Download MART-02:

MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
MART-02:
GENERAL PURPOSE MODULE TO RECORD
AND TO PLAY-BACK AUDIO MESSAGES
Assemble-it-yourself kit
1
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
The MART-02 Module is applicable for multiple recording and playing back audio signals
using non-volatile analog memories, types ISD1416 or ISD1420, made by Winbond Electronics
Corporation America (WECA). They feature high quality of sound recording, simple design and
long storage time without power supply (as much as 100 years). Integrated circuits applied, like
most of ISD devices, enable easy way to create various functions without any additional control
circuits. These functions including, but not limited to the following:
• ADDRESSABLE RECORDING OF MESSAGES,
• ADDRESSABLE LEVEL-ACTIVATED PLAYBACK OF MESSAGES,
• ADDRESSABLE EDGE-ACTIVATED PLAYBACK OF MESSAGES,
• OPERATIONAL MODES (ADDRESSLESS) which enable:
o
message looping (continuous playback),
o
consecutive record with message separation method,
o
consecutive record with message linking method,
o
message cueing .
Figure 1 below illustrates a circuit diagram of the MART-02 Module including external components
which need to be connected to create the device of its full functionality.
LED
R3 47k
U1
1
2
3
4
5
6
9
10
P5
P6
P16
P7
P17
P8
P18
P9
P3
R4 -R11
8x47k
9
8
7
6
5
4
3
2
R2 47k
C1
1nF
R1 47k
1
P1
A0
A1
A2
A3
A4
A5
A6
A7
VCCD
VCCA
VSSD
VSSA
ISD1416
ISD1420
SP+
SP-
23
PLAYBACK2
P14
24
RECORD
P12
27
26
PLAYL
ANAOUT
RECLED
PLAYE
MICREF
REC
XCLK
MIC
AGC
+
R15
1k
4,5 - 5,5V
P19
P10
14
15
P20
C6
Speaker
16 Ω
20
220uF
21
25
18
17
19
R14
470k
P2
R18
1k
C7
100nF
C2 100nF
ANAIN
PLAYBACK1
P15
28
16
12
13
R13 5,1k
P11
C4 100nF
C3
4,7uF
R16
10k
C5
100nF
P13
Signal from
external
source
Electret
microphone
R17
10k
P4
MART-02
Fig.1. Circuit diagram of MART-02 Module.
2
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
The kit includes integrated circuit ISD14xx and PC board (without other electronic devices). PC
board component layout is shown in Fig.2.
Fig.2. Component layout on PC board of MART-02 (Scale 2:1).
All applicable control and audio signals are connected to soldering points P1÷P20 located in two
rows and spaced each other by 0.1” (2.54 mm), enable to solder of 20-pin double-row connector or
a wire harness. Microphone leads shall be shielded and as short as possible.
PORTS OF MART-02 MODULE
All address signals, A0 through A7, and control signals, PLAYE, PLAYL, REC, RECLED and XCLK
of ISD devices are of digital nature and may take one of two possible levels: L* or H*.
__________________
* Voltage of L-level (shortly: L level) means, in case of ISD devices, the voltage of 0÷0.8 V with respect to
ground.
Voltage of H-level (shortly: H level) means, in case of ISD devices, the voltage of 2.4V÷Vcc with respect to
ground, where Vcc – the supply voltage.
Hereinafter, an alternative notation will be used for specific address or control signal (input/output): signal
name = L, signal name = H.
3
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
P1
-
power supply +4.5 ÷ +5.5 V
P2
-
input of external clock signal XCLK. Refer to ISD Data Sheets as to how use this
signal. If not used, connect this input to electrical ground.
P3
-
output to external LED to indicate recording (optionally). This output is
controlled by signal at RECLED pin of ISD device. During recording (REC = L), LED
is on. During playback, RECLED is at first high and when the end of message
(EOM) mark is detected, this signal goes low for the period of 12.5 or 15.6 ms.
