JPS587918A - Encoding and decoding device - Google Patents

Abstract

PURPOSE:To reduce constitutional parts and improve reliability by constituting a titled device so that the constitutional parts can be widely used in common at the operation in both encoding and decoding modes. CONSTITUTION:Since an analog signal compressor AC and an analog signal expander AE are constituted by using common resistors R3-R5 and changeover switches S6, S7 for selecting the quantity of compression and expansion, the number of resistors and alteration switches can be reduced by half in comparison with an ordinary circuit and the number of highly accurate resistors for compression and expansion can be also reduced. Since the device is constituted by a small number of parts, the device is advantageous at the points of cost and spaces and can easily achieve the improvement of reliability of the circuit.

Description

[Detailed Description of the Invention] The present invention provides analog and digital HP, qIc
4↓G No. f hit, digital 1 g- No. τ analog 1-
No. K (ν encoding 17)
Regarding 01, when the device is used in encoding mode and when the wheel is used in decoding mode,
As a 4N configuration in which the device red Hakusei is shared with the human PC at the time of operation in both modes, there are few 1413 items in the structure 1, and it is a temporary one with a high price due to surface damage. Transformation? ,,1i
It was created with the aim of providing TVC that can provide 1R.

By switching between code mode and decoding mode,
Expansion from analog 1g x to dental layer II! (below 1
; , AI) conversion) and the operation of converting data from digital to analog No.
It has been proposed by Ol: U.S.41 that it be transmitted by the F code encoder g so that it can be shared (hereinafter referred to as the DA code), and also, N
Does the contrast decoding device d reduce the noise above?
As a purpose, if I put it on analog No. 16, I would like to use Tsumugi extension motion F.
It has been known for some time that the time-making model 1■1, which is a self-drawn circuit that performs the moon, has been known for some time.

Figure 1 shows the pressure, extension and ejection for the analog key number.
There are 77 examples of coding and signal converting devices that came to Japan.
＜This is a block diagram υ, In this 11 diagram, 1 is analog += ” human power 2 items, 2 is the output J terminal of analog 1g, DA change 1 rumor white of the DAO output book, OOM
P is IL comparison, ↓, 8AH) Read next comparison Instagram,
DB Gedeme selector, LCi is Funochi Kaisaba, Ding VO+
A
C is analog No. 15 pressure rice di% AE is analog No. 1 expansion device, LDI: i L/Hell Iq output device, R7 is U (anti, S8, 59ii 7-do changeover switch, SDmlJ
, Mode Kirihama

Figure 1 shows the R-time fJT No. 1ji kv tp7 that came with a toilet.
p (when the switch S8 is turned on and the switch 89 is turned on) the device is set to the code mode. Na;
At the same time, the digital input from DA to D8 is changed by switching the selector Dlj, and the output digital ( No. 11 will be given.

On the other hand, analog 1g from analog 16 manual shoulder-fi
In the level performance <4 Ll), -t
7''LVC supplied analog number 1 of human power is set to level director Ll). The analog 1d@'s e3@level QCIL is internally generated in the analog 1d@ level QCIL, which is supplied to the analog 1d@ level Kd signal generator AC, and the encoded signal is loaded via the line 6 (vh). IfmM of et al.
Output as Cheongju Ig.

+l'lJ M's dried sardine information + S is given to the analog signal LE return unit AO, input analog No. 16 supplied from human power terminal 1 is input to the input analog No. 16, and the signal level of the seventh L is level director LD. The royal power t'P supplied by
Output as changed by the first signal pressure signal E,
It is applied to the comparator ooup through the resistor R7i.

In the AD conversion operation mode, the successive approximation type D converter 1q path is such that the output current from the DA converter DAO is the direct voltage drop caused by the resistor R7, and the analog 1g voltage output from the analog signal compressor AOρ. The circuit part constructed by the comparator 00MP, the register B for successive approximation, the data selector DB%DA, the switch 88, etc. operates so that the register B for successive approximation becomes equal to
A digital output signal is sent from the AR via the data bar.

Furthermore, in the conventional child code encoding device shown in FIG.
Mode switching No. 1g is given to kA8, and the device changes to 4. I
On the first stage, I turned to switch S9.
is in the on state, and the switch 88 is in the off state. The digital key number is the latch circuit leg and the data selector D8.
The condition is such that a number is given. -Also, in this mode of operation, the device 14 vC is given the -C decompression information signal through the Iwao 6 connection, and the latch circuit is passed through the Iwao 6 connection. , via line 7, the analog II expansion string VC is supplied.

