CN1315819A

CN1315819A - Multi-channel mode common printed circuit board decoder for audio frequency

Info

Publication number: CN1315819A
Application number: CN 01109824
Authority: CN
Inventors: 斋藤祥治
Original assignee: Funai Electric Co Ltd
Current assignee: Funai Electric Co Ltd
Priority date: 2000-03-23
Filing date: 2001-03-20
Publication date: 2001-10-03
Anticipated expiration: 2021-03-20
Also published as: CN100418388C; JP3071959U

Abstract

In audio-decoder apparatus, a circuit substrate 12 common to a 2-channel model and a 5.1-channel model, on which a decoder 3 and a D/A converter 4 with built-in PLL are installed, and which has installing portions 5a and 6a for enabling installation of D/A converters without built-in PLL. The line connection modes of signal lines connecting the output terminal of the decoder 3 to the input terminals of each D/A converter can be changed by a switching apparatus 13, corresponding to the channel model, thus it becomes possible to realize D/A converters without built-in PLL having better audio performance under a line connection mode desired for an improved audio performance. Therefore, a good audio performance can be secured, while a common circuit substrate can be used for a variety of channel models, which is advantageous in view of fabrication cost.

Description

The decoder for audio frequency of multi-channel mode common printed circuit board

The present invention relates to a kind of decoder for audio frequency that audio signal behind the coding of playing is decoded in DVD player and DVD-ROM driver etc.

In the past, in this decoder for audio frequency, multi-channel modes (audio equipment device) such as 2 passages and 5.1 passages are arranged,, adopt the decoder that carries decoding Doby voice signal, the printed circuit board (PCB) (PCB) that audio frequency is used digital to analog converter (hereinafter referred to as the DA transducer) for each passage.

Fig. 4 (a) and (b) are 2 passages of the existing decoder for audio frequency of expression and the printed circuit board (PCB) 1,2 of each pattern of 5.1 passages (passage is represented with ch among the figure).With in the printed circuit board (PCB) 1, carry the DA transducer 4 (DAC) (anterior using) of mpeg decoder 3 and built-in PLL at 2 passages.At 5.1 passages with in the printed circuit board (PCB) 2, carry the DA transducer 4 (DAC) (anterior with) of mpeg decoder 3 and built-in PLL and the

DA transducer

5,6 of non-built-in PLL (around with, subwoofer center with).Mpeg decoder 3 and each

DA transducer

4,5,6 are connected by line 7.The audio amplifier of expression 2 channel audio patterns in Fig. 5 (a), the inscape of the audio amplifier of expression 5.1 channel audio patterns in Fig. 5 (b).

In existing like this formation, must make a plurality of printed circuit board (PCB)s, so its cost height.For this reason, be to reduce relevant cost, common board etc. in audio system, allow identical hardware be applicable to the scheme of various patterns be known to (for example, opening flat 11-180221 communique) referring to the spy.

But, even shared above-mentioned printed circuit board (PCB) at multi-channel modes such as 2 passages and 5.1 passages, because following former thereby can not simple realization.Promptly, on a circuit board, only need carry a DA transducer for 2 channel patterns, and need carry a plurality of each channel signal output DA transducer for 5.1 channel patterns, and in arbitrary pattern,, clocking needs built-in PLL for having 1 DA transducer at least.In 5.1 channel patterns, wish to adopt the low DA transducer that does not have built-in PLL (hereinafter referred to as the DA transducer of non-built-in PLL) of price in other DA transducers.

In addition, the audio performance excellence of the DA transducer of non-built-in PLL itself, again, audio performance depends primarily on the signal that the anterior audio amplifier in the decoding output is used.Therefore, the anterior audio amplifier of decoding output wishes to be connected with the DA transducer of non-built-in PLL with on the signal output part as far as possible.According to such situation, want common printed circuit board to work hard for multi-channel mode.

The present invention, the invention of having done at above-mentioned existing problem just, its purpose is to provide a kind of and is guaranteeing to allow multi-channel mode common printed circuit board become possibility under the situation of audio performance, and the also low decoder for audio frequency of cost.

In order to achieve the above object, in decoder for audio frequency with the coded sound signal decoding, on for the common printed circuit board (PCB) of the multi-channel mode of audio equipment, carry the decoder of decoded sound signal and the DA transducer of at least 1 built-in PLL, and can carry the DA transducer of non-built-in PLL, on the holding wire that input on the above-mentioned printed circuit board (PCB) and output decoder and each DA transducer is connected, be provided with switching device shifter corresponding to the connection status of channel pattern between can free switch line.