P4
-
microphone input (-)
P5
-
address input A0
P6
-
address input A1
P7
-
address input A3
P8
-
address input A5
P9
-
address input A7
P10
-
speaker output (+)
P11
-
input for signal to record from external source
P12
-
input for REC signal, triggering level-activated recording (recording is started with
HL edge and lasts as long as this input is kept low)
P13
-
microphone input (+)
P14
-
input
for
PLAYE
signal,
triggering
edge-activated
playback
of
recorded
message (full message is played back by applying a short low pulse;
playback is activated by HL edge)
P15
-
input
for
PLAYL
signal,
triggering
level-activated
playback
of
recorded
message (playback is activated by HL edge and lasts as long as this
input is low)
P16
-
address input A2
P17
-
address input A4
P18
-
address input A6
P19
-
power supply (-) - electric ground
P20
-
speaker output (-)
Note that audio signals at both speaker outputs are at DC voltage of about 1.5 V and are phase
shifted each other by 180o.
WARNING: Connection of speaker outputs (P10 and P20) both with each other and with
electric ground may cause damage to the integrated circuit.
4
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
DESCRIPTION OF OPERATION
A basic operating mode of the Module is the address mode which enables to record and to
playback many independent audio signals of maximum total duration and frequency band of:
(i) 16 s and 0.15÷3.4 kHz for ISD1416, or (ii) 20 s and 0.15÷2.7 kHz for ISD1420, in successive
cells of analog memory, divided into 160 addressable rows (identical number of rows in both ICs).
This means that maximum 160 independent messages may be recorded, each of duration
time 0.1 s or 0.125 s for ISD1416 or ISD1420, respectively. Actual number of messages and
their duration depend on address selection within the memory address space. Addressing is made
with a binary coding at eight (8) address inputs A0 ÷ A7 to the rule specified in Table 1 below.
Binary digit 0 is equivalent to the L-level voltage while binary digit 1 – to H-level voltage.
Note that an address being specified always points out a memory row wherefrom specific
operation is started. Further internal addressing of successive memory cells is made without any
involvement of the user, via a so called Message Start Pointer (MSP), which is inaccessible from
outside. At the start of write/read cycle the MSP pointer is set to the initial value corresponding to
the specified address. Longer messages will be automatically loaded into successive memory
rows, as necessary, until the process is completed or memory end is reached.
Operation may also run without addressing (so called Operational Modes) where the initial
address is always equivalent to the beginning of the system memory (00000000). In these modes
the states at address inputs are not treat as address, but specify the type of the function being
realized. These functions affect then internal addressing within the memory. The system is
switched over into operational modes by providing H-level voltage to A6 and A7 address inputs
(P18 and P9 ports). Individual modes are activated by applying H-level signals to specific address
inputs as specified below:
A0 = H - message cueing (for playback only),
A1 = H - deleting internal end-of-message (EOM) markers (for record only),
A3 = H - message looping during playback,
A4 = H - consecutive addressing; retaining current value of MSP when starting specific
operation.
5
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
Table 1
Digital number
of memory row
A7
A6
A5
A4
A3
A2
A1
A0
0
1
2
...
8
...
16
...
32
...
64
...
128
...
158
159
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
1
Start time of
operation for
ISD1416 [s]
Start time of
operation for
ISD1420 [s]
0,000
0,100
0,200
...
0,800
...
1,600
...
3,200
...
6,400
...
12,800
...
15,800
15,900
0,000
0,125
0,250
...
1,000
...
2,000
...
4,000
...
8,000
...
16,000
...
19,750
19,875
Combinations of operational modes may also be used to effect various functions of the module.
All address and control inputs on PC board are biased at the H-level. These inputs may be
driven to L-level by applying external signal at L-level, e.g. by connecting to electric ground (current
consumption at these inputs may be neglected).
At the end of a record or playback cycle, the module automatically enters the power down
mode, where current drawn from power supply is greatly reduced (it depends on the states of
address and control inputs). The integrated circuit itself, ISD1416 or ISD1420, consumes typically
as low as c. 0.5 µA in this mode.
Before starting with recording and playing back, external components shall be connected to the
ports P1÷P20 as shown in Fig.1. These are as follows:
- power supply unit (battery, power pack);
- electret microphone providing signal voltage c. 20 mVpp;
- speaker, 16 Ω;
- LED (operating current of c. 7 mA);
- push-buttons referred to in the diagram as PLAYBACK1, PLAYBACK2 and RECORD.
The diagram does not provide all possible means for controlling ISD14xx devices. In particular,
record or playback may be initiated by means of external control signals of specified levels (instead
of push-buttons). Furthermore, signals from speaker outputs may be applied to audio amplifier
input so as to get higher output power.
