JPH0534739U - Digital signal processor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a digital signal processor capable of performing accurate signal processing regardless of the presence or absence of pre-emphasis. [Structure] A de-emphasis filter 4 that de-emphasiss input data, a changeover switch circuit 6 that selects and outputs one of the input data and the output of the de-emphasis filter, and determines whether the input data is pre-emphasized. However, when it is determined that the pre-emphasis is performed, the changeover switch circuit 6 is switched to the output side of the de-emphasis filter, and when it is determined that the pre-emphasis is not performed, the changeover switch circuit 6 is switched to the input data side and the digital control is performed. The audio interface receiver 1 is provided, and the output of the changeover switch circuit 6 is supplied to the signal processing unit 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a digital signal processor suitable for signal processing of source signals such as audio signals.

[0002]

[Prior Art]

 In the conventional signal processor, there was no digital signal processor that performs signal processing by distinguishing the processing contents between pre-emphasized data and non-pre-emphasized data.

[0003]

[Problems to be solved by the device]

 However, even if the data pre-emphasized by the conventional digital signal processor described above and the data of the same content that is not pre-emphasized are processed in the same way, the content of the data output after the processing differs depending on the presence or absence of the pre-emphasis. There was a problem. Therefore, even if the de-emphasis processing is performed after the signal processing, the data contents do not match, which causes a problem that accurate signal processing cannot be performed.

An object of the present invention is to provide a digital signal processor capable of performing accurate signal processing regardless of the presence or absence of pre-emphasis.

[0005]

[Means for Solving the Problems]

 The digital signal processor of the present invention determines a de-emphasis filter that de-emphasiss input data, a switch means that selects one of the input data and the output of the de-emphasis filter, and determines whether the input data is pre-emphasized. , If the pre-emphasis is discriminated, the switch means selects the output of the de-emphasis filter, and if the pre-emphasis is not discriminated, the switch means selects the input data. The output of the switch means is signal-processed.

[0006]

[Action]

 According to the digital signal processor of the present invention, when the input data is pre-emphasized data, the discrimination / control means discriminates to that effect, and the switching means determines the de-emphasis filter by the discrimination / control means. Output is selected. When the input data is not pre-emphasized, the discriminating / controlling means discriminates to that effect, and the switch means selects the input data under the control of the discriminating / controlling means. Therefore, if the pre-emphasized data and the non-pre-emphasized data having the same content are subjected to the same processing, the same output can be obtained.

[0007]

【Example】

 Hereinafter, the present invention will be described with reference to examples. FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. The input data is applied to the digital audio interface receiver 1. The digital audio interface receiver 1 is, for example, a digital audio interface receiver stipulated in the Japan Electronic Machinery Manufacturers Association Standard CP-340.

The digital audio interface receiver 1 converts the input data into data of a predetermined format and sends the data, and also determines whether the input data is pre-emphasized data or non-pre-emphasized data, and outputs a discrimination output. It is sent as a control signal.

The input data converted into a predetermined format by the digital audio interface receiver 1 is sent to the de-emphasis filter 4 and applied to one input terminal of the changeover switch circuit 6 to switch the output of the de-emphasis filter 4. It is applied to the other input terminal of the switch circuit 6.

On the other hand, the discriminant output from the interface receiver 1 is sent to the driver 2, and the output of the driver 2 drives the changeover switch circuit 6 to change over. The changeover switch circuit 6 is driven by the driver 2 according to the output which is determined that the input data to the digital audio interface receiver 1 is pre-emphasized data, that is, the other input terminal side of the changeover switch circuit 6, that is, the de-emphasis filter 4. Select the output side.

On the other hand, the driving of the changeover switch circuit 6 by the driver 2 is based on the output which is determined that the input data to the digital audio interface receiver 1 is not pre-emphasized data, that is, one input terminal side of the changeover switch circuit 6, that is, Selects the output side of the digital audio interface receiver 1. The output from the change-over switch circuit 6 is sent to the signal processing unit 5 to be subjected to signal processing and output.

In the present embodiment configured as described above, the input data is input to the digital audio interface receiver 1 and converted into data of a predetermined format, and the input data is decoded regardless of whether it is pre-emphasized or not. When output to the emphasis filter 4, it is determined whether or not pre-emphasis is performed, and the determination output is output to the driver 2.

The driver 2, which has received the determination output that the input data to the digital audio interface receiver 1 is pre-emphasized, switches the changeover switch circuit 6 to the output side of the de-emphasis filter 4. Therefore, in this case, since the input data is pre-emphasized, the output de-emphasized by the de-emphasis filter 4 is meaningful, and the de-emphasized data is processed by the signal processor 5.

The driver 2, which has received the determination output that the input data to the digital audio interface receiver 1 is not pre-emphasized, switches the changeover switch circuit 6 to the output side from the digital audio interface receiver 1. Therefore, in this case, since the input data is not pre-emphasized, the output from the de-emphasis filter 4 is meaningless, the output side from the digital audio interface receiver 1 is selected, and the digital audio interface receiver is selected. The output from 1 is processed by the signal processing unit 5.

Therefore, accurate signal processing can be performed regardless of the presence or absence of pre-emphasis of input data.

In the above embodiment, an example using the digital audio interface receiver 1 has been described. However, instead of the digital audio interface receiver 1, an A / D converter is used, and the input of the A / D converter is changed. If it is always pre-emphasized, the changeover switch can be omitted and the A / D conversion output must be de-emphasized.

[0017]

[Effect of the device]

 As described above, according to the present invention, the output of the de-emphasis filter and the input data are sent to the de-emphasis filter for de-emphasis of the input data, and based on the information as to whether the input data is pre-emphasized during signal processing. Since and are selected and signal processing is performed on the selected output, there is an effect that accurate signal processing can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

[Explanation of symbols]

 1 Digital Audio Interface Receiver 2 Driver 4 De-emphasis Filter 5 Signal Processor 6 Changeover Switch Circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Ueno 2-17-5 Shibuya, Shibuya-ku, Tokyo Ken Utsudo Co., Ltd. (72) Noriyuki Hayashi 2-17-5 Shibuya, Shibuya-ku, Tokyo Stockholders Company Ken Wood

Claims (1)

[Scope of utility model registration request] 1. A de-emphasis filter for de-emphasis of input data, and a switch means for selecting one of the input data and the output of the de-emphasis filter.
It judges whether the input data is pre-emphasized, and when it judges that it is pre-emphasized, it makes the switch means select the output of the de-emphasis filter, and when it judges that it is not pre-emphasized, it makes the switch means. A digital signal processor comprising: a discriminating / controlling means for selecting input data, and processing the output of the switching means.