CN214799886U - Verification device for vehicle-mounted audio system power amplifier - Google Patents

Abstract

The utility model discloses a verification device of on-vehicle audio system power amplifier. A verification device for a vehicle-mounted audio system power amplifier comprises: a TDM converter for converting the audio signal into a TDM signal; an audio signal processor for receiving the TDM signal and generating and outputting a test signal for feeding to a power amplifier, the audio signal processor having N audio channels, N > 1; the channel configurator is provided with M configuration units, M is larger than or equal to N, each audio signal corresponds to one configuration unit, and each configuration unit is respectively provided with a selection state and a non-selection state; and the controller is used for judging whether each configuration unit is in a selection state or a non-selection state and controlling the audio signal processor to place the TDM signals in the audio channels corresponding to the configuration units in the selection state. The utility model discloses can verify the function and the performance that are used for on-vehicle audio system's power amplifier simply and swiftly.

Description

Verification device for vehicle-mounted audio system power amplifier

Technical Field

The utility model relates to a power amplifier production field of vehicle-mounted audio system specifically is a verification device of vehicle-mounted audio system power amplifier.

Background

For car audio systems, audio transmission is increasingly diversified, for example, multimedia stereo, 5.1 channel, 7.1 channel, warning tone, VR, bluetooth phone, etc. audio signals need to be transmitted. Most in-vehicle entertainment systems utilize a TDM audio bus to transmit multiple channels of audio data. Since the TDM bus is an I2S-like audio bus, and an audio bus is formed by three lines, namely BCLK, LRCLK and DATA, a power amplifier for multi-channel audio transmission needs to verify the function of each channel in the actual production and test processes. A standard signal needs to be input into each channel of the power amplifier, and the function of each channel is verified.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a verification device of on-vehicle audio system power amplifier.

According to an aspect of the utility model, a verification device of on-vehicle audio system power amplifier is provided, include:

a TDM converter for converting the audio signal into a TDM signal;

the audio signal processor is used for receiving the TDM signals and generating and outputting test signals used for feeding power amplifiers, the audio signal processor is electrically connected with the TDM converter, the audio signal processor is provided with N audio channels, and N is greater than 1;

the channel configurator is provided with M configuration units, M is larger than or equal to N, each audio channel corresponds to one configuration unit, and each configuration unit is respectively provided with a selection state and a non-selection state; and

and the controller is electrically connected with the channel configurator and the audio signal processor.

According to a preferred embodiment, each of the configuration units includes a dial switch, and when the dial switch is turned off, the configuration unit is in a selection state.

According to a further preferred embodiment, each of the configuration units further includes a first resistor, a first end of the first resistor is electrically connected to a voltage input terminal, a second end of the first resistor is electrically connected to a first end of the dial switch, and a second end of the dial switch is electrically connected to the controller.

According to a further preferred embodiment, each of the configuration units further includes a second resistor, a first end of the second resistor is grounded, and a second end of the second resistor is electrically connected to the second end of the dial switch and a midpoint of the controller.

According to a further preferred embodiment, the controller includes a plurality of I/O ports, and the second end of each of the dial switches is electrically connected to one of the I/O ports.

According to a preferred embodiment, the controller is electrically connected to the audio signal processor through a uart bus.

According to a preferred embodiment, the controller is an MCU chip.

According to a preferred embodiment, the audio signal processor is a DSP chip.

According to a preferred embodiment, the verification means further comprises an A2B line for passing the output of the DSP chip to a power amplifier.

According to a preferred embodiment, the verification device further comprises an audio input module electrically connected to the TDM converter.

According to a second aspect of the present invention, there is provided a verification method for a vehicle audio system power amplifier, wherein the verification device comprises: and according to one or more audio channels to be tested, setting one or more configuration units corresponding to the audio channels to be in a selection state, and controlling the audio signal processor to place the TDM signals in the audio channels corresponding to the configuration units in the selection state by the controller.