When the device is in the signal mode, a digital signal applied to the device via the data bus 5 passes through the latch circuit LO and data selector ps to the DA converter DA.
When DAf is inputted to O, the digital signal inputted thereto is converted into an analog signal lCf, pA, and an analog output '[blood is applied to the current-voltage converter IVOK via switch S9.

The output voltage from the current-voltage converter ■0 is outputted to the analog signal output shoulder 2 through the analog extender and the output of the analog 1d extender.
The expansion motion t'V, which is 16 times the expansion signal given through the analog signal 7, is subtracted from the analog signal.

In the encoding system 4-41 shown in FIG. 1, the circuit section for converting it into an analog signal is constructed as shown in FIG. 2, for example.

In Figure 2, the component parts corresponding to those of the circuit layout in the throat of Figure 1 are marked with the figure ll11 code used in Figure 1 and the figure 1Jl]R number of 1lff+-. .

In Figure 2, BAi, j buffer amplifier, A1%
A5, R7, R8 to R1g are resistors.

In FIG. 2, when the encoding IM encoding pupil is set to the encoding upper mode, the pressure is the mode selector switch 8 or on, and the mode OFF I! l! If the I switch S9 is turned off and the 4-7 position is still in the decoding mode, the mode changeover switch 198.89 is turned off.
As mentioned above, the off state ia+ is the opposite of the above-mentioned condition.

The analog signal pressure #11 AO and the analog 4G 1g expander Al11l are configured as the same circuit line by using a resistance reducer and a cut-off switch #Ag's, respectively. The analog No. 16 compressor AU and the analog No. 1 decompressor d shown in FIG. 2 are each constructed as a -1- circuit type No. 11.

Now, in the circuit section @VC shown in the second diagram, if the compression I and expansion type (a expansion 1) are set to 6 dB for analog No. 18, the resistors R9, RIO, RI4, and R15 are the resistors 1.
11, 1(9: k(+0=RI4: RxB=1
: All you have to do is leave the court like 1, 1, companding i to 12
11C in dB is the resistance value C of the valley resistor in lJ:
Hxo=H1<:1 (ss=6:1) The switching switches Slz and Sts are each connected to the drive circuit 8.
Drc.

8Dre allows one selector switch (e.g. S+
.

Alternatively, if 512) is in the off state, the four switches (for example, 8+1 or 513) are controlled on and off so that they are in the on state.

Then, as in AiJ, depending on whether the 10,000 ν month Q switch or the earth power uJ [switch is on or off], the analog compressor AG or the analogue key 7 diagnosis A or The l-E contraction amount or the 1-instep length amount in the ψ is changed.

By the way, the reconfiguration of the circuit R shown in Figures 1 and 2 is based on a circuit configuration in which the output current of the VcDA poor converter DAO flows through the mode selector switches 811 and 89 (4), so it has not been used for one history. When the output impedance of the reversing switch DAO is very unpopular, the mode selector switch 8B, E! 1. If you cause evil L on the table, it will cause distortion and cause damage to Shun. A small switch (flexible switch, electronic switch) is used for the first time, but this kind of thing
The device will give you a big disadvantage in the cost of the equipment and the cost of the equipment.

1fc, in the circuit layout shown in Figure 2, analog 1g
A compressor and an decompressor for the code are provided in Rangari, and when the device is used in the code ratio mode and when the device is used in the decoding mode, Only those with -h in the long organs are made into the state of insects υ1',
The other is in a state of inactivity, but the oppressor and the oppressor are friends! Since J and J are from the same paperback as mentioned in 11, the circuit I in Figure 2 is similar to K 1.
If two sets of circuits with a kll-configuration are provided, and only the -)y circuits are provided, and no ρ11 set is provided, there is a problem in that there is a lot of waste in the circuit configuration.

The present invention provides an encoding/decoding device 2 which is free from the above-mentioned problems in the encoding/decoding device for promoting fc by multilayering FIG. 1 and FIG. to,
The details of the shell-like sea lion of the N-formation W of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 6 shows one part of the encoding/decoding apparatus of the present invention.
Of yours! l! This is a part II force path diagram, which has already been described in Figures 1 and 6. 1'1 in the circuit layout of the 2nd diagram and the fi 4 Chengdu soup with the wick, the 1st
Drawing number 1 - Voice number 2 The drawing code used in the figure and 1rrl - drawing 4 + number 14 are included.