In the above-described configuration, for multi-channel mode, adopt the common printed circuit board (PCB) of the DA transducer that carries decoder and built-in PLL, for the many patterns of port number, carry the DA transducer of non-built-in PLL, in addition, corresponding to channel pattern, can switch the connection status between the holding wire that is connected with the input of the output of decoder and each DA transducer.Like this, carry the DA transducer of at least 1 necessary built-in PLL, can guarantee to allow the DA transducer of the good non-built-in PLL of audio performance be connected to the connection status of wishing to improve audio performance simultaneously.

In addition, in above-mentioned, multi-channel mode comprises 2 passages and 5.1 passages, 5.1 carry the DA transducer of 2 non-built-in PLL during channel pattern, the output of above-mentioned decoder has anterior using, around each signal output part of using and the subwoofer center is used, pass through the above-mentioned switching device shifter of operation corresponding to 2 passages and 5.1 passages, the front portion of above-mentioned decoder is connected with the DA transducer of above-mentioned built-in PLL with signal output part during 2 passages, 5.1 should be connected with the DA transducer of above-mentioned non-built-in PLL with signal output part the front portion during passage, and around with signal output part that the subwoofer center is used in the either party be connected with the DA transducer of above-mentioned built-in PLL, the opposing party is connected with the DA transducer of non-built-in PLL.

In the above-described configuration, in 2 passages and 5.1 passages, when seeking the circuit board sharing,, therefore can improve audio performance because it is anterior with signal output to adopt the DA transducer of non-built-in PLL to change.

In addition, in above-mentioned, by operating above-mentioned switching device shifter, can freely switch with above-mentioned decoder around with the DA transducer of the above-mentioned built-in PLL that is connected with output that the subwoofer center is used and the DA transducer of non-built-in PLL.Can select connection status arbitrarily like this.

Followingly just the embodiment that device of the present invention is specialized is illustrated with reference to accompanying drawing.

Pie graph when Fig. 1 uses according to 2 passages of the decoder for audio frequency of one embodiment of this invention for expression.

Pie graph when Fig. 2 uses according to 5.1 passages of the decoder for audio frequency of one embodiment of this invention for expression.

Fig. 3 is the pie graph of the decoding device of the expression connection state different with the line of Fig. 2.

Fig. 4 (a) is the pie graph of 2 passages of the existing decoder for audio frequency of expression.

Fig. 4 (b) is the pie graph of expression 4 passages.

Fig. 5 (a) is the audio amplifier inscape figure of the audio frequency of expression 2 passages.

Fig. 5 (b) is the audio amplifier inscape figure of the audio frequency of expression 5.1 passages.

With reference to Fig. 1, Fig. 2, it is illustrated respectively in the connection state of each pattern of 2 passages and 5.1 passages in the decoder for audio frequency.This decoding device is applicable to DVD (Digital Video Disc) player etc., decodes being recorded in the digital audio signal that DVD etc. goes up behind the compressed encoding, is transformed into analog signal.This decoding device, multi-channel mode for audio equipment, go up lift-launch to the mpeg decoder 3 of voice signal decoding and 4 (being called DAC) of DA (digital-to-analog) transducer of built-in PLL at common printed circuit board (PCB) 12 (PCB), and equipped section 5a, the 6a of the DA transducer that can carry non-built-in PLL are set.This equipped

section

5a, 6a are last not to carry DA transducer (2 passage times spent were represented in Fig. 1 dashed rectangle) when being used for 2 passages, and carries the DA transducer 5,6 (5.1 passage times spent were represented in Fig. 2 solid-line rectangle) of non-built-in PLL when being used for 5.1 passages.Frame of broken lines 11 in the circuit board is the employed parts of 2 channel patterns.

In 2 channel patterns of audio equipment, be connected with the left and right sides audio amplifier of front portion (anterior with), in 5.1 channel patterns, be connected with the audio amplifier at the left and right sides audio amplifier at the left and right sides audio amplifier of front portion (anterior with), rear portion (around with), center (center with) and subsonic audio amplifier (subwoofer with).In addition, in mpeg decoder 3 input be recorded among the DVD etc. with the given form coding of image, sound, the regenerated signal of compressed signal, with this signal decompress(ion), decoding.In addition, mpeg decoder 3, each

DA transducer

4,5,6 are IC chip formation.

On the printed circuit board (PCB) 12, between each

digital signal line

7a, 7b, 7c and 8a, 8b that the input with the output of decoder 3 and each DA transducer is connected, 8c, be provided with corresponding to channel pattern can free switch line between the switching device 13 (switching device shifter) of connection status.As this switching device 13, can use the chip-resistance and the wire jumper that are inserted between the line.In addition, even the change of the connection between a plurality of line as long as printed circuit board (PCB) 12 is multilayer circuit boards, just can be implemented easily.In addition, the line 7b of the middle in each

digital signal line

7a, 7b of decoder 3 herein, the 7c is as the signal output of front portion usefulness, and its both sides are for around with exporting with signal with the subwoofer center.

