JP2002084150A - Digital power amplifier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a digital power amplifier which has a small circuit configuration and can respond even to a new source of signals. SOLUTION: Selectors 23a-23f are imputted with a plurality of series of input signals, and then selectively output signals to a plurality of digital power amplifiers 24a-24f based on the series. Due to this structure, a plurality of series of input signals can be distributed arbitrarily into a plurality of digital power amplifiers 24a-24f, and both a common processing for all the series of input signals and a separate processing for each series of input signals can be conducted collectively in a preliminary stage. A processing circuit for processing the input signals in each of the digital power amplifier 24a-24f can be smaller in size than in an analog power amplifier. Alternatively, the separate processing for each series of input signals may be conducted, using each of the digital power amplifiers 24a-24f.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power amplifier including a plurality of power amplifiers for processing a plurality of input signals.

[0002]

2. Description of the Related Art For example, a sound reproducing device is provided with a power amplifying device for driving a speaker, and a current sound reproducing device generally reproduces a plurality of streams (channels) of sound signals to control a plurality of speakers. Since they are driven separately, the power amplifying device for driving these speakers also includes a plurality of power amplifiers. Also, in the sound reproducing device,
For example, in addition to an audio reproducing device that reproduces an audio signal from a single system signal source including only a compact disk (CD) reproducing unit, for example, sound is reproduced from a plurality of system signal sources including a CD reproducing unit and a mini disk (MD) reproducing unit. There is a sound reproducing device for reproducing a signal.

[0003] In a power amplifying apparatus in a sound reproducing apparatus for reproducing sound signals from a plurality of signal sources, conventionally, sound signals of respective streams are fixedly input to respective power amplifiers. That is, for example, a CD playback unit and an MD
In an audio reproducing apparatus which reproduces an audio signal from two signal sources of a reproducing unit and has two speakers for two channels of a left system and a right system, the system of the signal source is switched when reproducing the audio signal. As a result, the left-channel audio signal and the right-channel audio signal are always input to the left speaker power amplifier and the right speaker power amplifier, respectively.

On the other hand, for example, when a sound reproducing apparatus is installed in a room, a common equalization is applied to the sound signals of all streams in accordance with the shape of the room so that the reproduced sound can be heard in an optimum state. In some cases, it may be desirable to perform processing and perform individual equalization processing on each series of audio signals in accordance with the installation position of each speaker. Even in this case, if the audio signal of each stream is fixedly input to each power amplifier as described above, both the common processing for the audio signal of all streams and the individual processing for the audio signal of each stream can be performed by the power amplifier. Since it can be performed at a stage prior to the amplification device, the circuit scale of the power amplification device can be small.

[0005]

However, audio signals are reproduced from two signal sources, for example, a digital versatile disk (DVD) reproducing unit and a CD reproducing unit, and a 5.1-channel signal is reproduced for the DVD reproducing unit. In the sound reproducing apparatus having the six speakers, a power amplifier including six power amplifiers for driving these six speakers is used. In this sound reproducing apparatus, when the system of the signal source is switched at the time of reproducing the sound signal, a certain power amplifier has D
In the case of a VD playback unit, a rear left sequence audio signal is input, and in the case of a CD playback unit, a right sequence audio signal is input,
A different series of acoustic signals may be input to each power amplifier.

For this reason, in this sound reproducing apparatus, individual processing for each series of sound signals cannot be performed collectively in a stage prior to the power amplifier, and must be performed by each power amplifier. As a result, it is necessary to provide a processing circuit similar to that of the previous stage of the power amplifier in each power amplifier, and the circuit scale of the power amplifier in the analog power amplifier becomes enormous. Accordingly, an object of the present invention is to provide a digital power amplifying device which has a small circuit scale and can cope with a new signal source.

[0007]

In the digital power amplifier according to the present invention, since the selector inputs a plurality of input signals and selectively outputs the input signals to a plurality of digital power amplifiers based on the input signals, a plurality of input signals are provided. A series of input signals can be arbitrarily distributed to a plurality of digital power amplifiers. Also,
The scale of the processing circuit for processing the input signal by the digital power amplifier may be inherently smaller than that of the analog power amplifier.

In the digital power amplifier according to the second aspect, the selector selectively outputs a plurality of input signals to a plurality of digital power amplifiers based on a selection signal generated based on the input signal sequence. , A plurality of input signals can be automatically distributed to a plurality of digital power amplifiers.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, signals output from a signal source (not shown) such as a CD reproducing unit, an MD reproducing unit, a DVD reproducing unit, and a set-top box and power-amplified include signal lines 11 to 14. Is input to the signal source selector 15 through the above-mentioned operations. When the user operates the display / operation panel 16, the display / operation panel 16 sends the information signal to the control device 17. The control device 17 analyzes the operation of the user from the information signal and outputs the control signal to the signal source selector 15.
And to the decoder / effector 18.