In Fig. 76, 1 is a manual terminal for the E analog signal, 2 is an output terminal for the analog signal, and DAC is a DA converter.

A first resistor network 1<B consisting of a series connection circuit of resistors 1 (3 to R6) is connected between the DAF Hou Q DAO solder flow output terminal and the output terminal 2 of the analog optimization. Terafu Ji, 17'c, VC between analog 1g's human power terminal 1 and analog signal output terminal 2. Series connection circuit of resistor R1 and resistor H2 h. A net hb is provided.

In addition, the terminal 9 of the DA converter DAO is connected to the converter 0014P via the mode selector switch 1.・2
IsV...mi(,,'4A!・1) 14 turn (tsuno l)
；→Children and grandchildren are written down.

・ul A+', A′2 of ・λmi! The non-inverting input terminal of iAz is grounded 7L-, and the second 1.-
The output terminal of the width switch A2 is connected to the connection point between the resistor R5 and the resistor R6. The inverting terminal of the amplifier A2 marked with h+s and the resistor R+ in the second resistor network RJ
Mode changeover switches S2, 83, and 84 are connected between the connection point of the resistor 1+2 and the resistor 1+2.

Among the mode changeover switches 81 to S5, the mode changeover switches 82, 84, and S5t'lj are in an on state when the device is in the 'R encoding mode, and in an off state when the device is in the decoding mode. Further, the mode changeover switches 81 and 83 are in a state where the VC is off when the device is in the encoding mode, and are in a trap-on state when the device is in the decoding mode.

Turn on the valley 7-domain selector switches S1 to S5 that were previously selected.

The OFF operation is performed by the drive circuit aI)+n of the mode changeover switch.
It is controlled by 1lI14.

The non-inverting input terminal of the amplifier A1 of 71 is in the positive mode, and its inverting input terminal is in the positive mode.
”, and its output terminal is connected to the output terminal 2 of analog No. 1g.

The mode changeover switch S2 and the mode changeover switch ss switch S7 are connected, and the drive circuit 91)r of the fC contact changeover switch described above is turned on by the VC.

Off operation or market control. Further, the operation of the drive circuit wrSDr is controlled by a signal given from the selection switching circuit 5ffb.

Now, when the device is operating in the encoding mode, the circuit layout shown in FIG. 6 will be covered by a circuit different from that shown in FIG. When operating in mode 2, the circuit is represented by a circuit as shown in FIG.

Comparing the circuit shown in Figure 4 and the circuit shown in Figure 22, 24
Resistance #jLRa in the figure corresponds to resistance +<7 in Figure 2, and resistance f(s, R4, Ra
In FIG. 2, the part consisting of the amplifier A2, switches 86, 87 & 2, etc. is connected to the analog signal consisting of the resistors [Rs~) (13, switches 810, 811 and the amplifier A4, etc. Corresponding to the compressor AO, roughly speaking, the resistors R1 and R2 in Figure 4 and the first amplifier All'
tllk corresponds to the buffer increase 11 private unit mix in FIG.

Also, when comparing the circuit shown in Figure 5 with the circuit at the bottom of Figure 2, the component consisting of the resistor R6 and the 3.2 amplifier A2 in Figure 5 is replaced by the amplifier A3 in Figure 1-2. On resistance (
8 and the pressure transformer I
The part corresponding to VO and constituted by the resistor ~H1, the switches S11, 87, and the first amplifier A1 in FIG. 5 is the resistor #jER14~R1δ in FIG.
This corresponds to the analog signal expander A, which is composed of switches 812 and 813, an amplifier AS, and the like.

Now, with reference to FIG. 4, which shows an equivalent circuit tl-ho when the encoding/decoding apparatus of the present invention is operating in encoding mode,
The output voltage of the first 41 intervals 5Al is Vin, and the second J
Let Vout be the output direct pressure of Soyōki A2, and resistor R:
Let the resistance value of l-1(s be R3-R5, and furthermore, to simplify the explanation, it is assumed that the human power impedance of the second 41-meter device A2 and the 1-arm width are both large and can be regarded as infinite. Then, the analog signal compressor AO in Figure 4
The pressure distribution gain GVi, G=剋 and (υ 1n) is given by the equation (1), but now that the switch S6 is on, -
≠ −1 If the gain in the state where 87 is off is Ga, then Ga −−−LL−・(21 & 10R
3 The gain Ga is given by Ic as shown in equation (2).