Like this, in 2 channel patterns (Fig. 1), switching by switching device 13, allow the front portion of decoder 3 be connected with the line 8a of the DA transducer 4 (it is used for anterior) of built-in PLL with holding wire 7b, in addition, in 5.1 channel patterns (Fig. 2), switching by switching device 13, allow the front portion of decoder 3 be connected with the line 8b of the DA transducer 5 (it is used for anterior) of non-built-in PLL with holding wire 7b, and, around being connected with the line 8a of the DA transducer 4 of built-in PLL with holding wire 7a, the subwoofer center is connected with the line 8c of the DA transducer 6 of non-built-in PLL with holding wire 7c.In addition, around with holding wire 7a and subwoofer center holding wire 7c, by the switching of switching device 13, can select arbitrarily and

line

8a, 8c between connection state, also above-mentioned illustrated state can be exchanged connection mutually.Formation after its exchange connects as shown in Figure 3.

Can change the formation that is connected corresponding to 2 passages with 5.1 passages like that according to above-mentioned, seek the sharing of the printed circuit board (PCB) 12 of multi-channel mode, and carry the DA transducer 4 of at least 1 necessary built-in PLL, and in 5.1 passages, connect by changing, allow the DA transducer 5 of the good non-built-in PLL of audio performance export with signal, compare with existing formation and can improve audio performance as anterior.In 2 channel patterns, obviously do not need to carry the

DA transducer

5,6 of unnecessary non-built-in PLL.

In addition, the present invention is not limited to the formation of above-mentioned embodiment, can carry out various distortion, for example, though what adopt in above-mentioned is the necessary DA transducer 4 for the built-in PLL that produces clock of signal processing in the DVD player, but be not limited to PLL, also can adopt DA transducer with clock generating function.In addition, though what adopt as decoder is mpeg decoder, also be not limited thereto.

Claims

1, a kind of decoder for audio frequency is used in the decoder for audio frequency with the coded sound signal decoding,

It is characterized in that on, carry the decoder of decoded sound signal and the DA transducer of at least 1 built-in PLL, and can carry the DA transducer of non-built-in PLL with respect to the common printed circuit board (PCB) of the multi-channel mode of audio equipment,

On the holding wire that input on the described printed circuit board (PCB) and output decoder and each DA transducer is connected, be provided with switching device shifter corresponding to the connection status of channel pattern between can free switch line.

2, decoder for audio frequency as claimed in claim 1 is characterized in that described switching device shifter is to insert in chip-resistance between the line and the wire jumper any.

3, decoder for audio frequency as claimed in claim 1 is characterized in that being applicable to any in DVD player and the DVD-ROM driver, and described decoder is a mpeg decoder.

4, decoder for audio frequency as claimed in claim 1 is characterized in that apparatus has the DA transducer of clock generating function to substitute the DA transducer of built-in PLL.

5, decoder for audio frequency as claimed in claim 1 is characterized in that described printed circuit board (PCB) is a multilayer circuit board.

6, a kind of decoder for audio frequency is in the decoder for audio frequency with the coded sound signal decoding,

On the holding wire that input on the described printed circuit board (PCB) and output decoder and each DA transducer is connected, be provided with switching device shifter corresponding to the connection status of channel pattern between can free switch line,

Described multi-channel mode comprises 2 channel patterns and 5.1 channel patterns, does not carry the DA transducer of non-built-in PLL during 2 channel patterns, carries the DA transducer of 2 non-built-in PLL during 5.1 passages,

The output of described decoder have anterior with, around with and each signal output part of subwoofer center,

Corresponding to 2 passages and 5.1 passages, by the described switching device shifter of operation, the front portion of described decoder is connected with the DA transducer of described built-in PLL with signal output part during 2 passages, 5.1 should be connected with the DA transducer of described non-built-in PLL with signal output part the front portion during passage, and around with each signal output part that the subwoofer center is used in the either party be connected with the DA transducer of described built-in PLL, the opposing party is connected with the DA transducer of non-built-in PLL.

7, decoder for audio frequency as claimed in claim 6 is characterized in that described switching device shifter is to insert in chip-resistance between the line and the wire jumper any.

8, decoder for audio frequency as claimed in claim 6 is characterized in that being applicable to any in DVD player and the DVD-ROM driver, and described decoder is a mpeg decoder.

9, decoder for audio frequency as claimed in claim 6 is characterized in that apparatus has the DA transducer of clock generating function to substitute the DA transducer of built-in PLL.

10, decoder for audio frequency as claimed in claim 6 is characterized in that described printed circuit board (PCB) is a multilayer circuit board.

11, decoder for audio frequency as claimed in claim 6, it is characterized in that by operating described switching device shifter, can freely switch with described decoder around with the DA transducer of the described built-in PLL that is connected with output that the subwoofer center is used and the DA transducer of non-built-in PLL.

12, adopt the audio devices of the described decoder for audio frequency of claim 1.