6
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
ADDRESSABLE RECORD OF MESSAGES**
This function enables to record independent messages under various addresses. The total
recording time must not exceed 16 s for ISD1416 or 20 s for ISD1420.
• Apply address as per Table 1 to the address input A0 to A7 (record shall start from the
memory row of this address).
• Initiate record by applying L-level voltage to the REC input (port P12), e.g. connect P12 with
electric ground by means of RECORD push-button.
• Record message using microphone connected to ports P13 and P4. Record is initiated with
HL edge of REC signal and lasts until the end of L-level of this signal (LH edge). At the
same time, the end of record is marked out with an internal marker EOM, which is used for
play-back. Record terminates also when end of the memory is reached.
• Apply successive address to the address inputs to record the next message and repeat the
operation. Pay attention for the messages do not overlap one another within the address
space of the system as it will cause disturbances during playback (overlapped messages
will be seen as the single message and the message recorded later on will cancel the
previous one within their common portion).
• Record is indicated by LED, connected to port P3, which is switched on for this operation.
• Also an audio signal applied to ANA IN input (port P11) from external source, e.g. tape
recorder, tuner, generator, sound card of computer, etc can be recorded. The microphone
circuit may be then omitted. Record has priority over playback, i.e. record initiated during
playback causes playback interruption and record the message at this address.
_______________
** Observe the order of specified actions. Especially, the address line voltages shall be stabilised before
the signals are applied to the control inputs PLAYL, PLAYE and REC.
7
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
LEVEL-ACTIVATED ADDRESSABLE PLAYBACK OF MESSAGES
There are two methods which enable to playback independent messages stored at various
addresses. These can be achived by following way:
• Apply address of the message start to address inputs A0 to A7 (playback shall start from
the memory row of specified address).
• Initiate playback operation by applying L-level voltage to the input PLAYL (port P15), e.g. by
connect P15 with electric ground by means of push-button PLAYBACK1. Playback is
continued as long as the L-level is kept at this input; and is terminated when the H-level is
returned (LH edge) or when end of message or end of memory is reached.
EDGE-ACTIVATED ADDRESSABLE OF MESSAGES
• Apply message address to address inputs.
• Initiate playback operation by applying, to the input PLAYE (port 14), the triggering pulse of
L-level and duration shorter than the time of message to be playback, however not shorter
than 300 ns (e.g. temporarily connect P14 with electric ground with the push-button
PLAYBACK2). This operation is initiated by HL edge of the pulse. The message is played
back in full, i.e. until the EOM marker is encountered.
OPERATIONAL MODES (ADDRESSLESS)
1. Message looping
This mode enables continuous playing back a single message recorded from the beginning of
memory.
• Apply L-level voltage to all address inputs.
• Record one message of total duration up to 16 s (ISD 1416) or 20 s (ISD1420) as outlined
above.
• Apply H-level voltage to address inputs A6 and A7, which causes the system to be
switched over to operational modes.
• Apply H-level voltage to address input A3.
• Start playback operation by level-activated method (PLAYBACK1) or edge-activated
method (PLAYBACK1) as outlined above (while keeping the state of address lines
unchanged). The message will be repeated: until H-level is re-established at the input
PLAYL – for the former case, or until disconnecting the power supply of the system – for
the latter case.
8
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
2. Consecutive recording
This mode enables to record many messages one after another with no need to address each
of them. There are two methods of such record as outlined below.
Consecutive record by message linking method
Messages are recorded consecutively from the beginning of memory; they compose an entirety
which, when playback, is treated as a single record.
• Apply H-level voltage to address inputs A1, A4, A6 and A7; the remaining address inputs
to be at L-level voltage.
• Record the first message by applying L-level voltage to the input REC. Terminate the
record by returning H-level voltage at this input.
• While keeping the state of address inputs, use the same method to record the second
message and possibly the successive ones.
Consecutive record by message separating method
Messages are recorded one after the other from the beginning of memory, each successive
message having been recorded immediately after the previous one. Messages are independent
each other which, in effect, is similar to the addressable record, but in this case the addresses of
individual messages are unknown. During playback the messages are not linked.
• Apply H-level voltage to the address inputs A4, A6 and A7 and L-level voltage to the
remaining address inputs.
• Record consecutive messages as outlined above.