A signal source selector 15 selects an input signal from the signal lines 11 to 14 based on a control signal from the control device 17, and converts a stream signal of the format shown in FIG. Send to 18. The parameters of the decoder / effector 18 are operated manually by the user or automatically by the control device 17. The decoder / effector 18 decodes, for example, a compressed multi-channel input signal and converts the 5.1-channel signals a to f of the format shown in FIG. The signal is sent to signal lines 22a to 22f.

The information of the input signal analyzed by the decoder / effector 18 is transmitted to the control device 17 and displayed on the display / operation panel 16. Decoder / effector 18
The information of the input signal analyzed by the user and the designation by the user are sent from the control device 17 to the selectors 23a to 23f of the digital power amplifier 21. Based on the information and the designation, the selectors 23a to 23f Lines 22a-22f
And outputs the signals input from these signal lines 22a to 22f to the digital power amplifiers 24a to 24f.

For example, when the input signal is 5.1 channels, all the signal lines 22a to 22f are selected, the input signal is two channels, and the first channel signal and the second channel signal are input.
When the signal of the channel is alternately output to the signal lines 22a to 22f, all the signal lines 22a to 22f are selected, or only the signal lines 22a and 22b are selected. The digital power amplifiers 24a to 24f switch binary or ternary or higher-level signals by switching elements and output the signals.

A selection signal is generated based on the information of the input signal analyzed by the decoder / effector 18, and the selectors 23a to 23f are determined based on only this selection signal.
May be selected. Digital power amplifier 24
The signals that have been power-amplified at a to f are loads 25a to 25
Drive f. If the digital power amplifying device 21 is used as a power amplifier for driving a speaker or the like of a sound reproducing device, the speaker or the like is connected to the loads 25a to 25
f.

As is apparent from the above description, in the digital power amplifier 21, the selectors 23a to 23f convert the input signals of a plurality of channels into a plurality of digital power amplifiers 24a to 24a.
24f. Therefore, both the common processing for the input signals of all the channels input from the signal lines 11 to 14 of each system and the individual processing for the input signals of the respective channels, the decoder / effector which is a stage prior to the digital power amplifier 21 You can go together at 18. Also, each of the digital power amplifiers 24a to 24f
, A signal processing circuit is added to the digital power amplifier 24a to perform individual processing on the input signal of each channel.
To 24f.

Further, in the digital power amplifier 21, the selectors 23a to 23f can arbitrarily distribute input signals of a plurality of channels to the plurality of digital power amplifiers 24a to 24f. It is possible to cope with both systems with two systems per system and systems with three or more systems per system.

[0016]

In the digital power amplifier according to the first aspect, since a plurality of series of input signals can be arbitrarily distributed to a plurality of digital power amplifiers, input signals can be input from a plurality of signal sources having different numbers of series. Even when a signal is input, both the common processing for the input signals of all the series and the individual processing for the input signals of each series in the signal source of each system can be collectively performed before the digital power amplifier, so that the digital The circuit scale of the power amplifying device may be small.

Further, since the scale of a processing circuit for processing an input signal by a digital power amplifier may be inherently smaller than that of an analog power amplifier, individual processing for each system input signal in each system signal source is performed. Can be performed by each digital power amplifier, and a new signal source can be handled.

In the digital power amplifier according to the second aspect, since the input signals of a plurality of streams can be automatically distributed to the plurality of digital power amplifiers, the equipment to which the digital power amplifier is applied is convenient.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram of a device to which an embodiment of the present invention is applied.

FIGS. 2A and 2B show waveforms of signals in the device shown in FIG. 1, wherein FIG. 2A shows a waveform of a signal output from a signal source selector, and FIG. 2B shows a waveform of a signal output from a decoder / effector; It is a waveform.

[Explanation of symbols]

21: Digital power amplifier, 23a to 23f: Selector, 24a to 24f: Digital power amplifier

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) KA33 KA67 MA10 SA05 TA01 TA06 VL02 VL08

Claims (2)

[Claims] 1. A digital power amplifier comprising: a plurality of digital power amplifiers; and a selector that inputs a plurality of series of input signals and selectively outputs to the plurality of digital power amplifiers based on the series. 2. The digital power amplifier according to claim 1, wherein a selection signal generated based on the sequence of the input signal is input, and the selector performs the output based on the selection signal.