Retrofitable CD player system
First Claim
1. A high quality audio source for use in combination with an existing car radio installation, comprisinga radio/tuner having a first antenna input, and providing first audio signals on a set of first audio signal outputs, a high quality audio source providing second audio signals on a set of second audio signal outputs,said radio/tuner further including means for selectively controlling said first or second audio signals,an antenna for receiving wireless transmitted signals,a preamplifier,a set of loudspeaker amplifiers, each having an input and an output,a plurality of loudspeakers each having a fourth audio signal input;
- said pre-amplifier havingan modulated signal output connected to said first antenna input,a set of first audio signal inputs connected to said first audio signal outputs of said radio/tuner,a set of second audio signal inputs connected to said second audio signal outputs of said high quality audio source,a third set of audio signal outputs, each of said third set of audio signal outputs being connected to one of said fourth audio signal inputs of said plurality of loudspeakers via an associated one of said loudspeaker amplifiers.
18 Assignments
0 Petitions
Accused Products
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.
36 Citations
15 Claims
-
1. A high quality audio source for use in combination with an existing car radio installation, comprising
a radio/tuner having a first antenna input, and providing first audio signals on a set of first audio signal outputs, a high quality audio source providing second audio signals on a set of second audio signal outputs, said radio/tuner further including means for selectively controlling said first or second audio signals, an antenna for receiving wireless transmitted signals, a preamplifier, a set of loudspeaker amplifiers, each having an input and an output, a plurality of loudspeakers each having a fourth audio signal input; said pre-amplifier having an modulated signal output connected to said first antenna input, a set of first audio signal inputs connected to said first audio signal outputs of said radio/tuner, a set of second audio signal inputs connected to said second audio signal outputs of said high quality audio source, a third set of audio signal outputs, each of said third set of audio signal outputs being connected to one of said fourth audio signal inputs of said plurality of loudspeakers via an associated one of said loudspeaker amplifiers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
13. A method for controlling loudness, balance and tone of an audio signal of a not-factory installed audio source in an automobile using control means for loudness, balance and tone of a factory installed car radio, said method including
providing a broadcast frequency carrier modulated with a first signal to said car radio, tuning said radio to said broadcast frequency, recovering said first signal from said broadcast frequency carrier, thereby providing a second signal, a first process for changing said second signal in accordance with the setting of said control means, thereby providing a third signal, and a second process for generating signals for controlling loudness, balance and tone of said audio signal provided by said not-factory installed audio source, using said third signal.
Specification