3. Playing back messages which were recorded consecutively
Method I – normal playback
With this method, the pointer MSP is cleared which causes that each new playback operation
commences from the memory beginning.
a) signal level activation
• Apply H-level voltage to address inputs A6 and A7 and L-level voltage to the remaining
address inputs.
• Start playback by applying L-level voltage to the input PLAYL. In case of messages
recorded with linking method, consecutive messages will be read one after the other as the
integral unit as long as the input PLAYL is low or until the end of the last message or the
end of memory. In case of messages recorded with separating method, just the first
9
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
message will be played back like for the addressable level-activated playback for the
message with the address of 00000000.
b) signal edge activation
• Bias the inputs as in previous case.
• Start playback by applying the trigger pulse to the input PLAYE. In case of messages
recorded with linking method, they all will be played back one after the other as a single
message. In case of messages recorded with separating method, just the first message will
be played back like for the addressable edge-activated playback for the message with the
address of 00000000.
Method II – consecutive playback
With this playing back mode, there is no clearing of the message pointer MSP, so it is possible
to memorise current location in memory and to playback its full content.
a) signal level activation
• Apply H-level voltage to the address inputs A4, A6 and A7 and L-level voltage to the
remaining address inputs.
• Start playback by applying L-level voltage to the input PLAYL. Consecutive messages
having been recorded with linking method will be played back as an integral unit as long
as the input is low or until end of the last message, or end of memory. If playback is
stopped and then restarted, playing back will be continued from the point of stoppage. In
case of messages having been recorded with separating method, playing back will start
from the first message and will be continued until the input PLAYL becomes high or until
the end of message. When restarted, playing back will be continued from the point of
stoppage until the end of current message or until the point of next stoppage. When
repeating this operation, we can play back all messages while we do not know their
addresses.
b) signal edge activation
• Bias the inputs as in previous case.
• Start playback by applying the trigger pulse to the input PLAYE. In case of messages
recorded with linking method, they all will be played back one after the other as a single
message. In case of messages recorded with separating method, each consecutive
trigger pulse will cause that consecutive message will be played back in full. When
repeating this operation, we can play back all messages while we do not know their
addresses.
10
mart02.pdf
MART-02 MODULE
PDW MARTHEL S.C. ul. Sosnowa 24-5, Bielany Wrocławskie
55-040 Kobierzyce, POLAND
tel. +48 71 3110711, 12; fax. +48 71 3110713
If the Method II is used and we reach the end of memory, the playing back will be stopped and
the device is no longer responsive to successive activation. This is because the message pointer
MSP has not been cleared so there is no way to go to the beginning of the memory. This status
may be left out by momentary disconnecting the power supply or by returning L-level at the
address input A4 (switching to the Method I) and restarting the playback.
4. Message cueing
This function enables to find out any message (among others being recorded with addressing
method or with consecutive recording with message separating) without specifying its address. To
use this function we need to know the successive number of the message being searched for.
• Apply H-level voltage to address inputs A0, A4, A6 and A7
• Apply shifting pulses, each at L-level and of duration 300 ns ÷ 10 µs to the control input
PLAYE; each such pulse causes a “jump” forward to the next message (with no playing it
back) and an indication of the next message.
• Apply L-level voltage to the input A0 (termination of cueing process).
•
Playback the message pointed out by applying the L-level trigger pulse to the input
PLAYE. Consecutive activating pulses will cause successive messages to be playback,
while repeated activation of cueing function (by applying H-level to the input A0) will
cause the process outlined above to be started from the end of the last message being
played back.
BASIC TECHNICAL DATA OF MART-02 MODULE
• Power supply: +4.5 ÷ 5.5 V.
• Recording time: 16 s (for ISD1416) or 20 s (for ISD1420).
• Message retention: 100 years – non-volatile message storage without power supply.
• Maximum frequency of recorded signal: 3.4 kHz (for ISD1416) and 2.7 kHz (for ISD1420).
• Acoustic power: 12 mW at speaker resistance of 16 Ω.
• Recording signal voltage from external source: max. 50 mVpp.
• Microphone inputs adapted to connect any electret microphone providing output signal max.
20 mVpp.
The MART-02 Module enables also many other functions which are derivatives of those
outlined above. It is up to user’s invention how they will be exercised.
11
mart02.pdf