The utility model adopts the above scheme, compare prior art and have following advantage:

the utility model discloses a power amplifier of vehicle-mounted audio system confirms the power amplifier passageway that needs the verification through the configuration unit when verifying product performance, and the controller informs the audio processor according to this and need put the TDM signal of testing into which audio channel, and the audio processor is corresponding to place the TDM signal on these audio channels that define, feeds the power amplifier, tests; the method can simply and quickly send a standard signal to the corresponding channel, and achieves quick product function and performance verification.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a block diagram of a power amplifier verification apparatus according to an embodiment of the present invention;

fig. 2 is a circuit diagram of the connection between the channel configurator and the MCU chip in fig. 1.

Detailed Description

The following detailed description of the preferred embodiments is provided in conjunction with the accompanying drawings to enable those skilled in the art to more readily understand the advantages and features of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. Furthermore, the technical features mentioned in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As used in this specification and the appended claims, the terms "comprises" and "comprising" are intended to only encompass the explicitly identified steps and elements, which do not constitute an exclusive list, and that a method or apparatus may include other steps or elements.

It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

Referring to fig. 1, according to an embodiment of the present invention, an apparatus for verifying a power amplifier of a car audio system includes an audio input module 1, a TDM converter 2, an audio signal processor 3, a channel configurator 4 and a controller 5, which are preferably integrated on a circuit board. The verification device can verify the power amplifier, can selectively feed standard signals to one or more channels of the power amplifier, and can quickly verify the function and performance of a product.

The audio input module 1 is used for inputting audio, which is an analog signal or a digital signal. Specifically, the audio input module 1 includes an analog input port provided on a circuit board.

The TDM converter 2 is electrically connected to the audio input module 1, and converts the audio signal input by the audio input module 1 into a TDM signal. The TDM converter 2 divides a channel into different time slots in time, and interleaves different pulse signals in the different time slots to sequentially realize multiplexing of multiple signals in a time domain. The TDM signals can realize the transmission of multiple audio signals by using the same set of buses.

The audio signal processor 3 is used for receiving the TDM signals and selecting the TDM signals to be fed to a selected channel of the power amplifier to be used as test signals of the power amplifier; specifically, the audio signal processor 3 includes a DSP chip. An input terminal of the audio signal processor 3 is electrically connected to an output terminal of the TDM converter 2 through a TDM bus including a bit clock line BCLK transmission line, an LRCLK transmission line, and a DATA transmission line. The audio signal processor 3 has N audio channels, N > 1; for example, a DSP chip may have 8 audio channels (solts), noted solt0, solt1, solt2, solt3, solt4, solt5, solt6, solt7, and solt 8. The output end of the audio signal processor 3 is electrically connected to the power amplifier to feed the test signal to the power amplifier. For example, the DSP chip is electrically connected to the input of the power amplifier through A2B line.

As shown in FIG. 2, the channel configurator 4 has M configuration units 40, M ≧ N, one configuration unit 40 per audio signal, each configuration unit 40 having a selected state and a non-selected state, respectively. The channel configurator 4 has 16 configuration units 40, 8 of which correspond to 8 solts of the DSP chip respectively for selecting the solt; the other 8 are used for audio selection and clock selection. Each channel configurator 4 is electrically connected to a corresponding port of the controller 5, such as an I/O port of the MCU chip.

Specifically, in the present embodiment, each configuration unit 40 includes a dial switch 401, a first resistor 402, a voltage input terminal 403, and a second resistor 404. A first end of the dial switch 401 is electrically connected to the first resistor 402, and a second end is electrically connected to one of the I/O ports of the MCU chip; the on-off of the dial switch 401 can be switched manually, so that the level of the I/O port of the MCU chip changes accordingly, and whether the configuration unit 40 is in the selected state or the non-selected state is determined according to the level. The first resistor 402 is used as a pull-up resistor, and a first end of the first resistor 402 is electrically connected to a voltage input terminal 403 for receiving a pull-up voltage, such as 3.3V; the second end of the first resistor 402 is electrically connected to the first end of the dial switch 401. The first end of the second resistor 404 is grounded, and the second end of the second resistor 404 is electrically connected to the second end of the dial switch 401 and the middle point of the I/O port of the MCU chip.

