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Circuit arrangement for transmitting audio signals
| Details |
Inventors: Dunnebacke, Joachim; Schwantes-Roy, Dirk;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Mottola; Steven
Assistant Examiner:
Attorney, Agent or Firm: Goodman; Edward W.
A circuit arrangement for transmitting audio signals includes a signal amplifier having four power amplifiers each with an input and an output, a first and a third one of the four power amplifiers are non-inverting for applied audio signals, and a second and a fourth one of the four power amplifiers are inverting, the inputs of the first and second power amplifiers receiving a first audio signal and the inputs of the third and fourth power amplifiers receiving a second audio signal. In a first configuration mode for audio signals of low amplitude, the first and fourth power amplifiers each form a single-ended amplifier and the outputs of the second and/or the third power amplifier carry a reference potential. In a second configuration mode for audio signals of higher amplitude, the first and second power amplifiers form a first bridge amplifier, and the third and fourth power amplifiers form a second bridge amplifier. The outputs of the first and second power amplifiers are arranged for the connection of a first signal sink and the outputs of the third and fourth power amplifiers are arranged for the connection of a second signal sink. An automatic change-over to the second configuration mode IS effected if the signal sinks include further amplifier arrangements. At very low cost this also provides compatibility for a symmetrical signal amplifier with signal sinks having asymmetrical inputs. |
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DETAILED DESCRIPTION It is an object of the invention to provide simple means enabling said arrangements to be combined and to be operated in combination with one another without any problems.
According to the invention this object is achieved by a circuit arrangement for transmitting audio signals, having a signal amplifier comprising four power amplifiers each having an input and an output, of which a first one and a third one are non-inverting for audio signals applied to them and of which a second one and a fourth one are inverting, the inputs of the first and the second power amplifier being arranged to receive a first audio signal and the inputs of the third and the fourth power amplifier being arranged to receive a second audio signal, in which, in a first configuration mode for audio signals of low amplitude, the first and the fourth power amplifier each form a single-ended amplifier and the outputs of the second and/or the third power amplifier carry a reference potential, and in which, in a second configuration mode for audio signals of higher amplitude, the first and the second power amplifier form a first bridge amplifier and the third and the fourth power amplifier form a second bridge amplifier, the outputs of the first and the second power amplifier being arranged for the connection of a first signal sink and the outputs of the third and the fourth power amplifier being arranged for the connection of a second signal sink, an automatic change-over to the second configuration mode being effected if the signal sinks include further amplifier arrangements.
The invention enables a self-configurable signal amplifier with symmetrical outputs to be used without any modification of the circuit arrangement both in conjunction with an input circuit having symmetrical inputs and with an input circuit having asymmetrical inputs.
In the case of subsequent mounting or replacement of devices, for example, a car radio, no adaptations are necessary to existing devices or to new devices to be built in
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Audio Signal Processing 
