable CD player system Retrofitable CD player system

1996-11-21

1998-08-04

Dinh, Tan

Dynamic information storage or retrieval

Combined independent audio systems

Changeover between audio systems

369 6, 34082524, H04B 120, H04Q 1902

Patent

active

057904812

ABSTRACT:
Installing a high quality audio source, such as a CD player, in an automobil requires often installation of a radio/tuner of sufficient quality to provide an audio signal corresponding to the quality of the audio source. In leased automobils this presents a problem because of warrenty and return conditions. The problem is solved by using a separate amplifier connected into the wiring between factory installed radio/tuner and loudspeakers and sensing the setting of the radio/tuner control knobs by placing a defined modulated carrier on the antenna input of the radio/tuner. The output of the radio/tuner then provides a signal reflecting the setting of the control knobs. This signal is used to control the amplifier.

REFERENCES:
patent: 4864550 (1989-09-01), Kawanaka
patent: 5235568 (1993-08-01), Masaru
patent: 5287333 (1994-02-01), Hirata
patent: 5483506 (1996-01-01), Yoshioka et al.
patent: 5572194 (1996-11-01), Shiota

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