The controller 5 is configured to determine whether each configuration unit 40 is in a selected state or a non-selected state, and control the audio signal processor 3 to place the TDM signal in the audio channel corresponding to the configuration unit 40 in the selected state. Specifically, the controller 5 includes an MCU chip having a plurality of I/os, and each configuration unit 40 corresponds to and is electrically connected to one I/O port. The MCU chip is electrically connected with the DSP chip through the UART bus and is used for judging which configuration units 40 are in a selection state after detecting the level change of the I/O, and further informing the DSP chip to control the DSP chip to configure TDM signals on audio channels corresponding to the configuration units 40 in the selection state, and further forming test signals of corresponding channels fed to the power amplifier.

When the product performance is verified, determining a channel of a power amplifier to be verified, namely, placing a TDM signal on which solts of a DSP chip; the dial switches 401 of the configuration units 40 corresponding to these solts are turned off, and the corresponding I/O on the MCU chip changes to low level, which means that these I/O ports are in effect; the MCU chip tells the DSP chip through the UART line which SOLs the TDM signals to be tested need to be put into, and the DSP chip correspondingly puts the TDM signals onto the defined SOLs to feed the power amplifier for testing.

In this embodiment, which channel of the DSP chip is represented by each I/O port of the MCU chip is determined, the I/O port of the MCU chip is high level by default (the first resistor 402 is pulled up by 3.3V) in the power-on process of the product, when the MCU chip detects that the I/O port is changed from high level to low level, that is, the dial switch 401 is toggled, the I/O port is effective, and the MCU chip tells the DSP chip through the UART bus that the audio signal for testing is to be put into the defined channel.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are preferred embodiments, which are intended to enable persons skilled in the art to understand the contents of the present invention and to implement the present invention, and thus, the protection scope of the present invention cannot be limited thereby.

Claims (10)

1. The utility model provides a verifying attachment of vehicle-mounted audio system power amplifier which characterized in that includes:

a TDM converter for converting the audio signal into a TDM signal;

the audio signal processor is used for receiving the TDM signals and generating and outputting test signals used for feeding power amplifiers, the audio signal processor is electrically connected with the TDM converter, the audio signal processor is provided with N audio channels, and N is greater than 1;

the channel configurator is provided with M configuration units, M is larger than or equal to N, and each audio channel corresponds to one configuration unit; and

and the controller is electrically connected with the channel configurator and the audio signal processor.

2. The apparatus according to claim 1, wherein each of the configuration units includes a dial switch, and when the dial switch is turned off, the configuration unit is in a selection state.

3. The apparatus according to claim 2, wherein each of the configuration units further comprises a first resistor, a first end of the first resistor is electrically connected to a voltage input terminal, a second end of the first resistor is electrically connected to the first end of the dial switch, and a second end of the dial switch is electrically connected to the controller.

4. The apparatus according to claim 3, wherein each of the configuration units further includes a second resistor, a first end of the second resistor is grounded, and a second end of the second resistor is electrically connected to the second end of the dial switch and a middle point of the controller.

5. The apparatus according to claim 3, wherein the controller comprises a plurality of I/O ports, and the second terminal of each of the plurality of dial switches is electrically connected to one of the I/O ports.

6. The apparatus according to claim 1, wherein the controller is electrically connected to the audio signal processor via a uart bus.

7. The authentication device according to claim 1 or 6, wherein the controller is an MCU chip.

8. The authentication device according to claim 1 or 6, wherein the audio signal processor is a DSP chip.

9. The device of claim 8, further comprising an A2B line for passing the output of the DSP chip to a power amplifier.

10. The validation apparatus of claim 1, further comprising an audio input module electrically connected to the TDM converter.

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