Also, the gain (+1
-Gl), the gain Gl) is expressed by the following equation (6).

Gl) = -1u Tamani, (6) 1 sentence 3 If the ratio between the gain Gl) and the gain aa mentioned above is Go,
G.

is given by the following equation (4).

Go = Gb == RI R4・R4+R1,
, <4) Ga R5-Rs So 1. Analog signal #1A shown in Figure 4
OK, for example, if you want to perform a 12 dB (4x) king@sf'F-, you should use a hatchet so that GO=4.
For example, when attempting to perform an EE compression operation of 6 dB (2 times), by selecting the resistance values R3 to Rsf of the resistors R8 to Rs so that Go=2, the required pressure kal
It is clear that an analog signal pressure device ml having ml can be easily constructed.

The change in the gain of the circuit and the ratio of the gains due to the switching of the switches 86 and 87, which are explained by referring to the analog single-signal power converter AO in Fig. J-4, are decoded by the encoding/decoding device of the present invention. The analog signal expansion 4 or more shown in the circuit when operating in this mode is also shown as being permanent, and the amount of expansion in the analog signal expansion 4 is also the same as that of the resistors R8-R5. By appropriately selecting the resistance values R3 to R5, they can be set to 19.

Next, an example of the resistance of resistors R3 to R5+1fiRs to R5 will be explained. Analog signal compressor AC and analog signal expander A in the encoding signal encoding device of the present invention
In the circuit with E, the resistance value R3 of the resistor R3 and the resistor R1
If the resistance values R5 of i and R5 are selected to be equal, no matter which of the switches S6 and S7 is turned on, the impedance driving the inverting input terminal of the amplifier connected to it will be the same. , 1illIll
Since this has the advantage that the circuit characteristics are not affected by the manual bias Vt current of the S unit or the leakage current of the switch, the resistance values of the resistors R3 and R5 are appropriately selected.
) ta = Ra = R..., for example, 12
A circuit that can perform 1iB companding? Considering the case of configuring, GO in this case is 4, so (
4) From the equation, the relationship R4=R can be obtained. That is,
Of course, if the resistance values R3 to R5 of the resistors R3 to R5 are all set to the same value R, it is possible to easily construct a compressor AO and an expander AO capable of performing 12 dBO companding. And resistors with the same resistance value are easily obtained,
The temperature coefficient is also easy to match, so it's easy to get low sushi! −
Using this, the LEM fist extension of Machitohi was obtained by Tani J4/
'L is going.

Towards the fruit of the present invention as shown in Figure 26, there is a connection between the DAV terminal DAO (D current output terminal 9 and the converter 00MP that turns on the VC in the encoding mode). Foreshadowing, 1
VC is off when in mode on M No. 1, is it a problem? The L mode switch is set to 85klt, but compared to <m OiJ
If the human power impedance of Ml' is too large for the light beam, switch s! + may be omitted and the present invention may be practiced by connecting the IlA @ di DAO acid (nt output power 9 comparison 600 MP) to Naoe.

It is a bottle, as shown in Figure 76.
The switching of the a extension and invasion is done in one stage, but in the middle of the present invention) as shown in Fig. 7I [,! Resistor network Kd of i
Compression/expansion can be achieved by providing switches Sx to 8Z between the connection point between each resistor am to Rss 41J- and the connection 10 for the individual resistors connected in series in the resistor circuit 11. It is also possible to make it possible to switch the warehouse to an S configuration.

In addition, in order to selectively input the number of analog first editions to the encoding/decoding device of the present invention, it is necessary to input the analog signal input ZM terminal 1 and the output terminal 2 of the alarm log signal. The circuit configuration of the part between the first 1=J1 and the inverting input terminal of the width switch A1 is as shown in Figure 7.
Just change it to 4 = Big Hunt for Chomei. In Figure A'7, la and In are the input terminals to which H is applied, and Rla
, t<za.

Ran, Rzn, etc. are additionally awned resistance, 84a,
S4n etc. kriu〃1)S7Lfc switch. Nafu, this 1-7 Figure 1c 7R manual signal switching circuit V (for reference to "rl-", please refer to the description in the specification of No. 55-41B66).

