te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>audio - GNU Octave stereo recording, how? - Stack Overflow

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    audio - GNU Octave stereo recording, how? - Stack Overflow

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    I'd like to use GNU Octave for signal processing; one channel would be the audio, the other would be a sync signal input.

    This is the default recorder object in Octave:

        BitsPerSample = 8
    CurrentSample = 0
    DeviceID = -1
    NumberOfChannels = 1
    Running = off
    SampleRate = 8000
    TotalSamples = 0
    Tag = 
    Type = audiorecorder
    UserData = [](0x0)

    The stream is mono, i.e. a one-dimensional vector.

    Tried the below code:

    recorder = audiorecorder();
set(recorder, 'SampleRate', 48000);
set(recorder, 'NumberOfChannels', 2);

    Getting this message for the NumberOfChannels property:

    error: @audiorecorder/set: no such property or the property specified is read-only

    I'd like to use GNU Octave for signal processing; one channel would be the audio, the other would be a sync signal input.

    This is the default recorder object in Octave:

        BitsPerSample = 8
    CurrentSample = 0
    DeviceID = -1
    NumberOfChannels = 1
    Running = off
    SampleRate = 8000
    TotalSamples = 0
    Tag = 
    Type = audiorecorder
    UserData = [](0x0)

    The stream is mono, i.e. a one-dimensional vector.

    Tried the below code:

    recorder = audiorecorder();
set(recorder, 'SampleRate', 48000);
set(recorder, 'NumberOfChannels', 2);

    Getting this message for the NumberOfChannels property:

    error: @audiorecorder/set: no such property or the property specified is read-only
    • audio
    • signal-processing
    • octave
    Share Improve this question edited 2 days ago Christoph Rackwitz 15.5k5 gold badges39 silver badges51 bronze badges asked 2 days ago szoftveresszoftveres 11 silver badge1 bronze badge New contributor szoftveres is a new contributor to this site. Take care in asking for clarification, commenting, and answering. Check out our Code of Conduct. 1
    • Comment from staging, you probably don't see it anymore: According to docs.octave./latest/Recorder-Properties.html you could try a properties = set (recorder) to see the configurable properties. Also, docs.octave./latest/Audio-Recorder.html suggests that you could set these particular parameters in the constructor. – tevemadar Commented yesterday
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    1 Answer 1

    Reset to default 1

    According to the source code, the set() function on audiorecorder objects does not support setting the number of channels.

    According to docs, you can pass those in the constructor.

    : recorder = audiorecorder ()
: recorder = audiorecorder (fs, nbits, nchannels)
: recorder = audiorecorder (fs, nbits, nchannels, id)

    So...

    recorder = audiorecorder(48000, 16, 2)

    (assuming you'd want 16 bits per sample, not 8)

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