As is clear from the detailed explanation above, the encoding and compensation overlay of the present invention is described in detail below.
Since the I'l' and I'l' length devices are configured using common amplifiers and resistors, the number of amplifiers and I'l' length devices can be halved compared to conventional circuits, However, the number of resistors required is also small.

In this way, since the device of the present invention can be constructed with a smaller number of parts than the device 1 of the present invention, it is not only 4G-original in terms of cost and space, but it is also easy to improve the 1D conformity of the circuit and increase it by VC4 formation!
1 offset #4 is required, but in the device of the present invention, those glances at the same place are necessarily reduced t'ζ, so the present device reduces the cost of 1M construction and the ease of installation. But the advantages are clear.

The X current that replaces this is due to the manual power of the amplifier or comparator. (It is small enough to be selected, so it is not a problem at all. Therefore, the use of the above-mentioned switch parts becomes a problem. And, when these switches are in the on state, they are all used at the amplifier's imaginary short point VC. Since no voltage is applied, the switch drive I!21 path has the advantage of having a simple configuration.

? It is possible to use the encoding OI encoding method praised by Beneiju and others, and to provide it at a low cost.

[Brief explanation of drawings]

Figures A'1 and A.2 are block diagrams and circuit diagrams of conventional devices, Figure 26 is a circuit diagram of essential parts of an embodiment of the encoding/decoding apparatus of the present invention, and Figures 4 and 5 are The circuit diagrams of the device shown in Fig. 6 are also in different modes, and Figs. 1...Analog signal input terminal, 2...Analog signal output terminal, AO...Digital 11! No. 1 FE Silkware, Company...
・・Analog No. 1J expander, DAC/DA converter, O
OMP...Comparator, sAR,...Successive approximation register,
LO/latch IgI omitted, trouble...data selector,
IVO... Dentaki Kamide Henshoki, 811m do tJI Kyou X
Itsu 4, Bb, 87, S1o ~ Sla...-Pressure 341v group exchange X isona, h+ ~ RI8, Rla
, Rln, R2a, R211・44 K, 5
) Office lady and loser no chivalry kneels, Tachiki comes out, Japan Victor integrated type Yunoji konjin Masukonshi Tsubo Kaimuo 15 Procedural amendment (voluntary) July 3, 1988 Q + 1 41 Qi 1956 special request No. 105859 No. 2, Name of the invention Encoding/decoding device 3, Relationship with the person making the amendment (ill) Patent Applicant 4, Agent ``2.

Claims (1)

[Claims] 14 analog/digital f conversion operations in the encoding mode and the decoding mode, which are performed in accordance with mode switching by the vJ Hou circuit, respectively. Digital/analog ff of equipment in
i operation is performed by sharing the digital-analog 1 device of 111111, and
9. An encoding/encoding device configured to perform analog 16 compression/expansion operations in at least one of the two conversion operation modes, A first resistor circuit #I'IC in which at least four resistors are connected in direct tandem is provided between the analog current output terminal of the analog/digital f converter and the output terminal of the 84 analog signals; 24 resistors are connected directly between the analog signal output terminal of the device and the analog 1d input terminal of the device. 1"
The same VC between the connection point of the two resistors appearing in the network and the inverting input terminal of the first JW width converter, the VC is on in the encoding mode, and the VC is off in the decoding mode. In addition, a switching means is provided for νJ1.
As well as grounding the non-inverting input terminal of g1,
Its output terminal (connected to the output terminal of the analog signal of the device, and connected to the analog signal output terminal of the device) is the violet, the analog section of the digital/analog device? When the jump output terminal is connected via a switching means that is in the on state in the 4gf coding mode and in the off state in the dipping mode,
C. Valve the switching valve stage which is off in the encoding mode and on in the decoding mode, and connect the 72 stage 11 transmitter)
The non-inverting input terminal of the second amplifier of ad is connected to the connection point between the amplifier and the inverting input terminal of the J booster of -*7'c, mentioned above. The inverting input terminal and the inverting input terminal of the first amplifier of VC1 are the same as the inverting input terminal of the VC1 first amplifier. The inverting input of the 2nd amplifier is connected to the power supply terminal, and the on state is XS when the encoding mode is on, and the off state is when the +W mode is used.
In the first 14 resistor network, the switcher means made of 4 are connected to the output terminal of the 1d1 divider of AiJ M[: L-fcλ'1 and the output terminal of the amplifier of A-2
There is a connection between the 4 children and the 11th uncle)
LE Enemy 4's Secret Encryption and Decryption 44